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--></style></head><body lang="EN-US" link="blue" vlink="purple" style="text-justify-trim:punctuation"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">Hello Hang Cui,</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">From your choice of words, I think you intended to include the eQuest-users mailing list and so I am CC’ing in response as this may help others. The files you sent are fine for reviewing the question at-hand, but be aware you may want to attach your weather file as well if you should later need help concerning specific simulation outputs/results.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">The system diagram and description below is helpful. You may have correctly identified a difference in common terminology between our languages. Rather than simply “Air-cooled heat pump,” which represents a rather broad category of equipment/system configurations, and referencing your illustration, I might more specifically describe your intended system as a “2-pipe fancoil system with air-source heat pumps on heating/cooling water loop.” This presumes the same loop is used for heating or cooling (but never both simultaneously). </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">If that description seems accurate, I would concede that I’m not aware of a 2-pipe configuration system option currently included in the wizards (perhaps someone else in the list can chime in here?), but there is some direct guidance for this system type in the help files.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">Referencing your file I would first explore setting your chillers to be of type ‘Heat Pump’ (HEAT-PUMP) and to change your primary CHW loop servicing the terminal fancoils to be of type ‘2-Pipe’ (‘PIPE2’). </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">I would then review this article and its children in the DOE-2 help files: <b><a href="mk:@MSITStore:C:\Users\Nick\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/volume2dictionary.htm"><span style="color:#002060;text-decoration:none">Volume 2: Dictionary</span></a> > <a href="mk:@MSITStore:C:\Users\Nick\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/hvaccomponents.htm"><span style="color:#002060;text-decoration:none">HVAC Components</span></a> > <a href="mk:@MSITStore:C:\Users\Nick\Documents\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/chiller1.htm"><span style="color:#002060;text-decoration:none">CHILLER</span></a> > Air-to-Water Heat-Pump (HEAT-PUMP, AIR-COOLED)</b></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">Also consider the DOE-2 help entries concerning 2-pipe loops and airside FC 2-pipe system operations to ensure you do not miss any of the associated inputs required, particularly the loop operation inputs which determine on what conditions the loop will change between heating and cooling operation. A conversation with your system/controls engineer(s) (if that is not already you) may prove helpful on this point.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">I would also advise 2-pipe systems by their nature have potential for “expected unmet hours” when you have zones that require heating and cooling at the same time served by a common loop and for a period when the loop must “switch modes” during swing seasons. Be mindful of that nature and give consideration to whether it will make sense to remove certain zone thermostats from the simulation (or else evaluate what an acceptable range of coincident unmet hours must be with all conditioned zones reporting).</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">I confess that while I have related design/specification experience for residential and small commercial cases, I haven’t performed a 2-pipe system energy analysis in recent memory, so I’m probably missing some details – keep your eyes and mind open as you proceed!</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">~Nick</span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><div><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:14.0pt;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;color:#561782">Owner</span></b></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:11.0pt;color:#561782"> </span></b></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:10.0pt;color:#561782">Caton Energy Consulting</span></b><span style="font-size:10.0pt;color:black"><br></span><span style="font-size:10.0pt;color:#1f497d"> 306 N Ferrel</span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#1f497d"> Olathe, KS 66061</span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#1f497d"> office: 785.410.3317</span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#561782"><a href="www.catonenergy.com"><span style="color:#561782">www.catonenergy.com</span></a></span><span style="font-size:11.0pt;color:#002060"></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:11.0pt">From:</span></b><span style="font-size:11.0pt"> Hang Cui [mailto:<a href="mailto:bj_hangcui@sina.com">bj_hangcui@sina.com</a>] <br><b>Sent:</b> Wednesday, December 02, 2015 10:35 PM<br><b>To:</b> 'Nicholas Caton'<br><b>Subject:</b> </span><span style="font-size:11.0pt;font-family:"MS Gothic"">答复</span><span style="font-size:11.0pt">: [Equest-users] Question about air-cooled heat pump</span></p></div></div><p class="MsoNormal" align="left" style="text-align:left"> </p><p class="MsoNormal"><span style="color:#1f497d">Thanks for Nick.</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">I am not sure if this is the right way to send my project to you all. I attach my .inp and .pd2 file in this mail. Please let me know if you can see that. </span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">According to Nick's description, do you mean that it might have chance to set an air-cooled heat pump by adjusting the inp file of a wizard-generated DX system project? To my knowledge, DX system can be used to simulate a VRV system that the refrigerant will flow between the fan-coil in the room and the primary equipment outdoor. However, what I need is an air-cooled heat pump that the refrigerant will flow only in the primary equipment and the chilled or hot water will flow in the fan-coil for cooling or heating the room. Since I am not sure if my expression is clear (sorry , my pool language skill), I attach two figures for your convenience.</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d"><img border="0" width="1027" height="437" id="图片_x0020_19" src="cid:image004.jpg@01D12D58.C4FA6050"></span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">Looking forward your reply.</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">Regards</span></p><p class="MsoNormal"><span style="color:#1f497d">i</span></p><div><p class="MsoNormal" align="left" style="text-align:left"><img width="79" height="79" src="cid:image005.jpg@01D12D58.C4FA6050" align="left" hspace="12" alt="2013510165753581"><span style="mso-fareast-language:ZH-CN"><span style="color:#1f497d"><br clear="all"></span></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1c467a">Hang Cui</span></b><i><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> <br></span></i><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span></b><span style="color:#1f497d"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">China Construction Engineering Design Grounp Co., Ltd.