Complete condensation of binary mixtures of R11-R114 refrigerants is experimentally and theoretically studied. The test apparatus consists of two concentric tubes, with the vapor mixture flowing downward in the inner tube and the cooling water in the annular space in countercurrent direction. The composition of the binary-component mixtures is varied. An empirical equation is derived to correlate condensation heat transfer performance. A semitheoretical model is developed to predict laminar- and turbulent-film condensation on a vertical surface. Theory compares well with experiments. The vapor-coolant temperature difference remains practically constant throughout the entire flow passage, thus reducing the exergy loss to a minimum. The device is particularly attractive in extracting the available energy from geothermal and ocean thermal energy sources.

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