Comparative Analysis of a Cost-Effective Solar Nano Al2O3 Coating Exhibiting Superior Solar Absorption Efficiency over Box-Behnken Design

The study focuses on assessing the outcome attributes of solar flat plate collectors employing various preferable surface coatings. These collectors are pivotal in harnessing solar energy, utilizing air or water as the operative mediums. In both residential and commercial settings, flat plate collectors serve multiple purposes, generating heat adequate for warming swimming pools, domestic water, and edifices. They even possess the capability to power cooling systems, especially when sunlight exposure is amplified through reflectors. These collectors can effortlessly achieve temperatures up to 70 degrees Celsius. A newly developed cost-effective solar preferable coating, exhibiting superior solar absorption outcome in contrast to conventional black paint coatings used in typical Solar Water Heating Systems (SWHSs), has been introduced. This membrane involves the integration of metallic particles, predominantly AL2O3, into black paint, with variations in ratios (1g, 1.5g, and 2g), applied on three distinct flat plate collectors. Throughout this research, efficiency was evaluated for al203 nanocoating and keeping flat plate collectors at varying tilt angles (15°, 30°, and 45°) and diverse flow rates (60, 90, and 120 kg/hr).