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Unmet heating and cooling hours question

asked 2018-05-08 14:06:43 -0500

Arch2010 gravatar image

updated 2018-05-08 22:46:56 -0500

I'm experimenting with energy modeling using Openstudio through Honeybee. I modeled a building and I used the ideal air load system. I got some unmet heating and cooling hours. Shouldn't an ideal air load system yield 0 unmet heating and cooling hours considering it is ideal (energy coming in the zone = energy going out of the zone)? Am I misunderstanding something here!

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@Arch2010 could you post a link to your model?

Avi gravatar image Avi  ( 2018-05-09 10:48:49 -0500 )edit

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answered 2018-05-09 07:32:33 -0500

The ZoneHVAC:IdealLoadsAirSystem can also be used to model a real system. For "ideal" modeling make sure the inputs for Cooling Limit and Heating Limit are set to "NoLimit" and that the Cooling/Heating Availability Schedule input fields are blank (always available). If this still produces unmet hours, plot zone temp, zone set point temperature and unmet hours reports (then zoom in on a few days) to see when this is happening.

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@rraustad, I didn't know that I have to set the cooling and heating limit to no limit. Thanks!

Arch2010 gravatar image Arch2010  ( 2018-05-13 14:49:43 -0500 )edit

answered 2018-05-09 01:44:35 -0500

TomB gravatar image

Check the occupancy schedule versus HVAC schedule

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Asked: 2018-05-08 14:06:43 -0500

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Last updated: May 09 '18