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The Experimental Investigation and Theoretical Analysis on Transcritical Carbon dioxide Heat Pump Cycle

机译：跨临界二氧化碳热泵循环的实验研究与理论分析

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The (H)CFC-phase-out and the fear for future problems for other synthetic working fluids, because of their known and unknown impact on the environment, have introduced a rising interest in environmentally safe natural working fluids. CO_2 is one of the few non-toxic and non-flammable working fluids that do not contribute to ozone depletion or global warming, if leaked to the atmosphere. Because the critical temperature of CO_2 is only 31.1°C, the transcritical cycle can be used to improve the coefficient of performance of the system. The experimental investigation and theoretical analysis on transcritical carbon dioxide heat pump system are carried out in this paper. It points out that there is an optimum operational pressure on transcritical carbon dioxide heat pump cycle, when the outlet temperature of gas cooler is constant, the coefficient of performance increases with increasing evaporating temperature at the same conditions, and the operational efficiency increased with decrease of gas cooler exit temperature. So in order to obtain the optimum performance, the influence of evaporating temperature, gas cooler exit temperature, and the operational pressure should be considered during the designing and operating transcritical carbon dioxide heat pump system.
机译：（h）氟氯化碳淘汰和对其他合成工作流体的未来问题的恐惧，因为它们对环境的已知和未知的影响，引入了对环境安全的天然工作流体的兴趣。 CO_2是少数无毒和不易燃的工作液之一，如果泄漏到大气中，没有贡献臭氧耗尽或全球变暖。因为CO_2的临界温度仅为31.1°C，所以跨临界循环可用于改善系统性能系数。本文进行了跨临界二氧化碳热泵系统的实验研究和理论分析。它指出，在跨临界二氧化碳热泵循环上存在最佳操作压力，当气体冷却器的出口温度恒定时，性能系数随着在相同条件下的蒸发温度的增加而增加，并且随着时间的推移而增加气体冷却器出口温度。因此，为了获得最佳性能，在设计和操作跨临界二氧化碳热泵系统中应考虑蒸发温度，气体冷却温度和操作压力的影响。

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