上海理工大学 能源与动力工程学院，上海 200093
针对容积式膨胀机出口压力与冷凝器内背压不同导致不可逆损失现象的存在，改进并设计了可变膨胀比的滚动活塞式膨胀机，并分析其工作原理。以R245fa为工质，研究了蒸发器内有机工质无过热、膨胀机无泄漏条件下，系统参数变化对膨胀机最佳膨胀比的影响。结果表明：膨胀机的最佳膨胀比受膨胀机效率的影响很小，而受发生温度和冷凝温度的影响较大，蒸发温度越高，最佳膨胀比越大，冷凝温度越高，最佳膨胀比越小，当系统某参数变化时，可以通过调节系统的其他参数使膨胀机处于最佳膨胀比下运行。为膨胀机膨胀比的设计和运行工况的选择提供参考依据。College of Power Engineering, University of Shanghai for Science Technology, Shanghai China, Post Code: 200093
Due to the fact that thevolumetric expander outlet pressure does not agree with back pressure in the condenser and leads irreversible loss, a new type of rolling piston expander which can adjust expansion ratio was designed and its working principle was analyzed in this paper. With R245fa as working fluid, the effect of system parameters on the optimum expansion ratio was studied by assuming no superheat in generator, no undercooling in condenser and no leakage in expander. The results showed that the optimum expansion ratio is marginally affected by expander efficiency, while greatly influenced by generator temperature and condenser temperature. Higher the generator temperature leads to larger optimum expansion ratio, while higher condenser temperature results in smaller optimum expansion ratio. While some system parameters are varying, adjusting other system parameters can lead to the expander operating at the optimum expansion ratio. This paper is believed to provide a reference for designing expansion ratio and determining working condition for expander.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai, China, Post Code: 200093
NO.704 Research Institute, CSIC, Shanghai, Post Code: 200031)//Journal of Engineering for Thermal Energy
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