Binarycom main advantages and disadvantages
A binary cycle power plant is a type of geothermal power plant that allows cooler geothermal reservoirs to be used than is necessary for dry steam and flash steam plants. The vapor exiting the turbine is then condensed by cold air radiators or cold water and cycled back through the heat exchanger.
A binary vapor cycle is defined in thermodynamics as a power cycle that is a combination of two cycles, one in a high temperature region and the other in a lower temperature region. The use of mercury-water cycles in the United States can be dated back to the late s. A small mercury-water plant which produced about 40 megawatts MW was in use in New Hampshire in the s, with a higher thermal efficiency than most of the power plants in use during the s. Unfortunately, binary vapor cycles have a high initial cost and so they are not as economically attractive.
Water is the optimal working fluid to use in vapor cycles because it is the closest to an ideal working fluid that is currently available. The binary cycle is a process designed binarycom main advantages and disadvantages overcome the imperfections of water as a working fluid.
The cycle uses two fluids in an attempt to approach an ideal working fluid. The Rankine cycle is the ideal form of a vapor power cycle. The ideal conditions can be reached by superheating the steam in the boiler and condensing it completely in the condenser. The ideal Rankine cycle does not involve any internal irreversibilities and consists of four processes; isentropic compression in a pump, constant pressure heat addition in a boiler, isentropic expansion in a turbine, and constant pressure heat rejection in a condenser.
This process is designed to reduce the thermodynamic losses incurred in the brine heat exchangers of the basic cycle. The losses occur through the process of transferring heat across a large temperature difference between the high temperature brine and the lower temperature of the working fluid. Losses are binarycom main advantages and disadvantages by maintaining a closer match between the brine cooling curve and the working fluid heating curve.
Additional power is obtained in a second Rankine cycle by employing a portion of the hot fluid after heat exchange with the working fluid to vaporize a second working fluid having binarycom main advantages and disadvantages lower boiling point and higher vapor density than the first fluid.
From Wikipedia, the free encyclopedia. An Engineering Approach, Seventh Edition. Vapor and Combined Power Cycles.
United States, Patent No. Geothermal Power Plants, Second Edition: Geothermal energy Geothermal power Geothermal heating Geothermal gradient. Renewable energy Energy Sustainable development.
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