Performance enhancement of solar distillation system with hemispherical projections and low-cost coating on absorber plate

Solar distillation systems are environmentally compassionate and valuable for water purification in water-fed regions. Nevertheless, it has a huge surface area need and deprived energy efficiency. Energy efficiency, surface area and cost are three crucial factors influencing the dissemination of this device to communities. The present study proposes a solar distiller for widespread users using a low-cost, high-absorbent absorber plate coating. In addition, a novel absorber plate design (plate with hemispherical projections) was used to provide more surface area for heat transfer. Experimental investigations show that blackboard paint and blackboard paint with 30% aluminium oxide nanoparticles are the most effective oil paints for absorber plate coating to avoid costly selective absorber coatings. This will contribute to developing low-cost distillers. The highest and lowest average temperatures were observed for blackboard paint with aluminium oxide nanoparticles (86.1 degrees C) and eyeliner (74 degrees C). Even pure blackboard paint was too appropriate, with an average temperature of 79.7 degrees C. Testing indicates that the most energy-efficient solar distiller design is an absorber plate with hemispherical projections coated with blackboard paint containing aluminium oxide nanoparticles. This research concludes that a blackboard-pained absorber plate with hemispherical projections should be used to build energy-efficient and cost-effective solar distillation equipment.