Test Verification of the Standard Compilation of “Energy-Saving Monitoring for Refrigeration Storage System” in Beijing

Table 4

COP calculations of four refrigerants at different storage temperatures.

Refrigerants	R22	R134a	R404A	R717	Average value
Design storage temperature (4°C); evaporation temperature (−6°C)	3.52	3.31	3.06	3.93	3.46
Design storage temperature (−5°C); evaporation temperature (−10°C)	3.12	2.87	2.71	3.34	3.01
Design storage temperature (−18°C); evaporation temperature (−28°C)	1.64	/	1.85	1.74	1.74
Design storage temperature (−25°C); evaporation temperature (−35°C)	1.37	/	1.47	1.42	1.42

The abovementioned data are calculated according to the enthalpy and entropy of refrigerant under different evaporation temperature, suction pressure, condensation temperature, and hydraulic pressure. 2.R134a is not applicable in the low-temperature zone.