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Frosting of heat pump with heat recovery facility

机译：带有热回收装置的热泵结霜

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This paper aims to prolong the heat pump frost time and reduce its growth with heat recovery facility, which should mix the exhausted indoor and outdoor air before entering the evaporator. An ideal mathematic model is developed for heat transfer, frost generation and airside pressure drop. The properties of the mixture would be obtained by solving the mass and energy conservation equations. A parametric analysis is performed to investigate the effects of air inlet temperature, relative humidity and air mass flow rate on total heat transfer coefficient, frost thickness and airside pressure drop, respectively. The results show that rationalizing the ratio of indoor and outdoor air could prolong frosting time and reduce the frost thickness greatly. The total heat transfer coefficient, frost thickness and airside pressure drop increase monotonically with time going, but are not proportional.. Decreasing the mixture inlet air temperature and relative humidity could essentially reduce frost growth on the tube surfaces. This can also be observed when increasing the air mass flow rate.
机译：本文旨在通过热回收设备延长热泵的结霜时间并减少其结霜，该设备应在进入蒸发器之前混合排出的室内和室外空气。为传热，结霜和空气侧压降开发了理想的数学模型。混合物的性质将通过求解质量守恒方程和能量守恒方程来获得。进行参数分析以研究进气温度，相对湿度和空气质量流量分别对总传热系数，霜厚度和空气侧压降的影响。结果表明，合理化室内外空气比例可以延长结霜时间，大大减小结霜厚度。总传热系数，霜厚度和空气侧压降随时间单调增加，但不成比例。降低混合物入口空气温度和相对湿度可实质上减少管表面霜的生长。当增加空气质量流量时，也可以观察到这一点。

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