<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><div></div><div>Bill and Kelly, thank you for your input.</div><div><br></div><div>Bill:</div><div>I have tried using the wizard to create the PVVT heat pump. I even used "system per zone" so that each zone is controlled independently. Even coming strait out of the wizard, there are plenty of heating hours not met. I understand that a stand air-to-air heat pump will be unable to operate in very cold weather, but that is where the supplemental heat should take over to get rid of any unmet hours. I have attached this model.</div><div><br></div><div>The actual system I am trying to model is the Mitsubishi Hyper Heating Inverter Y-Series Heat Pump. This system (in heating mode) uses electric resistance heat to warm the outdoor air before
it reaches the outdoor coils. This ensures that heat transfer will occur between the OA and the outdoor coil, and allows for operation at temperatures as low as -13*F. At first I thought that eQuest can not exactly model a system like this, so maybe eQuest is not allowing any heat transfer between the cold coil and the cold air. But then I tried again using the RESVVT, and it seems to work well, even in the middle of winter. My only objection to using the RESVVT is that I would like to have control over the OA.</div><div><br></div><div>Kelly:</div><div><br></div><div>You say that I can not use PVVT with an air cooled compressor, but it says that it is possible in the DOE2 help file, also, the wizard will set it up that way. Normally I would just use the PSZ or even PTAC to model an air-to-air heat pump, but I would like to use the variable speed compressor, so I need to use a VVT
system.</div><div><br></div><div><br></div><div>Has anyone modeled an air-to-air HP system that operates at such low temperatures before?<br></div><div><div><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt">Thanks,</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt">-Eddie</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Dakota Kelley <dakotak@teliospc.com><br><b><span style="font-weight: bold;">To:</span></b> Eddie Corwin <ecorwin@altanova-energy.com>;
equest-users@lists.onebuilding.org<br><b><span style="font-weight: bold;">Sent:</span></b> Wed, September 29, 2010 12:56:13 PM<br><b><span style="font-weight: bold;">Subject:</span></b> RE: [Equest-users] No Heating from PVVT Heat Pump<br></font><br>
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--></style><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">Water-cooled heat pumps, ground loop or not, are considered system type PVVT. Air-cooled heat pumps are considered type PSZ. Try changing your system type to PSZ and your heating source to “heat pump”. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">You can also create a temporary project and set up an air-source heat pump in the wizard, then go inspect the system type/settings in the detailed interface to see how eQUEST interprets your inputs.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;"> </span></p><p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"sans-serif";color:#1F497D;">Thanks,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"sans-serif";color:black;"> </span></p><p class="MsoNormal"><span style="margin-top:12px;width:82px;height:94px;"><img width="82" height="94" src="cid:1.1371607406@web1109.biz.mail.sk1.yahoo.com" alt=" "></span><span style="font-size:11.0pt;font-family:"sans-serif";color:black;"> </span></p><p class="MsoNormal" style="margin-left:.5in;text-indent:27.0pt;"><b><span style="font-size:10.0pt;font-family:"sans-serif";color:black;">DAKOTA KELLEY </span></b><b><span style="color:black;"></span></b></p><p class="MsoNormal" style="margin-left:.5in;text-indent:27.0pt;"><span
style="font-size:10.0pt;font-family:"sans-serif";color:black;">Project Designer | Energy Analyst</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";color:black;"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";color:black;"> </span><span style="font-size:8.0pt;font-family:"sans-serif";color:black;">Office: 214.744.6199 </span></p><p class="MsoNormal"><span
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class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"sans-serif";">From:</span></b><span style="font-size:10.0pt;font-family:"sans-serif";"> Eddie Corwin [mailto:ecorwin@altanova-energy.com] <br><b>Sent:</b> Wednesday, September 29, 2010 8:43 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] No Heating from PVVT Heat Pump</span></p></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";">So I determined why I was not getting any heating, and the resolutions perplexes me.</span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";"> I am modeling an Air-to-Air heat pump, so in the air-side system --> Basics tab I selected "NO" for
the field "WL/GS Ht Pump". In doing so, I get no heating out of the system. When I change the field to "YES" I now get heating. Attached are two images showing the field i am referring to, and showing that I have an air-cooled condenser. Does anyone know why this might be happening. I am worried that eQuest is treating my HP like a ground or water source HP instead of an air-to-air system. Any thoughts on the matter would be appreciated. By the way, I am using eQuest 3.64</span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";">-Eddie</span></p></div><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";"> </span></p></div><div><p
class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";"> </span></p><div><div class="MsoNormal" align="center" style="text-align:center;"><span style="font-size:10.0pt;font-family:"sans-serif";"><hr size="1" width="100%" align="center"></span></div><p class="MsoNormal" style="margin-bottom:12.0pt;"><b><span style="font-size:10.0pt;font-family:"sans-serif";">From:</span></b><span style="font-size:10.0pt;font-family:"sans-serif";"> Eddie Corwin <ecorwin@altanova-energy.com><br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Sent:</b> Tue, September 28, 2010 5:17:21 PM<br><b>Subject:</b> [Equest-users] No Heating from PVVT Heat Pump</span></p><div><div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif";color:black;">I am trying to model a PVVT system, that uses an air-cooled heat pump for heating and cooling. For some reason, the system
refuses to supply any heating. When I change the condenser type from air-cooled to water-cooled, the system WILL provide heat. Has anyone experienced problems like this, or has someone successful modeled a PVVT air-cooled heat pump? I have attached my IDF and PD2 file for review. </span></p></div></div></div></div></div></div></div></div></div></div><div style="position:fixed"></div>
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