How can optical design and system layout be optimized to increase the concentration of solar energy onto the heat transfer fluid and improve the overall efficiency of a CSP power plant?
To optimise the optical design and system layout, aperture area of the receiver and acceptance angle need to be analysed. That's depends on system dimensions, enviornment condition and refractive index of the receiver
@Rana Hamza Shakil's suggestion will help in detailed modelling.
COMSOL ray tracing tool will be helpful in this regard.