# [Bldg-sim] Chiller COP

Jeff Haberl jhaberl at tamu.edu
Sat Aug 23 11:20:24 PDT 2014

```FYI:

The bi-quadradic equations in DOE-2, EQUEST, and Energyplus are good if you have real data to "tune" them. These are what Hydeman's toolkit are based on. Otherwise, the work by Jeff Gordon and K. Ng on semi-empirical chiller models is helpful, and has lumped thermodynamic properties. ASHRAE RP 827 is also helpful for in-situ situations.

Jeff

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Jeff S. Haberl, Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......jhaberl at tamu.edu
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________________________________________
From: Bldg-sim [bldg-sim-bounces at lists.onebuilding.org] on behalf of Peter Simmonds [psimmonds11 at gmail.com]
Sent: Friday, August 22, 2014 5:19 PM
To: Sambhav Tiwari
Cc: bldg-sim
Subject: Re: [Bldg-sim] Chiller COP

Pure theory the chiller is a Rankine cycle and there is a formula to derive the cycle from the evaporating and condensing temperature of the chiller then you multiply the Rankine cycle by the efficiency of the motor driving the compressor and get COP.
Jim and Joe are correct that the simulation program does this for you ( in most cases), however if you want to design your own chiller I would suggest the cool tool program that Mark Hydeman derived many years ago which I believe can de downloaded from the Taylor Engineering website.

Peter Simmonds, Ph.D., ASHRAE Fellow and DL
Mobile US: +1-310-383-9911
Mobile HKG: +852-9845-4902
Mobile UK: +44 7711 926317

> On Aug 22, 2014, at 6:54 PM, Sambhav Tiwari <tiwari.sambhav at gmail.com> wrote:
>
> Hi Friends,
>                  Is there any mathematical formula which co relates cop of chiller with chilled water temperature and condenser water entering temperature.
>
>
> Warm Regards
> Sambhav
>
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