RESEARCH ON ENHANCING FALLING-FILM PERFORMANCE OF A NEW SOLAR LIBR ABSORPTION REFRIGERATION SYSTEM

摘要

A Lithium Bromide (LiBr) absorption refrigeration system with new falling-film surface is driven byrnsimulated solar heat. This paper aims to present the falling-film evaporation and absorption performance of arnsolar refrigeration system, and typical experimental data. The aqueous solution of LiBr is absorbed and therncondensate is evaporated in steady continuous absorption and evaporation without the absorber pump and thernevaporator pump. In a cross-flow horizontal falling-film heat exchanger, the staggered coil is wrapped withrnthe mesh screen to hold up more liquid film. The performance of the heat and mass transfer is improved duernto an increase in the wet ratio of the surface. The heat, mass and momentum transport relevant to liquidvaporrnflows are analyzed in detail. An experimental study is carried out to analyze the performance of thernrefrigeration system and to characterize the effects of the absorption pressure, the inlet temperature of thernsolution, and the inlet temperature of the cooling water on the heat and mass transfer in the absorptionrnprocess. The implications of the data are discussed in detail.