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ANALYSIS OF ICE FORMATION WITH FLOW REVERSAL FOR APPLICATION TO A WATER SOURCE HEAT PUMP.

Author(s) : ACEVES-SABORIO S. M., REISTAD G. M., NAKAMURA H.

Summary

A NUMERICAL MODEL FORICE FORMATION FROM FLOWING WATER IN A FINNED ANNULAR SECTOR OF AN EVAPORATOR IS DEVELOPED. IT PREDICTS ICE PROFILES AS A FUNCTION OF AXIAL POSITION AND TIME, AND ENERGY TRANSFER VALUES AS A FUNCTION OF TIME. IT ALSO ALLOWS FLOW DIRECTIONREVERSALS IN THE ANNULAR SECTOR. REVERSING THE FLOW DE-ICES THE EVAPORATOR SURFACES BY CAUSING PART OF THE ICE TO MELT OR DETACH FROM THE WALL. THE FLOW REVERSAL METHOD IS SUGGESTED AS AN ALTERNATIVE FOR DE-ICING WITHOUT THE LOSSES COMMONLY ASSOCIATED WITH THE CONVENTIONAL DE-ICING METHODS. THE RESULTS SHOW A LARGE ENERGY TRANSFER GAIN FOR THE REVERSAL CASE AS COMPARED TO THE ENERGY TRANSFER OBTAINED WITHOUT REVERSAL. THE STUDY INCLUDES A THIRD ALTERNATIVE. THIS CONSISTSOF INTERRUPTING THE REFRIGERANT FLOW FOR A FEW SECONDS AFTER EACH REVERSAL, WITH THE PURPOSE OF OBTAINING ADDITIONAL ICE DETACHMENT. OVERALL HEAT TRANSFER RESULTS FOR THIS CASE CLOSELY FOLLOW THOSE FOR REVERSAL WITHOUT REFRIGERANT FLOW INTERRUPTION.

Details

  • Original title: ANALYSIS OF ICE FORMATION WITH FLOW REVERSAL FOR APPLICATION TO A WATER SOURCE HEAT PUMP.
  • Record ID : 1991-0834
  • Languages: English
  • Publication date: 1989
  • Source: Source: ASHRAE Trans.
    vol. 95; n. 2; 366-374; 11 fig.; 2 tabl.; 7 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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