[Equest-users] CHW Pump differential temperature

[Dan Russell]

John, wouldn't there also be reduced chiller energy due to the pump introducing less heat into loop?

 Dan Russell, EIT

[cid:image001.jpg at 01C93E61.0B5A8000]

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Xavier García Casals
Sent: Friday, October 31, 2008 4:47 AM
To: Aulbach, John
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] CHW Pump differential temperature

Hi,
Probably because the chiller's EIR is reduced due to a more favorable inlet temperature. Have a look at your chiller performance curves in the model.

En/na Aulbach, John ha escrit:
All:

I have run a Base Case and a Parametric run for a Central Plant serving an office complex. Everything in both runs is the same, EXCEPT that the Base run has a 10°F differential temperature and the Parametric run has a 15°F differential temperature. The CHW pump is variable speed.

As expected, electric energy is saved (about 40,000 kWh/year for a 600 ton plant).  However, about 15,000 kWh is saved at the Chilled Water pump, and 22,000 kWh is saved at the chiller.

I changed the Loop Design DT to 15°F and the CHW Coil Design Delta T to 15°F.

Why is my chiller energy reducing?

Thanks.

John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
701 West Kimberly Ave., Suite 245
Placentia, CA 92870-6342 USA
Phone: 714-524-4402
Fax: 714-524-4407
email: jaulbach at nexant.com<mailto:jaulbach at nexant.com>







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Xavier García Casals



Sistemas Solares, Eficiencia Energética e Ingeniería Bioclimática

AIGUASOL INGENIERÍA



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