将CO2、R170和R41应用于跨临界空气源热泵热水器系统的性能对比研究

基于一套空气源热泵热水器系统，首先建立了相关的热力学参数计算模型，之后将CO₂、R170和 R41这3种制冷剂分别应用于该系统，并对跨临界循环的热力学性能及效率进行计算，最后对各性能参数进行详细对比。研究结果表明：在同样的工况下对比COP_heat和效率，R41系统分别比CO₂系统提升了31.77%和23.34%，而R170系统则提升了4.9%和3.6%；R41和R170在提升系统制热量方面也具有明显的优势；R41和R170的系统最优运行高压也比CO₂系统分别降低了35%和43%。因此，除了CO₂外，R41和R170也是另外2种很有潜力的应用于跨临界循环的制冷剂。

Comparison of air-source heat pump water heater performance with transcritical cycle using CO2, R170 and R41 as refrigerant

On the basis of an air-source heat pump water heater (ASHPWH) system, a thermodynamic model used to calculate system performance is developed. Then, the performances and exergy efficiencies of a transcritical cycle with CO₂, R170 and R41 are investigated and compared. The results indicate that the COP_heat and exergy efficiencies of R41 (R170) system are about 31.77% (4.9%) and 23.34% (3.6%) higher than that of CO₂ system under the same condition. R41 and R170 also have obvious advantages in increasing the heating capacity. Moreover, the optimum high pressure of systemwith R41 (R170) is more than 35% (43%) lower compared to that with CO₂. So, besides CO₂, R41 and R170 are also promising refrigerants for an ASHPWH system.