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<DIV dir=ltr align=left><SPAN class=809265312-17062008>Set the mech efficiency
then calc the required head needed as fred stated.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=809265312-17062008></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=809265312-17062008>Check out: <A
href="http://www.commercial.carrier.com/commercial/hvac/general/0,3055,CLI1_DIV12_ETI10630,00.html#HAP49">http://www.commercial.carrier.com/commercial/hvac/general/0,3055,CLI1_DIV12_ETI10630,00.html#HAP49</A> for
the calc.</SPAN></DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 9pt; FONT-FAMILY: Arial" align=left><B>Timothy Howe, MS,
LEED® AP</B><BR>Mechanical Engineer<BR>Stantec<BR></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
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<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Fred
Porter<BR><B>Sent:</B> Tuesday, June 17, 2008 8:36 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org; yizhao1@vt.edu<BR><B>Subject:</B> Re: [Bldg-sim]
A question about ASHRAE baseline loop pump power<BR></FONT><BR></DIV>
<DIV></DIV>
<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>
<DIV> </DIV>
<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
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