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In a thermal power plant, the overall efficiency can be determined using which of the following?
Rankine Cycle Efficiency
Carnot Cycle Efficiency
BoilerEfficiency├ЧGeneratorEfficiency├ЧTurbineEfficiency
Regenerative Cycle Efficiency
BoilerEfficiency├ЧGeneratorEfficiency├ЧTurbineEfficiency
The overall efficiency of a thermal power plant, often referred to as the thermal efficiency, is the product of the individual efficiencies of the major components in the energy conversion chain. It represents the ratio of the electrical energy output at the generator terminals to the heat energy supplied by the fuel in the boiler.
IS 14605:1998
The overall efficiency of a thermal power plant, often referred to as the thermal efficiency, is the product of the individual efficiencies of the major components in the energy conversion chain. It represents the ratio of the electrical energy output at the generator terminals to the heat energy supplied by the fuel in the boiler.
╬╖overallтАЛ=╬╖boilerтАЛ├Ч╬╖turbineтАЛ├Ч╬╖generatorтАЛ├Ч╬╖auxiliaryтАЛ
╬╖overallтАЛ=Heat┬аInput┬аfrom┬аFuelElectrical┬аOutputтАЛ
Energy is converted in steps: Chemical energy of fuel is converted to thermal energy in the boiler (Boiler Efficiency), thermal energy is converted to mechanical work in the turbine (Turbine Efficiency), and mechanical work is converted to electrical energy in the generator (Generator Efficiency). Multiplying these partial efficiencies accounts for the losses occurring in each stage, yielding the final net plant efficiency.
Overall efficiency reflects the cumulative effect of thermodynamic and mechanical losses.
Boiler efficiency is defined as the ratio of heat utilized in steam generation to the heat supplied by fuel.
Turbine efficiency accounts for internal losses such as friction and steam leakage.
Generator efficiency accounts for electrical and mechanical losses within the generator unit.
Provides a comprehensive view of power plant performance.
Helps identify which subsystem is the primary contributor to energy loss.
Does not account for auxiliary power consumption (power used within the plant).
Assumes steady-state operating conditions.
Performance monitoring of utility-scale coal-fired thermal power plants.
Benchmarking operational efficiency in engineering audits.
Typical coal-fired power plant efficiency ranges between 30% and 40%.
Rankine Cycle Efficiency (Option A) is a theoretical model based on the thermodynamic cycle, not the actual cumulative component efficiency.
Carnot Efficiency (Option B) provides the absolute theoretical limit based on the Second Law of Thermodynamics, which is higher than the actual efficiency of any real-world plant.
C is correct тАФ The overall efficiency of a thermal power plant is the product of the component efficiencies: boiler, turbine, and generator.
Remember that while Rankine cycle efficiency calculates the potential efficiency of the cycle, actual overall efficiency must always include the losses from the hardware components like the boiler and generator.
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