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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">OK pour a fresh cup of coffee everyone…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Some of this is a continuation & update on the thread hooked in from last year, so I’m opting to more comprehensively addressing the issues in lieu of a more focused response.
Apologies for length, but I am hoping a few others find this worthwhile.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Following is a diagram that reflects my present understanding of actual zonal/system air stream relationships in doe2/eQUEST models. It’s probably still wrong somewhere (and
I know the doe2 reference entries contradict in a spot or two) but I believe it’s accurate for the topics under active discussion. I advise printing this off to sketch on for some of the examples to follow along (a few copies wouldn’t hurt for future reference):<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><img width="562" height="456" style="width:5.8541in;height:4.75in" id="_x0000_i1039" src="cid:image012.png@01D2A21F.4C325AA0"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Bill’s query is really complex and has a few layers I am guessing are easy to miss, so I’m going to deconstruct and build on a few issues in isolation. I will eventually conclude
with some constructive advice (promise!). <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Issue #1: Getting a grip on exfiltration in eQUEST (this is something we really should lock down first)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The specified situation is:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 23,000 Supply Air (100% OA)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,000 Zonal Exhaust<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 13,000 Return Air<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">(Assume no infiltration for the example)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">How much exfiltration is happening (I’m providing a hint with the +/- signs)? Adding these up from the zones’ perspective: The CFM available for exfiltration occurring in
this design scenario is <u>zero</u>. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Let’s presume your mechanical designer wants to design some degree of pressurization with all building openings closed, and so intends 2,300 CFM of exfiltration @ full flows
(10% of Supply). In the previous example we have no supply air available to exfiltrate, so to account for this we must reduce the operating return airflow by that quantity.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Adjusted setup is:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 23,000 OA / SA<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,000 ZE<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,700 RA<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">(Assuming no infiltration)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The net effects here are
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">2,300 of the supplied air into the zones exfiltrates from the building due to fan pressurization.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The ERV
<u>does not see</u> that exfiltrated air, so you can only recover heat from (at most): 10,700 + 10,000 CFM = 20,700 CFM.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">An aside:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> the doe2 reference entries suggest you can
<u>only</u> achieve exfiltration either by RETURN-CAP-RATIO or by specifying duct losses. You can more simply specify a return CFM less than the supply CFM directly. Return airflow inputs take precedence over return capacity ratio inputs in any case.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Another sidebar:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> About that ERV Summary report…<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><img width="478" height="149" style="width:4.9791in;height:1.552in" id="_x0000_i1038" src="cid:image013.png@01D2A23A.388AD070"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The “exhaust” and other air flows reported at the top of the ERV Summary SIM report are regurgitations of the corresponding inputs for “design” ERV airflows. Those
inputs are ONLY used to indirectly determine ERV fan/wheel power (when you don’t tell it the answer more directly with the kW inputs), and they do not reflect actual ERV airstream rates.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">AFAIK you
<u>have</u> to create a custom hourly report including “ERV Outdoor airflow (CFM)” and “ERV Exhaust airflow (CFM)” for the system to observe the behaviors I’m claiming above. Here are the variables I have noted for generally evaluating system Airflows:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><img width="528" height="381" style="width:5.5in;height:3.9687in" id="Picture_x0020_3" src="cid:image011.png@01D2A178.8CB02FF0" alt="cid:image011.png@01D2A178.8CB02FF0"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">… and here’s what that looks like in an INP file, for a system named “AHU1.” You can copy/paste this into the last section of your INP and it’ll work so long as
you change the second line to name a system actually in your model (you’ll probably want to rename the report block while you’re at it).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas">"Assess Airflows Block - AHU1" = REPORT-BLOCK
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> VARIABLE-TYPE = "AHU1"<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> VARIABLE-LIST = ( 17, 20, 21, 22, 292, 293, 222 )<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> ..<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas">"Exfiltration Report" = HOURLY-REPORT
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> REPORT-SCHEDULE = "Hourly Report Schedule"<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> REPORT-BLOCK = ( "Assess Airflows Block - AHU1" )<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.75in"><span style="font-size:11.0pt;font-family:Consolas"> ..<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The rest of the ERV Summary report is relatively useful / intuitive:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level2 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The middle of the report is great for quantifying net annual ERV effects (short of a parametric run to isolate the energy impact by end-use breakdown), and also visualizing
