mathematical model of a solar collector augmented by a flat plate above reflector: Optimum inclination of collector and reflector

In this study a theoretical analysis of a collector augmented by a bottom booster reflector is presented. An analytical model has
been developed and used to estimate the solar irradiation passing through the transparent cover of a flat collector, both with and
without a bottom reflector. The analytical model is based on the anisotropic sky model and takes into account a finite length
system with different angular configurations and reciprocal shading and reflections between reflector and collector. Computer
simulations have been carried out in order to find the optimum angles of the reflector with respect to the plane of the collector.
Optimal inclinations of the collector and reflector for each month at 39° N latitude have been identified.