This study proposes the low GWP zeotropic mixtures applied in the air source heat pump for the domestic hot water production using the city water of 15 °C. The large glide temperature in zeotropic mixture side was applied to match temperature lift in hot water side in the condenser. Fifteen zeotropic mixtures, composed of the low boiling compositions (R744, R41, and R170) and high boiling point compositions (RE170, R600a, R1234yf, R1234ze(E), and R290), were compared. A new indicator named temperature match degree (TMD) was applied to evaluate the heat exchanging process. Besides, the system performances, including energy efficiency ratio (EER), exergy efficiency (η_ex), volumetric heating capacity (q_v, kJ/m³), are evaluated under different conditions. The results showed that the heat pumps using the zeotropic mixtures show better performance than that of the corresponding pure composition, except for q_v. The maximum EER, η_ex and q_v reaches 4.17, 0.472 and 3702 kJ/m³ with the mole fraction of R744/RE170 of 0.3/0.7.TMD was also improved by the zeotropic mixtures, and the maximum TMD reaches 76 % with the mole fraction of RE170/R600a of 0.6/0.4, which is triple for R600a. The results prove the potential of the heat pumps using the large glide temperature zeotropic mixtures applied in domestic hot water production.

本研究提出将低 GWP 非共沸混合物应用于空气源热泵，使用 15 °C 的自来水生产生活热水。共沸混合物侧的大滑移温度用于匹配冷凝器中热水侧的温度升高。比较了由低沸点组合物（R744、R41 和 R170）和高沸点组合物（RE170、R600a、R1234yf、R1234ze(E) 和 R290）组成的十五种非共沸混合物。一种名为温度匹配度（TMD）的新指标被用于评估热交换过程。此外，系统性能，包括能效比（EER）、火用效率（η _ex）、体积热容量（q _v , kJ/m³），在不同的条件下进行评估。结果表明，使用非共沸混合物的热泵表现出比相应的纯组合物更好的性能，除了q _v。当R744/RE170的摩尔分数为0.3/0.7时，EER、η _ex和q _v的最大值分别达到4.17、0.472和3702 kJ/m ^{3 。}非共沸混合物也改善了 TMD，最大TMD达到 76%，RE170/R600a 的摩尔分数为 0.6/0.4，是 R600a 的三倍。结果证明了使用大滑移温度非共沸混合物的热泵在生活热水生产中的潜力。