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Dynamic modeling of a liquid desiccant dehumidifier

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  • Li, Xian
  • Liu, Shuai
  • Tan, Kok Kiong
  • Wang, Qing-Guo
  • Cai, Wen-Jian
  • Xie, Lihua

Abstract

The liquid desiccant dehumidification system is becoming a hotspot in air dehumidification due to its promising prospects. Many models have been reported in the literature, but they are rarely applicable to control design due to various reasons. In this paper, a simplified dynamic model of liquid desiccant dehumidifier is proposed from a control point of view based on the heat and mass transfer principles, where the spatial differentials of fluid properties are approximated by discretization and dynamic interaction along the flow direction. Unknown model parameters are first estimated from static experimental data through the Levenberg-Marquardt algorithm and then refined from dynamic experimental data through the extended Kalman filter. The proposed model performs well in the experimental validation and is expected to be applied in a future control design and fault diagnosis application.

Suggested Citation

  • Li, Xian & Liu, Shuai & Tan, Kok Kiong & Wang, Qing-Guo & Cai, Wen-Jian & Xie, Lihua, 2016. "Dynamic modeling of a liquid desiccant dehumidifier," Applied Energy, Elsevier, vol. 180(C), pages 435-445.
    • Handle: RePEc:eee:appene:v:180:y:2016:i:c:p:435-445
    DOI: 10.1016/j.apenergy.2016.07.085
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    2. 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.
    3. Ángel M. Costa & Rebeca Bouzón & Diego Vergara & José A. Orosa, 2019. "Eco-friendly Pressure Drop Dehumidifier: An Experimental and Numerical Analysis," Sustainability, MDPI, vol. 11(7), pages 1-17, April.
    4. 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.
    5. Al Garni, Hassan Z. & Awasthi, Anjali, 2017. "Solar PV power plant site selection using a GIS-AHP based approach with application in Saudi Arabia," Applied Energy, Elsevier, vol. 206(C), pages 1225-1240.
    6. 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.
    7. Jiang, Yuliang & Wang, Xinli & Zhao, Hongxia & Wang, Lei & Yin, Xiaohong & Jia, Lei, 2020. "Dynamic modeling and economic model predictive control of a liquid desiccant air conditioning," Applied Energy, Elsevier, vol. 259(C).
    8. Su, Bosheng & Han, Wei & Sui, Jun & Jin, Hongguang, 2017. "A two-stage liquid desiccant dehumidification system by the cascade utilization of low-temperature heat for industrial applications," Applied Energy, Elsevier, vol. 207(C), pages 643-653.
    9. 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.
    10. 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.
    11. Islam, M.R. & Alan, S.W.L. & Chua, K.J., 2018. "Studying the heat and mass transfer process of liquid desiccant for dehumidification and cooling," Applied Energy, Elsevier, vol. 221(C), pages 334-347.
    12. Giampieri, Alessandro & Ma, Zhiwei & Ling-Chin, Janie & Bao, Huashan & Smallbone, Andrew J. & Roskilly, Anthony Paul, 2022. "Liquid desiccant dehumidification and regeneration process: Advancing correlations for moisture and enthalpy effectiveness," Applied Energy, Elsevier, vol. 314(C).

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