关键词: 吸附除湿, 热泵, 两级, 模型, 数值模拟, 实验验证, 性能分析

Abstract:

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.

Key words: adsorption dehumidification, heat pump, two-stage, model, numerical simulation, experimental validation, performance analysis