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Effect of number of supports on the bending of absorber tube of parabolic trough concentrator

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  • Khanna, Sourav
  • Sharma, Vashi

Abstract

The circumferential non-uniformity in the temperature of absorber tube of parabolic trough leads to bending of the tube. The absorber tube is considered to be equidistantly supported at various points along the length. An analytical expression is presented in the current work for finding the bending and the results are compared with the experimental measurements. Further, the effect of number of supports and spacing between them on the shape of bent tube is analyzed using analytical equations. It is found that, keeping spacing between adjacent supports fixed, as number of supports and length of tube increase, the maximum bending does not vary beyond a certain length of tube. For the chosen system (keeping spacing between adjacent supports as 4 m), the results show that if lengths of tubes are larger than 16 m, the maximum bending remains same. The shape of bent tube is symmetric around the mid length. For one half of the tube, the bending is towards the vertex line of trough for the portion lying between 1st and 2nd support. It is away from the vertex line for the portion lying between 2nd and 3rd support and so on up to the mid length of the tube.

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  • Khanna, Sourav & Sharma, Vashi, 2015. "Effect of number of supports on the bending of absorber tube of parabolic trough concentrator," Energy, Elsevier, vol. 93(P2), pages 1788-1803.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:1788-1803
    DOI: 10.1016/j.energy.2015.10.020
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    References listed on IDEAS

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    Cited by:

    1. Idris Al Siyabi & Sourav Khanna & Senthilarasu Sundaram & Tapas Mallick, 2018. "Experimental and Numerical Thermal Analysis of Multi-Layered Microchannel Heat Sink for Concentrating Photovoltaic Application," Energies, MDPI, vol. 12(1), pages 1-25, December.
    2. Abbas, R. & Sebastián, A. & Montes, M.J. & Valdés, M., 2018. "Optical features of linear Fresnel collectors with different secondary reflector technologies," Applied Energy, Elsevier, vol. 232(C), pages 386-397.
    3. Fan, Man & You, Shijun & Xia, Junbao & Zheng, Wandong & Zhang, Huan & Liang, Hongbo & Li, Xianli & Li, Bojia, 2018. "An optimized Monte Carlo ray tracing optical simulation model and its applications to line-focus concentrating solar collectors," Applied Energy, Elsevier, vol. 225(C), pages 769-781.
    4. Khanna, Sourav & Newar, Sanjeev & Sharma, Vashi & Panigrahi, Pradipta Kumar & Mallick, Tapas K., 2018. "Deformation of receiver in solar parabolic trough collector due to non uniform temperature and solar flux distribution and use of bimetallic absorber tube with multiple supports," Energy, Elsevier, vol. 165(PA), pages 1078-1088.
    5. Amit K. Bhakta & Nitesh K. Panday & Shailendra N. Singh, 2018. "Performance Study of a Cylindrical Parabolic Concentrating Solar Water Heater with Nail Type Twisted Tape Inserts in the Copper Absorber Tube," Energies, MDPI, vol. 11(1), pages 1-15, January.

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