Study of Cost Effective Solar Selective Surface for Spiral Concentrator

Abstract

Solar selective surface has great importance in practical uses in solar energy thermal techniques. In this attempt, the use of lamp black + SiO2 in different proportions as selective coating has been studied. Efforts have been taken to know whether the amount of SiO2 in the mixture could be used to enhance the efficiency of the spiral concentrating type solar cooker. Spraying technique has been used for coating the material over the absorber. The absorber material used was Aluminium. Water heating tests were carried out during summer season. The Study revealed the fact that the amount of SiO2 in SiO2 lamp black mixture would decide the value of overall efficiency of the spiral concentrator and its performance. The studies were carried out in the natural weather conditions.