Binary Cycle Power Plant

The generation of electricity from geothermal fluid for moderate to low enthalpy classification and for hot water coming out of the separator in the dominated water geothermal field, we can use binary fluid technology. The binary power plant uses the secondary working fluid which is usually an organic fluid (especially n-pentane), which has a low boiling point and high vapor pressure at low temperatures when compared to water vapor. The secondary fluid is operated using a conventional Rankine cycle in which the geothermal fluid delivers heat to the fluid in a heat exchanger to vaporize the secondary fluid. The produced steam will drive the turbine then it is cooled in a condenser until the cycle is repeated again.

Pembangkit Listrik Tenaga Panas Bumi (PLTP) Siklus Biner

Diagram of the binary cycle geothermal power plant (Source: Dickson and Fanelli, 2004).

Binary cycle power plant is usually made in the form of a small modular unit with a capacity of a few kWe up MWe. Some of these units can be combined to obtain a power plant with a capacity of up to several tens MWe. Price per unit  depends on several factors among which are the temperature of the geothermal fluid, a heat exchanger and cooling systems.
Small portable power plants, conventional or not, is important because it can help provide energy, especially for remote areas (isolated area). Standards of living can be raised because they can make use of local energy sources. They can use it for water pumping for irrigation, cooling fruits and vegetables, etc.
In addition to remote areas, the portable generator is extremely helpful for those areas that have difficulty in accessing conventional fuels, and also for the people who must pay to connect to the network/ national electricity grid.

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