Combination of air-source heat pumps with liquid desiccant dehumidification of air
Combination of air-source heat pumps with liquid desiccant dehumidification of air
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DOI：
10.1016/j.enconman.2011.12.023
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发表时间：
2012-05
影响因子：
10.4
通讯作者：
Li Zhang;E. Hihara;M. Saikawa
中科院分区：
文献类型：
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作者：
Li Zhang;E. Hihara;M. Saikawa
本文提出了一种集成液体除湿的无霜空气源热泵系统，通过在空气进入室外换热器之前进行除湿来延缓结霜。从空气中去除的水被用来给房间加湿。模拟是在干球温度−7至5.5°C和相对湿度80%(取决于结霜条件)下进行的。结果表明，该系统的性能系数(COP)在2.6~2.9之间，比热泵供暖与电加热器加湿系统的COP提高了30~40%。结果表明，对于无霜运行模式，氯化锂水溶液浓度的最佳值为37%。在低空气温度、高相对湿度条件下，对液体除湿系统进行了实验研究。实验结果表明，除湿空气的露点降低了8℃，加湿空气的含湿量保持在81g kg−1，保证了热泵蒸发器的无霜运行，同时保证了室内湿度的舒适性。溶液的热负荷是溶液冷负荷的3-4.5倍，这与模拟部分给出的假设是一致的。计算的COPLHRU与实验结果的偏差在33%以内。
This paper proposes a frost-free air source heat pump system with integrated liquid desiccant dehumidification, in which frosting can be retarded by dehumidifying air before entering an outdoor heat exchanger. And the water removed from the air is used to humidify a room. Simulation is carried out at a dry-bulb temperature of −7 to 5.5°C and a relative humidity of 80% depending on the frosting conditions. The results show that the coefficient of performance (COP) is in the range of 2.6–2.9, which is 30–40% higher than that of heat pump heating integrated with an electric heater humidifying system. And it is found that the optimum value of the concentration of lithium chloride aqueous solution is 37% for the frost-free operation mode. Experiments are conducted for liquid desiccant system under low air temperature and high relative humidity conditions. Experimental results show that the dew point of the dehumidified air is decreased by 8°C and the humidity ratio of the humidified air is kept at 8.1gkg−1, which ensures the frost-free operation of the heat pump evaporator and the comfortable level of room humidity simultaneously. The heating load of solution is 3–4.5 times larger than cooling load of solution, which agrees with the assumption given at the part of the simulation. Furthermore, the deviations between the calculated COPLHRUand the experimental results are within 33%.