Economic Analysis of a Hybrid Solar-Biogas Refrigeration System for Dairy Applications

This study investigates the performance and economic feasibility of a hybrid solar-biogas-powered vapour absorption refrigeration system tailored for dairy applications. Refrigeration is essential for preserving dairy products, and the integration of renewable energy sources offers a sustainable alternative to conventional methods. A 50-liter capacity hybrid refrigeration system was designed, utilizing heat energy derived from solar radiation and biogas combustion. The system's performance was assessed through experimental tests under varying conditions, and its coefficient of performance (COP) was evaluated for full-load scenarios. The economic analysis focused on parameters such as net present value (NPV), benefit-cost ratio (BCR), internal rate of return (IRR), and payback period. Results indicate that the hybrid system offers substantial energy savings and environmental benefits. Among the approaches analyzed, the solar water heater and biogas combination demonstrated the highest economic returns, although the biogas-only system proved more practical in maintaining the required generator temperatures. This study underscores the potential of hybrid energy systems in advancing sustainable refrigeration solutions.