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<DIV><FONT face=Arial size=2>Hello,</FONT></DIV>
<DIV><FONT face=Arial size=2>Has anyone had PowerDOE experience modeling VFDs on
hot water pumps with two-way valves on the coils vs.constant speed pumps and
three way valves? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>We have tried this measure on more than one model
and get a strange result. With the VFDs, the pump electric energy
decreases as expected, but there is a substantial penalty in fuel use for
heating which we cannot explain. The fuel penalty is much greater than
what you could attribute to the energy that a constant speed pump would be
adding to the fluid.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Has anyone else had this result, and does anyone
have any suggestions? Any help would be appreciated.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks.</FONT></DIV><FONT face=Arial size=2>
<DIV><BR>Sincerely,</DIV>
<DIV> </DIV>
<DIV>Alec Stevens<BR>DMI<BR>450 Lexington St.<BR>Newton, MA 02466<BR>p:
617-527-1525x105 f: 617-527-6606<BR>e: <A
href="mailto:astevens@dmiinc.com">astevens@dmiinc.com</A> </DIV>
<DIV> </DIV>
<DIV>p.s. I got a voicemail from someone in the group the other day about
refrigeration modeling. The voicemail got garbled and I didn't catch all
the contact info. I believe the name of the person who called me was David
Civic. David, if you could please get in touch with me via email, I'll try
to give some assistance, but it has been a while since I've modeled any
supermarkets. </DIV>
<DIV> </DIV>
<DIV>The question was: How does DOE take into account the space load on
refrigeration casework? If anyone else has suggestions on this, maybe they
can post info to the group.</DIV>
<DIV> </DIV>
<DIV>Thanks!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV><PRE>
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