Re: [EnergyPlus_Support] Reformulated Electric EIR chiller

[Lixing Gu <gu@xxxxxxxxxxxx>]

Yiqun:

When a normal chiller is used, leaving chilled water temperature and 
entering cooling water temperature are used to calculate COP using the 
Energy Input to Cooling Output Ratio Function of Temperature Curve and Part 
Load Ratio curve. When a reformulated chiller is selected, Leaving Chilled 
Water Temperature and Leaving Condenser Water Temperature are used to 
calculate an EIR modifier, instead of entering cooling water temperature. 
Leaving Condenser Water Temperature and Part Load Ratio are used to 
calculate part load penalty. Could you let me know what leaving condenser 
water temperature and leaving chilled water temperature are?

Thanks.

Lixing
----- Original Message ----- 
From: "&#28504;&#27589;&#32676;" <yiqunpan@xxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, July 17, 2008 3:52 AM
Subject: [EnergyPlus_Support] Reformulated Electric EIR chiller


> On the Engineering Reference, it is said that the reformulated EIR
> chiller model can improve the accuracy of simulating a VSD chiller
> significantly from normal EIR chiller model. However I got some
> ubnormal results from the reformulated model. I selected a model from
> the chiller datasets of E+ - ReformEIRChiller Trane CVHF
> 2317kw/6.33COP/VSD, and tried to obtain the changing trend of COP
> following its part load ratio and found that its COP decreases with the
> part load ratio decreases, with the same leaving chilled water
> temperature and entering cooling water temperature. I also tried with a
> normal EIR chiller model from the datasets, but got different changing
> trend, which COP reaches its peak when the part load ratio is aroung
> 50%. It seems that the result from normal EIR chiller model is more
> close to the actural condition.
>
> Has anybody tried the same thing and is able to tell me something about
> it? thanks.
>
> Yiqun Pan
> Tongji University
>
>
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