OPTIMUM DESIGN OF RADIAL-INFLOW TURBINE FOR 30KW R32 ORGANIC RANKINE CYCLE

• Main Author: Waliyudin Mudhofar, Rozan
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/73642
• Institution: Institut Teknologi Bandung

Need for utilizing clean, renewable, and abundant energy source has brought utilization of low-grade heat into attention in power generation especially in decentralized grid power generation. Low-grade heat source is available in many kind of form, e.g. waste heat of thermal system, solar, geothermal, and biomass. For such purpose, the organic rankine cycle system is best solution in converting low-grade heat for power generation. By utilizing organic fluid, ORC system is able to utilize low-grade heat and mid-grade heat which is available in relatively low temperature, where conventional steam Rankine and open-gas cycles cannot provide viable, sustainable, techno-economic solution. In ORC, turbine is one of critical component and is needed to perform well and reach high efficiency. For micro-scale power generation purpose, which is desired for decentralized power generation, the most suitable turbine is radial-inflow turbine. By its nature, radialinflow turbine is able to reach high efficiency if designed well. For reasons stated, good design of turbine and analysis of occurring flow need to be done to attain turbine with good performance and high efficiency. In this undergraduate thesis, program for predicting rotor performance for inserted input parameters is made. The program is then used for optimization process to obtain rotor preliminary design that perform with highest efficiency for ORC cycle with R32 as working fluid. The design process is then carried out until complete design for volute, nozzle, and rotor is obtained. The design is then modelled and CFD simulation is carried out. From performance prediction program it is predicted that the turbine will generate 31.6 kW with 84.5% efficiency. From CFD simulation, the turbine is able to generate 34.2 KW with 90.1% efficiency.