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对于吸附式制冷系统而言,吸附材料的选择是系统的核心问题。对两种不同厂家的SAPO-34沸石分子筛进行了吸附特性测试。其共同特性是,温度一定时,SAPO-34分子筛的吸附量随相对湿度的增加而增大。相对湿度在40%~60%时,吸附量变化不大;而相对湿度在70%~80%时,吸附量增加较快。另一方面,由于两种SAPO-34样品的微观结构有一定差异,导致其吸附量和吸附速率也不一样。粒径较小、孔隙率较大的样品A,其吸附量比样品B大1~2倍,达到吸附饱和的时间也缩短近100分钟。此特性有利于改善吸附制冷系统的整体性能。
For adsorption refrigeration systems, the choice of adsorbent material is a central issue for the system. Two different manufacturers of SAPO-34 zeolite adsorption properties of the test. The common feature is that the adsorption capacity of SAPO-34 molecular sieve increases with the increase of relative humidity at a certain temperature. When the relative humidity is between 40% and 60%, the amount of adsorption does not change much. When the relative humidity is between 70% and 80%, the amount of adsorption increases rapidly. On the other hand, due to the differences in the microstructure of the two SAPO-34 samples, the amount of adsorption and the rate of adsorption are also different. The smaller particle size and larger porosity of sample A, the adsorption capacity of sample A is 1 ~ 2 times larger than that of sample B, and the time to reach the saturation of adsorption also shortens nearly 100 minutes. This feature helps to improve the overall performance of the adsorption refrigeration system.