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Thermodynamic performance of HCFC22 alternative refrigerants for residential air-conditioning applications

机译：家用空调应用中HCFC22替代制冷剂的热力学性能

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摘要

In this study, thermodynamic performance of two pure hydrocarbons and seven mixtures composed of propylene (R1270), propane (R290), HFC152a, and dimethylether (RE170, DME) was measured in an attempt to substitute HCFC22 in residential air-conditioners. The pure and mixed refrigerants tested have greenhouse warming potentials (GWPs) of 3-58 as compared to that of CO_2 and the mixtures are all near-azeotropic having the gliding temperature difference (GTD) of less than 0.6℃. Thermodynamic cycle analysis was carried out to determine the optimum compositions before testing and actual tests were performed in a breadboard type laboratory heat pump/air-conditioner at the evaporation and condensation temperatures of 7 and 45℃, respectively. Test results show that the coefficient of performance (COP) of these mixtures is up to 5.7% higher than that of HCFC22. While propane showed 11.5% reduction in capacity, most of the fluids had the similar capacity to that of HCFC22. Compressor discharge temperatures were reduced by 11-17℃ with these fluids. There was no problem found with mineral oil since the mixtures were mainly composed of hydrocarbons. The amount of charge was reduced up to 55% as compared to HCFC22. Overall, these fluids provide good thermodynamic performance with reasonable energy savings without any environmental problem and thus can be used as long term alternatives for residential air-conditioning and heat pumping applications.
机译：在这项研究中，测量了两种纯烃和由丙烯（R1270），丙烷（R290），HFC152a和二甲醚（RE170，DME）组成的七种混合物的热力学性能，以尝试在家用空调中替代HCFC22。测试的纯制冷剂和混合制冷剂与CO_2相比具有3-58的温室变暖潜势（GWPs），并且混合物都是近共沸的，滑移温度差（GTD）小于0.6℃。进行热力学循环分析以确定最佳组成，然后在面包板型实验室热泵/空调器中分别在7和45℃的蒸发和冷凝温度下进行测试和实际测试。测试结果表明，这些混合物的性能系数（COP）比HCFC22高5.7％。尽管丙烷的容量降低了11.5％，但大多数液体的容量与HCFC22相似。使用这些流体可使压缩机的排气温度降低11-17℃。矿物油没有问题，因为混合物主要由碳氢化合物组成。与HCFC22相比，电荷量最多减少了55％。总体而言，这些流体提供了良好的热力学性能，并且在不存在任何环境问题的情况下节省了合理的能源，因此可以用作住宅空调和热泵应用的长期替代产品。

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