[BLDG-SIM] Variable Speed Pumping in PowerDOE

[Peter Moberg]

I am using PowerDOE to model a building with powered induction unit systems
and standard VAV terminals.  One ECM involves changing the hot water pump
from constant to variable speed.  Surprisingly, this increases the overall
energy use by more than one percent.   The pumping energy decreases as
expected, but the boiler fuel consumption increases.  Does anyone know why
this is so?   Thanks.

Peter Moberg
InSite Group, Inc.
7100 SW Hampton Ste. 231
Tigard, OR 97223
Ph. 503 670 1990
Fax 503 670 1040

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