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My chiller capacity is 133% higher than the OpenStudio design cooling load to meet the zone set point temperature. Why there is a big difference and Why the zone set point temperature is not met at the design cooling load?

asked 2020-01-29 06:12:00 -0500

Prasanth M's avatar

updated 2020-01-29 06:24:13 -0500

I am modelling a existing 12 storey office building. For validation purpose, I conditioned only 10th floor with actual cooling load and internal heat gains. I took water cooled chiller for my simulation. The OpenStudio design cooling load of 10th floor is 63 kW. My actual cooling load is 147 kW. I hard sized the chiller capacity as 147 kW, hence the zone set point temperature was met. If I take OpenStudio design cooling load of 63 kW as my chiller capacity, the zone setpoint temperature was not met. I assumed wall and window material properties with reasonable accuracy.

Please clear my doubts.

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answered 2020-01-31 20:46:14 -0500

Looks like you have a classic case of unmet hours. Follow the process outline in the answers to this question to see what might be the cause.

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Thank you Mr. Andrew Parker for your kind reply.

Prasanth M's avatar Prasanth M  ( 2020-02-02 22:20:27 -0500 )edit

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Asked: 2020-01-29 06:12:00 -0500

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Last updated: Dec 19 '20