Modeling of a Combined Kalina and Organic Rankine Cycle System for Waste Heat Recovery from Biogas Engine

Converting waste heat into electricity has captured the interest of scientists for years because its enormous potential to improve energy efficiency and lessen environmental impacts. While there are numerous applications recover lost energy, they often not efficient or cheap enough make a real-world impact. The aim this study is develop recovery system recycling factory operating in Hatay, Turkey. We combined Kalina Cycle (KC) with Organic Rankine (ORC) extract exhaust gas jacket water from power engine. An ammonia–water mixture was selected as working fluid KC, while R123, R236ea R124 were chosen tested ORC. selection fluids made based on certain impacts such global warming ozone depletion potential, without further exploring other options, which could be considered limitation study. optimal values KC parameters, including mass fraction, turbine inlet pressure temperature, found 90%, 430 °C 90 bar, respectively. then ORC using three different fluids, among R123 yielded best results. net power, exergy thermal cycle calculated 211.03 kW, 52.83% 26.50%, respectively, payback period estimated 4.2 years. It should noted that applicability domain obtained results limited climate conditions studied here. concluded combination can efficiently used energy.