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HEAT TRANSFER ANALYSIS OF SHELL AND TUBE CONDENSERS WITH SHELL-SIDE ENHANCEMENT.

Author(s) : NAKAYAMA W.

Summary

ENHANCED TUBES CONSIDERED IN THIS PAPER HAVE SMALL SHARP FINS OF ABOUT 1 MM HIGH PROVIDED WITH AN AXIAL PITCH OF 0.7 MM. THEY ARE MADE OF COPPER OR COPPER ALLOYS AND DESIGNED FOR FLUOROCARBON REFRIGERANTS. THE PERFORMANCE OF THIS ENHANCED SURFACE IS SUMMARIZED, INDICATING THAT THE HEAT TRANSFER COEFFICIENT EXCEEDS THAT OF A 18 FPI (7 FINS PER 10 MM) LOW-FINNED SURFACE BY A FACTOR OF 3. IN APPLICATIONS TO SHELL AND TUBE CONDENSERS, DEGRADATION OF HEAT TRANSFER ENHANCEMENT IS EXPECTED BECAUSE OF CONDENSATE INUNDATION IN THE LOWER PART OF A BUNDLE OF HORIZONTAL TUBES. THE EXPERIMENT PRODUCED THE RATIO OF HEAT TRANSFER COEFFICIENTS WITH AND WITHOUT RECEIVING CONDENSATE FLOW FROM ABOVE. THE RATIO LEVELS OFF FOR LARGE INUNDATION RATES AT A LEVEL OF 0.6, BUT THE ENHANCED TUBES MAINTAIN A SUPERIORITY OVER CONVENTIONAL LOW-FINNED TUBES, LEADING TO A REDUCTION OF ABOUT 20% OF REQUIRED AREA, ACCORDING TO A DESIGN ANALYSIS OF A CONDENSER FOR R11.

Details

  • Original title: HEAT TRANSFER ANALYSIS OF SHELL AND TUBE CONDENSERS WITH SHELL-SIDE ENHANCEMENT.
  • Record ID : 1985-1911
  • Languages: English
  • Publication date: 1984
  • Source: Source: ASHRAE Trans.
    vol. 90; n. 1B; 60-71; 8 fig.; 1 tabl.; 10 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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