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Effect of Wind Flow on Convective Heat Losses from Scheffler Solar Concentrator Receivers

  • Anita Arvind NeneEmail author
  • S. Ramachandran
  • S. Suyambazhahan
Original Contribution

Abstract

Receiver is an important element of solar concentrator system. In a Scheffler concentrator, solar rays get concentrated at focus of parabolic dish. While radiation losses are more predictable and calculable since strongly related to receiver temperature, convective looses are difficult to estimate in view of additional factors such as wind flow direction, speed, receiver geometry, prior to current work. Experimental investigation was carried out on two geometries of receiver namely cylindrical and conical with 2.7 m2 Scheffler to find optimum condition of tilt to provide best efficiency. Experimental results showed that as compared to cylindrical receiver, conical receiver gave maximum efficiency at 45° tilt angle. However effect of additional factors like wind speed, wind direction on especially convective losses could not be separately seen. The current work was undertaken to investigate further the same two geometries using computation fluid dynamics using FLUENT to compute convective losses considering all variables such at tilt angle of receiver, wind velocity and wind direction. For cylindrical receiver, directional heat transfer coefficient (HTC) is remarkably high to tilt condition meaning this geometry is critical to tilt leading to higher convective heat losses. For conical receiver, directional average HTC is remarkably less to tilt condition leading to lower convective heat loss.

Keywords

Solar energy Scheffler concentrator Scheffler receiver Wind direction Thermal efficiency Convective losses 

Notations

CFD

Computational fluid dynamics

Fm

Heat removal factor

HTC

Heat transfer coefficient

Ibn

Direct solar radiation, W/m2

Ta

Ambient air temperature, °C

Tin

Inlet water temperature, °C

Tout

Outlet water temperature, °C

Tm

Mean temperature, °C

Ul

Overall heat transfer coefficient, W/m2K

ηo

Optical efficiency

Notes

Acknowledgement

The authors are grateful to University of Pune for providing necessary fund to carry out the research work.

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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  • Anita Arvind Nene
    • 1
    Email author
  • S. Ramachandran
    • 1
  • S. Suyambazhahan
    • 2
  1. 1.Sathyabama Institute of Science and TechnologyChennaiIndia
  2. 2.Qassim UniversityBuraydahSaudi Arabia

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