[Bldg-sim] eQuest Coil Temperature Differential

Eric Studer estuder at dmiinc.com
Mon Jan 14 09:30:47 PST 2008


eQuest allows users to specify loop and coil design temperature
differentials, and yet it appears that these setpoints are not maintained
within the program.  For example, I can specify a hot water loop temperature
differential of 25°F and specify that all the coils are selected at 25°F,
yet the hourly temperature differentials are typically 40°F even when the
supply hot water temperature is held constant at the design temperature
throughout the year.  With 2-way control valves it seems as though the
temperature differential across the coils should remain within several
degrees of 25°F.  Do you agree?

The impact of the high coil/loop differential temperatures is the
underestimate of pump energy.

I posted a question similar to this in October and did not get a response,
so your input is greatly appreciated!

Thanks for your time,




Eric Studer, PE, LEED AP
35 Walnut Street
Wellesley, MA  02481
Ph:   (781) 431-1100 ext 12
Fax:  (781) 431-1109
e-mail:  estuder at dmiinc.com


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