2.1. Concentrator and absorber parameters
The STSC is illustrated in Fig. 2, and it was previously designed in 2013 [16]. In this study, for coupling with a 3 kWe Stirling engine, the SCTS dimensions are: 3.98 m reflector diameter, 5.04 m focal length and 45° rim angle. The absorber parameters of a Stirling engine were previously established in 2013 [17]. Those parameters were: 0.0064 m2 absorber area and 0.0063 m outside diameter of the tubes.