Optimization and Simulation of a Solar-MCHP Hybrid Dryer for Renewable Energy-Powered Drying of Mentha piperita L. across Diverse Climatic Conditions

The drying process of medicinal plants, such as Mentha piperita L. (peppermint), is critical for preserving their bioactive compounds. Traditional drying methods often rely on fossil fuel-based systems, raising environmental concerns. This study integrates a solar dryer with a micro-combined heat and power (MCHP) system to provide a sustainable drying solution. Experimental drying at ۴۰–۶۰ °C and airflow rates of ۰.۵–۱.۵ m/s was optimized using Response Surface Methodology (RSM), identifying ۵۷.۲۸ °C and ۱.۵ m/s as the optimal conditions for maximizing phenolic and flavonoid contents, as well as antioxidant capacity. Practical simulations across three Iranian climates showed that PID-controlled integration reduced auxiliary energy demand by ۴۸.۳۲% while maintaining thermal stability within ±۰.۵ °C. Annual collector efficiencies reached ۴۰.۴۳% (Shahrekord), ۴۴.۲۹% (Kerman), and ۴۵.۹۰% (Bushehr), with a peak monthly efficiency of ۵۲.۷۹% in September. TOPSIS analysis identified Kerman and Bushehr as the most suitable locations based on solar stability. These quantitative results demonstrate the industrial viability of the system, offering an energy-efficient and environmentally friendly approach to high-quality medicinal plant processing across diverse climatic conditions.

کلیدواژه ها:

Renewable Energy ، Solar dryers ، CHP ، Simulation ، solar collector ، Mentha piperita L