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Combining horizontal evacuated tubes with booster mirror reflector to achieve seasonal reverse output: Technical and experimental investigation

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  • Chen, Xiaomeng
  • Yang, Xudong
  • Li, Muran

Abstract

Owing to seasonal fluctuations in solar radiation resources and ambient air temperature, stationary solar collectors have higher output in summer and lower output in winter. However, seasonal heating demand and hot water usage follows an opposite pattern, resulting in insufficient heating in winter and the risk of overheating in summer, reducing the feasibility of solar thermal technology. In this study, a new configuration that combines horizontal evacuated tubes with a mirror reflector was developed to achieve seasonal reverse performance: high performance in winter and low performance in summer. In contrast to conventional collectors, the collector plane of this new module was inversely inclined, pointing to the solar altitude angle on the summer solstice. Together with the bottom mirror reflector, the normal vector of the composed aperture plane was designed to point to the solar altitude angle on the winter solstice. Through experimental and numerical studies, we found that the standardized thermal efficiency of the new module on the winter solstice was comparatively high because it can be regarded as a concentrating collector with a concentration ratio of 0.77. On the summer solstice, the thermal efficiency was extremely reduced due to 100% self-shading of the collector plane. Based on the idea of overcoming the seasonal instability of renewable resources, this designed solar module is expected to enhance the competitiveness of solar heating technology, especially in the decentralized clean heating market.

Suggested Citation

  • Chen, Xiaomeng & Yang, Xudong & Li, Muran, 2022. "Combining horizontal evacuated tubes with booster mirror reflector to achieve seasonal reverse output: Technical and experimental investigation," Renewable Energy, Elsevier, vol. 188(C), pages 450-464.
    • Handle: RePEc:eee:renene:v:188:y:2022:i:c:p:450-464
    DOI: 10.1016/j.renene.2022.02.041
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    References listed on IDEAS

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    1. Zhijian Liu & Kejun Liu & Hao Li & Xinyu Zhang & Guangya Jin & Kewei Cheng, 2015. "Artificial Neural Networks-Based Software for Measuring Heat Collection Rate and Heat Loss Coefficient of Water-in-Glass Evacuated Tube Solar Water Heaters," PLOS ONE, Public Library of Science, vol. 10(12), pages 1-16, December.
    2. Kabeel, A.E. & Khalil, A. & Elsayed, S.S. & Alatyar, A.M., 2015. "Modified mathematical model for evaluating the performance of water-in-glass evacuated tube solar collector considering tube shading effect," Energy, Elsevier, vol. 89(C), pages 24-34.
    3. Mao, Chunliu & Li, Muran & Li, Na & Shan, Ming & Yang, Xudong, 2019. "Mathematical model development and optimal design of the horizontal all-glass evacuated tube solar collectors integrated with bottom mirror reflectors for solar energy harvesting," Applied Energy, Elsevier, vol. 238(C), pages 54-68.
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