Experimental investigation of a counter-flow heat pump driven liquid desiccant dehumidification system
Experimental investigation of a counter-flow heat pump driven liquid desiccant dehumidification system
复制标题
逆流热泵驱动液体干燥剂除湿系统的实验研究
DOI：
10.1016/j.enbuild.2018.09.007
复制
发表时间：
2018-11
影响因子：
6.7
通讯作者：
Cong Lin
中科院分区：
文献类型：
--
作者：
Liu Xiaohua;Xie Ying;Zhang Tao;Chen Liangliang;Cong Lin
逆流热泵液体除湿(HPLD)系统具有效率高、结构简单等优点，被认为是湿空气处理过程中的一种节能方法。研究发现，采用多级热泵循环可以改善系统性能，并对采用两级热泵循环的HPLD系统的系统性能进行了实验研究。根据实验结果，阐述了溶液流量、进风参数(包括新风和室内排风)以及系统的补水量对系统性能的影响。研究发现，溶液流量会影响新风与室内排气之间的热回收性能，进而影响热泵的性能。因此，这种逆流HPLD系统存在一个最佳溶液流量，在实验条件下，系统的性能系数(COEYOS)可高达6.5。此外，在系统有足够的室内排风量的情况下，增加新风入口参数和减少室内排风入口参数对系统性能都有良好的影响，从而促进了系统的热回收性能。而增加补水能力以消除系统多余的供热能力，也将主要通过降低冷凝温度来改善系统性能。然而，由于除湿需求，系统的补充水量不能增加太多。此外，这种逆流HPLD系统的性能系数比横流HPLD系统高约30%，可以处理更多的除湿需求。
A counter-flow heat pump driven liquid desiccant dehumidification (HPLD) system is considered as an energy-efficient approach for the humid air handling process, with advantages in terms of higher efficiency and simpler configuration. It is found that the adoption of a multi-stage heat pump cycle can improve the system performance, and then experimental tests for the system performance of the HPLD system with a two-stage heat pump cycle are investigated in the present study. The effects of solution flow rate, air inlet parameters including outdoor air and indoor exhaust air, and supplementary water capacity for the system on the system performance are elucidated according to the experimental results. It is found that the solution flow rate could affect the heat recovery performance between outdoor air and indoor exhaust air, and the performance of the heat pump. Thus, there exists an optimal solution flow rate for this counter-flow HPLD system, and the coefficient of performance of the system (COPsys) can be as high as 6.5 under the experimental condition. Besides, the increase of outdoor air inlet parameters and the decrease of indoor exhaust air inlet parameters with enough indoor exhaust air flow rate for the system have favorable effects on the system performance, due to the promotion to the heat recovery performance of the system. And more supplementary water capacity to remove the redundant heating capacity of the system would also improve the system performance mainly through lowering the condensing temperature. However, supplementary water capacity cannot be added too much for the system due to the dehumidification demand. Furthermore, the coefficient of performance of this counter-flow HPLD system is approximately 30% higher than that of a cross-flow HPLD system, handling more dehumidification demand.
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