Heat Transfer and Flow Resistance of a Shell and Plate-Type Evaporator
Tóm tắt
The performance test of a shell-and-plate-type evaporator designed for OTEC plants, geothermal power plants, and heat pump systems is reported. This evaporator contains 30 plates with a unit area of 0.813 m2, coated with aluminum powder on the working fluid side. Freon 22 is used as working fluid. Results show an overall heat transfer coefficient of about 5000 W/(m2K) when the heating water velocity is 1 m/s. The mean boiling heat transfer coefficient is compared with a previous correlation proposed by Nakaoka and Uehara (1988). The water-side pressure loss is also reported.
Từ khóa
Tài liệu tham khảo
Nakaoka T. , and UeharaH., 1988, “Performance Test of a Shell-and-Plate Type Evaporator for OTEC,” Experimental Thermal and Fluid Science, Vol. 1, pp. 283–291.
Nishikawa K. , and FujitaY., 1977, Correlation of Nucleate Boiling Heat Transfer Based on Bubble Population Density, Int. J. Heat Mass Transfer, Vol. 20, pp. 233–245.
Panchal, C. B., and Hillis, D. L., 1984, “OTEC Performance Tests of the Alfa-Laval Plate Heat Exchanger as an Ammonia Evaporator, ANL/OTEC-PS-13.
Uehara H. , KusudaH., MondeM., and NakaokaT., 1984a, “Shell-and-Plate-Type Heat Exchangers for OTEC Plants,” ASME JOURNAL OF SOLAR ENERGY ENGINEERING, Vol. 106, pp. 286–290.
Uehara H. , NakaokaT., and HagiwaraK., 1984b, “Plate Type Condenser (Cold Water Side Heat Transfer Coefficient and Friction Factor),” REFRIGERATION, (in Japanese), Vol. 59, pp. 3–9.
Uehara H. , DilaoC. O., and NakaokaT., 1988, “Conceptual Design of Ocean Thermal Energy Conversion (OTEC) Power Plants in The Philippines,” Solar Energy, Vol. 41, pp. 431–441.