The impact of charge on the cooling performance of an air-to-air heat pump for R-22 and three binary blends of R-32 and R-134a
- Young Life, Navasota, TX (United States)
- Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
An experimental study was conducted in which the performance of three blends of R-134a and R-32 was compared to that of R-22. The effect of refrigerant charge on the performance of these refrigerants in an air-to-air heat pump operating in the cooling mode was quantified The mixtures consisted of 40%/60%, 30%/70%, and 20%/80% ratios (by mass) of R-32 and R-134a. Charge levels of 5.00, 5.45, 5.90, and 6.00 kg (11, 12, 13, and 14 lb) were tested. At each charge level, outdoor room conditions of 27.8 C, 35.0 C, and 40.6 C (82 F, 95 F, and 105 F) were tested The expansion device for all tests was a 1.96 mm (0.077 in.) diameter orifice. Three variables were used to quantify refrigerant performance-total capacity, total electrical power consumption, and coefficient of performance (COP). The performance of the heat pump with any of the three mixtures was not as good as with R-22. The capacities were between 7% and 17% less than with R-22. The best COPs with the mixtures were within 3% of that with R-22 in some cases, but the corresponding capacities at these COPs were approximately 12% lower than that in the R-22 base case. The best results for a mixture were with the 40%/60% blend. The capacity was 7.3% less than the base case and the COP was 8.5% lower.
- OSTI ID:
- 33272
- Report Number(s):
- CONF-9406105-; TRN: IM9518%%93
- Resource Relation:
- Conference: 1994 American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) annual meeting, Orlando, FL (United States), 25-29 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of ASHRAE transactions 1994: Technical and symposium papers. Volume 100, Part 2; PB: 1372 p.
- Country of Publication:
- United States
- Language:
- English
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