DESIGN AND NUMERICAL SIMULATION OF TURBINE AND COMPRESSOR REGENERATIVE BRAYTON CYCLE WITH WORKING FLUID SUPERCRITICAL CARBON DIOXIDE (S-CO2)

• Main Author: Gunawan NIM: 23116015, Gad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27434
• Institution: Institut Teknologi Bandung

The potential of new and renewable energy in Indonesia is quite large and diverse. Biomass is one of the renewable energy that is almost everywhere. One way of using biomass is to use the Brayton Cycle with carbon dioxide working fluid in the supercritical phase. Carbon dioxide is abundant on earth and has a high density in the supercritical phase so that the size of the turbomachinery can be small. Thus the turbine, compressor and alternator can be made compact. The advantage of the Brayton Cycle is the use of a regenerator on the exit side of the turbine for heat recovery. <br /> <br /> This study aims to design radial inflow turbine and centrifugal compressor for the Regenerative Brayton Cycle. Turbine and compressor are designed to work at 70,000 rpm with a net power target of 40 kW. Regenerative Brayton Cycle with supercritical carbon dioxide working fluid (S-CO2) designed for turbine inlet temperature is 800 K, compressor inlet temperature is 320 K, and pressure ratio in turbine 1.63. Based on the design of the cycle, the power of the turbine and compressor power are 113.84 kW and 60.53 kW, respectively. Geometric design is carried out with an approach in accordance with some of the literature related to this research. CFD simulations are then performed on the results of the design of the turbine and compressor. The CFD simulation results of the radial inflow turbine shows the power produced is 113.28 kW and the isentropic efficiency is 81.63% and the power required for centrifugal compressor is 69.89 kW and the isentropic efficiency is 60.03% for the design conditions. Based on CFD simulation results, the net power generated is 43.39 kW.