[TRNSYS-users] TYPE 666 Chiller Queries

[#YEO KEAT KEE#]

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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