【摘要】 本文提出了一种分液冷凝喷射-压缩式热泵系统,通过分液冷凝的方法来提高冷凝器的传热系数。对此系统展开热力学分析,研究了工质组分以及运行工况对系统性能的影响,并与常规的喷射-压缩式热泵系统进行了性能对比分析。结果表明:工质组分对系统性能有很大的影响,当R290的质量分数为10%时,性能系数(COP)取得最大值7.30,相比常规系统,提高了53%;COP随着分液冷凝干度以及蒸发温度的升高而提高,随着冷凝温度的升高而降低;?分析结果表明,高温蒸发器、压缩机以及喷射器这3个部件中的?损失最大,当R290的质量分数为50%时,分别为28.4%、23.5%和16.7%。更多还原

【Abstract】 A liquid-separation condensation ejector-compression heat pump is proposed in this paper. The liquidseparation condensation method is adopted to improve the heat transfer coefficient of the condenser. The effects of working fluid components and operating conditions on the performance of the proposed system are analyzed, and the performance of proposed system is compared with that of conventional ejector-compression heat pump system.The results show that the working fluid composition has a great effect on the performance of the system. The 10%mass fraction of R290 results in the maximum coefficient of performance(COP) of 7.30, which increases by 53%compared to the conventional system. COP increases with the increase of the liquid separation condensation quality and evaporation temperature, and decreases with the increase of condensation temperature. Exergy analysis results show that the three parts of high temperature evaporator, compressor and ejector have the largest loss, when the mass fraction of R290 is 50%, they are 28.4%, 23.5% and 16.7% respectively.更多还原