<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>Vishnu:</DIV>
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<DIV>I am guessing you let eQuest size the pumps. I will also bet you have the pumps set on STANDBY vs. DEMAND, Therefore, CHW pumps run all the time for the two chiller scenario, regardless if two chillers are needed.</DIV>
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<DIV>See if that helps.</DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Vishnuraj Nair <vishnu@kalpakrit.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wed, March 17, 2010 4:26:51 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Bldg-sim] Equest:Variation in pumping energy for Baseline system 8<BR></FONT><BR>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Dear friends, </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I am working on two projects of core and shell where the baseline system is system 8 i.e VAV with fan powered boxes.</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">There are two different building which are very similar in nature (not same) and situated at same location.</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">However there are differences in the way the two models are behaving.</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">I have shown the breakdown of different end uses as a percentage of overall baseline energy consumption</SPAN></FONT></P>
<P class=MsoNormal><B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT: bold"> </SPAN></FONT></B></P>
<P class=MsoNormal><B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Project 1</SPAN></FONT></B></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Plug loads: 25.5 % </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Interior Lighting: 16%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Cooling energy: 28.7%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Fan energy: 21%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Pumps: <FONT color=red><SPAN style="COLOR: red">6.3 %</SPAN></FONT></SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Space heating: 0.1%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Domestic hot water + Exterior Lighting: 1.3 %</SPAN></FONT></P>
<P class=MsoNormal><B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT: bold"> </SPAN></FONT></B></P>
<P class=MsoNormal><B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Project 2</SPAN></FONT></B></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Plug loads: 24 % </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Interior lighting: 15%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Cooling energy: 18%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Fan energy: 25%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Pumps: <FONT color=red><SPAN style="COLOR: red">15 %</SPAN></FONT></SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Space heating: 0.3%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Domestic hot water + Exterior Lighting: 1.3%</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">It can be seen that the energy consumed due to plug loads and interior lighting as a percentage of baseline are all most equal in both the cases.</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Can anyone suggest possible explanation or give hints as to why the pumping energy as a percentage of baseline has more than doubled in the</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> second case given that the characteristics of chiller, condenser and pump remain same ,given it is the baseline case. </SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">One difference is that the first project uses two chillers as it has conditioned area more than 1, 20,000 sq ft while the second project has only</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> one chiller ,its conditioned area being less than 1, 20,000</SPAN></FONT></P>
<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Vishnuraj Nair</SPAN></FONT></P>
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