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EFFECTS OF OUTDOOR COIL FAN PRESTART ON PRESSURE TRANSIENTS DURING THE REVERSE CYCLE DEFROST OF A HEAT PUMP.

Author(s) : ANAND N. K.

Summary

AT THE TERMINATION OF A TYPICAL DEFROST PERIOD, THE HIGH-PRESS UREREFRIGERANT IN THE OUTDOOR COIL IS EXPOSED TO THE LOW-PRESSURE SUCTION LINE OF THE COMPRESSOR, AND THE LOW-PRESSURE REFRIGERANT IN THE INDOOR COIL IS EXPOSED TO THE HIGH-PRESSURE DISCHARGE LINE OF THE COMPRESSOR. A SUDDEN RISE AND FALL OF PRESSURE IS EXPERIENCED IN THE COMPRESSOR SUCTION LINE, AND A SUDDEN FALL AND RISE OF PRESSURE IN THE DISCHARGE LINE. SUCH PRESSURE TRANSIENTS SUBJECT THE COMPRESSOR AND THE REFRIGERANT LINES TO A MECHANICAL SHOCK, WHICH IS DETRIMENTAL TO THE RELIABILITY. BY STARTING THE OUTDOOR COIL FAN PRIOR TO TERMINATION OF THE DEFROST CYCLE, THE OUTDOOR COIL WAS COOLED AND PRESSURE TRANSIENTS AT THE DEFROST TERMINATION WERE REDUCED. THE INVESTIGATION SHOWED THE 20-SECOND FAN PRE-START TO BE IDEAL FOR REDUCING THE PRESSURE TRANSIENTS.

Details

  • Original title: EFFECTS OF OUTDOOR COIL FAN PRESTART ON PRESSURE TRANSIENTS DURING THE REVERSE CYCLE DEFROST OF A HEAT PUMP.
  • Record ID : 1991-0377
  • Languages: English
  • Publication date: 1989
  • Source: Source: ASHRAE Trans.
    vol. 95; n. 2; 699-704; 9 fig.; 1 tabl.; 8 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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