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Energy consumption and optimization of internally cooled/heated liquid desiccant air-conditioning system: A case study in Hong Kong

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  • Qi, Ronghui
  • Lu, Lin

Abstract

LDAC (liquid desiccant air-conditioning system) is promising for reducing the energy consumption, and improving the indoor air quality. In this paper, the operation performance of LDAC with internally cooled/heated dehumidifier/regenerator was simulated and optimized. The cooling tower and solar collectors were employed as the cooling/heating source. Four nested iteration loops were developed and solved for system modeling. A typical commercial building in Hong Kong was selected as a case study, which air-conditioning load was obtained by Energy-plus. Results show that with the increase of solar collector area, the electricity consumption of AC (air-conditioning systems) system reduced by 11–35% in original system, but only a part of dehumidification demand was handled with liquid desiccant ventilation, which led to a low chiller COP (coefficient of performance). By adding a cooling coil for the solution entering dehumidifier, the electricity saving effectively increased to 22–47%, while the heat demand for regeneration also increased by 17%. So, a heat exchanger between water leaving regenerator and solution leaving dehumidifier was introduced. With the lower thermal requirement (reduced by 20%) and higher solar fraction (increased from 30 to 40%), the saving further increased to 29–49%, and the required collector area obviously reduced by 50–60% for the similar energy saving purpose.

Suggested Citation

  • Qi, Ronghui & Lu, Lin, 2014. "Energy consumption and optimization of internally cooled/heated liquid desiccant air-conditioning system: A case study in Hong Kong," Energy, Elsevier, vol. 73(C), pages 801-808.
    • Handle: RePEc:eee:energy:v:73:y:2014:i:c:p:801-808
    DOI: 10.1016/j.energy.2014.06.086
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    4. Yang, Zili & Zhang, Kaisheng & Lian, Zhiwei & Zhang, Huibo, 2016. "Sensitivity and stability analysis on the performance of ultrasonic atomization liquid desiccant dehumidification system," Energy, Elsevier, vol. 112(C), pages 1169-1183.
    5. 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.
    6. Wen, Tao & Lu, Lin, 2019. "A review of correlations and enhancement approaches for heat and mass transfer in liquid desiccant dehumidification system," Applied Energy, Elsevier, vol. 239(C), pages 757-784.
    7. Peng, Donggen & Luo, Danting & Cheng, Xiaosong, 2018. "Modeling and performance comparisons of the grading and single solar collector/ regenerator systems with heat recovery," Energy, Elsevier, vol. 144(C), pages 736-749.
    8. Wang, Yingying & Fan, Ying & Wang, Dengjia & Liu, Yanfeng & Qiu, Zhenghao & Liu, Jiaping, 2020. "Optimization of the areas of solar collectors and photovoltaic panels in liquid desiccant air-conditioning systems using solar energy in isolated low-latitude islands," Energy, Elsevier, vol. 198(C).
    9. Kim, Min-Hwi & Ham, Sang-Woo & Park, Jun-Seok & Jeong, Jae-Weon, 2014. "Impact of integrated hot water cooling and desiccant-assisted evaporative cooling systems on energy savings in a data center," Energy, Elsevier, vol. 78(C), pages 384-396.
    10. Wen, Tao & Lu, Lin & Li, Mai & Zhong, Hong, 2018. "Comparative study of the regeneration characteristics of LiCl and a new mixed liquid desiccant solution," Energy, Elsevier, vol. 163(C), pages 992-1005.
    11. 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.
    12. Song, Xia & Zhang, Lun & Zhang, Xiaosong, 2018. "NTUm-based optimization of heat or heat pump driven liquid desiccant dehumidification systems regenerated by fresh air or return air," Energy, Elsevier, vol. 158(C), pages 269-280.
    13. 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.
    14. Hernández-Romero, Ilse María & Fuentes-Cortés, Luis Fabián & Nápoles-Rivera, Fabricio, 2019. "Conditions accommodating a dominant stakeholder in the design of renewable air conditioning systems for tourism complexes," Energy, Elsevier, vol. 172(C), pages 808-822.

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