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EVAPORATION AND CONDENSATION OF REFRIGERANT-OIL MIXTURES IN A LOW-FIN TUBE.

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

Summary

EVAPORATION AND CONDENSATION OF R22-OIL MIXTURES WERE STUDIED INSIDE A LOW-FIN TUBE AND COMPARED WITH EARLIER RESULTS FOR SMOOTH TUBE AND MICRO-FIN TUBE TESTS. THE OIL WAS A 150 SUS NAPHTHENIC MINERAL OIL. THE TEST SECTION WAS A STRAIGHT, HORIZONTAL TUBE. THE MASS CONCENTRATION OF THE OIL WAS VARIED FROM 0 TO 5%, AND MASS FLUXES WERE VARIED FROM 125-400 KILOGRAMMES/M2 S. NOMINAL EVAPORATION CONDITIONS WERE 276 K (3 DEG C) WITH INLET AND OUTLET QUALITIES OF 15 AND 85%, RESPECTIVELY. NOMINAL CONDITIONS FOR CONDENSATION WERE314 K (41 DEG C) WITH INLET AND OUTLET QUALITIES OF 85 AND 15%, RESPECTIVELY. FOR PURE REFRIGERANT, THE LOW-FIN TUBE ENHANCED EVAPORATIVE HEAT TRANSFER BY A FACTOR AS HIGH AS 2.5 BUT THE ENHANCEMENT RELATIVE TO THE SMOOTH TUBE DECREASEDAS OIL WAS ADDED. CONDENSATION HEAT TRANSFER WAS ENHANCED BY A FACTOR AS HIGH AS 2.2 WITH PURE REFRIGERANT, AND THE ENHANCEMENT RELATIVE TO THE SMOOTH TUBE TENDED TO INCREASE AS OIL WAS ER PERFORMANCE OF THE LOW-FIN TUBE WAS APPROXIMATELY 10 TO 15% BELOW THAT OF THE MICRO-FIN TUBE OVER THE RANGE OF OIL CONCENTRATIONS TESTED.

Details

  • Original title: EVAPORATION AND CONDENSATION OF REFRIGERANT-OIL MIXTURES IN A LOW-FIN TUBE.
  • Record ID : 1989-2192
  • Languages: English
  • Publication date: 1988
  • Source: Source: ASHRAE Trans.
    vol. 94; n. 2; 1176-1194; 14 fig.; 3 tabl.; 19 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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