STUDY WASTE BRINE USED OUTPUT SEPARATOR PLTP DIENG

• Main Author: Roni Hajianto, Muhamad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46553
• Institution: Institut Teknologi Bandung

This research discusses the opportunity to utilize the waste brine of Dieng PLTP separator output as a new geothermal power plant using binary cycles. The initial stage of this research is to do modeling with the help of Engineering Equation Solver (EES) software. Thermodynamic analysis was performed with variations in 3 types of working fluids namely Isobutane, N-Butane and R236fa. The N-butane working fluid produces the greatest power at 532.8 kW and thermal efficiency of 14.07%. The isobutane working fluid produces a net power of 514.1 kW and a thermal efficiency of 13.56%. The working fluid R236fa produces a net power of 486 kW and a thermal efficiency of 12.82%. Economic analysis is carried out in this binary cycle to obtain the price of electric energy production or Levelized Electricity Generating Cost (LEGC), then determine the break-even point (BEP) and the cost of the construction. The Nbutane working fluid produces the lowest price of Rp1,301.00/kWh with a BEP of 10.2 years and the investment of construction is 5920 USD/kWh. Furthermore, theIsobutane working fluid has a price of Rp1,329.00/kWh with a BEP of 10.44 years and the cost of contruction equal to 6062 USD / kWh. Finally, the working fluid R236fa has a price of Rp1,387.00 / kWh with a BEP of 10.93 years and the cost 6347 USD / kWh of investment. The last consideration is the environmental it impact out the CO2 reduction andsafety of working fluids. The N-butane working fluid could reduce CO2 emission by 3039 tons / year, Isobutane by 3,007 tons / year and R236fa by 2,869 tons / year. N-butane working fluid is A3 safety group, 0 ODP dan 0 GWP.