The Impact of Refrigerant Charge, Air Flow and Expansion Devices on the Measured Performance of an Air-Source Heat Pump Part I

Journal Article · Sat Jan 01 00:00:00 EST 2011 · ASHRAE Transactions

OSTI ID:1039948

Shen, Bo ^[1]

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1. ORNL

This paper describes extensive tests performed on a 3-ton R-22 split heat pump in heating mode. The tests contain 150 steady-state performance tests, 18 cyclic tests and 18 defrost tests. During the testing work, the refrigerant charge level was varied from 70 % to 130% relative to the nominal value; the outdoor temperature was altered by three levels at 17 F (-8.3 C), 35 F (1.7 C) and 47 F (8.3 C); indoor air flow rates ranged from 60% to 150% of the rated air flow rate; and the expansion device was switched from a fixed-orifice to a thermal expansion value. Detailed performance data from the extensive steady state cyclic and defrost testing performed were presented and compared.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1039948
• Journal Information: ASHRAE Transactions, Vol. 117; ISSN 0001-2505
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AIR FLOW
AIR SOURCE HEAT PUMPS
HEAT PUMPS
HEATING
INDOORS
OUTDOORS
PERFORMANCE
REFRIGERANTS
TESTING
THERMAL EXPANSION
Heat Pumps
Coils
Valves
Laboratory Testing
Refrigerant Charge