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本文引入新开发的可调喷射器对跨临界CO_2热泵系统性能进行了理论和实验研究。建立系统部件的模型,以制冷剂侧为主线,建立整个系统模型,分析高压侧压力对制热系数、制热量、喷射系数和升压比等参数影响。为验证系统理论模型的合理性,在自行搭建的实验台上通过喷针调节喷射器的喉部面积改变高压侧压力对系统性能开展实验研究。实验与模拟结果表明,稳定运行在最优高压侧压力对热泵系统具有十分重要的意义,不仅系统性能大幅提高,而且保证了热水的出水温度。
In this paper, a newly developed adjustable injector is introduced to study the performance of transcritical CO_2 heat pump system theoretically and experimentally. The model of system components was established. The refrigerant system was the main line. The whole system model was established. The influence of high pressure on heating coefficient, heating capacity, injection coefficient and step-up ratio was analyzed. In order to verify the rationality of the theoretical model of the system, experiments were carried out on the self-built test bench by adjusting the throat area of the ejector by changing the high-pressure side pressure of the ejector pin. The experimental and simulation results show that the steady operation of the optimal high pressure side of the pressure on the heat pump system is of great significance, not only a substantial increase in system performance, but also to ensure the hot water outlet temperature.