DESIGN AND FABRICATION OF A PARABOLIC SOLAR DRYER

Drying is a critical process in preserving agricultural products, yet conventional methods often face inefficiencies, high costs, and environmental drawbacks. In Nigeria, where post-harvest losses exceed 40% due to inadequate drying techniques, this study addresses the urgent need for sustainable solutions by designing, fabricating, and evaluating a parabolic solar dryer optimized for local climatic conditions. The parabolic solar dryer leverages concentrated solar energy to enhance drying efficiency, reduce energy consumption, and improve product quality compared to traditional sun drying. Key design considerations included material reflectivity, thermal insulation, airflow optimization, and adaptability to Nigeria’s high solar irradiance. The methodology encompassed material selection, prototype fabrication, and performance evaluation under real-world conditions. Temperature, humidity, drying time, and energy efficiency were systematically monitored using digital sensors. Results demonstrated a significant reduction in drying time and improved moisture removal rates, while maintaining the nutritional and sensory qualities of agricultural products. The system’s cost-effectiveness and reliance on renewable energy make it accessible to smallholder farmers, aligning with Nigeria’s food security and sustainability goals. Economic analysis revealed that the parabolic solar dryer offers a high return on investment by minimizing post-harvest losses and operational costs. Environmental benefits include reduced carbon emissions and decreased reliance on non-renewable energy sources. Case studies from Nigeria and similar regions underscored the technology’s potential to transform agricultural practices, particularly in resource-limited settings. Challenges such as initial costs and weather dependency were acknowledged, with hybrid systems proposed as future enhancements. This study concludes that parabolic solar dryers represent a viable, scalable solution to Nigeria’s post-harvest challenges. By integrating locally available materials and advanced design principles, the dryer not only preserves food quality but also empowers rural communities economically. The findings advocate for broader adoption of solar drying technologies to enhance food security, reduce waste, and promote sustainable agricultural development in tropical regions.