Design and Analysis of 180 kW Turbin Radial Inflow using Supercritical Carbon Dioxide as Working Fluid

• Main Author: Iswari - 13114045, Arif
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25767
• Institution: Institut Teknologi Bandung

Supercritical carbon dioxide (S-CO2) is a fluid state where it is above its critical temperature and critical pressure (31 &#8451; and 7,38 MPa). Supercritical carbon dioxide has high density and good heat transfer capacity, expanding to fill its container like a gas but with density like that of a liquid. The choice of supercritical carbon dioxide as working fluid of Brayton cycle provides for more efficient compression compared to other fluid. Therefore, the net output power as well as the overall cycle efficiency of tha plant increases. Supercritical carbon dioxide can effectively reduce the cost of manufacturing the components due to its high fluid density, S-CO2 enables extremely compact turbomachinery. <br /> <br /> The aims of this final project is to design a 180 kW turbine radial inflow using supercritical carbon dioxide as working fluid. The mass flow rate of 2,50 kg/s, inlet total pressure and total temperature respectively of 14,3 MPa and 815 K, and outlet static pressure of 8 MPa at 70.000 RPM was used as known parameters. Meanline analysis obtained total-to-static efficiency of 82,36 % and power of 179,35 kW with rotor diameter of 36,16 mm and contains 16-pieces of blade. After a spesific turbine was designed and analyzed using meanline analysis, the flow was analyzed using ANSYS-CFX, a three-dimensional Computational Fluid Dynamics (CFD) code. CFD result are in fairly good agreement with meanline analysis. CFD analysis show that the designed turbine is able to generate power 175, 02 kW with total-to-static efficiency of 81,37 % and mass flow of 2,51 kg/s.