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NC-v4 EAp2:Minimum energy performance

Baseline Design Supply Airflow Rate Temperature Difference 90.1-10 para. G3.1.2.9.1

Hello,

I have a qeustion regarding ASHRAE 90.1-10, paragraph G3.1.2.9.1 which states that for baseline systems 1through 8, design supply airflow rates for the baseline building shall be based on a supply-air-to-room-air temperature difference of 20°F.  This makes sense for heating to help prevent stratification, but the paragraph does not specify that it only apply to heating airflow.  My question is, if my design coil LAT is 55°F, but my cooling design temp is 78°F for the proposed system, should I reset the thrmostat to 75°F, or should I bring up the coil temp to 58°F (even though in reality I could end up with humidity problems), on the baseline system to comply with the prescribed 20°F temperature difference?

Thanks,
Mike Callan, PE

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Tue, 04/12/2022 - 13:47

The space temperature setting (78°F) must remain identical between the Baseline and Proposed Case. The Baseline cooling supply air temperature should be 58°F.

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