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ASHRAE 90.1/2010 G3.1.3.12 Interpretation

asked 2020-01-14 08:42:30 -0500

crisrossatto gravatar image

updated 2020-01-15 11:24:06 -0500

Hi, I'm new in energy modelling and I received a note from a energy model reviewer (LEED) regarding my Baseline energy model that is supposed to be in accordance with Section G3.1.3.12 ASHRAE 90.1/2010. The G3.1.3.12 says : Supply Air Temperature Reset (Systems 5 through 8). The air temperature for cooling shall be reset higher by 5°F under the minimum cooling load conditions. My baseline model is a system 7 and 8, and the building type is a full service restaurant. I had some doubts about the Section G3.1.3.12 interpretation, it's related to the setpoit manager? Can I use the setpoint manager warmest with the difference between minimum setpoint temperature and maximum setpoint temperature being 5°F?

Any help is appreciated

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@crisrossatto what modeling tool are you using? You can include a tag for that tool as well so that others can help you better.

Aaron Boranian gravatar image Aaron Boranian  ( 2020-01-14 13:40:47 -0500 )edit

I am using DesignBuilder

crisrossatto gravatar image crisrossatto  ( 2020-01-14 13:45:12 -0500 )edit

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answered 2020-01-15 07:08:40 -0500

updated 2020-01-15 12:54:27 -0500

You can use the SetpointManager:Warmest to comply with the requirement.

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Thank you for your answer. What are the correct values that I have to set in minimum setpoint temperature and maximum setpoint temperature for the warmest setpoint manager?

crisrossatto gravatar image crisrossatto  ( 2020-01-15 07:46:32 -0500 )edit

The minimum is 20°F under your space cooling setpoint (17°F for labs), and the maximum is that temperature plus 5°F. An example, if your cooling setpoint is 75°F your minimum SAT would be 55°F and the maximum 60°F. Please mark the question as correct, if applicable.

Luis Lara gravatar image Luis Lara  ( 2020-01-15 12:50:58 -0500 )edit

Thanks a lot. It was very helpful

crisrossatto gravatar image crisrossatto  ( 2020-01-16 04:55:34 -0500 )edit

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Asked: 2020-01-14 08:42:30 -0500

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Last updated: Jan 15 '20