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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

LEED/ASHRAE definition of a preheat coil?

Rock Ridolfi

Associate

Engineering Economics, Inc.

LEEDuser Expert

7 thumbs up

Project location :

April 22, 2015

The proposed system includes an ERV serving two packaged rooftop units. In the proposed, I’d like to eliminate the heating in the rooftop unit planned for morning warm-up operation but keep the heating coil in the baseline. Is the heating coil in the proposed packaged rooftop unit used for morning warm-up considered a preheat coil and therefore required to follow G3.1.2.3 Preheat Coils? TRACE700 schematics identify the preheat coil in the system level to be located in the mixed air stream. I define a preheat coil as one located for outdoor air tempering only, in the pre-mixed air stream. Any guidance is greatly appreciated. - Rock

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 04/23/2015 - 13:26

A preheat coil is generally the first coil that the outside air sees. It could be in mixed or outdoor air streams. There was an old LEED Interpretation (not published anymore) that said that an ERV is essentially the same thing as a preheat coil. So you should be able to model one in the Baseline.

Rock Ridolfi

Associate

Engineering Economics, Inc.

LEEDuser Expert

7 thumbs up

Thu, 04/23/2015 - 13:45

Thanks Marcus, appreciate it.

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