[Equest-users] Cooling hours unmet

[Furey, Patrick]

I’m having a problem with unmet throttling hours, and I can’t find any
way to remedy it. I’d appreciate any help anyone can offer.

 

Building Description: A school with an air cooled chiller, boilers, 5
ahu’s with hot and cold coils, and hw reheat at the VAV boxes. The model
also has baseboards in a few spots and a run around energy recovery on
each AHU. 

 

I am working on an energy model put together by someone who no longer
works here. When I run the simulation on his model, I get about 76% of
the hours outside of throttling range, all cooling. Following advice
I’ve found in the archives, I increase my throttling range from 2 to 6
degrees. That brings the hours out of throttling range down to 34%,
again all cooling. Night fan control is set to cycle on any. Increasing
the sizing factor from 1.25 only help very minimally (1-2 % points).
I’ve been messing around with the model, trying different strategies for
days and can’t get it in an acceptable range. I’ve attached the project
files if anyone could take a look at it.

 

My biggest problem is when the system is sized per the calculated loads,
how am I getting so many hours where the system is not meeting the
loads.

 

Anyway, thanks.

 

Pat Furey


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