3. Results and discussion
3.1. Model resolution
The mathematical model is solved using a convergent approximation algorithm in which there is a proposed initial temperature of the cavity and the temperature will increase gradually to reach an energy balance in the cavity receiver. Initially the geometric dimensions and properties of the concentration system and environmental conditions are introduced. Then, the intercept factor of the concentrator, the energy delivered to the receiver and the energy transferred to the atmosphere by convection, radiation and conduction are calculated to finally obtain the amount of energy transferred to the fluid. The algorithm is implemented in the program Engineering Equation Solver (EES).