when & why you may be seeing counter-productive (“excess”) heat recovery and pre-conditioning<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.25in;text-indent:-.25in;mso-list:l0 level2 lfo8">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The very bottom of the report (2<sup>nd</sup> page) gives a more detailed accounting of how often freezing/condensing conditions are occurring with the ERV equipment,
which paints a little more informative picture than associated ATTN messages for when your model is advising you to address that in design.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Issue #2: “My zonal exhaust shouldn’t get seen by ERV equipment!”<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">If your zonal EXHAUST-SOURCE is “Air Handler</span></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">,” Zonal Exhaust quantities
<u>cannot</u> be directed “around” the ERV (that is, pushed directly to the exterior as some related doe2 reference entries suggest). Zonal exhaust joins the relief airstream and will be seen at the ERV when ERV is included for the system.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">If you instead choose either “Infiltration” or “Balanced Infiltration” for EXHAUST-SOURCE, the zonal exhaust stream is totally divorced from the central system & ERV equipment,
and goes straight outside.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I totally agree. A toggle/checkbox next to the zonal EXHAUST-SOURCE would be a really nice feature. Something like “this exhaust goes straight outside” vs. “this exhaust
is seen at parent system energy recovery equipment.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">For clarity:
<u>None</u> of the zonal AIRFLOW-TRACKING options prevent Zonal Exhaust from reaching the ERV… but we’re circle back to that issue later.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Solution #2a: “So what about David’s suggestion?”<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">David’s advice to turn zonal exhaust into exfiltration (doe2 terms) is a
<u>great idea</u> under a few conditions:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l4 level1 lfo7"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I need to choose zonal EXHAUST-SOURCE = “Air Handler”<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l4 level1 lfo7"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I can select zonal AIRFLOW-TRACKING = NONE or TRACK-EXHAUST<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Fully addressing the “why:”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Returning to the round numbers in the starting example, what happens if we force return to zero (i.e. don’t enter a return airflow and specify RETURN-CAP-RATIO as 0.0?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Recap for those keeping score:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 23,000 Supply Air (100% OA)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,000 Zonal Exhaust<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">0 Return Air (don’t specify a return airflow & specify RETURN-CAP-RATIO = 0.0)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">(Still locking out infiltration for the example)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Results:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 23,000 Supply<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,000 ERV Exhaust
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 13,000 Exfiltration (great! As expected.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Say you instead wanted 13,000 CFM seen at the ERV and only 10,000 CFM of zonal exhaust to be excluded from ERV. Simply specify a smaller amount of return:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> + 23,000 Supply Air (100% OA)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> - 10,000 Zonal Exhaust<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> + 3,000 Return Air<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Results:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 23,000 Supply<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">+ 3,000 Return<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 13,000 ERV Exhaust (10,000 Zonal Exhaust + 3,000 Return Air)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">- 10,000 Exfiltration
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Notice for each of these cases, the results from the zones’ perspective are a zero sum, so long as we don’t bring infiltration into the party.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Special considerations for this approach:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo6"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Return fan energies are no longer easily accounted for with the usual inputs, because the return fan isn’t engaged for exfiltration quantities<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">A relatively simple solution: add RA fan power to the supply fan’s kW/CFM input<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Acknowledging: a little fan heat contribution is shifted around in doing so (from the return air stream to the supply air stream), but in the macro level I expect
this is an acceptably minor concession for most projects. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo6"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Might not be a problem per se, but Zonal Exhaust fan energy merits a little extra attention:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">SV-A reports match your zonal inputs for exhaust CFM quantities (10,000 CFM in the above 2 examples)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Custom hourly reports however go a little bonkers: zonal exhaust bumps up to 23,000 / 20,000 respectively (appears to be a sum of zonal exhaust + exfiltration).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo6">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Resulting zonal exhaust power doesn’t shift with these edits in the SV-A reports, but may merit further investigation to confirm zonal exhaust power is accurate if
you’re going down this path.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Solution(s) #2b: “… but I gotta have TRACK-SUPPLY or TRACK-BOTH!”<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">David’s suggestion works until you specify exhaust tracking supply or exhaust/supply tracking each other (“both”).
