Compared with recirculation and injection modes, once-through direct steam generation (DSG) parabolic troughs are simpler to construct and require the lowest investment. However, the heat transfer fluid (HTF) in once-through DSG parabolic trough systems has the most complicated dynamic behavior, particularly during periods of moving shadows caused by small clouds and jet contrails. In this paper, a nonlinear distributed parameter dynamic model (NDPDM) is proposed to model the dynamic behavior of once-through DSG parabolic trough solar collector row under moving shadow conditions. Compared with state-of-the-art models, the proposed NDPDM possesses three characteristics: (a) adopting real-time local values of the heat transfer and friction resistance coefficients, (b) simulating the whole collector row, including the boiler and the superheated sections, and (c) modeling the disturbance of direct normal irradiance (DNI) level on DSG parabolic trough solar collector row under moving shadow conditions. Validated using experimental data, the NDPDM accurately predicts the dynamic characteristics of HTF during periods of partial and moving DNI disturbance. The fundamental and specific dynamic process of fluid parameters for a DSG parabolic trough solar collector row is provided in this paper. The results show the following: (a) Moving shadows have a significant impact on the outlet temperature and mass flow rate, and the impact lasts up to 1000 s even after the shadows completely leave the collector row. (b) The time for outlet steam temperature to reach a steady-state value for the first time is independent of the shadow width, speed, and moving direction. (c) High-frequency chattering of the outlet mass flow rate can be observed under moving DNI disturbance and will have a longer duration if the shadow width is larger or the shadow speed is slower. Compared with cases in which the whole system is shaded, partially shading cases have shown a longer duration of high-frequency chattering. (d) Both wider widths and slower speeds of shadow will cause a larger amplitude of responses in the outlet temperature and mass flow rate. When the shadow speed is low, there is a longer delay time of response in the mass flow rate of the outlet fluid. (e) The amplitude of response in the outlet temperature does not depend on the direction of clouds movement. However, if the DNI disturbance starts at the inlet of the collector row, there will be significant delay times in both outlet temperature and mass flow rate, and a larger amplitude of response in outlet mass flow rate.
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August 2017
Research-Article
The Dynamic Behavior of Once-Through Direct Steam Generation Parabolic Trough Solar Collector Row Under Moving Shadow Conditions
Su Guo,
Su Guo
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: guosu81@126.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: guosu81@126.com
Search for other works by this author on:
Yinghao Chu,
Yinghao Chu
Department of Mechanical
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ychu@ucsd.edu
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ychu@ucsd.edu
Search for other works by this author on:
Deyou Liu,
Deyou Liu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: liudyhhuc@163.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: liudyhhuc@163.com
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Xingying Chen,
Xingying Chen
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: xychen@hhu.edu.cn
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: xychen@hhu.edu.cn
Search for other works by this author on:
Chang Xu,
Chang Xu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zhuifengxu@163.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zhuifengxu@163.com
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Carlos F. M. Coimbra,
Carlos F. M. Coimbra
Department of Mechanical
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ccoimbra@ucsd.edu
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ccoimbra@ucsd.edu
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Ling Zhou,
Ling Zhou
College of Water Conservancy
and Hydropower Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zlhhu@163.com
and Hydropower Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zlhhu@163.com
Search for other works by this author on:
Qunming Liu
Qunming Liu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: hhulqm@126.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: hhulqm@126.com
Search for other works by this author on:
Su Guo
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: guosu81@126.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: guosu81@126.com
Yinghao Chu
Department of Mechanical
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ychu@ucsd.edu
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ychu@ucsd.edu
Deyou Liu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: liudyhhuc@163.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: liudyhhuc@163.com
Xingying Chen
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: xychen@hhu.edu.cn
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: xychen@hhu.edu.cn
Chang Xu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zhuifengxu@163.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zhuifengxu@163.com
Carlos F. M. Coimbra
Department of Mechanical
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ccoimbra@ucsd.edu
and Aerospace Engineering,
Jacobs School of Engineering,
Center for Renewable Resource Integration/
Center for Energy Research,
University of California,
San Diego,
San Diego, CA 92093
e-mail: ccoimbra@ucsd.edu
Ling Zhou
College of Water Conservancy
and Hydropower Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zlhhu@163.com
and Hydropower Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: zlhhu@163.com
Qunming Liu
College of Energy and Electrical Engineering,
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: hhulqm@126.com
Hohai University,
Nanjing, Jiangsu 210098, China
e-mail: hhulqm@126.com
1Corresponding author.
Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received October 4, 2016; final manuscript received February 26, 2017; published online April 25, 2017. Assoc. Editor: Marc Röger.
J. Sol. Energy Eng. Aug 2017, 139(4): 041002 (9 pages)
Published Online: April 25, 2017
Article history
Received:
October 4, 2016
Revised:
February 26, 2017
Citation
Guo, S., Chu, Y., Liu, D., Chen, X., Xu, C., Coimbra, C. F. M., Zhou, L., and Liu, Q. (April 25, 2017). "The Dynamic Behavior of Once-Through Direct Steam Generation Parabolic Trough Solar Collector Row Under Moving Shadow Conditions." ASME. J. Sol. Energy Eng. August 2017; 139(4): 041002. https://doi.org/10.1115/1.4036331
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