[Equest-users] ASHRAE baseline EF for service hot water heater

[Harshal Gupta]

Hello All,

Project Details
I have an issue for conversion of EF to COP of service hot water heater.
Their is a service hot water heater installed in my project of 2000 L or 528 US gallons capacity. Heater is equipped with a re circulation pump of 4kW.

Modeling Issue
As per ASHRAE 90.1 base case the minimum efficiency to be considered in base case as per table 7.8. Minimum efficiency  formula as per table is 0.93-.00132 √V EF.
With the above formula considering V as 528 US gallons Energy Factor (EF) will be 0.233. In many articles it was marked COP is 1/EF, by this statement COP will be 4.299.
This is giving me the negative savings.

Can any one help me with correct process for conversion of EF to COP.
Secondly, what should be pump power in base case?

Thanks in Advance

[cid:9b04a961-d79b-43b3-9d71-60b59107130d]

Warm Regards
Harshal Gupta
Energy Analyst

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