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三元混合工质在变浓度空气源热泵中的应用 总被引:4,自引:0,他引:4
简要回顾了国内外变浓度(容量)热泵系统中混合工质的研究进展,结合理论和试验结果,提出了在变浓度空气源热泵系统中使用三元混合工质的概念,并与二元混合工质进行了比较。通过数值模拟优选出具有较大潜力的R32/R125/R227ea,R32/R143a/R22Tea,R32/R143a/R134a和R32/R125/R134a三元非共沸混合工质,分析了它们在变浓度热泵系统中的运行特性,结果表明,它们在满足热泵变浓度容量调节方面具有较大潜力,是替代R22的理想工质,其中首推R32/R125/R227ea。 相似文献
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利用螺杆式高温热泵实验台,以混合工质R134a/R245fa(质量比3∶7)和纯工质R245fa为研究对象,实验研究了两种工质在高温工况下的循环性能,并进行对比分析.结果表明,混合工质R134a/R245fa的制热量比同工况下R245fa机组高27.6%~44.3%,COP值比同工况下R245fa机组低14.3%~22.8%.当冷凝器出水温度为99.8℃时,混合工质R134a/R245fa的冷凝压力为2.12 MPa,排气温度为114.2℃,均处在机组安全范围之内.而R245fa因具有更低的冷凝压力和排气温度,可作为冷凝器更高出水温度时的热泵工质. 相似文献
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对替代CFC工质的HFC工质R134a、R32、R152a以及3种不同质量分数配比的R32/R134a进行了可燃性试验研究,有源可燃工质R134a、R32及R32/R134a可作为热泵制冷剂。 相似文献
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In this paper, a new refrigeration cycle (NRC) using the binary non-azeotropic refrigerant mixture R32/R134a is presented, which can be an alternative refrigeration cycle applied in residential air-conditioner. In the NRC, refrigerant circuit of the evaporator is separated into two branches. Because the non-azeotropic mixture has the characteristic of temperature glide, an important benefit of such configuration is that the Lorentz cycle can be realized. Compared with that of conventional cycle configuration, the new cycle efficiency can be improved. The calculating results show that, in the conventional refrigeration cycle (CRC), the mixture R32/R134a has a close performance to that is obtainable with pure refrigerant R22. However, the mixture R32/R134a in the NRC will result in a better performance. The maximal COP can be improved in a range of 8–9% over that of the CRC, and the volumetric refrigerating capacity can be approximately increased by 9.5%. 相似文献
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通过换热器优化软件设计了一款微通道平行流蒸发器模型,利用已验证的传热与压降关联式,在不同的模拟工况下研究分析了R22、R290(propane)、R134a、R410A、R1234yf在蒸发器模型中的传热与流动性能。结果表明:在质量流量一定的条件下,R290的换热量远高于其他制冷剂,是R22的1.63倍,R410A的换热量与R22相差无几,换热量最小的制冷剂为R1234yf;R290的充注量为147 g,仅为R22的72.4%,R134a的充注量最大,达到了221 g;制冷剂侧压降损失最大的R290,压降损失达到了75.4 k Pa。在理论换热量一定、质量流量不定的条件下,换热量最大的制冷剂是R134a,达到了8 500 W;充注量和制冷剂侧压降损失最小的制冷剂为R290,并且其换热量达到了8 230.4 W。 相似文献
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通过对14种由R32、R125、R134a、R152a、R290(丙烷)及R1270(丙烯)组成的制冷剂混合物的性能分析,以求寻一种替代HCFC—22用于家用空调器的理想制冷剂。 相似文献
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The objective of this paper was to study the application and working fluid type of a closed-loop oscillating heat pipe with check valves on energy consumption in split type air conditioning system. In the experiment, the CLOHP/CV was fabricated from the copper tube with the diameter of 2.03 mm. In the usual range of 20-27 °C indoor design temperature and 50% relative humidity. R134a, R22 and R502 refrigerant was used as working fluid in the CLOHP/CV set for this study. In comparison of the type with a conventional air conditioning system and that with the CLOHP/CV air conditioning system, the results have shown that; the new cooling load had increased 3.6%, the latter gave the highest value of 14.9%, 17.6% for COP and EER, respectively. The highest value of heat flux was 5.19 kW/m2 with R134a was used as the working fluid, at overall operating temperature. The results of this study are expected to guideline as they improve the performance of the air conditioning system in buildings, which reduce its energy consumption. 相似文献