ORGANIC RANKINE CYCLE ANALYSIS ON GEOTHERMAL-BASED POWER PLANT IN LUMUT BALAI, SOUTH SUMATRA

• Main Author: Fauzan, Raihan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/58844
• Institution: Institut Teknologi Bandung

The human population is increasing over time. The increasing population increases the demand for the necessities of human life, namely primary, secondary and tertiary needs. Increasing technological developments have an impact on human needs for energy, especially electrical energy. Currently Indonesia still relies on its electricity needs on fossil energy sources, especially coal. Indonesia needs to find a coal solution because coal cannot have a big impact on the surrounding environment. The use of renewable energy sources needs to be encouraged. One of the renewable energy sources that are widely available in Indonesia, especially in mountainous areas, is geothermal energy sources. The use of Organic Rankine Cycle (ORC) technology can encourage the utilization of low-medium temperature geothermal energy sources. In this research, a geothermal ORC generator was conducted with the research location in Lumut Balai, which is located in Penindai Village, Muara Enim Regency, South Sumatra Province. The source used is the exploration of LMB 1-2 wells with the surface of the well at an altitude of 1300 meters above sea level (masl). There are 3 situations in geothermal conditions that will be tested and used in this Final Project II. The first is geothermal fluid at 0 masl (a depth of 1,300 meters from the well surface), namely a pressure of 55 bar, a temperature of 206 ° C, and a discharge of 31,222 kg / s. Then the second is geothermal fluid at 200 masl (a depth of 1100 meters from the well surface), namely a pressure of 40 bar, a temperature of 203 ° C, and a discharge of 31,222 kg / s. Then the third is the geothermal fluid at -200 masl (a depth of 1500 meters from the well surface), namely a pressure of 72 bar, a temperature of 210 ° C, and a discharge of 31,222 kg / s. The results of the research in this Final Project II are the characteristics of the geothermal fluid at a depth of 1500 meters from the ground and with / without using a Preheater and Recuperator the highest efficiency is 15.9% and the output power is 517.300 kW or 517300 Watt. Previously, in my final project, it was found that using the R245FA working fluid was obtained from the highest research. Then, from this research, it was found that the per-Kwh cost of this power plant used is Rp 1.203 / kWh or Rp. Rp 142 /kWh higher than the BPP South Sumatra in the Muara Enim area.