Determining COP for BeOpt Heat Pump
Hello!
Background
I'm currently modelling systems in ATL and am trying to better understand how to back out hourly COP values for heat pumps from timeseries data.
Naively I would have thought that I should take the "My Design - End Use: Electricity: Heating (kWh)" output and add it to the "My Design - End Use: Electricity: Heating Fans/Pumps (kWh)" to get the total electricity used for that given time period. We would then divide "My Design - Load: Heating: Delivered (kBtu)" by this value to get the COP (Of course converting kBtu -> kWh first). I modeled these with ducts in conditioned spaces for minimal duct losses if that makes a difference.
If I do this, I get COP values that are well above what I would expect for a heat pump under given ambient temperatures, for example a COP of 4 at 30F and 6 at 55F. The average COP for ATL across the year was 4.11, which seems very high for a relatively cold city.
Question
It seems I am incorrectly calculating the COP - how do I back out the Heat Pump COP from the timeseries data?
Thank you in advance!
