Desiccant Performance Evaluation of Desiccant-Coated Heat Exchanger-Based Heat Pump by Equilibrium Model

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  • School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

网络出版日期: 2023-11-26

基金资助

This work was supported by the National Key Research and Development Program of China (Grant No. 2020YFB1506300). We thank the support from the Analytical & Testing Center of Huazhong University of Science and Technology.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Desiccant Performance Evaluation of Desiccant-Coated Heat Exchanger-Based Heat Pump by Equilibrium Model

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  • School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Online published: 2023-11-26

Supported by

This work was supported by the National Key Research and Development Program of China (Grant No. 2020YFB1506300). We thank the support from the Analytical & Testing Center of Huazhong University of Science and Technology.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

结合干燥剂除湿和蒸气压缩制冷的优势,除湿换热器热泵(DCHE HP)被认为是传统蒸气压缩空调系统(VCAC)的有效替代方案之一。从众多备选中选择合适的干燥剂对于提高DCHE HP的性能至关重要。利用当前的实验或建模策略进行干燥剂筛选极具挑战。本研究开发了一个平衡态模型来评估39个使用不同干燥剂的DCHE HP在各种工况下的功耗。最终,选出了五种系统功耗较低的干燥剂。结果表明,在给定的工作条件下,基于这五种干燥剂的DCHE HP可比VCAC节省21.3%-32.9%的功耗。综合分析表明,DCHE HP的功耗在很大程度上取决于干燥剂的吸附热、循环吸附量和剩余含水量。进一步的,适中的吸附热、较大的循环吸附量和较低的剩余含水量有助于降低系统的能耗。本研究通过一个平衡态模型对39种可用于DCHE HP的干燥剂进行了快速评估,并为选择和设计适用于DCHE HP的干燥剂提供了见解。

本文引用格式

LIU Yuexin, LIU Zhilu, XIA Xiaoxiao, LI Wei, TU Zhengkai, CAI Shanshan, LI Song . Desiccant Performance Evaluation of Desiccant-Coated Heat Exchanger-Based Heat Pump by Equilibrium Model[J]. 热科学学报, 2023 , 32(6) : 2361 -2373 . DOI: 10.1007/s11630-023-1881-0

Abstract

By combining the advantages of desiccant dehumidification and vapor compression refrigeration, the desiccant-coated heat exchanger-based heat pump (DCHE HP) is regarded as a promising alternative to the traditional vapor-compression air conditioning system (VCAC). Selecting proper desiccants from a large number of candidates is of great importance to improve the performance of DCHE HP. However, this task is challenging using current experimental or modelling strategies. In this work, we developed an equilibrium model to evaluate the power consumption of 39 DCHE HPs coated with different desiccants under various operating conditions. Eventually, five desiccants with low power consumption were selected. It was also demonstrated that under given operating conditions, the DCHE HP based on the five selected desiccants can save 21.3%–32.9% power compared with the VCAC. The power consumption of the DCHE HP is largely dependent on the heat of adsorption, the cyclical water uptakes and the remained moisture contents of the coating desiccants. It was further revealed that the moderate heat of adsorption, the larger cyclical water uptake and the lower remained moisture content are preferable for reducing the system energy demand. This work reported a quick evaluation of 39 desiccants for DCHE HP by an equilibrium model, which may also offer insights into the choosing and designing of desiccants for DCHE HP.

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