The dual temperature air-source heat pump reduces energy consumption and has wide application potential. A novel dual temperature air-source heat pump (NDAHP) system based on ejector-vapor compression cycle is proposed in this study. The system produces two types of heat sources (high- and low-temperature hot water). A theoretical model describing the performance of the system is established and validated, and the performance indices of the system, including the heating coefficient of performance (COP_h), heating capacity per volume (q_v), and the second law efficiency (ƞ_II) are obtained. The above-mentioned indices of the conventional dual temperature air-source heat pump (CDAHP) system and the NDAHP system using various refrigerants (R717, R1234yf, R134a, and R290) are compared. Results show that the NDAHP outperforms the CDAHP under various operating conditions. Compared with the CDAHP, the NDAHP improves the COP_h, q_v, and ƞ_II by 20.0% to 48.9% under a typical operating condition. The R290 shows the best performance among the various refrigerants. The performance of the NDAHP system is more sensitive to the evaporating temperature than the condensing temperature. Additionally, the ƞ_II of the NADHP system is significantly affected by the high-temperature heating load ratio (LR) and increases with the increase of the LR. This study hopes to provide a foundation for further research on the NDAHP systems.

双温空气源热泵能耗低，应用潜力大。本研究提出了一种基于喷射器-蒸汽压缩循环的新型双温空气源热泵 (NDAHP) 系统。该系统产生两种类型的热源（高温和低温热水）。建立并验证了描述系统性能的理论模型，并确定了系统的性能指标，包括性能热系数（COP _h）、单位体积热容量（q _v）和第二定律效率（ƞ _II) 获得。比较了传统双温空气源热泵（CDAHP）系统和使用各种制冷剂（R717、R1234yf、R134a和R290）的NDAHP系统的上述指标。结果表明，NDAHP 在各种操作条件下都优于 CDAHP。与 CDAHP 相比，NDAHP在典型操作条件下将COP _h、q _v和ƞ _II提高了 20.0% 至 48.9%。R290 在各种制冷剂中表现出最佳性能。NDAHP 系统的性能对蒸发温度比对冷凝温度更敏感。此外，ƞ _II所述NADHP系统的通过高温加热负载比（被显著影响LR），并增加了与增加LR。本研究希望为进一步研究 NDAHP 系统提供基础。