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Unmet heating hours

asked 2016-04-28 10:06:22 -0500

shahin1992 gravatar image

updated 2016-04-28 12:30:55 -0500

is it possible that the unmet heating hours are more in the case of using shading system but the heating load is less?

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Welcome @shahin1992. Please tag your questions with the software you're using and use existing tags whenever possible. Thanks!

MatthewSteen gravatar imageMatthewSteen ( 2016-04-28 10:34:54 -0500 )edit

thanks very much for your reply and sorry for not tagging the software. i'm using OpenStudio

shahin1992 gravatar imageshahin1992 ( 2016-04-28 10:55:54 -0500 )edit

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answered 2016-04-29 07:32:16 -0500

Archmage gravatar image

Yes, there are scenarios where that could be the case. For example a central air reheat system where the reheat coils are not sized large enough. The solar gains act like reheat, until they don't because of the shade. If the heating load is small compared to the reheating load, the reheat coils might be sized too small to meet the heating setpoint. The window shades may decrease window U-value some, and I guess that is why you say you have less heating load, but that can be a small change in a small heating load compared to the power needed to reheat cold air from a terminal unit during times of very low zone heat gain. The solar gains are more significant than the heat lost out the window at night.

We would need a great deal more information on the type of HVAC system and building. As always, look at the time series data and figure out when the unmet hours are occuring.

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Asked: 2016-04-28 10:06:22 -0500

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Last updated: Apr 29 '16