关键词: 吸附式制冷, 二级吸附, 低温热源, 制冷性能

Abstract: Adsorption refrigeration is an environmental benign and energy saving refrigeration technology and has a great potential for the utilization of low-grade energy, such as solar energy and industrial waste heat below 100℃.For efficient utilization of these low-temperature heat sources, a two-stage adsorption refrigeration cycle was proposed based on the adsorption refrigeration process and resorption process. Refrigeration performance of the working pair of SrCl₂-NH₄Cl-NH₃ was tested at different evaporating and condensing temperatures.The results show that the two-stage adsorption refrigeration cycle can give the cooling output with the temperature of -25℃ when the temperature of the heat source is 70℃.The adsorption quantity of strontium chloride is 94% of the theoretical value.Under the condition of 80℃ heat source, 25℃ cooling source, and -25℃ refrigerating temperature, the COP and SCP are 0.250 and 160 W·kg^-1, respectively.At the same cooling and refrigerating temperatures, compared with the working pair of CaCl₂-BaCl₂-NH₃ with the heat source temperature of 85℃, the heat source temperature in this study decreases 5℃, and COP and SCP increase by 4% and 10%, respectively..

Key words: adsorption refrigeration, two-stage adsorption, low-temperature heat source, refrigeration performance