Novel intermittent absorption cooling system based on membrane separation process
Novel intermittent absorption cooling system based on membrane separation process
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DOI：
10.1016/j.applthermaleng.2018.03.039
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发表时间：
2018-05-25
影响因子：
6.4
通讯作者：
Dehesa-Carrasco, U.
中科院分区：
文献类型：
--
作者：
Ibarra-Bahena, J.;Rivera, W.;Dehesa-Carrasco, U.
The present work analyses an intermittent absorption cooling system using a hydrophobic porous membrane unit as desorber/condenser and powered by thermal solar energy. Experimental test runs were carried out in a membrane unit to experimentally determine the amount of refrigerant produced at different operating temperatures. With the obtained information, an intermittent absorption cooling system was modelled at a larger scale using information from real solar collectors and considering a 1 m(2) membrane area. According to the experimental performance of the desorber/condenser unit, after 4 h of operation, the total amount of refrigerant produced was 14.50, 11.59 and 7.20 kg for desorber temperatures of 95.1, 85.2 and 75.1 degrees C, respectively. The designed solar system was composed of a 0.3 m(3) storage thermal tank, and 30.2, 25.6 and 20.9 m 2 of solar collector area for each desorber thermal level. According to the simulation of the absorption cooling system, evaporator temperatures of 18 and 14 degrees C were achieved for desorber temperatures of 75.1 and 85.2 degrees C, while evaporator temperatures of 17 and 12 degrees C were obtained at 95.1 degrees C. The COPs were 0.15, 0.21 and 0.26, which increased according to the increase in the desorber temperatures. Based on the clear desorber/condenser tendencies obtained from the refrigerant production, additional absorption conditions were calculated and may be useful for future designs. The lowest evaporator temperature was 6 degrees C when the initial LiBr concentration was 54.83% w/w, instead of 50.30% w/w at a temperature of 95.1 degrees C; however, the COP decreased 33%.
