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Influence of concentration difference between dilute cells and regenerate cells on the performance of electrodialysis regenerator

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  • Cheng, Qing
  • Zhang, Xiaosong
  • Jiao, Shun

Abstract

Air-conditioning systems consume a large proportion of energy consumption in buildings, which leads to an important significance of energy-saving in air-conditionings. For liquid desiccant air-conditioning system, a new air-conditioning with good energy-saving potential, electrodialysis (ED) can be a reliable regeneration method, which cannot be affected by hot and wet air. In this paper, an ED regeneration experimental system was conducted to investigate actual effect of concentration difference between dilute and regenerate cells on the performance of ED regenerator. The results show that increase of concentration difference is harmful to performance of ED regenerator. Moreover, decrease of liquid desiccant flow rate in regenerate cells can be a solution to add concentration increase in regenerate cells even when concentration difference is big, but it is harmful to current efficiency of ED regenerator and COP of liquid desiccant air-conditioning system based on ED regeneration. On the other hand, as current efficiency and COP finally tends to be stable with the increase of current and concentration difference, the “final” current efficiency and COP may only depend on liquid desiccant concentration, the structure of ED regenerator and characteristics of membranes, which should be improved to optimize the performance of ED regenerator.

Suggested Citation

  • Cheng, Qing & Zhang, Xiaosong & Jiao, Shun, 2017. "Influence of concentration difference between dilute cells and regenerate cells on the performance of electrodialysis regenerator," Energy, Elsevier, vol. 140(P1), pages 646-655.
    • Handle: RePEc:eee:energy:v:140:y:2017:i:p1:p:646-655
    DOI: 10.1016/j.energy.2017.09.003
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    1. Guo, Yi & Al-Jubainawi, Ali & Peng, Xueyuan, 2019. "Modelling and the feasibility study of a hybrid electrodialysis and thermal regeneration method for LiCl liquid desiccant dehumidification," Applied Energy, Elsevier, vol. 239(C), pages 1014-1036.
    2. She, Xiaohui & Cong, Lin & Nie, Binjian & Leng, Guanghui & Peng, Hao & Chen, Yi & Zhang, Xiaosong & Wen, Tao & Yang, Hongxing & Luo, Yimo, 2018. "Energy-efficient and -economic technologies for air conditioning with vapor compression refrigeration: A comprehensive review," Applied Energy, Elsevier, vol. 232(C), pages 157-186.
    3. Pei, Wang & Cheng, Qing & Jiao, Shun & Liu, Lin, 2019. "Performance evaluation of the electrodialysis regenerator for the lithium bromide solution with high concentration in the liquid desiccant air-conditioning system," Energy, Elsevier, vol. 187(C).
    4. Liu, Hongdou & Yang, Hongquan & Qi, Ronghui, 2020. "A review of electrically driven dehumidification technology for air-conditioning systems," Applied Energy, Elsevier, vol. 279(C).
    5. Qing Cheng & Han Wang, 2020. "Experimental Research on Regeneration Characteristic of ED Regeneration for Lithium Bromide Desiccant Solution with High Concentration: Operating Condition and Electrode Solution," Energies, MDPI, vol. 13(18), pages 1-14, September.

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