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Turbulent Falling Film Evaporators and Condensers for Open Cycle Ocean Thermal Energy Conversion

A. T. Wassel
Science Applications, Inc., El Segundo, California 90245, USA

Anthony F. Mills
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095, U.S.A.

Abstract

A design methodology has been developed for turbulent falling film evaporators and condensers of Claude open cycle ocean thermal energy conversion power plants. The mathematical model assumes one dimensional flow of liquid and vapor phases, and interphase transfer of momentum, energy and mass species are obtained from correlations which account for high mass transfer rates where appropriate. Parametric calculations have been made for a countercurrent evaporator and a co-current condenser suitable for a 100 MWe power plant. Parameters varied include geometric parameters such as exchanger cross-sectional area, plate spacing and film height, and flow parameters such as liquid and vapor stream flow rates, saturation temperatures, and liquid inlet temperatures.

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