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OIL QUANTITY MEASUREMENTS IN SMOOTH AND MICRO-FIN TUBES DURING EVAPORATION AND CONDENSATION OF REFRIGERANT-OIL MIXTURES.

Author(s) : SCHLAGER L. M., PATE M. B., BERGLES A. E.

Summary

TO DETERMINE IF VISCOUS EFFECTS LEAD TO SIGNIFICANTLY INCREASED OIL CONCENTRATIONS IN TWO-PHASE FLOW REGIONS, EXPERIMENTS WERE RUN THAT DETERMINED THE QUANTITY OF OIL IN SMOOTH AND MICRO-FIN TEST SECTIONS DURING EVAPORATION AND CONDENSATION OF R22 AND OIL MIXTURES. PARAMETERS INCLUDED MASS FLUX (100 TO 300 KG/M2.S), OIL CONCENTRATION (1.2 TO 5.0 %), VISCOSITY (150 AND 300 SUS), EVAPORATION EXIT CONDITIONS 80 TO 85 % QUALITY ; (10 TO 15 K) ABOVE THE SATURATION TEMPERATURE OF PURE REFRIGERANT), AND EVAPORATION PRESSURE (0.5 AND 0.8 MEGAPASCAL). THE QUANTITY OF OIL IN THE TUBES WAS PROPORTIONAL TO, BUT HIGHER THAN, THE FLOWING OIL CONCENTRATION. FOR EXAMPLE, THE AVERAGE OIL CONCENTRATION IN THE EVAPORATOR, APPROXIMATELY 3 TIMES THE SYSTEMAVERAGE, WHILE THE CONDENSER CONCENTRATION WAS ABOUT THE DOUBLE THAT OF THE SYSTEM.

Details

  • Original title: OIL QUANTITY MEASUREMENTS IN SMOOTH AND MICRO-FIN TUBES DURING EVAPORATION AND CONDENSATION OF REFRIGERANT-OIL MIXTURES.
  • Record ID : 1992-0525
  • Languages: English
  • Publication date: 1990
  • Source: Source: ASHRAE Trans.
    vol. 96; n. 2; 465-469; 7 fig.; 1 tabl.; 11 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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