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采用由吸附制冷过程与再吸附过程组成的二级化学吸附冷冻循环系统。再吸附过程能够解决热源温度和环境温度限制的问题。将CaCl_2/NaBr/NH_3作为工质对,测试不同蒸发温度与环境温度下吸附剂的吸附性能。实验结果和性能预测表明:复合吸附剂的密度为400 kg·m~(-3)时,理论COP的范围为0 256～0 277。在热源温度90℃,冷凝温度25℃,蒸发温度5℃时,SCP最大为267.9 W·kg~(-1)。在测试工况下,氯化钙的最大吸附量0.808 kg~(-1),超过了理论吸附量的87%。
A two-stage chemisorption refrigeration cycle consisting of an adsorption refrigeration process and a re-adsorption process is used. Re-adsorption process can solve the problem of heat source temperature and ambient temperature limit. Using CaCl 2 / NaBr / NH 3 as working pair, the adsorption performance of adsorbents under different evaporation temperature and ambient temperature was tested. The experimental results and performance prediction show that the theoretical COP range is 0 256 ~ 0 277 when the density of composite adsorbent is 400 kg · m -3. The maximum SCP value was 267.9 W · kg -1 when the heat source temperature was 90 ℃, the condensation temperature was 25 ℃ and the evaporation temperature was 5 ℃. Under the test conditions, the maximum adsorption capacity of calcium chloride was 0.808 kg ~ (-1), which exceeded 87% of the theoretical adsorption capacity.