How are BEopt EER/COP used in energy calculation?

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)

link

Comments

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 ( 2 years ago )

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.