Liquid desiccant dehumidifiers (LDDs) can be improved by adding internal cooling. However, the addition of excessive cooling power may deteriorate the system‘s cost-efficiency, whereas the addition of insufficient cooling power leads to negligible performance improvements. The objective of this study is to determine the suitable cost-efficient cooling power range for improving the performance of internally cooled LDDs (IC-LDDs). A novel method and a set of criteria related to the moisture removal rate, cooling-power efficiency (ηc) and coefficient of dehumidification performance from cooling power (DCOPcooling) were proposed to determine cost-efficient cooling power. The internally cooled ultrasonic atomization liquid desiccant system (IC-UADS), together with a well-validated model based on the conservation laws of mass and energy and the sensible heat balance, was adopted to demonstrate the analysis. The results showed that, although the dehumidification performance improves with increasing cooling power, the improvement rate decreases, while ηcand DCOPcoolingdecline quickly (by 87.9%). For cost-efficient improvement, the necessary power proportion of internal cooling to the system‘s target dehumidification capacity tends to be stable, which was about 29% for the IC-UADS, and independent of the operating conditions. The results may help to determine the reasonable cooling power range for cost-efficient improvement of IC-LDDs.

中文翻译：

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确定经济高效的冷却功率范围，以提高内部冷却超声雾化液体干燥剂除湿机的性能

液体干燥剂除湿机 (LDD) 可以通过增加内部冷却来改进。然而，增加过多的冷却功率可能会降低系统的成本效率，而增加不足的冷却功率导致的性能改进可以忽略不计。本研究的目的是确定合适的经济高效的冷却功率范围，以提高内部冷却 LDD (IC-LDD) 的性能。提出了一种与水分去除率、冷却功率效率 (ηc) 和冷却功率除湿性能系数 (DCOPcooling) 相关的新方法和一组标准，以确定具有成本效益的冷却功率。内冷式超声波雾化液体干燥系统（IC-UADS），结合基于质量和能量守恒定律以及显热平衡的经过充分验证的模型，用于证明分析。结果表明，虽然除湿性能随着制冷功率的增加而提高，但改善率下降，而ηc和DCOPcooling下降较快（下降了87.9%）。为了提高成本效益，内部冷却对系统目标除湿能力的必要功率比例趋于稳定，IC-UADS 约为 29%，并且与运行条件无关。结果可能有助于确定合理的冷却功率范围，以实现 IC-LDD 的成本效益改进。改善率下降，而 ηcand DCOPcooling 迅速下降（下降了 87.9%）。为了提高成本效益，内部冷却对系统目标除湿能力的必要功率比例趋于稳定，IC-UADS 约为 29%，并且与运行条件无关。结果可能有助于确定合理的冷却功率范围，以实现 IC-LDD 的成本效益改进。改善率下降，而 ηcand DCOPcooling 迅速下降（下降了 87.9%）。为了提高成本效益，内部冷却对系统目标除湿能力的必要功率比例趋于稳定，IC-UADS 约为 29%，并且与运行条件无关。结果可能有助于确定合理的冷却功率范围，以实现 IC-LDD 的成本效益改进。