Efficiencies for System 4 – PSZ-HP (packed roof top heat pump)

For a system 4 use the efficiencies from Table 6.8.1B for air cooled heat pumps.

Hi Marcus,

I'm modeling the same system with the size category of <19 kW for cooling and heating mode, the efficiency of this system is in SCOP.

Do you know how do I convert SCOP to COP?

Regards

I can't find SCOP in any of the 6.8.1 tables. Maybe it is a metric thing that I am not familiar with? Could the "S" be seasonal?

The standard is on SI, and the "S" means Seasonal COP. The problem is that to model I need to enter the COP of the system and the standard gives me only the SCOP for systems less than 19 kW (for cooling mode) and less than 40kW (for heating mode) from the table 6.8.1B.

Strange that my IP version of the standard lists COP for heating and not SCOP. I don't have an explanation for why this is so.

For small systems it uses SEER and HSPF. For larger ones it lists EER and COP. Less than 65,000 BTU/h is SEER 13 and 7.7 HSPF. For larger systems it ranges from 9.3 to 11.0 EER.. The COP of 65,000 to 135,000 BTU/h is 3.3 (at 47 d F db) and over 135,000 is 3.2 COP.

Hi Marcus,

Thanks for your help!
To model the project I'm using the E+, which I need to input the COP of the heating and the cooling mode. For system less than 65,000BTU/h, I only have the SEER of 13 (IP)or the SCOP of 3.81 (SI) for cooling mode and for heating mode I have the HSPF of 7.7 or the SCOP of 2.25. How do I set this efficiency on the program?

E+ can't take a SEER or HSPF value?

The ratio of SEER to SCOP and the ratio of HSPF to SCOP is about 3.413 in both cases. 3.413 is the kBTU/kWh.

I am not sure you can convert a seasonal value to a static one.