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Chiller Evaporator Cooling Rate

asked 2023-08-16 02:21:55 -0500

Om
49 ●6

updated 2023-08-16 09:12:10 -0500

flag of United States of America

13830 ●76 ●24 http://bigladdersoftware.com/

Hi,

I model a building in OpenStudio and try to compare the hourly chiller evaporator cooling rates between actual and modeled chillers. It seems like the modeled outputs have jumping values during the first hours as shown in the chart. I use the OS:Chiller:Electric:EIR class to model the chillers. I am not sure whether this is common or it's an error from my inputs. Could anyone please recommend some methods to deal with these first-hour spikes?

Thank you.

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answered 2023-08-16 11:29:22 -0500

flag of Colombia

1378 ●13 ●13

It seems to me that there is a thermal inertia at the beginner of each day in the modeled chiller. The modeled chiller has to work more to overcome this load and then cooling demand it is less than the Actual one.

It could be interesting if the area under the curve (cooling energy) of each case is the same.

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Asked: 2023-08-16 02:21:55 -0500

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Last updated: Aug 16 '23

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