Performance of diffusion absorption refrigeration cycle with organic working fluids
Performance of diffusion absorption refrigeration cycle with organic working fluids
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DOI：
10.1016/j.ijrefrig.2009.01.010
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
A. Zohar;M. Jelínek;A. Levy;I. Borde
中科院分区：
文献类型：
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作者：
A. Zohar;M. Jelínek;A. Levy;I. Borde
扩散吸收制冷（DAR）循环由热驱动，并利用制冷剂和吸收剂的二元溶液作为工作流体，以及辅助惰性气体。商业DAR系统使用氨-水溶液和作为惰性气体的氢气或氦气操作。在这项工作中，一个简化的DAR系统与有机吸收剂的性能（DMAC -二甲基乙酰胺）和五种不同的制冷剂以及作为惰性气体的氦气进行数值检验，目的是与无毒制冷剂一起沿着降低发生器温度和系统压力。氯二氟甲烷（R22）、二氟甲烷（R32）、2-氯-1，1，1，2-正乙烷（R124）、五氟乙烷（R125）和1，1，1，2-正乙烷（R134 a）。并与以氨水和氦气为工质的相同系统的性能进行了比较。对于所有系统，发现了类似的行为，关于性能系数（COP）和富溶液和贫溶液浓度作为发生器温度的函数。结果发现，使用新物质的典型发生器温度为150°C，但较低的COP、较高的蒸发器温度和约40°C的较低冷凝温度控制这些系统。
A diffusion absorption refrigeration (DAR) cycle is driven by heat and utilizes a binary solution of refrigerant and absorbent as working fluid, together with an auxiliary inert gas. Commercial DAR systems operate with ammonia–water solution and hydrogen or helium as the inert gas. In this work, the performance of a simplified DAR system working with an organic absorbent (DMAC – dimethylacetamide) and five different refrigerants and helium as inert gas was examined numerically, with the aim of lowering the generator temperature and system pressure along with a non-toxic refrigerant The refrigerants were: chlorodifluoromethane (R22), difluoromethane (R32), 2-chloro-1,1,1,2-tetrafluoroethane (R124), pentafluoroethane (R125) and 1,1,1,2-tetrafluoroethane (R134a). The results were compared with the performance of the same system working with ammonia–water and helium. Similar behavior was found for all systems, regarding the coefficient of performance (COP) and rich and poor solution concentrations as functions of generator temperature. It was found that typical generator temperature with the new substances was 150°C, yet lower COPs, higher evaporator temperatures and lower condensation temperature of about 40°C governed these systems.