Thermal Performance Evaluation of Coconut Coir Fiber Multi-Layer Insulation in Elevated Water Storage Tanks

Elevated water storage tanks in tropical climates are susceptible to significant heat gain, leading to elevated water temperatures and reduced utility. This study experimentally evaluates a coconut coir Fiber-based multi-layer insulation system comprising an inner virgin plastic tank, coconut coir Fiber, polyurethane foam, and an outer protective plastic layer. Two identical 15-liter tanks—insulated and non-insulated—were monitored under ambient summer conditions with hourly temperature measurements. Results demonstrate that the insulated tank significantly mitigates peak temperature rise, enhancing thermal stability. The combination of coconut coir Fiber and polyurethane foam provides effective thermal resistance while maintaining cost-efficiency and sustainability. This system offers a practical, eco-friendly solution for controlling heat gain in elevated water storage tanks.