Why should a Rankine cycle be considered an ideal cycle for steam power plants?

Why is Rankine cycle the most used cycle in steam power production?

This low steam turbine entry temperature (compared to a gas turbine) is why the Rankine (steam) cycle is often used as a bottoming cycle to recover otherwise rejected heat in combined-cycle gas turbine power stations. Rankine engines generally operate in a closed loop where the working fluid is reused.

Why is the Rankine cycle ideal?

The Ideal Reheat Rankine Cycle

To take advantage of the increased efficiencies at higher boiler pressure without facing the excessive moisture at the final stages of the turbine, reheating is used.

Why the Rankine cycle is preferred over the Carnot cycle in steam power plants?

Carnot cycle is an ideal cycle for heat engine which gives highest efficiency between given temperature difference but it is a theoretical cycle and actually no engine works on it. Rankine cycle is an ideal cycle of vapor or steam power generation. … It gives highest efficiency between given temperature difference.

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Is a Rankine cycle ideal?

The Rankine cycle is an ideal cycle if water passes through the four components without irreversibilities and pressure drops. The ideal Rankine cycle consists of the following four processes, as shown on the T-s diagram on the left: 1-2: Isentropic compression in a pump. 2-3: Constant pressure heat addition in a boiler.

How does an ideal Rankine cycle work Mcq?

Explanation: Rankine cycle is a reversible cycle which have two constant pressure and two constant temperature processes. … Explanation: Working fluid in Rankine cycle undergoes 4 processes, expansion in turbine, heat addition in Boiler, heat rejection in Condenser and compression in pump.

What will be the Rankine cycle efficiency of a good steam power plant?

In a good steam power plant, the Rankine cycle efficiency varies from 35 to 45 %.

What is the relation of Rankine cycle in term of steam turbine?

In the Rankine cycle, steam is created in a boiler, and part of the enthalpy of the high-pressure superheated steam is converted to shaft work in a steam turbine that drives an electric generator.

What is Rankine cycle in thermal power plant?

The Rankine cycle is the fundamental operating cycle of all power plants where an operating fluid is continuously evaporated and condensed. The selection of operating fluid depends mainly on the available temperature range. Figure 1 shows the idealized Rankine cycle.

Why Rankine cycle is less efficient than the Carnot cycle?

The thermal efficiency of a Rankine cycle is lower then that of a Carnot cycle operating between the same temperature levels. This is primarily because of the fact that the energy transfer as heat in the boiler does not take place at constant temperature in the Rankine cycle.

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Why Carnot is more efficient than Rankine?

The main concept is that heat addition at constant temp has more work potential than at variable temp.. In carnot cycle all heat is added at higher temp whereas in rankine cycle it is at constt pressure ie at variable temp, so why work output of carnot cycle is more and hence more efficient.

Why is the ideal regenerative cycle not practicable?

Although it is more efficient when compared to rankine cycle, this cycle is not practicable for the following reasons. 1) Reversible heat transfer cannot be obtained in finite time. 2) Heat exchanger in the turbine is mechanically impracticable. 3) The moisture content of the steam in the turbine is high.

What is meant by Rankine cycle?

The Rankine cycle, also called the Rankine vapor cycle, is a thermodynamic cycle that converts heat into mechanical energy. The Rankine cycle is name after William Johnson Macquorn Rankine, a 19th century Scottish engineer and physicist known for his research in the thermodynamic properties of steam.

What type of process is the ideal Rankine cycle?

Explanation: Ideal Rankine Cycle is a reversible process. Explanation: For analytical purposes, always steady flow operation is considered, as in unsteady flow, the various fluid properties vary considerably which remain same when the steady flow operation is assumed.

Which of the following best describes the process of an ideal Rankine cycle?

Which of the following best describes the process of an ideal Rankine cycle? Clarification: In an ideal Rankine cycle, the working fluid is heated in boiler and converted to vapours which is used to run the turbine. … The efficiency of Rankine cycle can be improved by using a part of rejected heat in heating the liquid.

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