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Performance Assessment of Zeotropic Mixtures for Heat Pump Water Heaters
Journal of Thermophysics and Heat Transfer ( IF 2.1 ) Pub Date : 2021-09-13 , DOI: 10.2514/1.t6370
Nuochen Zhang 1 , Yuande Dai 1
Affiliation  

The subcritical cycle performances of eco-friendly pure refrigerants and zeotropic mixtures for heat pump water heater systems were performed by MATLAB programs. The results indicated that pure refrigerants are often restricted in meeting criteria such as environmental protection, efficiency, and flammability. The optimal compositions of R13I1/R161/R32, R13I1/R290/R32, and R13I1/R152a/R32 zeotropic mixtures are observed at 0.5/0.3/0.2, 0.15/0.65/0.2, and 0.3/0.5/0.2 (by mass), whose temperature glides are 6.2°C, 14.3°C, and 6.7°C under the given operating conditions, respectively. Meanwhile, the optimum heating coefficients of performance (COPs) are up to 5.04, 4.83, and 5.11, resulting in 10.5%, 5.9%, and 12.1% increments, respectively, compared to R22. However, the COP of R13I1/R1270/R32 exhibits a decreasing and then increasing trend with the rise of the R13I1 mass concentration. The volumetric heat capacities of R13I1/R161/R32 (0.5/0.3/0.2), R13I1/R290/R32 (0.15/0.65/0.2), and R13I1/R152a/R32 (0.3/0.5/0.2) blends yield 121.9%, 116.9%, and 94.1% of the R22 system, respectively. On the other hand, the mixtures are significantly superior in terms of lower pressure ratios, discharge temperatures, and irreversibilities of systems in comparison with R22. Furthermore, the operating pressures of blends are similar to that of R22. Consequently, it is concluded that these three zeotropic mixtures can be superior alternatives to R22 and R134a for heat pump water heater applications.



中文翻译:

热泵热水器非共沸混合物的性能评估

热泵热水器系统的环保纯制冷剂和共沸混合物的亚临界循环性能由MATLAB程序执行。结果表明,纯制冷剂在满足环保、效率和可燃性等标准方面往往受到限制。观察到 R13I1/R161/R32、R13I1/R290/R32 和 R13I1/R152a/R32 共沸混合物的最佳组成分别为 0.5/0.3/0.2、0.15/0.65/0.2 和 0.3/0.2 和 0.3/0.5 质量)。在给定的操作条件下,其温度分别下滑 6.2°C、14.3°C 和 6.7°C。同时,最佳加热性能系数 (COP) 高达 5.04、4.83 和 5.11,与 R22 相比,分别增加了 10.5%、5.9% 和 12.1%。然而,R13I1/R1270/R32 的 COP 随着 R13I1 质量浓度的增加呈现先减小后增大的趋势。R13I1/R161/R32 (0.5/0.3/0.2)、R13I1/R290/R32 (0.15/0.65/0.2) 和 R13I1/R152a/R32 (0.3/0.5/0.2) 混合物的体积热容量为 121.9%,产率为 121.9% R22 系统的 % 和 94.1%。另一方面,与 R22 相比,混合物在较低的压力比、排放温度和系统的不可逆性方面明显优越。此外,混合物的操作压力与 R22 相似。因此,得出的结论是,对于热泵热水器应用,这三种共沸混合物可以是 R22 和 R134a 的优良替代品。R13I1/R152a/R32 (0.3/0.5/0.2) 共混物分别为 R22 系统的 121.9%、116.9% 和 94.1%。另一方面,与 R22 相比,混合物在较低的压力比、排放温度和系统的不可逆性方面明显优越。此外,混合物的操作压力与 R22 相似。因此,得出的结论是,对于热泵热水器应用,这三种共沸混合物可以是 R22 和 R134a 的优良替代品。R13I1/R152a/R32 (0.3/0.5/0.2) 共混物分别为 R22 系统的 121.9%、116.9% 和 94.1%。另一方面,与 R22 相比,混合物在较低的压力比、排放温度和系统的不可逆性方面明显优越。此外,混合物的操作压力与 R22 相似。因此,得出的结论是,对于热泵热水器应用,这三种共沸混合物可以是 R22 和 R134a 的优良替代品。混合物的操作压力与R22相似。因此,得出的结论是,对于热泵热水器应用,这三种共沸混合物可以是 R22 和 R134a 的优良替代品。混合物的操作压力与R22相似。因此,得出的结论是,对于热泵热水器应用,这三种共沸混合物可以是 R22 和 R134a 的优良替代品。

更新日期:2021-09-14
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