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Performance analysis of a water-power combined system with air-heated humidification dehumidification process

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  • He, W.F.
  • Zhang, X.K.
  • Han, D.
  • Gao, L.

Abstract

Freshwater and power demand are necessary both for the life and production. This paper focus on the water-power combined system, in which the organic Rankine cycle (ORC) is integrated into the air-heated humidification dehumidification (HDH) desalination unit to satisfy the requirements of the freshwater and power coinstantaneously. Mathematical models of the energy balance within the HDH desalination and ORC power subsystem are presented, and the performance of the combined thermal system are demonstrated through numerical simulation. The calculated production of freshwater and power validate the practicability of the proposed combined platform. The simulation results show that peak values for the freshwater production, m˙pw=19.53kgh−1, and gained output ratio (GOR) of the HDH desalination system, GOR = 2.82, are obtained at the balance case, while the maximum power of the ORC subsystem, Wnet = 6.04 kW, arises at m˙sw/m˙da=9. Furthermore, the maximum value of ηWPCS = 94.86% is also obtained at the balance case. It is also illustrated that the elevation of the terminal temperature difference is effective to raise the generated power from the ORC subsystem although the final energy utilization efficiency will be influenced, and the maximum power output is raised from Wnet = 3.33 kW to Wnet = 8.17 kW while the relevant peak value of the total thermal efficiency, ηWPCS decreases from ηWPCS = 109.79% to ηWPCS = 86.89% with the increasing of the terminal temperature difference from ΔTe = 10 K to ΔTe = 20 K. The trend of the freshwater and power variation laws imply that the mass flow rate ratio should be determined according to the actual water and power demand during the design period.

Suggested Citation

  • He, W.F. & Zhang, X.K. & Han, D. & Gao, L., 2017. "Performance analysis of a water-power combined system with air-heated humidification dehumidification process," Energy, Elsevier, vol. 130(C), pages 218-227.
    • Handle: RePEc:eee:energy:v:130:y:2017:i:c:p:218-227
    DOI: 10.1016/j.energy.2017.04.136
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    References listed on IDEAS

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    1. Muthusamy, C. & Srithar, K., 2017. "Energy saving potential in humidification-dehumidification desalination system," Energy, Elsevier, vol. 118(C), pages 729-741.
    2. Tsai, Yu-Ching & Chiu, Chih-Pin & Ko, Fu-Kuang & Chen, Tzong-Chyuan & Yang, Jing-Tang, 2016. "Desalination plants and renewables combined to solve power and water issues," Energy, Elsevier, vol. 113(C), pages 1018-1030.
    3. Wang, Jiangfeng & Yan, Zhequan & Wang, Man & Ma, Shaolin & Dai, Yiping, 2013. "Thermodynamic analysis and optimization of an (organic Rankine cycle) ORC using low grade heat source," Energy, Elsevier, vol. 49(C), pages 356-365.
    4. Al-Weshahi, Mohammed A. & Anderson, Alexander & Tian, Guohong, 2014. "Organic Rankine Cycle recovering stage heat from MSF desalination distillate water," Applied Energy, Elsevier, vol. 130(C), pages 738-747.
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    Cited by:

    1. Mao, Yi & Zhang, Lei & Wan, Li & Stanford, Russell J., 2022. "Proposal and assessment of a novel power and freshwater production system for the heat recovery of diesel engine," Energy, Elsevier, vol. 240(C).
    2. Li, Yang & Huang, Xin & Peng, Hao & Ling, Xiang & Tu, ShanDong, 2018. "Simulation and optimization of humidification-dehumidification evaporation system," Energy, Elsevier, vol. 145(C), pages 128-140.
    3. Lawal, Dahiru U. & Qasem, Naef A.A., 2020. "Humidification-dehumidification desalination systems driven by thermal-based renewable and low-grade energy sources: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 125(C).

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