Abstract The internally-cooled liquid-desiccant (ICLD) air-conditioning system has gained more attention, owing to its energy-efficient performance. In this study, two restriction factors of the conventional heat-pump driven ICLD system are revealed: (i) heat and mass transfer driving force reversal phenomena exist in the dehumidifier (DEH) and regenerator (REG), which deteriorate the moisture efficiencies of the DEH and REG; (ii) considerable heat-cold offset occurs during solution exchanging between the DEH and REG. To avoid the driving force reversal phenomena, the system I with a pre-cooler/heater before the DEH/REG is proposed. The COPsys of the system I is 8.2%–15.0% greater than that of the conventional ICLD system, under variable conditions. To reduce the heat-cold offset to further improve the system performance, the system II is then proposed. In the proposed system II, 20% of the original DEH/REG is changed from the original internally-cooled type into the adiabatic type. The hybrid DEH and REG help to reduce the temperature difference between the outlet solutions of the DEH and REG, and thus, the heat-cold offset in the system is reduced. Consequently, COPsys of the proposed system II is 11.0%–19.5% greater than that of the conventional system, under variable conditions.

中文翻译：

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内冷液体干燥剂系统传热传质驱动力逆转和冷热抵消的重要性

摘要 内冷式液体干燥剂（ICLD）空调系统因其节能性能而受到越来越多的关注。在这项研究中，揭示了传统热泵驱动 ICLD 系统的两个限制因素：(i) 除湿器 (DEH) 和再生器 (REG) 中存在传热和传质驱动力反转现象，这降低了湿气效率。 DEH 和 REG；(ii) 在 DEH 和 REG 之间的溶液交换过程中发生了相当大的热-冷偏移。为了避免驱动力反转现象，提出了在 DEH/REG 之前带有预冷器/加热器的系统 I。在可变条件下，系统 I 的 COPsys 比传统 ICLD 系统的 COPsys 大 8.2%–15.0%。为了减少热冷偏移以进一步提高系统性能，然后提出系统II。在提议的系统 II 中，原来的 DEH/REG 的 20% 由原来的内冷型改为绝热型。混合DEH和REG有助于减少DEH和REG出口溶液之间的温差，从而减少系统中的冷热偏移。因此，在可变条件下，所提出的系统 II 的 COPsys 比传统系统的 COPsys 大 11.0%–19.5%。