Location of Preheat coil

asked 2026-02-12 21:47:58 -0500

Keigo's avatar

I'd like to confirm the location of a preheat coil which is required for ASHRAE PRM Baseline Systems 5 through 8 as per 90.1-2016 G3.1.3.19, 90.1-2019 G3.1.3.19 and 90.1-2022 G3.2.3.19.

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ASHRAE 90.1 and ASHRAE 90.1 User's Manual do not explicitly state the location of the preheat coil.

PNNL's Reference Manual suggests that the preheat coil shall be located in the mixed air stream i.e. after the outdoor air and return air are mixed, but I don't fully trust the refernce manual. It sometimes makes mistakes. image description

In the EnergyPlus documentation, "preheat" refers to heating the outdoor air. A preheat coil is located in the outdoor air stream.

Which location is correct for ASHRAE 90.1 PRM? Any source? Just an opinion would be appreciated.

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