<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Friends,</DIV>
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<DIV> We are simulating a 63 floor (900 ft tall) building with campus chilled water using the performance rating method for LEED. We are following the directions of "Required treatment of district thermal energy" guidelines.</DIV>
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<DIV>One of the requirements of Appendix G is to limit the pumping power to 22 W/GPM. This gives us a head of about 85 ft based on a 72% combined motor-mechanical efficiency. </DIV>
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<DIV>If the building used onsite chillers, the W/GPM limitation is probably justified considering we could locate chillers on mechanical floors at different levels and limit the pump head. However I am not sure if this limit is justified for campus chilled water where the water needs to be pumped from bottom up.</DIV>
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<DIV>I found this post in the archive which seems to address this issue<BR><A href="http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2003-December/001349.html" rel=nofollow target=_blank>http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2003-December/001349.html</A></DIV>
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<DIV>Can anyone please comment on their experience of this situation.<BR> </DIV>
<DIV>thanks,</DIV>
<DIV>raj</DIV></DIV><BR>
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