由曹祥、杨晨、孙钊、卢玥明、常萌萌、邵亮亮和张春路（通讯作者）撰写的论文A novel packaged outdoor air dehumidifier with exhaust air heat pump – Experiment and simulation在Applied Thermal Engineering 2020年第181卷在线发表。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。该创新成果已授权两项中国发明专利。

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论文摘要：

Outdoor air dehumidification is one of the key functions of the ventilation system. A small packaged ventilation system with a built-in exhaust air heat pump (EAHP) is becoming popular for residential use. However, the conventional EAHP has low dehumidification capability and energy efficiency because the restricted volume flow of exhaust air would lead to high condensing temperature. In this work, a novel EAHP with separation of subcooler and condenser is proposed for the packaged outdoor air dehumidifier. In the exhaust air duct, the return air first lowers the refrigerant liquid temperature in subcooler and then joins the bypass outdoor air to cool the condenser before exhaust. In this way, lower condensing temperature and lower liquid temperature before expansion valve can be achieved to improve both the dehumidification capability and energy efficiency. A functional prototype was designed and tested. It achieved the dehumidification capability of 78.2 kg/day and the cooling COP (coefficient of performance) of 3.65 under the rated conditions. Moreover, based on a validated model, simulations show that energy efficiency of the novel system is superior to that of the conventional ones under variable operating conditions except for low dehumidification load.