对热泵系统分别建立了中间补气和吸气补气两种热力学模型，模拟研究了系统的性能，并与常规热泵系统进行了对比。结果表明：混合后的吸气温度与吸气管路温度之间的差值Δt 是影响吸气补气热泵系统的关键；中间补气热泵系统在各个性能上优于吸气补气热泵系统，但吸气补气热泵系统可以通过调节合适的Δt 和补气量来提高系统性能；在不同的蒸发温度下，各热泵系统同一性能参数的变化趋势基本相同；蒸发温度在-10~-20 ℃范围变化时，与常规热泵系统相比，中间补气系统的最优COP提高了7.53%~8.90%；在Δt 为0.2 ℃的工况下，当蒸发温度从-20 ℃提升到-10 ℃时，吸气补气对系统性能的影响更显著。

Two thermodynamic models for the intermediate vapor injection and suction vapor injection heat pump systems are built.The system characteristics are numerically simulated and compared with the normal heat pump system.The results indicate that the temperature difference Δt between inspiratory and the suction pipe is the key to the heat pump system with suction vapor injection.The various performance characteristics of the heat pump system with intermediate vapor injection are better than the system with suction vapor injection.However,the systematic performance of the heat pump system with suction vapor injection can be improved by the proper adjustment ofΔt and vapor injection amount.Under different evaporation temperatures,the same performance parameter has the similar variation trend for the two heat pump systems.In the case of the evaporation temperature varying in range of -10 to -20 ℃,the optimal COP of the heat pump system with intermediate vapor injection increases by 7.53% to 8.90% compared to the normal heat pump system.And the effect of the suction vapor injection on the heat pump system is more significant when the evaporation temperature is increased from -20 ℃ to -10 ℃ with Δt of 0.2.

TB65；TB69