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To add to what Bill has mentioned, the beauty of a moderate
climate. Heat/cool recovery works best in extreme climates when you
have a large temperature or latent load differential. Depending on
the efficiency of the unit and it's power consumption I would assume
you have many hours where it's effect is neutral or possibly causing
you a penalty. You might try an ERV to pick up some of the latent
loads and help keep your RH down and avoid heating moist air. Check
the what you have happening for frost control. You might have
selected a schedule you don't need at 34F or the default has done it
for you. If you choose a duct heater for reheat or tempering you
will see how much energy the HRV is consuming to temper the air and
avoid frosting. You don't have to leave it that way but it does
give you clues as to what is happening. Once you have a little more
insight then you could come up with an alternate scheme to boost
your recovery. Sometimes it is cheaper and more effective to turn
it off and open a window.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
<div class="moz-cite-prefix">On 6/10/2016 6:52 PM, Bishop, Bill via
Equest-users wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Peter,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The model looks
sound and I don’t see any “oops” inputs so quick QC looks
okay.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Several things
are going on that can minimize the benefit of heat recovery:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Oregon weather file with peak heating
load at 34F<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Modest ventilation requirement with
roughly 20% OA<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Low ventilation hours (2600 hrs/year)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">High (?) infiltration rate (0.7 ACH)
representing 1/3 of your heating load for system sizing<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">Efficient boiler<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="color:#1F497D"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span
style="color:#1F497D">BOILER: MIN-RATIO = 0; START-UP-TIME =
0; STANDBY-TIME = 0 which totally eliminates cycling and
standby losses<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<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"><span style="color:#1F497D">\</span><span
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Peter Reppe, CPHC, LEED AP via
Equest-users<br>
<b>Sent:</b> Friday, June 10, 2016 4:47 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Heat recovery ventilation<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi folks, <o:p></o:p></p>
<p class="MsoNormal">In double-checking the savings numbers from
ventilation air heat recovery on my straight-forward VAV
system, I noticed that the heating savings are less than half
what I’d expect (based on back-of-the-envelope QC). I’m now
out of ideas where to look for input errors, and am rather
frustrated to see this happen on a pretty standard VAV system…
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Would someone here have a moment and take a
look, please (when running it, please use parametric run 4)?
I’d appreciate any feedback.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks much!!!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span
style="font-family:"Arial",sans-serif;color:#1F497D">Peter
Reppe, LEED AP, CPHC<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span
style="font-family:"Arial",sans-serif;color:#1F497D">Energy
Analyst<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img
id="Picture_x0020_1"
src="cid:part6.ABFDD061.F71D9EF1@bellnet.ca"
alt="cid:image003.jpg@01CE44D4.DD6A74A0" height="19"
border="0" width="19"></span><b><span
style="color:#17365D">Systems West Engineers<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">p.
541.342.7210<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Our
website has been renovated! See what’s new at
<a moz-do-not-send="true"
href="http://www.systemswestengineers.com/"><span
style="color:blue">www.systemswestengineers.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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