Techno-economic Analysis of Heat Pump Assisted Solar Dryer for Krajood

Abstract

This study applies solar energy-assisted heat pumpdryer for Krajood. The prototype solar-assisted heat pump drying system was designed to evaluate heat transfer efficiency and to conduct economic analysis for potential implementation. In the study, temperatures of 45°C, 55°C, and 65°C were investigated. Experimental results indicated that the optimal drying temperature was 55°C, achieving a balance between energy efficiency and product quality. The solar-assisted heat pump drying system exhibited a specific energy consumption of 2.67 kWh/kg and a thermal efficiency of 22.13%. The drying time with the solar-assisted heat pump dryer (22 hours) for 10 kg of Krajood was proven to be shorter compared to open solar drying of Krajood (batch 24 h or 3 days). An economic analysis employing Net Present Value and payback period revealed significant economic benefits over a 5-year lifespan. The payback period for Krajood drying (2.9 years) aligned well with previous studies. These findings demonstrate the economic feasibility and potential of solar-assisted heat pump dryer for reducing postharvest losses of Krajood, particularly in developing countries.