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Either tracking selection results in zonal exhaust that will bump upward (to 23,000 in the prior examples) to match the supply airstream. This removes all potential at all
hours for exfiltration. This by extension means all exhaust will pass through the ERV equipment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">3 parting thoughts:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Bill’s proposal in his original query isn’t that crazy… (or at least it’s crazy in a good way!):
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Assume the conditions of the zonal exhaust airstream and the conditions of the “central” return airstream are effectively the same
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Derate the efficiency of the ERV so that it returns an amount of heat transfer commensurate with a reduced ERV exhaust airflow, as you anticipate.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Share those “derate curve” coefficients with your friends on the lists once you’ve worked it into an expression (please!)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> [Speculative territory]
</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">You <u>
might</u> alternatively sidestep the above limitations with zonal exhaust having to hit the ERV by pooling all zones requiring TRACK-SUPPLY or TRACK-BOTH under a separate (linked) system.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Remove ERV inputs in the linked system serving TRACK-SUPPLY / TRACK-BOTH spaces. I’m calling this the “lab” system.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Retain ERV inputs in the linked system serving all other zones. I’ll call this the “corridors” system.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Establish an OA-FROM SYSTEM tie – lab system sources OA from corridors system.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">d.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Adjust central airflow inputs (Supply / Return) between both systems to appropriate the correct supply/return/exfiltration to each pool of zones (per the above instruction).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">e.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Adjust central fan power inputs between both systems to ensure fan energy is not over/under represented<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">f.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The link will ensure all current/future edits to the associated schedules, controls, unitary efficiencies, etc… remain consistent (hopefully!)
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">The usual problem with OA-FROM-SYSTEM “DOAS” applications with dummy zones is that you have to jump through extra hoops to ensure heat in the return/relief
aistream gets seen at the DOAS… in this case we make that “problem” work for us: The ‘corridors’ system will only see internal loads from the child spaces. <o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo4"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Consider runaround loops for heat recovery in lab general/fume exhaust airstreams are not an unheard of (if not super-duper efficient in transfer) – you might actually
need/want to weight the total effectiveness for more than one ERV system.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Whichever path you choose, you’ll want to continue using custom hourly outputs to ensure the intended behaviors are modeled. Draw up your expectations for SYSTEM vs. ZONAL
airflow streams under different conditions (before and after ECM measures), and verify the expected behaviors using those hourly outputs.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">#ERV, #VAV, #exfiltration, #variable-exhaust, #required-reading-before-your-next-laboratory-model<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46"><img width="726" height="9" style="width:7.5625in;height:.0937in" id="Picture_x0020_12" src="cid:image001.png@01D2A177.0C1700E0" alt="cid:image001.png@01D2A177.0C1700E0"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#3A7A46"><o:p></o:p></span></p>
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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Suite 204<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Bishop, Bill via Equest-users<br>
<b>Sent:</b> Friday, March 17, 2017 3:08 PM<br>
<b>To:</b> David Eldridge <<a href="mailto:DEldridge@grummanbutkus.com">DEldridge@grummanbutkus.com</a>>; Nicholas Caton <<a href="mailto:ncaton@catonenergy.com">ncaton@catonenergy.com</a>>; Lapierre, Patrick <<a href="mailto:plapierre@bpa.ca">plapierre@bpa.ca</a>>;
Daniel Knapp <<a href="mailto:danielk@arborus.ca">danielk@arborus.ca</a>>; Miles H. Martschink <<a href="mailto:miles.martschink@rmf.com">miles.martschink@rmf.com</a>>;
<a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Energy Recovery Wheel on VAV System - zonal exhaust?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">David,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Yes the RETURN-CAP-RATIO limits flow to the ERV, as long as zone exhaust AIRFLOW-TRACKING is not set to TRACK-SUPPLY or TRACK-BOTH. (I just tried modeling it.)
