AFFECT OF 10% WT GALENA POWDER ON THE ABSORBITIVITY OF BLACK PAINT

Addition of Galena Powder to black paint with a range of particle size has been studied, as a developed selective solar absorber for domestic use for water heating system. The powder used was prepared from an ingot of Galena. Selective surfaces; pure aluminum, black paint, and mixture of black paint with galena powder having particle size range of about 250μm and less greater than 125μm at 10% wt were experimented. Temperature difference (?T) as a function of exposure time has been studied pertaining to the mixture of black paint with Galena powder. Furthermore, microstructure of the used bulk ingot of Galena was investigated by using SEM. An increase of about 5 0C of water temperature was gained by using the Galena powder compared with black paint. The results of this attempt of research showed that the maximum value of water temperature was around 95 0C in Al- Buraimi City, Sultanate of Oman.