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Transient characteristics of a parabolic trough direct-steam-generation process

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  • Li, Lu
  • Sun, Jie
  • Li, Yinshi
  • He, Ya-Ling
  • Xu, Haojie

Abstract

Solar-powered direct steam generation (DSG) is attractive for power generation and industrial utilization due to the combination of renewable-energy source and clean energy carrier. An improved SIMPLE algorithm ensuring the dual roles of pressure acting on velocity and density fields is developed to realize thermo-hydraulic completely-coupled modeling of a typical DSG loop with transient phase-change and multiple flow-patterns. The excitation-response characteristics of the loop were investigated under various step-variations of direct normal irradiance (DNI), inlet mass flowrate (min) and inlet temperature (tin). Increasing DNI (decreasing min) is found to narrow the preheating-evaporation regions and expand the superheating region, and vice versa. While under step-variations of tin, the evaporation region almost remains unchanged (about 403 m). The water slides to a lower temperature faster than climbs to a higher one under variations of DNI (up to 670s vs. 2960s) and min (up to 1184s vs. 4420s), simultaneously the outlet temperature (tout) staying a monotonical response-trend. However, under tin variations, tout holds a higher-order trait. The responses of both pressure and velocity are tightly coupled and always hold higher-order trait. The response time of the total mass in the loop is almost 2.5 to 5.5 times as fast as tout.

Suggested Citation

  • Li, Lu & Sun, Jie & Li, Yinshi & He, Ya-Ling & Xu, Haojie, 2019. "Transient characteristics of a parabolic trough direct-steam-generation process," Renewable Energy, Elsevier, vol. 135(C), pages 800-810.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:800-810
    DOI: 10.1016/j.renene.2018.12.058
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    References listed on IDEAS

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    Cited by:

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    2. Paolo Iodice & Giuseppe Langella & Amedeo Amoresano, 2020. "Exergetic Analysis of a New Direct Steam Generation Solar Plant Using Screw Expanders," Energies, MDPI, vol. 13(3), pages 1-19, February.
    3. Wang, Yongqing & Guo, Zhenning & Li, Lu & Gao, Fan & Wang, Ke & An, Bo, 2023. "Thermohydraulic management coupled with flow pattern distinction for concentrating solar direct-steam-generation technology," Renewable Energy, Elsevier, vol. 204(C), pages 114-130.
    4. Liu, Shang & Huang, Congliang & Luo, Xiao & Guo, Chuwen, 2019. "Performance optimization of bi-layer solar steam generation system through tuning porosity of bottom layer," Applied Energy, Elsevier, vol. 239(C), pages 504-513.
    5. Soares, João & Oliveira, Armando C. & Valenzuela, Loreto, 2021. "A dynamic model for once-through direct steam generation in linear focus solar collectors," Renewable Energy, Elsevier, vol. 163(C), pages 246-261.
    6. Gharat, Punit V. & Bhalekar, Snehal S. & Dalvi, Vishwanath H. & Panse, Sudhir V. & Deshmukh, Suresh P. & Joshi, Jyeshtharaj B., 2021. "Chronological development of innovations in reflector systems of parabolic trough solar collector (PTC) - A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
    7. Li, Lu & Li, Yinshi & Yu, Huajie & He, Ya-Ling, 2020. "A feedforward-feedback hybrid control strategy towards ordered utilization of concentrating solar energy," Renewable Energy, Elsevier, vol. 154(C), pages 305-315.
    8. Xia, En-Tong & Chen, Fei, 2020. "Analyzing thermal properties of solar evacuated tube arrays coupled with mini-compound parabolic concentrator," Renewable Energy, Elsevier, vol. 153(C), pages 155-167.

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