Previously, the conventional fin-and-tube heat exchanger is usually chosen as the evaporator in the air source heat pump. Recently, with the higher heat transfer efficiency, the microchannel heat exchanger is increasingly recognized. Nevertheless, information available in the contrastive analysis of the two heat exchanger types is scarce. Therefore, the effect of the mentioned evaporator type on the air source transcritical CO₂ heat pump was experimentally studied in this paper. Then, with the detailed techno-economic analysis methods, the heat pump with different heat exchangers is evaluated from multiple perspectives. Results showed the heating capacity and coefficient of performance of the microchannel system were increased by 16.5%-37.3% and 16.3%–22.6%, compared with the baseline fin-and-tube system. However, the attenuation degree of heating capacity was more obvious in the fin-and-tube system under the frosting condition. The primary energy consumption, CO₂ emission and corresponding cost of microchannel system are declined by 6.28 tce, 14.4 tons and 77.6 dollars for the comparison with the fin-and-tube system. The maximum values are all presented by direct electric heater whereas the minimum life cycle cost is achieved by coal-fired boiler. The life cycle cost and sensitivity analysis with unit electricity price are also conducted in the economic analysis.

此前，空气源热泵中的蒸发器通常选用传统的翅片管式换热器。近年来，随着传热效率的提高，微通道换热器得到越来越多的认可。然而，在两种换热器类型的对比分析中可用的信息很少。因此，上述蒸发器类型对空气源跨临界 CO _{2 的影响}本文对热泵进行了实验研究。然后，通过详细的技术经济分析方法，从多个角度对不同换热器的热泵进行评估。结果表明，与基线翅片管系统相比，微通道系统的加热能力和性能系数分别提高了16.5%-37.3%和16.3%-22.6%。而在结霜条件下，翅片管系统制热能力衰减程度更为明显。一次能源消耗，CO ₂与翅片管系统相比，微通道系统的排放量和相应成本降低了6.28 tce、14.4吨和77.6美元。最大值均由直接电加热器呈现，而最小生命周期成本由燃煤锅炉实现。经济分析中还进行了生命周期成本和单位电价的敏感性分析。