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zero cooling load on summer design day

asked 2018-09-12 12:44:17 -0600

S gravatar image

updated 2018-09-12 15:43:37 -0600

Hello All, I am using autosizing for hvac calculations in EnergyPlus. It gives me zero cooling load on summer design day. However, indoor temperature is much higher than the cooling setpoint on summer design day. The same day (i.e. summer design day) in the annual simulation is good (i.e. there is cooling load and indoor temperature is lower than the cooling setpoint). Any help would be appreciated.

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what hvac equipment are you using, and what schedules are you using for the design day?

mdahlhausen gravatar imagemdahlhausen ( 2018-09-12 15:26:07 -0600 )edit

My terminal HVAC units are VAV boxed. I am using standard schedules (i.e. there are internal heating gains from people, lights and electric equipment on summer design day). However, there is no cooling load (and no chiller electric power) on summer design day while indoor temperature is much higher than the cooling setpoint. But in the output table file, it shows that the nominal capacity of the chiller is calculated based on system sizing calculations.

S gravatar imageS ( 2018-09-12 18:08:53 -0600 )edit

@S could you post a link to your idf file?

Avi gravatar imageAvi ( 2018-09-13 01:05:10 -0600 )edit

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answered 2018-09-14 15:46:33 -0600

It's a system availability schedule problem. See answer here.

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Asked: 2018-09-12 12:44:17 -0600

Seen: 67 times

Last updated: Sep 14