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针对太阳能金属管式吸附床传热传质存在的不足,采用增加吸附管传热翅片及增大传质通道的方法,提出一种整体强化传热传质的新型翅片管设计方法,分别设计两种结构形式的太阳能吸附集热器,建立采用活性炭-甲醇为工质对的太阳能吸附式制冷系统。实验表明,采用吸附管横放、两端分别连接汇流导管形式的太阳能翅片管式吸附集热床可明显改善系统制冷性能,其吸附制冷效率是采用吸附管纵向放置、从翅片管上部通过导管连接到汇流导管的吸附床的太阳能吸附式制冷系统的3.56倍。采用性能较好的吸附床可构建太阳能吸附式制冷系统,并在晴朗无云、晴天有时有云、多云辐射强烈及多云辐射微弱4种典型天气情况下,进行吸附制冷系统运行特性和制冷性能实验研究,结果表明前三种天气条件下吸附床维持较高温度(≥80℃)超过4 h,制冷剂解吸较为充分,均产生制冰效果,制冷效率较高,COP最高达0.129;在多云太阳辐射微弱天气条件下,虽然吸附床维持在较高温度(≥80℃)时间不到2 h,但COP可达0.039,体现出该翅片管式吸附床良好的天气适应性。
Aiming at the deficiency of heat and mass transfer in the solar metal tubular adsorbent bed, a new type of finned tube design method of overall heat and mass transfer enhancement is proposed by increasing the heat transfer fins of the adsorbent tube and increasing the mass transfer channels. Two types of solar collector collectors are designed, and a solar adsorption refrigerating system using activated carbon-methanol as working material pair is established. Experiments show that the use of horizontal suction tube, the two ends are connected to the form of sink duct solar collector tube can significantly improve the cooling performance of the system, the adsorption cooling efficiency is the use of longitudinal adsorption tube, the tube from the top of the fin tube 3.56 times the solar absorption refrigeration system connected to the adsorption bed of the confluence conduit. Adopt the better performance adsorption bed to construct the solar energy absorption refrigerating system, and carry out the experiment of performance and refrigeration performance of the adsorption refrigeration system under four typical weather conditions: clear and cloudless, sunny and sometimes cloudy, cloudy and strong radiation and cloudy radiation The results show that the adsorbent bed maintains high temperature (≥80 ℃) for more than 4 h in the first three weather conditions, and the refrigerant desorption is more sufficient, both of which produce ice making effect with higher cooling efficiency and COP of up to 0.129; in the cloudy sun Under weak radiation conditions, although the adsorption bed was maintained at a higher temperature (≥80 ℃) for less than 2 h, the COP reached 0.039, which showed good weather adaptability of the finned tubular adsorption bed.