Modelling study for compact Fresnel reflector power plant

Abstract

This paper describes Compact Linear Fresnel Reflector (CLFR) concepts suitable for large scale solar thermal electricity generation plants. In the CLFR it is assumed that there will be many parallel receiver towers that are close enough for individual reflectors to have the option of directing reflected solar radiation to two linear receivers on separate towers. This additional variable in reflector orientation provides the means for much more densely packed arrays. Patterns of alternating reflector orientation can be set up such that closely packed reflectors can be positioned so that shading and blocking are almost eliminated. The avoidance of large reflector spacings and tower heights is an important cost issue in determining the cost of ground preparation, array substructure cost, tower structure cost, steam line thermal losses, and steam line cost. The improved ability to use the Fresnel approach delivers the traditional benefits of such a system, namely small reflector size, low structural cost, fixed receiver position without moving joints, and non-cylindrical receiver geometry. The modelled array also uses advanced all glass evacuated tubular absorbers with low emittance selective coatings.