HYDROTHERMAL MODELING IN GEOTHERMAL SYSTEM USING COMSOL MULTIPHYSICS

• Main Author: CHANDRA MAHAPUTERA (NIM : 10212065), QIVA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23746
• Institution: Institut Teknologi Bandung

In this modern era, energy become one of the most important need to fulfill to keep human life. One of the source of energy that can used is geothermal energy. When geothermal energy exploitation conducted, the information about condition of the soil and reservoir temperature are required. Heat transfer proses that conduct in geothermal system are conduction and convection. Computation modelling is required to get the information about factors that influence the geothermal exploitation process. Hydrothermal model that made by heat transfer and Darcy equation module inside COMSOL Multiphysics gave data about the hydrothermal condition below earth surface. This research obtained heat distribution for 60 years from reference model and Waikite field. Data that obtained from reference model can modelling heat transfer by conduction and convection. This modelling show reservoir temperature that decreased. Initial reservoir temperature is 80oC and become 72.5oC in 25 years. The highest temperature in reference model is 80oC that shows bed rock temperature and the lowest temperature is 30oC that shows the ambient temperature. Beside the reference model, modelling for Waikite, New Zealand, field are conducted. From Waikite field modelling obtained heat distribution for 60 years. Temperature distribution shows that decreasing reservoir temperature is happened. The initial temperature in Waikite field reservoir is 98.5oC but after ambient temperature fluid is injected, the reservoir temperature is decreasing until reach 98.4oC for 60 years. The highest temperature in reference model is 98.5oC that shows bed rock temperature and the lowest temperature is 7.7oC that shows the ambient temperature Waikite field. This modelling shows that along with the fluid is flowing the temperature of soil beside the pipe is changing.