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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><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></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></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></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img width="1236" height="570" id="Picture_x0020_16" src="cid:image002.png@01D15CEF.2B651900"></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></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></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img width="650" height="290" id="Picture_x0020_11" src="cid:image001.png@01D15CED.F2279560"></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></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></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></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></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><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><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#561782"> </span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></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><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> Olathe, KS 66061</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> office: 785.410.3317</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#561782"><a href="www.catonenergy.com"><span style="color:#561782">www.catonenergy.com</span></a></span></p><div style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 1.0pt 0in"><p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p></div><p class="MsoPlainText">From: Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] On Behalf Of <a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a><br>Sent: Monday, February 01, 2016 11:22 AM<br>To: Daniel Knapp<br>Cc: Miles H. Martschink; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>Subject: Re: [Equest-users] Energy Recovery Wheel on VAV System</p><p class="MsoPlainText"> </p><p class="MsoPlainText">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. </p><p class="MsoPlainText"> 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.</p><p class="MsoPlainText"> </p><p class="MsoPlainText">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.</p><p class="MsoPlainText"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><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:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <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> <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</span></p></div></div><p class="MsoNormal"> </p><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. </p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Hope that helps,</p></div><div><p class="MsoNormal">Dan</p></div><div><p class="MsoNormal"> </p><div><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</p></div></div><div><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 </p></div><p class="MsoNormal"> </p><div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><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:</p></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hello All,</span></p></div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p></div><div><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></p></div><div style="margin-left:.5in"><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></p></div><div style="margin-left:1.0in"><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></p></div><div style="margin-left:.5in"><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></p></div><div style="margin-left:.5in"><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></p></div><div style="margin-left:.5in"><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></p></div><div><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></p></div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p></div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thanks,</span></p></div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p></div><div><p class="MsoNormal"><b><span style="font-family:"Calibri","sans-serif";color:#144c5c">Miles Martschink, Jr</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span></p></div><div><p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#144c5c">Mechanical Design Engineer</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span></p></div><div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Calibri","sans-serif";color:#144c5c">______________________________<br></span><span style="font-size:5.0pt;font-family:"Calibri","sans-serif";color:#144c5c"><br></span><b><span style="font-family:"Calibri","sans-serif";color:#144c5c">RMF Engineering<br></span></b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#474d4f">Reliability. Efficiency. Integrity.<br></span><span style="font-size:5.0pt;font-family:"Calibri","sans-serif";color:#474d4f"><br></span><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#474d4f">p: 843.971.9639<br></span><b><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#bd974e"><a href="http://www.rmf.com/"><span style="color:#bd974e">www.rmf.com</span></a><br></span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a href="https://www.linkedin.com/company/rmf-engineering-inc.?trk=nav_account_sub_nav_company_admin"><span style="text-decoration:none"><image005.png></span></a><a href="https://www.facebook.com/pages/RMF-Engineering/193267750706493?ref=hl"><span style="text-decoration:none"><image006.png></span></a></span></p></div><div><p class="MsoNormal"><i><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#144c5c"> </span></i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span></p></div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p></div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><br><br style="text-align:start;word-spacing:0px"><br></span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""></span></p><div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><hr size="2" width="100%" align="center"></span></div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">This email has been scanned for email related threats and delivered safely by Mimecast.<br>For more information please visit<span class="apple-converted-space"> </span><a href="http://www.mimecast.com/"><span style="color:purple">http://www.mimecast.com</span></a></span></p><div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><hr size="2" width="100%" align="center"></span></div><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif"">_______________________________________________<br>Equest-users mailing list<br></span><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:purple">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</span></a><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif""><br>To unsubscribe from this mailing list send a blank message to<span class="apple-converted-space"> </span></span><a href="mailto:EQUEST-USERS-UNSUBSCRIBE@onebuilding.org"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:purple">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</span></a></p></div></blockquote></div><p class="MsoNormal"> </p></div></body></html>