Preparation, characterization and evaluation of thermal efficacy of nano carbon-MnO₂ coated solar absorber

The development of nanostructured solar absorbers and their utilization in applied solar devices are the need of the hour and hence the present research. The research results revealed that nano carbon and MnO₂ coated absorbers could be developed by spray coating method. The research results also revealed that the crystallite sizes in the coatings of carbon and MnO₂ based absorbers were in nano ranges. The observation on research results revealed that the thermal durability and thermal efficacy of the nano carbon and MnO₂ coated absorbers (in 70:30 ratio) were acceptable in connection with their utilization in the solar collectors. As the thermal durability and efficacy of nano carbon and MnO₂ coated absorbers were acceptable, it could be concluded that nano carbon and MnO₂ coated absorbers would be integrated in solar collectors so as to improve their thermal performances. (author)