Effect of angle of incidence of sun rays on the bending of absorber tube of solar parabolic trough concentrator

Sourav Khanna*, Suneet Singh, Shireesh B. Kedare

*Corresponding author for this work

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Abstract

In a parabolic trough system, the solar flux distribution on the surface of absorber tube is non-uniform which results in circumferential temperature gradient. Thus, bending moment is induced and leads to the deflection in absorber tube from the focal line of trough. It is concluded that during zero angle of incidence of sun rays (angle made by sun rays with trough's aperture normal), absorber tube will not deflect from the focal line. However, during non-zero angle of incidence, the absorber tube will deflect. It is because of the fact that during non-zero angle of incidence, the absorber tube does not receive any concentrated flux near the end facing the sun. In the current work, an analytical expression is derived for finding the deflection in the central axis of absorber tube from the focal line of trough. Results for deflection are plotted for different values of angle of incidence taking the dimensions of LS3 parabolic trough with Schott 2008 PTR70 receiver.

Original languageEnglish
Pages (from-to)123-129
Number of pages7
JournalEnergy Procedia
Volume48
DOIs
Publication statusPublished - 1 Apr 2014
Event2nd International Conference on Solar Heating and Cooling for Buildings and Industry - Freiburg, Germany
Duration: 23 Sep 201325 Sep 2013

Keywords

  • Absorber tube
  • Bending
  • Parabolic trough

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