A LIQUID-LIQUID EXTRACTION ABSORPTION REFRIGERATION CYCLE

摘要

An absorption refrigeration cycle using liquid-liquid extraction is presented. A solvent, partially misciblewith a refrigerant (e.g., water) and immiscible with an absorbent (e.g., LiBr), is employed to extractrefrigerant from a weak absorption solution (e.g., 59.5% LiBr/H_2O); as a result, a strong absorption solution(e.g., 64% LiBr/H_2O) and a refrigerant-rich extract solution are achieved. The refrigerant in the extractsolution is recovered by cooling due to the change of the solubility of refrigerant with temperature. There isno evaporation of refrigerant involved in the generation, so the heat input required would be reduced.Calculations indicate that the COP of the cycle could be increased by 20~50% compared with conventionalsingle effect absorption cycles at higher generation temperature. This improvement is strongly dependent ongeneration temperature, circulation ratio of extract solution to refrigerant, specific heat of the extractsolution and effectiveness of the heat exchanger.