Abstract
The Lahendong Geothermal Area produces geothermal fluids with brine water with temperatures between 170oC to 140oC. Brine water heats the alternative working fluid (liquid R-134a) in the evaporator to be converted into pressurized steam which then drives an alternative turbine (turbocharge) connected to a power generator. The research was conducted by: studying literature / collecting related references, manufacturing process of model scale ORC systems (assembling ORC components), and conducting commissioning of water heater designs (brine water simulation) and turbines modified from Turbochager, with locations research in the workshop / laboratory of the Department of Mechanical Engineering, Manado State Polytechnic. The results of the operation test are as follows: Dimensions of the water heater box: (48.5 x 31 x 27.5) cm (L x W x H) with 4 heaters with a heating time of 36 minutes reaching 98.1 oC. The performance of the modified turbine with a pressure of 7 (bar) on the 4th data collection where the resulting torque = 0.15 (Nm) rotation n = 46000 (rpm) occurs Maximum power = 723 (Watt), indicating that the turbine can be used.
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