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Properties and Cycle Performance of Refrigerant Blends Operating Near and Above the Refrigerant Critical Point. Task 2: Air Conditioner System Study. Final Report.


pdf icon Properties and Cycle Performance of Refrigerant Blends Operating Near and Above the Refrigerant Critical Point. Task 2: Air Conditioner System Study. Final Report. (17325 K)
Domanski, P. A.; Payne, W. V.

ARTI-21CR/605-50010-01-Pt. 2; 151 p. September 2002.

Sponsor:

Department of Energy, Washington, DC

Available from:

: National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900; Rush Service (Telephone Orders Only) 800-553-6847;
Website: http://www.ntis.gov

Keywords:

refrigerants; air conditioning; alternative refrigerants; condenser; efficiency; evaporator; simulation models; vapor compression system

Abstract:

The main goal of this study was to investigate performance of R410A air conditioner relative to an R22 air conditioner, with specific interest in performance at high ambient temperatures at which the condenser of the R410A system may operate above the critical point. The study comprised experimental and modeling efforts. Within the experimental part of the study we tested split system 3-tom R22 and R410A residential air conditioners. The selected systems comprised identical evaporators and condensers, respectively, and were equipped with thermostatic expansion valves (TXVs). We tested the R22 air conditioner in the 82.0 dec F to 135.0 deg F (27.8 deg C to 57.2 deg C) outdoor temperature range. We planned the same range of ambient temperatures for the R410A system, however, the R410A compressor's safety system cut off the compressor at 135.0 deg F (57.2 dec C) outdoor temperature, and the 130.0 deg F (54.4 deg C) test was the highest temperature at which measurements were taken with the original R410A compressor. Subsequently, a custom-manufactured R410A compressor was installed in which the safety system was disabled and the electric motor was more powerful than in the original compressor. With this new compressor, we took data at up to 155.0 deg F (68.3 deg C) ambient temperature, at which the system operated in a transcritical mode.