Conventional hybrid absorption-compression heat pumps are difficult to efficiently upgrade waste heat to a heating temperature of above 90 °C. In this paper, to solve this problem, two novel approaches, namely a two-stage rectification and a subcooler, are specially proposed for the hybrid heat pump. By designing a two-stage rectification to reduce the suction temperature of compressor, thereby lowering its discharge temperature, commercially available normal-temperature compressors can be employed in the hybrid heat pump for high-temperature heating. By utilizing a subcooler proposed to reduce the irreversible loss during the throttling process, the energy efficiency of the hybrid heat pump is improved. Moreover, the hybrid heat pump with multi-stage subcoolers is also proposed and analyzed. Thermodynamic analysis exhibits that, at a heating temperature of 120 °C and a solution heat exchanger effectiveness of 0.8, the hybrid heat pump with a two-stage rectification and a subcooler brings about an energy efficiency improvement of 17.4% in comparison to the conventional one.

常规的混合吸收-压缩热泵难以有效地将废热提升到90°C以上的加热温度。为了解决这个问题，为混合热泵专门提出了两种新颖的方法，即两级精馏和过冷器。通过设计两级精馏以降低压缩机的吸入温度，从而降低其排放温度，可以在混合式热泵中使用市售的常温压缩机以进行高温加热。通过利用为减少节流过程中不可逆损失而提出的过冷器，可提高混合热泵的能效。此外，还提出并分析了带有多级过冷器的混合热泵。热力学分析表明，