Properties and Cycle Performance of Refrigerant Blends Operating Near and Above the Refrigerant Critical Point. Task 2: Air Conditioner System Study. Final Report.
Properties and Cycle Performance of Refrigerant Blends
Operating Near and Above the Refrigerant Critical Point.
Task 2: Air Conditioner System Study. Final Report.
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.
1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900; Rush
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refrigerants; air conditioning; alternative
refrigerants; condenser; efficiency; evaporator;
simulation models; vapor compression system
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.