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<DIV>I deal with this by adjusting the "pipe-head" of the loop until the total specific design pump power = 19 W/gpm, while still letting eQuest/DOE2 "autosize" the pumps.</DIV>
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<DIV>I believe this W/gpm should be calculated as (sum of all pump power for both "primary" and "secondary" pumps connected to a loop)/design loop flow. In addition to the loop (secondary) pump, the ASHRAE baseline includes primary pumps, in DOE-speak, a "CHW-PUMP" and "CW-PUMP" for each chiller, which is not the way eQuest sets things up by default. And only the "primary" pump on the CW loop.<BR></DIV>
<DIV>Fred</DIV>
<DIV><BR>>>> <yizhao1@vt.edu> 6/17/2008 12:10 AM >>><BR><BR>Hi all –<BR>I’m working on an ASHRAE baseline model with system #7 in eQuest. ASHRAE<BR>requires the chilled water loop pump power of 19W/gpm. So I ran the model with<BR>the default head and pump kW (left then blank) first, and found the gpm of the<BR>pump from the report, then I calculated and input the kW of the pump. However,<BR>after I ran the model again with this pump power, the pump gpm result was<BR>changed in the report. Also, I got a warning that said the pump flow input is<BR>lower than the actual flow. There is no input for a pump flow. So I don’t know<BR>what happened inside eQuest.<BR><BR>Do you know what is wrong here? How to model the ASHRAE loop pump power<BR>correctly in eQuest?<BR><BR>Thanks a lot!<BR><BR><BR>Ying<BR><BR>_______________________________________________<BR>Bldg-sim mailing list<BR><A href="http://lists.onebuilding.org/listinfo.cgi/bldg">http://lists.onebuilding.org/listinfo.cgi/bldg</A>-sim-onebuilding.org<BR>To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR></DIV></BODY></HTML>