This paper presents a methodology for performance acceptance testing of solar boilers using Linear Fresnel Reflectors (LFR) with Direct Steam Generation (DSG). The proposed methodology is based on relevant ISO and American standards applying an adapted parameter identification technique. Discussions regarding measurement requirements and uncertainty analysis are also provided. This methodology will be eventually consolidated thanks to real operational data on next LFR power plants.

The wind effect on the Fresnel technology is one of the main design stresses for the metallic structure, primary reflectors, receivers and solar tracking system. Therefore, in order to quantify its impact and compare it to a more mature technology (the Parabolic Trough), a first study of the wind load on a Linear Fresnel Reflector (LFR) collector with an air-stable absorber tube receiver (with protective cover glass) has been undertaken. The drag, lift and momentum coefficients of the receiver and primary reflectors have been calculated using a bi-dimensional CFD model based on the COMSOL Multiphysics® software. The impact of the transversal wind speed has been studied. Moreover, the interaction between the receiver and the primary reflectors has been quantified. Finally, a comparison to Parabolic Trough collectors has been made, which confirms the much lower wind load of LFR technology for an equal mirror aperture area, and thus the much lighter structures required for resisting these wind loads and/or the larger operation range with respect to wind speed.

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