[Equest-users] How to set the COP of a chiller as constant in eQuest?

[James Hess]

Perhaps this would come into play if you are modeling a plant with stipulated efficiencies per the USGBC DESv2.0 guidelines with the "Option 2" approach.

My post on 4/7/13 covers exactly how to create custom chiller curves for a chiller resulting in a constant EIR that matches the stipulated efficiency value of 4.4 COP + 5% losses (i.e. 0.839 kW/ton).

Thanks!

Regards,

JAH

James A. Hess, PE, CEM, BEMP
Energy Engineer
TME, Inc.
Little Rock, AR
Mobile: (501) 351-4667

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Tuesday, April 16, 2013 9:36 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] How to set the COP of a chiller as constant in eQuest?

DOE-2 modifies the COOL-EIR using several curves COOL-EIR-FT as a function of outdoor conditions and COOL-EIR-FPLR as a function of the Part Load Ratio. I suppose you could set those to be constant. Another way would be to just take the Cooling Load from the SS-D report and divide that by your constant COP.  But my question would be, why do you want to do that ?

Joe


Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 108D

Moraga CA 94556

yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>

www.whiteboxtechnologies.com<http://www.whiteboxtechnologies.com>

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 4/16/2013 6:55 PM, Esmireta wrote:
Dear all,
I wonder how to set the COP of a chiller as constant? after I set the chiller type, the electric input ratio type is determined, which means the self-made constant curve cannot be input.
Thanks!
Esmi








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