Currently, the air source heat pump is widely used for space heating. Although the CO₂ has great potential in the refrigeration system, the basic transcritical CO₂ heat pump performance is restricted by the huge throttling irreversibility caused by the higher gas cooler outlet temperature. The internal heat exchanger has been investigated extensively from the energetic perspective. However, little information is available about the exergy analysis, let alone the exergoeconomic analysis. In this paper, the transcritical CO₂ heat pump with/without the internal heat exchanger is studied with the energy, exergy, and exergoeconomic analysis. Results show that the optimal coefficient of performance can be increased to 2.96 and 2.17 in the different heating terminals. The enlarged internal heat exchanger effectiveness is also beneficial to reduce the optimal discharge pressure and increased the system coefficient of performance. The throttling valve irreversibility is decreased from 0.067 to 0.145 kW·kW⁻¹ to 0.040–0.071 kW·kW⁻¹. With total irreversibility decrement, the exergy efficiency can be effectively improved, resulting in the 55.65%-73.42% reduction of the throttle valve cost rate. Considering the CO₂ compressor investment, its total exergy cost rate increment is reached up to 34.06%-50.21%, leading to the higher exergoeconomic factor. However, the sensitivity analysis results show that the cost per unit of exergy production is more sensitive to the electricity price. Moreover, the optimal cost per unit of exergy production reduction is declined by 58.71% with the return water temperature of 30 °C.

目前，空气源热泵广泛用于空间采暖。尽管CO ₂在制冷系统中具有巨大的潜力，但由于气体冷却器出口温度较高导致的巨大节流不可逆性限制了基本的跨临界CO ₂热泵性能。内部换热器已经从能量的角度进行了广泛的研究。然而，关于火用分析的信息很少，更不用说火用经济学分析了。在本文中，跨临界 CO ₂通过能量、火用和火用经济分析研究了带/不带内部换热器的热泵。结果表明，不同加热端的最佳性能系数可分别提高到2.96和2.17。增大的内部换热器效率也有利于降低最佳排放压力和提高系统性能系数。节流阀不可逆性从0.067 降低到0.145 kW·kW ^-1到0.040-0.071 kW·kW ^-1。总不可逆递减可有效提高火用效率，使节流阀成本率降低55.65%-73.42%。考虑到 CO ₂压缩机投资，其总火用成本率增量达到34.06%-50.21%，导致更高的火用经济系数。然而，敏感性分析结果表明，单位火用生产成本对电价更为敏感。此外，当回水温度为30℃时，单位火用减产的最优成本下降了58.71%。