[Equest-users] Appendix G Baseline for a Hybrid Fuel Source DHW plant

[Molly Curtz]

I'm working on a LEED project where we are considering an air-source heat pump domestic hot water plant with gas boiler backup for low temperatures where the heat pump capacity drops off. Appendix G of ASHRAE 90.1 does not seem to give guidance as to what baseline should be used (gas or electric resistance) for such a hybrid system. Has anyone encountered this before?

Thanks in advance for any suggestions!

Kind regards,

Molly


Molly Curtz PE BEMP LEED AP BD+C
Senior Mechanical Engineer

Arup
719 Second Avenue  Suite 400 Seattle WA 98104
t +1 206 749 9674  d +1 206 493 2234
f +1 206 749 0665
www.arup.com<http://www.arup.com/>

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