Parametric Study of Volumetric Absorber Performance

The promise and challenge of solar volumetric absorbers

“…The analysis developed here includes coupled modeling of all three modes of heat transfer, with careful consideration of realistic boundary conditions and of appropriate correlations for effective material properties. A previous version of this analysis (Kribus et al, 2013) has addressed the same question of performance limits, and the current work presents several major advances: a more accurate radiative model (discrete ordinates); a more realistic convective heat transfer correlation; and a more comprehensive presentation of trends in parameter space rather than just a few example cases. The absorber performance is investigated for a range of design parameters that define geometry and material properties, and the combinations of parameters that can lead to volumetric behavior are identified and evaluated.…”

Thermal Performance Analysis of High-temperature Heat Transfer Process of Solar Energy

“…Since the extinction coefficient decreases reversely with the porosity, solar radiation can penetrate into the receiver much deeper with a high porosity. Besides, the heat absorbed in the front region is removed by convection effectively [19]. These factors result in the temperature distribution.…”

Optical study of using ceramic foams for volumetric solar receivers

“…Regarding foam structure, different models have been used in order to compute the radiative term, such as the two flux approximation [6][7], the Rosseland diffusion equation [8][9] and the P-l model [10]. However, in the previous studies, the real geometry of the foam structure is not considered and simple representation of the structure as a porous media is employed.…”