[TRNSYS-users] TYPE 666 Chiller Queries

[Jeff Thornton]

Well if you look carefully at your plots, power is not "almost
constant". Change the scale of the power plot and you'll see the spikes
that you are observing in your COP. Have you spot-checked your
performance map by running the chiller at "known conditions" and seeing
that you're getting out of your model what you are expecting? 

Jeff


---

Jeff Thornton 

_President - TESS LLC_ 

_22 N. Carroll Street,
Madison WI USA 53703_ 

_Office: (608) 274-2577 Fax: (608) 278-1475_


_www.tess-inc.com_ 

_E-Mail: thornton at tess-inc.com_ 

On 03/26/2013
10:44 pm, #YEO KEAT KEE# wrote: 

> Dear Fellow Trnsys Users, 
> 
> I am
running a parametric study using the TYPE 666 Chiller and I have some
unexplainable observations with regards to the Chiller COP. 
> 
> It
seems that the chiller COP has a lot of unexplainable spikes and
fluctuations throughout the simulated year. 
> 
> This is observed
despite 
> 
> 1. An almost constant part load ratio (load) handled by
the chiller. 
> 
> 2. Entering Condenser Water Temperature to the
chiller remains almost constant, with little fluctuations. 
> 
> 3.
Power consumed by the chiller remaining almost constant. 
> 
> I
understand that in TRNSYS, COP=Qmet/P, if both the Qmet and P are
relatively constant, what could be causing the spike observed in the COP
? 
> 
> I have attached some screen shots from the results of my
simulation. 
> 
> Has anyone encountered the same situation before ? Or
any advice on why this is happening ? 
> 
> Best Regards, 
> 
> Yeo
 
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