Parameter analysis of radiation transmission in volumetric receiver

In this work, a Monte Carlo Ray Tracing computation program is built to simulate the solar radiation transmission process in the volumetric receiver, which can be used to calculate the local heat flux distribution in the absorber. According to the characteristics of the radiation propagation in the solar air receiver, the system parameters will directly influence the distribution of the heat ux. In the following, the influences of the different parameters, including the incident angle, the shape and thickness of absorber, optical property (μ_a=μ_t) and porosity of absorber et al., on the local heat flux in the receiver are investigated. The computation results show that the incident angle and shape of absorber are the main influence factors of heat flux distribution. Furthermore, as the increase of absorber porosity or decrease of the ratio of μ_a=μ_t, the absorbed radiation energy distributes more uniformly and the maximum heat flux of the absorber decreases greatly. The results obtained in this work will provide the basis for selecting the appropriate materials for the solar receiver and optimizing the design of the system structures.