If the zone exhaust tracks supply, there is no return to the air handler, and if there is an ERV it sees the total volume of zone exhaust.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The problem with specifying RETURN-CAP-RATIO or a system RETURN-FLOW that is less than the SUPPLY-FLOW is that fan energy for the return fan is only registered
for hours when the system supply flow rate exceeds (SUPPLY-FLOW – RETURN-FLOW). For example, my 100% OA system has 23,000 cfm supply and 13,000 cfm return with the rest going to a lab exhaust fan and some exfiltration. There is no return fan energy reported
until the hourly supply flow exceeds 10,000 cfm. Interestingly, the ERV fan power penalty associated with the system supply/return fans (when selecting HVAC-SUPPLY/RETURN for ERV-FANS) does not seem to be influenced by the zonal exhaust fan power even though
the energy recovered is influenced by zonal exhaust flow.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> David Eldridge [</span><a href="mailto:DEldridge@grummanbutkus.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mailto:DEldridge@grummanbutkus.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<br>
<b>Sent:</b> Friday, March 17, 2017 2:05 PM<br>
<b>To:</b> Bishop, Bill <</span><a href="mailto:bbishop@pathfinder-ea.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">bbishop@pathfinder-ea.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Nicholas Caton
<</span><a href="mailto:ncaton@catonenergy.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">ncaton@catonenergy.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Lapierre, Patrick <</span><a href="mailto:plapierre@bpa.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">plapierre@bpa.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
Daniel Knapp <</span><a href="mailto:danielk@arborus.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">danielk@arborus.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Miles H. Martschink <</span><a href="mailto:miles.martschink@rmf.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">miles.martschink@rmf.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
</span><a href="mailto:bfountain@greensim.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">bfountain@greensim.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Subject:</b> RE: [Equest-users] Energy Recovery Wheel on VAV System - zonal exhaust?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Does<b> Return-cap-ratio</b> limit the flow to the ERV? Since the dictionary excerpt below shows
<b>Return-cap-ratio </b>in the context of exfiltration for your approximation Bill, it wouldn’t matter to you if the “modeled airflow” for recovery came from the zones or the central, since it is 100% OA there wouldn’t be any return – you are just looking for
some BTU’s.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">There should certainly be an easier (more accurate) way to flag zonal exhausts for inclusion or exclusion from the ERV, I’d suggest that to be added to the features
list.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">David<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
</span></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#244061">Grumman/Butkus Associates</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
</span></u><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [</span><a href="mailto:equest-users-bounces@lists.onebuilding.org"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mailto:equest-users-bounces@lists.onebuilding.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<b>On Behalf Of </b>Bishop, Bill via Equest-users<br>
<b>Sent:</b> Friday, March 17, 2017 12:09 PM<br>
<b>To:</b> Nicholas Caton <</span><a href="mailto:ncaton@catonenergy.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">ncaton@catonenergy.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Lapierre, Patrick <</span><a href="mailto:plapierre@bpa.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">plapierre@bpa.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
Daniel Knapp <</span><a href="mailto:danielk@arborus.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">danielk@arborus.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Miles H. Martschink <</span><a href="mailto:miles.martschink@rmf.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">miles.martschink@rmf.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
</span><a href="mailto:bfountain@greensim.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">bfountain@greensim.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Cc:</b> </span><a href="mailto:equest-users@lists.onebuilding.org"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">equest-users@lists.onebuilding.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Subject:</b> Re: [Equest-users] Energy Recovery Wheel on VAV System - zonal exhaust?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I am modeling a laboratory air handler system with 100% OA, ERV at the air handler and a separate laboratory exhaust fan. I modeled the laboratory exhaust fan
