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

[Esmireta]

Hi Joe,
Thanks for your reply!
Is the DOE-2.2 manual the DOE help in the eQuest?
Esmi






At 2013-04-18 03:17:00,"Joe Huang" <yjhuang at whiteboxtechnologies.com> wrote:
Do you not have a copy of a DOE-2.2 or DOE-2.1E manual?  That would make it hard to understand how DOE-2 works.
DOE-2 has many performance curves, depending on the type of equipment. The EIR-FT curves are either bi-linear or bi-quadratic functions of the entering wetbulb and outdoor drybulb temperature.  The EIR-FPLR curves can be linear, quadratic, or cubic functions of the Part Load Ratio (PLR).

By the way,what I said yesterday was in reference to packaged SYSTEMS.  If your model contains a PLANT model with a Chiller, then
the keywords for the chiller performance curves change somewhat.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.comwww.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 4/16/2013 11:09 PM, Esmireta wrote:
Hi Joe,
In the simulation of a district cooling system, the guidance requires a virtual plant with a constant average efficiency.
In the DOE curves, how can I know the meaning of the equation and the coefficients in it? It seems there is no useful information in the DOE help.
Thanks!
Esmi





At 2013-04-17 10:35:35,"Joe Huang" <yjhuang at whiteboxtechnologies.com> wrote:
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.comwww.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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