Performance Evaluation of a Solar Dryer with Flat Plate Collector for Efficient Grape Dehydration

This study investigates the effectiveness of a solar dryer utilizing an FPC system for the dehydration of grapes. The study aims to assess the efficiency of the dryer under different environmental conditions. A flat plate collector, measuring 2 meters in length and 0.8 meters in width, was chosen to capture solar energy. This heated air is directed through an insulated drying chamber containing three mesh trays with stainless steel material. Experimental results demonstrated a substantial temperature rise within the dryer, reaching up to 80°C, driven by effective solar radiation capture. Solar radiation and relative humidity measurements revealed a significant correlation between midday solar peaks and optimal drying conditions. Moisture removal followed a rapid initial phase, transitioning to a slower, steady phase, with drying rates aligning with standard solar drying behaviors. The overall efficiency peaked during midday, underscoring the dryer’s capability to maintain effective drying environments. This study validates the solar dryer’s design, demonstrating its potential for efficient, sustainable dehydration of agricultural products. Future work should focus on optimizing dryer design and material selection to further enhance performance and efficiency.