由曹祥、张春路撰写的论文Analysis and experiment of stepped pressure cycle performance conditional on evaporator superheat在Applied Thermal Engineering 2020年第180卷在线发表。作者受国家自然科学基金资助，已经基于梯级吸排气循环理论完成了多种高能效制冷热泵系统的研发。但是，本论文发现采用梯级吸排气循环不一定能提升系统能效，而是与蒸发器过热度有关。当蒸发器过热度为0时，从理论上证明了双吸气压力(DSP)循环一定能提升系统能效；但是，当逆流蒸发器采用大过热度控制时，仿真计算和样机实验都发现DSP循环反而会造成系统能效下降。本文工作有助于深入理解梯级吸排气循环，并量化其适用条件。

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论文摘要：

The stepped pressure cycle has been proven high energy-saving potentials in refrigeration and heat pump applications. However, recently we found that the conclusion of energy-saving is conditional on the evaporator superheat. To in-depth understand the effect of evaporator superheat on stepped pressure cycle performance, we did investigation by using the analytic method, numerical analysis and lab experiment in this paper. Theoretical proof confirmed that the dual suction pressure (DSP) cycle can always achieve higher COP (coefficient of performance) than the simple cycle at zero superheat. When parallel-flow evaporators are used and the superheat exists, the DSP cycle still reaches higher COP than the simple cycle at the same superheat. Maximum 9.0% COP improvement with 4K superheat was found in the lab test. However, with counter-flow evaporators, the DSP cycle can be less efficient than the simple cycle at large superheat. Moreover, the inherent relation between the COP improvement and the uniformity of temperature difference field in evaporators was discussed.