An Experimental Study on Improving Solar-Based Distillation Productivity Through the Utilization of Split AC-Condenser Heat

Population growth and the limited availability of freshwater have indeed raised concerns about the supply of clean drinking water and its impact on public health. Solar-based distillation techniques have gained recognition as sustainable solutions for freshwater production in arid regions. However, their efficiency often suffers from inconsistent solar radiation patterns. This study explores an innovative approach to enhance the productivity of solar-based distillation systems by harnessing the condenser heat generated by split air conditioning (AC) units. During the month of April 2023 in Prayagraj, India, the maximum temperature of the 1.5-ton Split AC-condenser reached 52.4 °C, with an average temperature difference of 26 °C between the condenser and the ambient environment. This surplus heat was effectively utilized within a single slope solar distillation unit (SSSDU) through a conical duct made of FRP (Fiber Reinforced Plastic). This utilization significantly increased the evaporation rate of the distillation unit and improved its average thermal efficiency by 15% during sunlight hours. Furthermore, observations conducted during night-time while the split AC was still operating revealed continued potable water production, demonstrating the effective performance of the system because of fast condensation rate due to lower ambient temperature.