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Comparison of internally cooled and adiabatic liquid desiccant dehumidification-regeneration system

机译：内冷绝热干燥剂除湿再生系统的比较

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摘要

In the liquid desiccant dehumidification system, there are mainly two types of dehumidifier/regenerator: the adiabatic type, and the internally-cooled/heated type. Thus, it is valuable to compare the performance difference and application scope of these two types. A comparison between the two types should be conducted at a system level, rather than at a component level. Numerical and analytical models were adopted to investigate the performance difference of the two systems. The solution circulating flow rate was the key influencing factor of the performance difference. When m s /m a was approximately 1.1-1.3, the two systems showed similar performance. The internally-cooled system showed better performance under a small flow rate, because of the higher efficiency of the dehumidifier/regenerator and lower heat-cold offset. In contrast, the adiabatic system performed better under a large solution flow rate, owing to a more stable heat and mass transfer driving force. In addition, both systems showed larger efficiencies and higher coefficient of performance (COP) when the outdoor air was relatively dryer. However, the outdoor air status was found to have little influence on the performance difference between the two systems.
机译：在液体干燥剂除湿系统中，主要有两种类型的除湿/蓄热器：绝热型和内部冷却/加热型。因此，比较这两种类型的性能差异和应用范围很有价值。两种类型之间的比较应该在系统级别而不是组件级别进行。采用数值和分析模型来研究两个系统的性能差异。溶液循环流量是影响性能差异的关键因素。当m s / m a约为1.1-1.3时，两个系统表现出相似的性能。内部冷却系统在小流量下表现出更好的性能，这是因为除湿机/再生器的效率更高，热冷偏移量更低。相反，由于更稳定的传热和传质驱动力，绝热系统在较大的溶液流量下表现更好。此外，当室外空气相对干燥时，两种系统均显示出更高的效率和更高的性能系数（COP）。但是，发现室外空气状况对两个系统之间的性能差异影响很小。

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