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APPENDIX C ANALYSIS OF EVAPORATIVE COOLING AND ENHANCEMENT OF CONDENSER EFFICIENCY AND OF COEFFICIENT OF PERFORMANCE* ¥. Leidenfrost and B. Korenic West Lafayette, Indiana U.S.A. ABSTRACT. The graphical method to determine with the aid of a Mollier i-x diagram (psychrometric chart) combined heat and mass transfer is simulatedbyacomputerprogram. Heatrejectionratesfromaplate- fin tube type condenser are determined for various flow rates and inlet state conditions of air and for different degrees of wetting of the heat transfer surfaces. The presence of water and the cool ing by latent heat makes it possible to exchange more heat than the unwetted exchanger would even for idealized conditions of infinite heat transfer coefficient of the air. The evaporative cooled con denser also can exchange heat with ambient air which has much higher temperaturethanthecondensingfluid. Evaporativecoolingincreases heat transfer by a factor of more than three for saturated inlet air and greater than five for lower inlet humidities. Wetted heat ex changers require less extended surfaces and can operate effectively with bare tubes only. Wetting the condenser of a refrigeration or heat pump system makes it possible to exchange the condenser load at lower temperatures. This yields an increase of COP of the order of 30 to 60j5 and therefore a substantial decrease in compressor power and its energy consumption. To be published in "WSrme-und Stoffiibertragung" Volume 11, Springer-Verlag, 1978. *In honor of Prof. Dr. F. Bosnjakovic to his 75th Birthday. The article includes in part the M.S. Thesis of the second author.PDF Image | Development of the Zinc-Chlorine Battery for Utility
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