针对100℃以下温度低品位热能的利用,提出二级吸附式制冷循环,建立吸附性能测试实验台。分别以氯化钙与氯化钡作中温盐与低温盐,测试当冷却温度为30℃时,不同热源温度与不同蒸发温度条件下吸附剂的循环吸附量,并在此基础上,分析二级吸附式制冷系统的性能。研究表明,二级吸附式制冷循环能够满足全年冷冻工况的应用,并且当热源温度、冷却温度及蒸发温度分别为80℃、30℃及-20℃时,氯化钙的循环吸附量、二级吸附式制冷系统的COP与SCP分别为0.490 kg/kg,0.24与85.6 W/kg。
To utilize low-grade heat energy below 100℃,a two-stage adsorption refrigeration cycle was proposed and adsorption performance testing unit was also established.CaCl_2 and BaCl_2 were chosen as middle-temperature salt and low-temperature salt,respectively.Cycle adsorption quantities of the adsorbents under different heating and evaporating temperatures were tested,based on which COP and SCP of the two-stage adsorption system were obtained.Results showed that the two-stage adsorption refrigeration cycle is apt for utilization of low-grade heat energy on freezing application. Cycle adsorption quantity of CaCl_2,COP and SCP of the two-stage adsorption refrigeration system are 0.490 kg/kg,0.24 and 85.6 W/kg,respectively,when heating temperature,cooling temperature and evaporating temperature are 80,30 and-20℃,respectively.
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