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Investigation on solar assisted liquid desiccant dehumidifier and evaporative cooling system for fresh air treatment

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  • Chen, Yi
  • Yang, Hongxing
  • Luo, Yimo

Abstract

The widely used semi-centralized air conditioning (A/C) system consisting of independent fresh air system and fan coil system suffers from huge energy consumption, especially for fresh air treatment. Therefore, a liquid desiccant dehumidifier and regenerative indirect evaporative cooling (LDD-RIEC) system is proposed for fresh air treatment. The fresh air is handled by the LDD-RIEC system in which no electricity-intensive compressor involves. The hot and humid fresh air is firstly dehumidified by LDD and then sensibly cooled by RIEC. The thermal energy captured by solar collectors is used for desiccant solution regeneration. Indoor return air is cooled by fan coils of a mechanical cooling system. The system performance is analyzed by solving the heat and mass transfer equations of each component integrally in a closed loop. Focus is placed on discussing the influences of solar collector area and inlet air conditions, and optimizing the extraction air ratio of RIEC. The energy saving ratio is quantitatively evaluated with respect to a conventional A/C system. Results reveal that the optimal extraction ratio is 0.3 considering the interacted influence of dehumidifier, regenerator, RIEC and solar collector. The energy saving ratio ranges from 22.4% to 53.2% under various inlet air conditions.

Suggested Citation

  • Chen, Yi & Yang, Hongxing & Luo, Yimo, 2018. "Investigation on solar assisted liquid desiccant dehumidifier and evaporative cooling system for fresh air treatment," Energy, Elsevier, vol. 143(C), pages 114-127.
    • Handle: RePEc:eee:energy:v:143:y:2018:i:c:p:114-127
    DOI: 10.1016/j.energy.2017.10.124
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    3. Açıkkalp, Emin & Caliskan, Hakan & Hong, Hiki & Piao, Hongjie & Seung, Dohyun, 2022. "Extended exergy analysis of a photovoltaic-thermal (PVT) module based desiccant air cooling system for buildings," Applied Energy, Elsevier, vol. 323(C).
    4. Gao, D.C. & Sun, Y.J. & Ma, Z. & Ren, H., 2021. "A review on integration and design of desiccant air-conditioning systems for overall performance improvements," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    5. Beccali, M. & Finocchiaro, P. & Ippolito, M.G. & Leone, G. & Panno, D. & Zizzo, G., 2018. "Analysis of some renewable energy uses and demand side measures for hotels on small Mediterranean islands: A case study," Energy, Elsevier, vol. 157(C), pages 106-114.
    6. Dong, Chuanshuai & Lu, Lin & Wen, Tao, 2018. "Investigating dehumidification performance of solar-assisted liquid desiccant dehumidifiers considering different surface properties," Energy, Elsevier, vol. 164(C), pages 978-994.
    7. Chen, Yi & Yan, Huaxia & Yang, Hongxing, 2018. "Comparative study of on-off control and novel high-low control of regenerative indirect evaporative cooler (RIEC)," Applied Energy, Elsevier, vol. 225(C), pages 233-243.
    8. Liang, Jyun-De & Huang, Bo-Hao & Chiang, Yuan-Ching & Chen, Sih-Li, 2020. "Experimental investigation of a liquid desiccant dehumidification system integrated with shallow geothermal energy," Energy, Elsevier, vol. 191(C).
    9. Jiangjiang Wang & Rujing Yan & Zhuang Wang & Xutao Zhang & Guohua Shi, 2018. "Thermal Performance Analysis of an Absorption Cooling System Based on Parabolic Trough Solar Collectors," Energies, MDPI, vol. 11(10), pages 1-17, October.
    10. Yang, Zili & Tao, Ruiyang & Ni, Hui & Zhong, Ke & Lian, Zhiwei, 2019. "Performance study of the internally-cooled ultrasonic atomization liquid desiccant dehumidification system," Energy, Elsevier, vol. 175(C), pages 745-757.
    11. Ji Li & Yuanwei Liu & Ruixue Zhang & Zhijian Liu & Wei Xu & Biao Qiao & Xiaomei Feng, 2018. "Load Distribution of Semi-Central Evaporative Cooling Air-Conditioning System Based on the TRNSYS Platform," Energies, MDPI, vol. 11(5), pages 1-15, May.
    12. Li, Hongxuan & Zou, Tonghua & Han, Xiaowan & Dai, Baomin & Liu, Jia, 2023. "Numerical and experimental study on the regeneration performance of a liquid desiccant system coupled with rotating packed bed and vacuum," Applied Energy, Elsevier, vol. 336(C).
    13. Qing Cheng & Han Wang & Lin Zhu & Yao Chen, 2023. "A current efficiency model coupled with desiccant molecular weight for electrodialysis regeneration in liquid desiccant air-conditioning systems," Energy & Environment, , vol. 34(4), pages 909-926, June.
    14. Oh, Seung Jin & Shahzad, Muhammad Wakil & Burhan, Muhammad & Chun, Wongee & Kian Jon, Chua & KumJa, M. & Ng, Kim Choon, 2019. "Approaches to energy efficiency in air conditioning: A comparative study on purge configurations for indirect evaporative cooling," Energy, Elsevier, vol. 168(C), pages 505-515.
    15. Yang, Hongxing & Shi, Wenchao & Chen, Yi & Min, Yunran, 2021. "Research development of indirect evaporative cooling technology: An updated review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).

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