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Optimum performance of the small-scale open and direct solar thermal Brayton cycle at various environmental conditions and constraints

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  • Le Roux, W.G.
  • Bello-Ochende, T.
  • Meyer, J.P.

Abstract

The Brayton cycle's heat source can be obtained from solar energy instead of the combustion of fuel. The irreversibilities of the open and direct solar thermal Brayton cycle with recuperator are mainly due to heat transfer across a finite temperature difference and fluid friction, which limit the net power output of such a system. In this work, the method of total entropy generation minimisation is applied to optimise the geometries of the receiver and recuperator at various steady-state weather conditions. For each steady-state weather condition, the optimum turbine operating point is also found. The authors specifically investigate the effect of wind and solar irradiance on the maximum net power output of the system. The effects of other conditions and constraints, on the maximum net power output, are also investigated. These include concentrator error, concentrator reflectivity and maximum allowable surface temperature of the receiver. Results show how changed solar beam irradiance and wind speed affect the system net power output and optimum operating point of the micro-turbine. A dish concentrator with fixed focal length, an off-the-shelf micro-turbine and a modified cavity receiver is considered.

Suggested Citation

  • Le Roux, W.G. & Bello-Ochende, T. & Meyer, J.P., 2012. "Optimum performance of the small-scale open and direct solar thermal Brayton cycle at various environmental conditions and constraints," Energy, Elsevier, vol. 46(1), pages 42-50.
  • Handle: RePEc:eee:energy:v:46:y:2012:i:1:p:42-50
    DOI: 10.1016/j.energy.2012.03.034
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    References listed on IDEAS

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    11. Loni, R. & Kasaeian, A.B. & Askari Asli-Ardeh, E. & Ghobadian, B., 2016. "Optimizing the efficiency of a solar receiver with tubular cylindrical cavity for a solar-powered organic Rankine cycle," Energy, Elsevier, vol. 112(C), pages 1259-1272.
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