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吸附式制冷是一种绿色环保节能的制冷技术,在低于100℃的低品位热能如废热能、太阳能等的利用方面具有广阔的发展前景。为了能够利用这部分的能源,提出了由吸附制冷过程与再吸附过程组成的二级吸附式制冷循环。采用SrCl2-NH4Cl-NH3作为工质对,测试不同蒸发温度与冷却温度下吸附剂的吸附与解吸性能。实验测试结果表明:当热源温度为70℃时,二级吸附式制冷也能够实现-25℃下的冷量输出。在测试工况下,氯化锶的最大吸附量达到了理论吸附量的94%。80℃热源、25℃冷源以及-25℃制冷条件下二级吸附式制冷循环的COP和SCP达到了0.250与160W.kg-1。这个数值与CaCl2-BaCl2-NH3两级冷冻在85℃驱动热源以及同等的冷源与制冷温度条件下的数据相对比,驱动热源需求降低了5℃,COP提高了4%,SCP提高了10%以上。
Adsorption refrigeration is a kind of green energy-saving refrigeration technology, which has broad prospects for the utilization of low-grade thermal energy such as waste heat and solar energy below 100 ° C. In order to make full use of this part of energy, a two-stage adsorption refrigeration cycle consisting of adsorption refrigeration process and re-adsorption process was proposed. Using SrCl2-NH4Cl-NH3 as a working pair, the adsorption and desorption properties of adsorbents at different evaporation temperature and cooling temperature were tested. Experimental results show that: when the heat source temperature is 70 ℃, two-stage adsorption refrigeration can also achieve the cold output at -25 ℃. Under the test conditions, the maximum adsorption of strontium chloride reached 94% of the theoretical adsorption capacity. The COP and SCP of the two-stage adsorption refrigeration cycle at 80 ° C heat source, 25 ° C cold source and -25 ° C refrigeration achieved 0.250 and 160W.kg -1. This figure compares favorably with the data from a CaCl2-BaCl2-NH3 two-stage freeze at 85 ° C driven heat source and equivalent cold and cold temperatures with a 5 ° C reduction in COP, a 4% increase in COP and a 10% increase in SCP the above.