as zonal exhaust and thought I would only get energy recovery from the remaining exhaust at the air handler but this is not the case, as described previously below and as I confirmed using a custom hourly report.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">How then to model energy recovery only for the central exhaust and not the zonal exhaust?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The one thing that comes to mind is to derate the design ERV effectiveness based on the % exhaust that returns to the ERV. The figure below (from Trane’s Ronnie
Moffitt, in the ASHRAE Handbook S26.11) shows the reduction in energy recovery as a function of bypassed exhaust.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="248" height="218" style="width:2.5833in;height:2.2708in" id="Picture_x0020_1" src="cid:image003.jpg@01D2A177.0C1700E0" alt="cid:image002.jpg@01D29F1D.191F37F0"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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</span></i></b><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">F: (585) 325-6005</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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Fee and Dividend - simple, effective, and market-based.</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Nicholas Caton [</span><a href="mailto:ncaton@catonenergy.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mailto:ncaton@catonenergy.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<br>
<b>Sent:</b> Monday, February 01, 2016 2:23 PM<br>
<b>To:</b> Lapierre, Patrick <</span><a href="mailto:plapierre@bpa.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">plapierre@bpa.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Daniel Knapp <</span><a href="mailto:danielk@arborus.ca"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">danielk@arborus.ca</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
Miles H. Martschink <</span><a href="mailto:miles.martschink@rmf.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">miles.martschink@rmf.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
</span><a href="mailto:bfountain@greensim.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">bfountain@greensim.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Cc:</b> </span><a href="mailto:equest-users@lists.onebuilding.org"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">equest-users@lists.onebuilding.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">; Bishop, Bill
<</span><a href="mailto:bbishop@pathfinder-ea.com"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">bbishop@pathfinder-ea.com</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">><br>
<b>Subject:</b> RE: [Equest-users] Energy Recovery Wheel on VAV System<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Count me as VERY happy to be corrected – thank you Patrick!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This certainly opens up some flexibility that I thought we were locked out of for some time. I’ll be re-evaluating my framework for these airflow relationships
moving forward!</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Nick</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#002060">NICK CATON, P.E.</span></b><span style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#1F497D"><br>
</span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782">Owner</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782">Caton Energy Consulting</span></b><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><br>
</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> 306 N Ferrel</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> Olathe, KS 66061</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> office: 785.410.3317</span><o:p></o:p></p>
<p class="MsoNormal"><a href="www.catonenergy.com"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#561782">www.catonenergy.com</span></a><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Lapierre, Patrick [mailto:</span><a href="mailto:plapierre@bpa.ca"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">plapierre@bpa.ca</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">]
<br>
<b>Sent:</b> Monday, February 01, 2016 1:08 PM<br>
<b>To:</b> Nicholas Caton; Daniel Knapp; Miles H. Martschink; </span><a href="mailto:bfountain@greensim.com"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">bfountain@greensim.com</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"><br>
<b>Cc:</b> </span><a href="mailto:equest-users@lists.onebuilding.org"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">equest-users@lists.onebuilding.org</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"><br>
<b>Subject:</b> RE: [Equest-users] Energy Recovery Wheel on VAV System</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092">Actually it’s quite confusing within DOE’s help but I think you are wrong Nick. Zonal exhaust does go throught the central heat exchanger.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092">Below is the extract from DOE’s volume that points this out :</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092"> </span><o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="1390" height="263" style="width:14.4791in;height:2.7395in" id="Image_x0020_2" src="cid:image007.png@01D2A177.0C1700E0" alt="cid:image009.png@01D29F1D.191F37F0"><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092">The last sentence clears it out.
