THERMODYNAMIC ANALYSIS AND MODIFICATION OF SUPERCRITICAL ORGANIC RANKINE CYCLE WITH R600 AND CARBON DIOXIDE AS WORKING FLUID

• Main Author: Wijaya, Elgin
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/77231
• Institution: Institut Teknologi Bandung

Electric energy is an energy that is used in the world to help people’s daily lives. Indonesia is ranked 5th as one of the countries with the most electric energy consumption with consumption of 281.53 TWh in 2021. Power plant industry in Indonesia is the largest contributor to carbon dioxide emissions which is still dominated by fossil fuels power plants. The solution pushed by Indonesia is to use clean alternative sources of energy such as geothermal energy. Currently, 18 geothermal power plants have been built which contribute 2.13 MW of electricity. In Indonesia, there is lack of utilization of low to moderate permeability and temperature reservoir. Carbon Plume Geothermal is a concept that utilizes supercritical carbon dioxide as a working fluid which is suitable for reservoir with low to moderate permeability and sedimentary basin as geothermal energy sources. This CPG concept use organic Rankine cycle which is suitable for reservoir with low temperature with R600 as working fluid to generate power and supercrtical carbon dioxide as geothermal receiving medium. In this research, five modifications of organic Rankine cycle have been developed. The best modification which is supecritical dual cycle with regenerator is chosen to be applied at Dondang geothermal resource in Kutai, East Kalimantan. The simulation of the modification produces a net power of 3428.55 kW and cycle efficiency of 32.83%. The estimated capital cost is 123.6 million dollars with LCOE of 0.180 USD/kWh and a payback period of 13.7 years.