Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator

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dc.contributor.author Le Roux, Willem Gabriel
dc.contributor.author Bello-Ochende, Tunde
dc.contributor.author Meyer, Josua P.
dc.date.accessioned 2011-11-22T10:16:06Z
dc.date.available 2011-11-22T10:16:06Z
dc.date.issued 2011-10
dc.description.abstract The small-scale open and direct solar thermal Brayton cycle with recuperator has several advantages, including low cost, low operation and maintenance costs and it is highly recommended. The main disadvantages of this cycle are the pressure losses in the recuperator and receiver, turbomachine efficiencies and recuperator effectiveness, which limit the net power output of such a system. The irreversibilities of the solar thermal Brayton cycle are mainly due to heat transfer across a finite temperature difference and fluid friction. In this paper, thermodynamic optimisation is applied to concentrate on these disadvantages in order to optimise the receiver and recuperator and to maximise the net power output of the system at various steady-state conditions, limited to various constraints. The effects of wind, receiver inclination, rim angle, atmospheric temperature and pressure, recuperator height, solar irradiance and concentration ratio on the optimum geometries and performance were investigated. The dynamic trajectory optimisation method was applied. Operating points of a standard micro-turbine operating at its highest compressor efficiency and a parabolic dish concentrator diameter of 16 m were considered. The optimum geometries, minimum irreversibility rates and maximum receiver surface temperatures of the optimised systems are shown. For an environment with specific conditions and constraints, there exists an optimum receiver and recuperator geometry so that the system produces maximum net power output. en_US
dc.description.sponsorship University of Pretoria and the National Research Foundation (NRF-DST). en_US
dc.description.uri http://www.sciencedirect.com/science/journal/03605442 en_US
dc.identifier.citation Le Roux, WG, Bello-Ochende, T & Meyer JP 2011, 'Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator', Energy, vol. 36, no. 10, pp. 6027-6036. en_US
dc.identifier.issn 0360-5442 (print)
dc.identifier.issn 1873-6785 (online)
dc.identifier.other 10.1016/j.energy.2011.08.012
dc.identifier.uri http://hdl.handle.net/2263/17626
dc.language.iso en en_US
dc.publisher Elsevier B.V. en_US
dc.rights © 2011 Elsevier B.V. en_US
dc.subject Solar en_US
dc.subject Brayton en_US
dc.subject Optimisation en_US
dc.subject Geometry en_US
dc.subject Receiver en_US
dc.subject Recuperator en_US
dc.subject.lcsh Solar thermal energy en
dc.subject.lcsh Brayton cycle en
dc.subject.lcsh Heat engineering en
dc.subject.lcsh Heat -- Transmission en
dc.subject.lcsh Heat-engines -- Thermodynamics en
dc.subject.lcsh Heat exchangers -- Thermodynamics en
dc.subject.lcsh Turbomachines -- Thermodynamics en
dc.subject.lcsh Entropy en
dc.title Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator en_US
dc.type Postprint Article en_US


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