</span><o:p></o:p></p>
<p class="MsoNormal"><b><u><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092">« All exhaust other than exfiltration is assumed to flow throught the ERV. This includes both zonal and central exhaust. »</span></u></b><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#366092"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#366092"><img border="0" width="34" height="31" style="width:.3541in;height:.3229in" id="Picture_x0020_6" src="cid:image008.jpg@01D2A177.0C1700E0" alt="cid:image010.jpg@01D29F1D.191F37F0"></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#3F3F3F">Patrick</span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#366092"> </span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#3F3F3F">Lapierre</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#7D7D7D">_ing.</span></b><o:p></o:p></p>
<p class="MsoNormal"><a href="mailto:plapierre@bpa.ca"><span style="font-size:7.5pt;font-family:"Arial",sans-serif">plapierre@bpa.ca</span></a><o:p></o:p></p>
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<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#BFBFBF"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">De :</span></b><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [</span><a href="mailto:equest-users-bounces@lists.onebuilding.org"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">mailto:equest-users-bounces@lists.onebuilding.org</span></a><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<b>De la part de</b> Nicholas Caton<br>
<b>Envoyé :</b> 1 février 2016 13:51<br>
<b>À :</b> Daniel Knapp <</span><a href="mailto:danielk@arborus.ca"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">danielk@arborus.ca</span></a><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">>; Miles H.
Martschink <</span><a href="mailto:miles.martschink@rmf.com"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">miles.martschink@rmf.com</span></a><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">>;
</span><a href="mailto:bfountain@greensim.com"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">bfountain@greensim.com</span></a><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Cc :</b> </span><a href="mailto:equest-users@lists.onebuilding.org"><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif">equest-users@lists.onebuilding.org</span></a><span lang="FR" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Objet :</b> Re: [Equest-users] Energy Recovery Wheel on VAV System</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="FR-CA"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I’m actually wrestling with re-understanding these issues in parallel with you, Miles.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The DOE-2 entry for EXHAUST-FLOW specifies zonal exhaust doesn’t get back to the air handler for exposure to heat recovery equipment at the system level (<u>I
wish it were an option</u>):</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="1236" height="570" style="width:12.875in;height:5.9375in" id="Picture_x0020_16" src="cid:image009.png@01D2A177.0C1700E0" alt="cid:image011.png@01D29F1D.191F37F0"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This diagram illustrates my current understanding/impression of what plays into the exhaust airflow seen for recovery:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="650" height="290" style="width:6.7708in;height:3.0208in" id="Picture_x0020_11" src="cid:image010.png@01D2A177.0C1700E0" alt="cid:image012.png@01D29F1D.191F37F0"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This is however the first I’ve heard that zonal exhaust doesn’t actually work into the balance to determine exhaust/relief exposed to energy recovery. Some parametric
tinkering is certainly in order! </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">My immediate thought is to wonder if the zonal EXHAUST-SOURCE (i.e. air handler vs. infiltration) could be playing into that observation? Seems to fit logic…</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Nick</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:14.0pt;font-family:"Calibri",sans-serif;color:#002060">NICK CATON, P.E.</span></b><span style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#1F497D"><br>
</span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782">Owner</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#561782"> </span></b><o:p></o:p></p>
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<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas">From: Equest-users [mailto:</span><a href="mailto:equest-users-bounces@lists.onebuilding.org"><span style="font-size:10.5pt;font-family:Consolas">equest-users-bounces@lists.onebuilding.org</span></a><span style="font-size:10.5pt;font-family:Consolas">]
On Behalf Of </span><a href="mailto:bfountain@greensim.com"><span style="font-size:10.5pt;font-family:Consolas">bfountain@greensim.com</span></a><span style="font-size:10.5pt;font-family:Consolas"><br>
Sent: Monday, February 01, 2016 11:22 AM<br>
To: Daniel Knapp<br>
Cc: Miles H. Martschink; </span><a href="mailto:equest-users@lists.onebuilding.org"><span style="font-size:10.5pt;font-family:Consolas">equest-users@lists.onebuilding.org</span></a><span style="font-size:10.5pt;font-family:Consolas"><br>
Subject: Re: [Equest-users] Energy Recovery Wheel on VAV System</span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas">Sadly Daniel, I do not think this is quite correct. In the current version of eQUEST/DOE2.2, if you add zonal exhaust the total amount of heat recovery does not change. I agree that
it should -- heat recovery should go down as zonal exhaust is increased, but eQUEST does not currently do this. I was quite surprised when it was pointed out to me.
