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<p class="MsoNormal"><span style="color:#1F497D">The default fan power in eQuest for water source heat pumps is not 0.000070 kW/CFM.<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">If you select the air source HP system type in the eQuest wizard, and then carry through to the Detailed Interface, you get what’s posted below.<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">This combination of TSP (1”) and overall efficiency of 53% results in fan power of ~ 0.221 watts/CFM. The water source heat pump type uses 50% efficiency and TSP = 1.0, and results in a similar value of 0.235
watts/CFM.<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">If your point is that these are less than the criticized PTAC value of 0.3 watts/CFM, it certainly is. Also, 4-P FCUs have default fan power values of ~ 0.18 watts/CFM because they assume 0.5” and 33% overall
efficiency. <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">If a Proposed Design was based on these really low default eQuest fan power values, it may be possible for the Proposed Design to absorb the fan power of the DOAS without a significant adverse fan power penalty,
or maybe none at all. However, these default values, in my opinion, clearly assume equipment with zero external supply and return ductwork. Consequently, I don’t think they would be applicable unless you had that exact situation, which many projects do not.<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">I think the value that Tim quoted below of 0.4 watts/CFM is more “real world” for unitary systems with ductwork. In fact, that matches exactly what I measured on the unit at my house.<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">If you are using appropriate fan power values for the Proposed Design unitary systems in the range of 0.40 watts/CFM, your Baseline has no allowance to counter the fan power of a DOAS, in fact, you are starting
with negative savings (i.e. 0.4 vs 0.3) from the start with no consideration of the DOAS.<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">And this [neverending] thread continues …<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><img width="1058" height="659" id="_x0000_i1027" src="cid:image004.png@01CE1690.35CEA580"><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;color:#339966"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="color:#339966">JAH<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;color:#339966"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><i><span style="color:#339966">James A. Hess, PE, CEM, BEMP</span></i></b><span style="color:#1F497D"><br>
Energy Engineer<br>
TME, Inc.<br>
Little Rock, AR<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Mobile: (501) 351-4667<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></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-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Howe, Timothy<br>
<b>Sent:</b> Friday, March 01, 2013 2:16 PM<br>
<b>To:</b> Bishop, Bill; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Water Loop HP system type fan power<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:10.0pt;font-family:"Arial","sans-serif";color:blue">I typically see around 0.000400 on HP system. Give or take a little bit depending on how you do your calc and what kind of electrical efficiency you assess to a
fractional hp motor.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">3 ton McQuay unit:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><img width="551" height="193" id="_x0000_i1025" src="cid:image002.png@01CE168E.F19F2930"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Timothy Howe, MS, BEMP, LEED® AP BD+C</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><br>
Mechanical Engineer<br>
Stantec<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">61 Commercial Street<br>
Rochester NY 14614<br>
Ph: (585) 413-5347<br>
Fx: (585) 272-1814<br>
Cell: (585) 281-3223<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:blue"><a href="http://www.stantec.com/"><b><span style="font-size:13.0pt;font-family:"Arial Narrow","sans-serif";color:#993333;text-decoration:none">stantec</span></b><span style="font-size:13.0pt;font-family:"Arial Narrow","sans-serif";color:#003F6E;text-decoration:none">.com</span></a></span><span style="font-size:13.0pt;font-family:"Arial Narrow","sans-serif";color:blue">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with Stantec's
written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:Webdings;color:#008040">ü</span><span style="color:blue"> </span><span style="font-size:10.0pt;font-family:"Arial Narrow","sans-serif";color:#008040">Please consider the environment before printing
this email.</span><span style="color:blue"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></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"">
<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Bishop, Bill<br>
<b>Sent:</b> Friday, March 01, 2013 3:06 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Water Loop HP system type fan power<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The eQUEST default is .000070 kW/cfm for the HP system type. This is the same as the default for Unit Heaters, and seems really low. It is only 1/4<sup>th</sup> the Appendix G. baseline PTAC/PTHP fan power, which has been criticized as
too low in another [neverending] thread.<o:p></o:p></p>
<p class="MsoNormal">Could there be an extra zero in there? (No, not the one on the end.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="mailto:wbishop@pathfinder-ea.com"><span style="text-decoration:none"><img border="0" width="480" height="114" id="Picture_x0020_1" src="cid:image003.jpg@01CE168E.F19F2930" alt="Senior Energy Engineer 28Jun2012"></span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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