<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.6000.16608" name=GENERATOR></HEAD>
<BODY>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2>The increase in heating energy is most likely the
result of additional boiler energy required to offset the reduced motor/pump
heat being transfered to the working fluid when you switched from a constant
volume to a variable volume pumping scheme.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2>Mike</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2>
<DIV align=left><FONT face="Arial Black" size=2>Michael Tillou, PE,
LEED</FONT></DIV>
<DIV align=left>
<DIV align=left><FONT face="Arial Black" size=1></FONT></DIV><FONT
face="Arial Black" size=1>P: 413-458-9870</FONT> <FONT face="Arial Black"
size=1>C: 413-652-1087</FONT></DIV></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=500274617-22022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<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>Shruti
Kasarekar<BR><B>Sent:</B> Friday, February 22, 2008 12:09 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re: [Bldg-sim]
FW:<BR></FONT><BR></DIV>
<DIV></DIV>Hello All,<BR><BR>I am modeling a 2 pipe FCU and when I change the 3
way valves to 2 way w/ a VFD on Pump, I see a considerable increase in Space
Heating. I checked that the load on my coils is changing. Why? I did not change
any other parameters. Any ideas?<BR><BR>Thanks.<BR></BODY></HTML>