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DESIGN OF EVAPORATORS FOR LIQUID OVERFEED SYSTEMS.

Author(s) : NELSON B. I.

Summary

UNLIKE < NORMAL > AIR-CONDITIONING EVAPORATOR CALCULATIONS, THE ASSUMPTIONS THAT OVERALL HEAT TRANSFER COEFFICIENT AND SATURATED REFRIGERANT TEMPERATURE ARE CONSTANT OVER THE EVAPORATOR CIRCUIT LENGTH ARE NOT VALID. THEREFORE, CONVENTIONAL LOG MEAN TEMPERATURE DIFFERENCE (AND NTU) PERFORMANCE CALCULATIONS ARE NOT APPROPRIATE FOR LIQUID OVERFEED. THE PAPER PRESENTS AN EVAPORATOR MODEL THAT ACCOUNTS FOR THE PHENOMENON OF CHANGING OVERALL HEAT TRANSFER COEFFICIENT AND COUPLES THE TWO-PHASE PRESSURE DROP WITH ITS ASSOCIATED CHANGE IN REFRIGERANT SATURATION TEMPERATURE TO HEAT TRANSFER. DIFFERENCES IN DESIGN CRITERIA BETWEEN AMMONIA AND R22 ARE DISCUSSED.

Details

  • Original title: DESIGN OF EVAPORATORS FOR LIQUID OVERFEED SYSTEMS.
  • Record ID : 1991-2123
  • Languages: English
  • Publication date: 1990
  • Source: Source: ASHRAE Trans.
    vol. 96; n. 1; 1309-1315; 6 fig.; 2 tabl.; 17 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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