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<TITLE>RE: [BLDG-SIM] Modeling DX with reheat in VisualDOE/DOE-2</TITLE>
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<P><FONT SIZE=2>This looks like a better method. There would be no "master" zone, and the system would be on either heating or cooling with reheat. And no worry from killing the pumping.</FONT></P>
<P><FONT SIZE=2>Sounds like Michael has it !!</FONT>
</P>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Michael Wilson [<A HREF="mailto:mwilsonbc@yahoo.com">mailto:mwilsonbc@yahoo.com</A>]</FONT>
<BR><FONT SIZE=2>Sent: Monday, April 07, 2003 3:28 PM</FONT>
<BR><FONT SIZE=2>To: Aulbach, John; BLDG-SIM@GARD.COM</FONT>
<BR><FONT SIZE=2>Cc: 'BLDG-SIM@gard.com'</FONT>
<BR><FONT SIZE=2>Subject: Re: [BLDG-SIM] Modeling DX with reheat in VisualDOE/DOE-2</FONT>
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<P><FONT SIZE=2>You might also try using a packaged VAV (PVAVS) system</FONT>
<BR><FONT SIZE=2>and setting the central heating capacity to zero (or</FONT>
<BR><FONT SIZE=2>very small), and the box minimums to 100% so it acts</FONT>
<BR><FONT SIZE=2>like a constant volume system. Then you should get DX</FONT>
<BR><FONT SIZE=2>cooling and reheat heating.</FONT>
</P>
<BR>
<P><FONT SIZE=2>--- "Aulbach, John" <JAulbach@semprasolutions.com></FONT>
<BR><FONT SIZE=2>wrote:</FONT>
<BR><FONT SIZE=2>> As a long time DOE-2 user, I would go with the</FONT>
<BR><FONT SIZE=2>> Constant Volume Reheat, make</FONT>
<BR><FONT SIZE=2>> the chiller an air cooled DX, and kill the hot water</FONT>
<BR><FONT SIZE=2>> and chilled water</FONT>
<BR><FONT SIZE=2>> pumps. As you appear to be running Visual DOE, you</FONT>
<BR><FONT SIZE=2>> do not have the "fancy"</FONT>
<BR><FONT SIZE=2>> version of DOE-2.1E to actually put in kW/GPM for</FONT>
<BR><FONT SIZE=2>> hot and chilled water</FONT>
<BR><FONT SIZE=2>> pumps. You need to keep the pseudo-chilled water</FONT>
<BR><FONT SIZE=2>> flow going to the the</FONT>
<BR><FONT SIZE=2>> chiller (else the chiller will not operate). The</FONT>
<BR><FONT SIZE=2>> fact you have electric heat</FONT>
<BR><FONT SIZE=2>> negates any problems with the hot water pump.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Try something like 100% loss or 0% motor efficiency</FONT>
<BR><FONT SIZE=2>> to remove any pump kW.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Hope it works. Have BLDG-SIMs other "wise"</FONT>
<BR><FONT SIZE=2>> emissaries input at well.</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: John M. Topmiller [<A HREF="mailto:jmt@abacus-engr.com">mailto:jmt@abacus-engr.com</A>]</FONT>
<BR><FONT SIZE=2>> Sent: Monday, April 07, 2003 5:42 AM</FONT>
<BR><FONT SIZE=2>> To: BLDG-SIM@gard.com</FONT>
<BR><FONT SIZE=2>> Subject: [BLDG-SIM] Modeling DX with reheat in</FONT>
<BR><FONT SIZE=2>> VisualDOE/DOE-2</FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> I have a fairly simple system in a building that I</FONT>
<BR><FONT SIZE=2>> am modeling but I'm not</FONT>
<BR><FONT SIZE=2>> sure the best DOE-2 system to use. The building is</FONT>
<BR><FONT SIZE=2>> served by one air</FONT>
<BR><FONT SIZE=2>> handler in the middle of the building with DX</FONT>
<BR><FONT SIZE=2>> cooling and no heating at the</FONT>
<BR><FONT SIZE=2>> unit level. Each of the two sides of the building</FONT>
<BR><FONT SIZE=2>> has electric resistance</FONT>
<BR><FONT SIZE=2>> reheats in the ducts; I'd figure I'd model the</FONT>
<BR><FONT SIZE=2>> building with two zones each</FONT>
<BR><FONT SIZE=2>> with 50 kW reheat. I considered modeling the system</FONT>
<BR><FONT SIZE=2>> as Packaged Single Zone</FONT>
<BR><FONT SIZE=2>> AC with Heating and Subzone Reheating, however, with</FONT>
<BR><FONT SIZE=2>> this system the heating</FONT>
<BR><FONT SIZE=2>> in the control zone comes from the air handler and</FONT>
<BR><FONT SIZE=2>> only the subzones have</FONT>
<BR><FONT SIZE=2>> reheat capabilities. With this system I'd have to</FONT>
<BR><FONT SIZE=2>> set up a dummy control</FONT>
<BR><FONT SIZE=2>> zone to truly model the building. The system also</FONT>
<BR><FONT SIZE=2>> is close to the</FONT>
<BR><FONT SIZE=2>> Constant-Volume Reheat Fan System in the DOE-2</FONT>
<BR><FONT SIZE=2>> manual, but I have DX cooling</FONT>
<BR><FONT SIZE=2>> and not a chiller and cooling coil system. With</FONT>
<BR><FONT SIZE=2>> this system I'd have to</FONT>
<BR><FONT SIZE=2>> convert the cooling loads of the chiller to that of</FONT>
<BR><FONT SIZE=2>> a DX system. </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Does anyone have any experience with this type of</FONT>
<BR><FONT SIZE=2>> system and know the best</FONT>
<BR><FONT SIZE=2>> way to proceed? </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> Thanks, </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> John M. Topmiller, CEM </FONT>
<BR><FONT SIZE=2>> Energy Engineer </FONT>
<BR><FONT SIZE=2>> Abacus Engineered Systems </FONT>
<BR><FONT SIZE=2>> 4431 North Front St., Suite 100</FONT>
<BR><FONT SIZE=2>> Harrisburg, PA 17110-1709 </FONT>
<BR><FONT SIZE=2>> p: (717) 232-8182 ext. 239 </FONT>
<BR><FONT SIZE=2>> c: (717) 514-9767</FONT>
<BR><FONT SIZE=2>> f: (717) 232-8187 </FONT>
<BR><FONT SIZE=2>> <<A HREF="mailto:jmt@abacus-engr.com">mailto:jmt@abacus-engr.com</A>> jmt@abacus-engr.com </FONT>
<BR><FONT SIZE=2>> </FONT>
<BR><FONT SIZE=2>> <<A HREF="http://www.abacus-engr.com" TARGET="_blank">http://www.abacus-engr.com</A>> www.abacus-engr.com </FONT>
<BR><FONT SIZE=2>> </FONT>
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<P><FONT SIZE=2>=====</FONT>
<BR><FONT SIZE=2>Michael Wilson</FONT>
<BR><FONT SIZE=2>455 Elphinstone Ave.</FONT>
<BR><FONT SIZE=2>Gibsons, BC, V0N 1V1</FONT>
<BR><FONT SIZE=2>604-886-9864 phone</FONT>
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