System performance comparison of R-507 with R-502
- National Research Council Canada, Ottawa, Ontario (Canada). Inst. for Environmental Research and Technology
R-507 is an azeotrope of HFC-125/HFC-143a (50%/50%) and is a long-term, zero ozone depletion potential (ODP) replacement for CFC-containing low-temperature refrigerant R-502. A series of system performance tests has been completed comparing R-507 with R-502. The tests were carried out under controlled conditions in a well-instrumented alternative refrigerants test facility, using an open-drive reciprocating compressor and counterflow tube-in-tube heat exchangers. Measurements were conducted at two different condensing temperatures; 54.4 C (130.0 F) and 43.3 C (110.0 F). The refrigerant evaporating temperature was varied over a range of {minus}30.0 C to {minus}15.0 C ({minus}22.0 F to 5.0 F). The degree of liquid subcooling at the condenser outlet was varied between 6.0 C and 18.0 C (10.8 F and 32.4 F). Test data were used to compare important compressor performance characteristics including shaft power, pressure ratio, and compressor discharge temperature. System performance characteristics were also measured, including evaporator capacity, refrigerant mass flow, and cooling coefficient of performance (COP). The effect of additional liquid subcooling on the evaporator capacity and COP was also evaluated. The relative evaporator capacity of R-507 compared to R-502 was found to range from 0.95 to 1.05, depending on the operating conditions and the amount of liquid subcooling present. For all the conditions tested, R-507 was less energy efficient than R-502. The relative COP of R-507 ranged from 0.87 to 0.97.
- OSTI ID:
- 211821
- Report Number(s):
- CONF-950624-; TRN: IM9617%%137
- Resource Relation:
- Conference: Annual meeting of the American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc. (ASHRAE), San Diego, CA (United States), 24-28 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of ASHRAE transactions 1995: Technical and symposium papers. Volume 101, Part 2; PB: 1497 p.
- Country of Publication:
- United States
- Language:
- English
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