Performance Analysis of a Transcritical-Carbon-Dioxide Heat Pump-Driven Deep-Dehumidification System Using Ionic Liquid Desiccant

  • YANG Bai ,
  • WANG Yikai ,
  • CAO Bowen ,
  • YIN Yonggao ,
  • ZHANG Fan ,
  • WANG Xinming
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  • 1. School of Energy and Environment, Southeast University, Nanjing 210096, China
    2. Engineering Research Center for Building Energy Environment & Equipments, Ministry of Education, Southeast University, Nanjing 210096, China
    3. Evonik Japan Co., Ltd., 2-3-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-0938, Japan

Online published: 2025-05-06

Supported by

This work is financially supported by the National Natural Science Foundation of China (Grant number 52076039).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Abstract

Traditional salt solutions, due to their susceptibility to crystallization and corrosion, can be replaced by ionic liquids (ILs) to enhance the effectiveness of liquid desiccant dehumidification systems. This study proposes integrating a transcritical-carbon-dioxide heat pump (TCHP) with an IL dehumidification cycle, thereby providing both cooling and heating for IL under large temperature differentials. Thermodynamic analysis is conducted to investigate the influence of key design parameters. The findings reveal that the TCHP is capable of handling the significant temperature rise during IL regeneration. The evaporation temperature is the key factor for matching the supply and demand of cooling and heating in the system. The self-circulation ratio of the solution is limited by the regeneration temperature. When the initial air humidity ratio is 8.0 g/kg and the supply air humidity ratio is 1.0 g/kg, the proposed system’s total heat COP is 31.9% higher than that of the reference systems.

Cite this article

YANG Bai , WANG Yikai , CAO Bowen , YIN Yonggao , ZHANG Fan , WANG Xinming . Performance Analysis of a Transcritical-Carbon-Dioxide Heat Pump-Driven Deep-Dehumidification System Using Ionic Liquid Desiccant[J]. Journal of Thermal Science, 2025 , 34(3) : 1117 -1128 . DOI: 10.1007/s11630-025-2105-6

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