مقايسه سيكل هاي رانكين و كالينا و بررسي اكسرژي در سيكل كالينا

Comparison Between Rankine and Kalina Cycles and Exergy Study of The Kalina Cycle

Energy - Utilization Diagrams is a graphic method to describe the exergy losses in industrial processes, i.e., improving the exei gy use. We apply the method to a 3MW kalina bottoming Cycle. In the Kalina cycle, thermal energy transforms to mechanical energy and we can change the thermal losses to useful mechanical energy at best efficiency in comparison with another thermal machines. In this cycle against Rankine cycle, the ammonia-water mixture is used as fluid., therefore by suitable setting of this two fluids in various points of the cycle ,we could give optimum total efficiency and since we have two type of fluids ,should consider additional equipment in this cycle. The Kalina Cycle is being developed as a competitive improvement of the Rankine steam Cycle. By using an ammonia --water mixture as the working fluid and a condensing system based on absorption refrigeration principles the Kalina bottoming Cycle becomes about 10% more efficient than the ordinary Rankine Cycle. The Energy-Utilization Diagram of the kalina Cycle is very tight. From this we see that the Cycle is very well optimized.