</span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas"> A quick parametric test run where zonal exhaust is added will show that the total heat input will not go up when it should and on the ERV report (in the .sim) the amount of recovered
heat will not change.</span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-size:10.5pt;font-family:Consolas">If however, you set the return fan volume lower than the supply fan volume (on the fan -> flow parameters tab), then the heat recovery capacity will be reduced appropriately.</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"> Equest-users [mailto:</span><a href="mailto:equest-users-bounces@lists.onebuilding.org"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">equest-users-bounces@lists.onebuilding.org</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">]
<b>On Behalf Of </b>Daniel Knapp<br>
<b>Sent:</b> Monday, February 01, 2016 10:42 AM<br>
<b>To:</b> Miles H. Martschink<br>
<b>Cc:</b> </span><a href="mailto:equest-users@lists.onebuilding.org"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif">equest-users@lists.onebuilding.org</span></a><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif"><br>
<b>Subject:</b> Re: [Equest-users] Energy Recovery Wheel on VAV System</span><o:p></o:p></p>
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<p class="MsoNormal">Zone exhaust is presumed to exhaust directly to the outside without going back to the system, i.e. it is assumed that you are specifying a separate zonal exhaust fan that is not connected to the main VAV system. If you remove the zone exhaust,
the system level exhaust will be determined by the outdoor air fraction of the supply air. This outdoor air fraction will depend on the demand for outdoor air from the zones. i.e. the outdoor air is specified at the zone level, and determines the outdoor air
supply at the system level. <o:p></o:p></p>
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<p class="MsoNormal">Hope that helps,<o:p></o:p></p>
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<p class="MsoNormal">Dan<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">—<br>
Daniel Knapp PhD, P Phys, LEED AP O+M<br>
<a href="mailto:danielk@arborus.ca">danielk@arborus.ca</a><br>
<br>
Energy Efficiency Expert<br>
Arborus Consulting<br>
76 Chamberlain Ave<br>
Ottawa ON K1S 1V9<br>
(613) 234-7178<o:p></o:p></p>
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<p class="MsoNormal">—<br>
Daniel Knapp PhD, P Phys, LEED AP O+M<br>
<a href="mailto:danielk@arborus.ca">danielk@arborus.ca</a><br>
<br>
Energy Efficiency Expert<br>
Arborus Consulting<br>
76 Chamberlain Ave<br>
Ottawa ON K1S 1V9<br>
(613) 234-7178 <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On Feb 1, 2016, at 11:28 AM, Miles H. Martschink <<a href="mailto:miles.martschink@rmf.com">miles.martschink@rmf.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hello All,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I am trying to model an enthalpy energy recovery wheel on a VAV air handler serving multiple zones, and I cannot seem to get any exhaust air to pass through the wheel. I have
specified the design exhaust loads at the Zonal Level and I have also setup the wheel control sequence using values that others on this forum have posted:</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:Symbol">·</span><span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Operation
= OA Exhaust DT</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:"Courier New"">o</span><span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">DT
= 5 degree F</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:Symbol">·</span><span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Operating
Mode = OA Heat/Cool</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:Symbol">·</span><span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Make
up Air Temp Cntrl = Mixed Air Reset</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-.25in"><span style="font-size:11.0pt;font-family:Symbol">·</span><span style="font-size:7.0pt"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Capacity
Control = Bypass OA</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Whenever I run the model I get an error stating, “Energy Recovery ventilator: S1 Sys (VAVS) has an exhaust flow 50% of the supply flow. Performance may be compromised. OA &
Exhaust: 7313. 0.” The total sum of all the Zonal Exhaust Loads in 5505 CFM, and none of this is making it to the wheel. Does anyone have any insight as to what I might be doing wrong here? My end goal is to have the wheel modulate the return airflow in order
to match the Outside Air CFM demand by the VAV system. Any input is greatly appreciated.<span class="apple-converted-space"> </span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:#144C5C">Miles Martschink, Jr</span></b><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#144C5C">Mechanical Design Engineer</span><o:p></o:p></p>
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