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A COMPARISON OF ORIFICE AND THERMAL EXPANSION VALVE CONTROL CHARACTERISTICS DURING THE REVERSE-CYCLE DEFROST.

Author(s) : O'NEAL D. L., PETERSON K.

Summary

THE OBJECTIVE OF THERESEARCH WAS TO CHARACTERIZE THE DIFFERENCES IN THE DYNAMIC RESPONSE OF A HEAT PUMP DURING THE REVERSE CYCLE DEFROST FOR 2 EXPANSION DEVICES: AN ORIFICE AND A THERMAL EXPANSION VALVE. AN EXPERIMENTAL APPARATUS WAS CON-STRUCTED AND EXPERIMENTS PERFORMED. THE TEST SET-UP CONTAINED A NOMINAL 3-TON-CAPACITY RESIDENTIAL AIR-TO-AIR HEAT PUMP. A MANIFOLD WAS CONSTRUCTED WHICH ALLOWED FOR SWITCHOVER OF DEFROST EXPANSION DEVICES WITH THE TURNING OF A SHUTOFF VALVE. REFRIGERANT TEMPERATURE AND PRESSURE MEASUREMENTS WERE MADE THROUGHOUT THE SYSTEM AS WELL AS REFRIGERANT FLOW RATES, AIR-SIDE CAPACITY, COMPRESSOR/OUTDOOR FAN POWER, AND REFRIGERANT LEVEL IN THE ACCUMULATOR.

Details

  • Original title: A COMPARISON OF ORIFICE AND THERMAL EXPANSION VALVE CONTROL CHARACTERISTICS DURING THE REVERSE-CYCLE DEFROST.
  • Record ID : 1991-1335
  • Languages: English
  • Publication date: 1990
  • Source: Source: ASHRAE Trans.
    vol. 96; n. 1; 337-343; 8 fig.; 2 tabl.; 6 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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