Pairs SrCl2-NH4Cl-NH3 and CaCl2-BaCl2-NH3 for a Two-stage Adsorption Freezing Cycle Driven by Low-temperature Heat Source

摘要

As an environmental benign and energy saving refrigeration technology, adsorption refrigeration has a great potential for the utilization of a low-grade energy, such as solar energy and industrial waste heat below 100oC. A two-stage adsorption refrigeration cycle was proposed based on adsorption refrigeration process and resorption process. Refrigeration performances of the working pairs were tested at different evaporation and condensation temperature. The results show that the present two-stage adsorption refrigeration cycle could obtain cooling output with -25°C when the temperature of heat resource was 70°C.The adsorption quantity of SrCl2 and CaCl2 are both more than 94% of theoretical adsorption quantity. Compared with SrCl2-NH4Cl-NH3 and CaCl2-BaCl2-NH3, generally the working pair of CaCl2-BaCl2-NH3 has optimal data of COP while the working pair of SrCl2-NH4Cl-NH3 has the optimal data of SCP. The maximum COP and SCP of the cycle were 0.25 and 0.25, 230.6W/kg and 278.7W/kg, respectively, for the working pairs of SrCl2-NH4Cl-NH3 and CaCl2-BaCl2-NH3, when the temperature of the cooling water was 25°C.