Performance Improvement of OTEC-ORC and Turbine Based on Binary Zeotropic Working Fluid

In this paper, the composition of binary nonazeotropic working fluids is explored from perspective improving OTEC-ORC efficiency, and turbine designed to accommodate with fluid. It found that using a R152a/R32 mixture as fluid significantly higher than thermal efficiency system pure NH3, optimal mixed determined be 85 : 15 2.8% 1.7%, respectively, by 35.7% 151.2% compared NH3 ORC. According fluid, one-dimensional (1-D) design CFD simulation analysis are carried out on turbine. The 1-D calculation results in good agreement three-dimensional (3-D) results. At point, output 83.84 kW, isentropic 87.53%. off-design turbines have better performance, indicating also has adaptability.