Numerical Investigation of Convective Heat Loss from Upward Facing Cavity Receivers of Different Shapes at Different Inclinations and Temperatures

  • Kumara S
  • Shendageb D
  • b P
  • et al.
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Abstract

Scheffler solar concentrator system is commonly used system in India. It is used for industrial process heat, cooking and power generation. It utilizes an upward facing cavity receiver fixed at local latitude. In the present work, upward facing cavity receivers are analysed numerically to study heat loss by natural convection for different shapes. CFD analysis is carried out onto 0.5 m diameter cylindrical cavity for isothermal wall temperatures (600 K, 725 K, 850 K and 950 K) and varied inclinations (θ = 0˚, 19˚(19˚(latitude of Mumbai), 40˚, 60˚, 70ånd 80˚). The heat loss is observed to increase almost linearly with increase in surface temperature. Moreover, for a fixed wall temperature, the convective heat loss increases with angle upto 70˚inclination70˚inclination angle and then decreases. The result for cylindrical cavity is compared with cubical, spherical and hemispherical cavities of equal aperture and depth. It is observed that a) in terms of utilization of solar flux, the cylindrical cavity is about 5% more efficient than spherical cavity b) and the hemispherical cavity has the highest convective heat loss.

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APA

Kumara, S., Shendageb, D. J., b, P. D., Kedare a, S. B., & Bapat, S. L. (2019). Numerical Investigation of Convective Heat Loss from Upward Facing Cavity Receivers of Different Shapes at Different Inclinations and Temperatures. Journal of Energy and Environmental Sustainability, 8, 7–11. https://doi.org/10.47469/jees.2019.v08.100082

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