The model resolution consists of proposing a radius, for the reflector aperture area, and then this radius value is adjusted to obtain the quantity and quality of energy required by the 3 kWe Stirling engine, which corresponds to a thermal energy demand of 8423 W with a fluid temperature of 957 K, according to the study by Beltran et al. [33]. A radius of 1.96 m was found, which meets the quality and quantity of heat required by the Stirling engine. For this radius, the y-intercept value is 2.21 m, and the reflector diameter is 8.34 m for the parabola when considering a spacing of 0.25 m, as shown by Eq. (24).