跨临界CO2空气源热泵系统性能研究
Research on System Performance of Air-source Transcritical CO2 Heat Pump

本文针对空气源跨临界CO2热泵系统，采用效率分析法建立了压缩机的数学模型，结构分析法建立了膨胀阀的数学模型，分布参数法建立了气体冷却器、蒸发器和中间换热器的数学模型，并将其耦合为整个系统的数学模型。实验验证了数学模型的计算结果，结果表明：机组输入功率的计算值与实测值的偏差＜4.4%；制热量的平均偏差为5.76%；最优排气压力的偏差＜0.1 MPa。综上所述，在确定的运行工况下，通过数学模拟计算某确定配置系统的性能参数是可行的。
Based on a theoretical analysis of an air-source transcritical CO2 heat pump system, a mathematical model for the compressor was developed using an efficiency analysis in this study. In addition, a mathematical model for the expansion valve was built using a structural analysis; and mathematical models for the gas-cooler, evaporator, and regenerator were developed using the distributed parameter method. Moreover, a mathematical model for the entire system was built by combining these models. The accuracy of the system model was verified by an experimental test, which showed that the deviation in the unit’s input power between the calculated value and measured value was less than 4.4%, the mean deviation in the heating capacity was 5.76%, and the deviation in the optimal discharge pressure was less than 0.1 MPa. Thus, it was possible to calculate the system performance by employing the mathematical simulation method