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A COMPARISON OF 150 AND 300 SUS OIL EFFECTS ON REFRIGERANT EVAPORATION AND CONDENSATION IN A SMOOTH TUBE AND A MICRO-FIN TUBE.

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

Summary

THE REFRIGERANT WAS R22 AND THE OIL WAS A 300 SUS NAPHTHENIC MINERAL OIL. THE TEST SECTION WAS A STRAIGHT, HORIZONTAL TUBE. NOMINAL TEST CONDITIONS WERE 276 K (3 DEG C) DURING EVAPORATION AND 314 K (41 DEG C) DURING CONDENSATION. MASS FLUXES WERE VARIED FROM 125-400 KG/M2.S AND THE OIL CONCENTRATION WAS VARIED FROM 0 TO 5% BY WEIGHT. THERE WASNO SIGNIFICANT ENHANCEMENT OF EVAPORATIVE HEAT TRANSFER WITH 300 SUS OIL. IN GENERAL, THE HEAT TRANSFER WAS DEGRADED IN BOTH TUBES, WITH THE GREATEST OBSERVED DEGRADATION AT OIL CONCENTRATION OF 5%. THE MAXIMUM DECREASE WAS ABOUT 30% FOR THE MICRO-FIN TUBE AND ABOUT 20% WITH THE SMOOTH TUBE. AT 5% OIL CONCENTRATION, THE DECREASE RANGED FROM ABOUT 10% WITH THE SMOOTH TUBE TO 20% WITH THE MICRO-FIN TUBE.

Details

  • Original title: A COMPARISON OF 150 AND 300 SUS OIL EFFECTS ON REFRIGERANT EVAPORATION AND CONDENSATION IN A SMOOTH TUBE AND A MICRO-FIN TUBE.
  • Record ID : 1990-2298
  • Languages: English
  • Publication date: 1989
  • Source: Source: ASHRAE Trans.
    vol. 95; n. 1; 387-397; 12 fig.; 3 tabl.; 19 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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