Análisis de la radiación absorbida/ perdida de un absorbedor esférico concéntrico a una cavidad con una apertura al flujo solar

Abstract

View factors and radiative flows from a solar sub-system, which  is made up of a spherical absorber immersed into a spherical  cavity with an aperture towards several solar flows, are  mathematically obtained. Suitable values of view factors are  deduced and possible materials to build the solar sub system  are chosen considering their radiative properties. Additionally,  radiative loss/gain is calculated and absorber temperature is  iteratively estimated. Taking into account a couple of materials  to build the absorber-cavity: graphite-silver, respectively,  effects in graphs and tables are shown. As a result of having  the spherical absorber immersed into the cavity, an equality of  flows impinging absorber, 88% of thermal efficiency and 2% of  radiative loss are obtained under the given conditions.