4/12/2023 0 Comments Workdone rankine cycle by ethalpy![]() The Rankine cycle (steam turbine cycle) is a more efficient variant of the Brayton Cycle and is used in most electric power generation plants. In this cycle, the air is compressed, heated by a fuel burner, then expanded through a turbine to produce work that powers the compressor. The Brayton cycle (gas turbine cycle) is the simplest thermodynamic cycle and is used in jet engines. The Rankine cycle is the thermodynamic cycle used in steam turbines. The Brayton cycle is the thermodynamic cycle used in gas turbine engines. In a Brayton cycle, the compressor and turbine are both located in the same chamber, while in a Rankine cycle they are separated by a heat exchanger.Ī Brayton cycle is typically used for power generation (such as in piston engines), while a Rankine cycle is more commonly used for heating or cooling applications. In a Brayton cycle, the working fluid is always a gas, whereas, in a Rankine cycle, the working fluid can be either liquid or vapor. The Brayton cycle is a gas turbine cycle, while the Rankine cycle is a steam turbine cycle. The difference between Brayton and Rankine cycles is that the Brayton cycle operates entirely on gases that are fed into it, while the Rankine cycle uses a liquid as one of its working fluids. In this process, heat transfer fluid (HTF) is heated by burning fuel to produce high-pressure steam and then cooled by expansion into a condenser.Ī condenser will be needed when running the Rankine Cycle in an open circuit otherwise, it would create so much pressure that the system would implode due to its own weight. The Rankine Cycle can be run in either open or closed circuits, with the former being more common for industrial applications. Rankine Cycle is a thermal power cycle that is used to generate steam and high-pressure water vapor from low-temperature water. The process can be used to turn a turbine engine or other device that uses heat energy into useful work. It is named after George Brayton, the American engineer who invented it in 1878. The Brayton Cycle is a thermodynamic cycle used to convert heat into mechanical work. This means that the energy given to the air is not too significant.Difference between Brayton and Rankine cycle? What is Brayton Cycle? Shown by the C-D line, water does not experience much increase in enthalpy. In the next process, the condensate water is pumped to the boiler to increase its pressure. The decreases of the enthalpy (G-C line) can be used to calculate the thermal energy of condensed water using the following formula: Here the heat energy not converted into kinetic energy, because the energy is used to convert the water into steam (latent heat). The steam coming out from the steam turbine enters the condenser to be condensed back into liquid phase. The reduction of the enthalpy can be used to calculate the magnitude of the motion energy produced by the steam turbine using the following formula: Wout = m (hF - hG) Heat energy from water vapor is then converted into kinetic energy, shown by the F-G line in the image above. The superheated steam produced by the boiler then goes to the steam turbine. The calorific value absorbed by water vapor can be calculated using the following formula: The heat energy from the fuel is transferred to the working fluid i.e. Thermal Efficiency of Rankine Cycle: The thermal efficiency of the Rankine cycle is the ratio between the work produced by the steam turbine that has been reduced by the pump work, with the incoming heat energy from the boiler. The phase change of the working fluid happens here from steam to water.Ĭalculation of Thermal Efficiency of Rankine Cycle: G-C Process: It is an Isobaric Compression process and happens in a Condenser.The energy stored in water vapor converts to kinetic energy in the turbine. ![]() The steam from the boiler enters the turbine and undergoes an isentropic-expansion process.
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