</span></b><span style="color:#1f497d"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Building 15, Sanlihe Road</span><span style="color:#1f497d"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Beijing, 100000</span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#595959"><br></span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">e-mail: <a href="mailto:bj_hangcui@sina.com">bj_hangcui@sina.com</a></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"><a href="http://www.cscecbdi.com">www.cscecbdi.com</a></span><span style="color:#1f497d"></span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal" align="left" style="text-align:left"><b><span lang="ZH-CN" style="font-size:10.0pt;font-family:SimSun">发件人</span></b><b><span style="font-size:10.0pt;font-family:SimSun">:</span></b><span style="font-size:10.0pt;font-family:SimSun"> Nicholas Caton [<a href="mailto:ncaton@catonenergy.com">mailto:ncaton@catonenergy.com</a>] <br><b><span lang="ZH-CN">发送时间</span>:</b> 2015<span lang="ZH-CN">年</span>12<span lang="ZH-CN">月</span>3<span lang="ZH-CN">日</span> 8:14<br><b><span lang="ZH-CN">收件人</span>:</b> Jones, Christopher; <span lang="ZH-CN">崔航</span>; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b><span lang="ZH-CN">主题</span>:</b> RE: [Equest-users] Question about air-cooled heat pump</span></p></div></div><p class="MsoNormal" align="left" style="text-align:left"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">Agreed, it would help solve the issue to see the project at-hand.</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060">That said, you *should* be able to generate a variety of air-cooled heatpump system configuratinos using the DD wizards. It might prove helpful to quickly create a separate simple project in that manner, befitting your actual system, to compare wizard-generated inputs against your current project.</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"><img border="0" width="747" height="542" id="_x0000_i1026" src="cid:image006.png@01D12D58.C4FA6050"></span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span><span style="mso-fareast-language:ZH-CN"></span></p><div><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:14.0pt;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;color:#561782">Owner</span></b><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:11.0pt;color:#561782"> </span></b><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:10.0pt;color:#561782">Caton Energy Consulting</span></b><span style="font-size:10.0pt;color:black"><br></span><span style="font-size:10.0pt;color:#1f497d"> 306 N Ferrel</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#1f497d"> Olathe, KS 66061</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#1f497d"> office: 785.410.3317</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:10.0pt;color:#561782"><a href="www.catonenergy.com"><span style="color:#561782">www.catonenergy.com</span></a></span><span style="mso-fareast-language:ZH-CN"></span></p></div><p class="MsoNormal"><span style="font-size:11.0pt;color:#002060"> </span><span style="mso-fareast-language:ZH-CN"></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:11.0pt">From:</span></b><span style="font-size:11.0pt"> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Jones, Christopher<br><b>Sent:</b> Friday, November 27, 2015 7:10 AM<br><b>To:</b> </span><span lang="JA" style="font-size:11.0pt;font-family:"MS PGothic",sans-serif">崔航</span><span style="font-size:11.0pt">; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Question about air-cooled heat pump</span><span style="mso-fareast-language:ZH-CN"></span></p></div></div><p class="MsoNormal" align="left" style="text-align:left"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">I suggest posting your .inp and .pd2 file to the egroup. Someone will look at it to determine what might be incorrect.</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span><span style="mso-fareast-language:ZH-CN"></span></p><div><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:11.0pt;color:#1f497d"> </span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:11.0pt;color:#1f497d"><img border="0" width="108" height="43" id="Picture_x0020_2" src="cid:image007.png@01D12D58.C4FA6050" alt="cid:image003.png@01D09C46.E75BA0D0"></span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1c467a">Christopher Jones,</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">P.Eng.<i> <br></i></span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Senior Engineer</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span></b><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">WSP Canada Inc.</span></b><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">2300 Yonge Street, Suite 2300</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">Toronto, ON M4P 1E4</span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#595959"><br></span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">T +1 416-644-4226</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">F +1 416-487-9766</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d">C +1 416-697-0056</span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span><span style="mso-fareast-language:ZH-CN"></span></p><p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"><a href="http://www.wspgroup.com/">www.wspgroup.com</a> </span><span style="mso-fareast-language:ZH-CN"></span></p></div><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1f497d"> </span><span style="mso-fareast-language:ZH-CN"></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal" align="left" style="text-align:left"><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 [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>??<br><b>Sent:</b> Friday, November 27, 2015 1:54 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Question about air-cooled heat pump</span><span style="mso-fareast-language:ZH-CN"></span></p></div></div><p class="MsoNormal" align="left" style="text-align:left"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">Dear eQuest users</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">Recently, I got a problem when I try to simulate an air-cooled heat pump. Since we cannot choose air-cooled heat pump under wizard mode, I try to set it under detailed mode. What I have done:</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">1. Switch the default 'chilled water loop' to '2-pipe loop';</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">2. Switch the chiller type to 'heat pump';</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">3. Switch the HW loop to 'chilled water loop' in air-side system;</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">However, when I try to switch the condenser type to 'air cooled', an error is shown like 'assigned symbol air-cooled is of an incompatible type'. Does anyone be confused by this situation? I guess someone may have solution for this.</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">Regards</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">Hang Cui</span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN"> </span></p><p class="MsoNormal"><span style="mso-fareast-language:ZH-CN">e-mail: <a href="mailto:bj_hangcui@sina.com">bj_hangcui@sina.com</a></span></p><div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:12.0pt;font-family:"MS PGothic",sans-serif"><hr size="2" width="100%" align="center"></span></div><div><p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:gray"><br>You are receiving this communication because you are listed as a current WSP contact. 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