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A regulation strategy of working concentration in the dehumidifier of liquid desiccant air conditioner

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  • Wu, Qiong
  • Cai, WenJian
  • Shen, Suping
  • Wang, Xinli
  • Ren, Haoren

Abstract

This study presents a new desiccant concentration regulation strategy for the dehumidifier of a liquid desiccant air conditioner (LDAC). Starting from the mass balance principle, the proposed strategy supplies the strong solution in an intermittent manner to maintain the required working concentration, and the dehumidification rate is monitored as the feedback to improve the regulation performance. Compared with the conventional method, this new solution transfer strategy avoids the continuously solution exchanging, while allows multiple dehumidifiers to work simultaneously with only one regenerator. A mathematical model emphasizing on the concentration profiles is developed to determine the parameters of the proposed strategy. Simulations and experiments are conducted to evaluate the effectiveness of this strategy in different working conditions. The results prove that the proposed strategy can keep the working concentration at the pre-specified range with less energy consumption during the solution transfer. With this strategy, conventional LDAC can be extended to a mode with multiple dehumidifiers and one regenerator for large-scale applications in buildings.

Suggested Citation

  • Wu, Qiong & Cai, WenJian & Shen, Suping & Wang, Xinli & Ren, Haoren, 2017. "A regulation strategy of working concentration in the dehumidifier of liquid desiccant air conditioner," Applied Energy, Elsevier, vol. 202(C), pages 648-661.
    • Handle: RePEc:eee:appene:v:202:y:2017:i:c:p:648-661
    DOI: 10.1016/j.apenergy.2017.05.128
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    6. Wang, C. & Zhu, Y. & Qu, J. & Hu, H.D., 2018. "Automatic air temperature control in a container with an optic-variable wall," Applied Energy, Elsevier, vol. 224(C), pages 671-681.
    7. Juan Prieto & Antonio Atienza-Márquez & Alberto Coronas, 2021. "Modeling and Dynamic Simulation of a Hybrid Liquid Desiccant System with Non-Adiabatic Falling-Film Air-Solution Contactors for Air Conditioning Applications in Buildings," Energies, MDPI, vol. 14(2), pages 1-20, January.
    8. Liu, Wei & Gong, Yanfeng & Niu, Xiaofeng & Shen, Junjie & Kosonen, Risto, 2019. "Dynamic modeling of liquid-desiccant regenerator based on a state–space method," Applied Energy, Elsevier, vol. 240(C), pages 744-753.
    9. Zhang, Ning & Yin, Shao-You & Li, Min, 2018. "Model-based optimization for a heat pump driven and hollow fiber membrane hybrid two-stage liquid desiccant air dehumidification system," Applied Energy, Elsevier, vol. 228(C), pages 12-20.
    10. Thu, K. & Mitra, S. & Saha, B.B. & Srinivasa Murthy, S., 2018. "Thermodynamic feasibility evaluation of hybrid dehumidification – mechanical vapour compression systems," Applied Energy, Elsevier, vol. 213(C), pages 31-44.
    11. Ou, Xianhua & Cai, Wenjian & He, Xiongxiong & Zhai, Deqing, 2018. "Experimental investigations on heat and mass transfer performances of a liquid desiccant cooling and dehumidification system," Applied Energy, Elsevier, vol. 220(C), pages 164-175.
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