Wednesday, August 16th, 2017

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

Publication year: 2011brbSource:/b Energy, In Press, Corrected Proof, Available online 1 September 2011brW.G., Le Roux , T., Bello-Ochende , J.P., MeyerbrThe 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…br Highlights: ► Optimum geometries exist such that the system produces maximum net power output. ► Optimum operating conditions are shown. ► Minimum irreversibility rates and minimum entropy generation rates are shown. ► Net power output was described in terms of total entropy generation rate. ► Effects such as wind, recuperator height and irradiance were investigated.

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