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HYSTERESIS IN TWO-PHASE THERMOSIPHON LOOP HEAT EXCHANGERS.

Author(s) : GE D., MCDONALD T. W., MATHUR G. D.

Summary

IN AN EXPERIMENTAL STUDY IT WAS FOUND THAT, FOR AN R11/COPPER INTERFACE, A HOT DUCT TO COLD DUCT TEMPERATURE DIFFERENCE OF 16 TO 17 K WAS REQUIRED TO INITIATE BOILING FOR OPERATING PRESSURES BETWEEN 120 AND 160 KILOPASCALS. ONCE INITIATED, BOILING WAS SUSTAINED UNTIL THE AIR-TO-AIR TEMPERATURE DIFFERENCE DECREASED TO 4 K. THIS HYSTERESIS BEHAVIOUR WAS EXHIBITED WHEN OPERATING WITH TEMPERATURE DIFFERENCES BELOW 50 K. UPON REHEATING, IN THIS REGION, A PORTION OF THE NUCLEATION SITES PREVIOUSLY MADE INACTIVE REACTIVATED EASILY WHEREAS OTHERS WERE COMPLETELY QUENCHED. GOOD AGREEMENTWITH THE EXPERIMENTAL RESULTS IN THE HYSTERESIS REGION COULD BE ACHIEVED BY USING A SIMPLE QUENCH-DORMANCY MODEL.

Details

  • Original title: HYSTERESIS IN TWO-PHASE THERMOSIPHON LOOP HEAT EXCHANGERS.
  • Record ID : 1988-2255
  • Languages: English
  • Publication date: 1987
  • Source: Source: ASHRAE Trans.
    vol. 93; n. 2; 275-281; 9 fig.; 2 tabl.; 9 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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