热泵和除湿板结合的固体除湿新风机组特性

Characteristics of outdoor air dehumidifier combined with heat pump system and solid desiccant plates

提出一种热泵驱动的住宅用固体除湿新风机组。该机组采用两级除湿和再生,每级由两个除湿板组成,分别位于被处理空气侧和再生空气侧,通过相互交换位置实现连续除湿。热泵系统的制冷量和排热量分别用于冷却被处理空气及加热再生空气。针对该机组建立相应数值模型并进行实验验证,模拟分析各级除湿板位置交换模式(模式1:同时交换位置;模式2:交替交换位置)、转换间隔(TI)、新风进口状态和级数对机组COP的影响。结果表明:该机组存在最优TI,模式2的最优TI是模式1的一半,风量为300 m3·h-1时模式1的最优TI为8 min,风量为500 m3·h-1时模式1的最优TI为4 min;随着级数增加,机组COP增加;新风进口越干燥、温度越低,机组COP越高。在北京夏季工况和ARI夏季工况下,COP分别高于3.5和5.5。

A new type of heat pump driven household outdoor air processor using solid desiccant is proposed. Two stages of square solid desiccant plates are used for dehumidification. For each stage, two desiccant plates are placed in the processed air duct for dehumidification and in the regeneration air duct. Continuous dehumidification is realized by exchanging positions of the desiccant plates in the two air ducts. The cooling capacity and exhaust heat of the heat pump are utilized to cool the processed air and provide regenerative heat to the desiccant. Numerical models and experimental validations of the air processor are discussed. The influences of switching modes（mode 1： exchange positions simultaneously; mode 2： exchange positions alternatively）, switching time interval, processed air inlet states, and stage number on the performance（COP） of air processor are numerically investigated. The results show that, the optimal time interval of mode 2 is half of that of mode 1. The optimal time intervals under mode 1 are 8 and 4 min, respectively, for air flow rates of 300 and 500 m3·h-1. COP enhances with the increase of stage number. The cooler and drier the processed air inlet state, the higher the COP. Under the Beijing summer condition and the ARI summer condition, COPs are above 3.5 and 5.5, respectively.