How are BEopt EER/COP used in energy calculation?

answered 2022-10-25 19:55:54 -0600

11991 ●205 ●9 https://www.nrel.gov/b...

Without getting into too much detail, the BEopt HVAC options currently require a lot of detailed inputs to determine the efficiency of the equipment in the EnergyPlus simulation. EER/COP inputs are indeed used in conjunction with SEER/HSPF, rated fan power, etc. You can see how the EnergyPlus inputs change when you vary the BEopt inputs.

We recognize that these inputs can be very challenging for a user to obtain and make it hard to create new BEopt options. With BEopt v3 (beta to be released in mid-December), we are greatly reducing the number/complexity of inputs required.

For example, an air conditioner in BEopt v2 requires:

Number of Speeds
Rated SEER
Installed SEER
EER(s)
Rated SHR(s)
Capacity Ratio(s)
Fan Speed Ratio(s)
Rated Fan Power
Installed Fan Power
Crankcase Power/Temperature

In BEopt v3, the only required inputs will be:

Number of Speeds
Rated SEER
Rated SHR
Fan Power (can be defaulted)

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thanks, Shorowit. Do you happen to have the engineering formula to show how the SEER/HSPF/EER/COP are used to calculate the cooling/heating site energy, delivered energy, etc, especially for variable speed HVAC? thanks

lihao2004 ( 2022-10-26 07:14:17 -0600 )edit

The calculations are pretty involved, it essentially involves reversing the AHRI rating procedures. If you really want to dig in, you can look at the code in the Modeling/sim.py file.