Brayton Cycle Vs Rankine Cycle

October 11, 2024 Post a Comment

Brayton cycle vs rankine cycle

Both cycles are used to generate mechanical energy out of thermal energy. The major difference between these cycles is the working fluid used. Rankine cycle uses liquid (mostly water) as working fluid whereas Brayton cycle uses gas (mostly air) as working fluid.

Is Brayton cycle more efficient than Rankine?

A Brayton cycle for a gas turbine is a more efficient heat engine than the Rankine cycle used in a boiler.

Why is the Brayton cycle more efficient?

Increasing pressure ratio, as Figure 1 above shows, increasing the pressure ratio increases the efficiency of the Brayton cycle. This is analogous to the increase of efficiency seen in the Otto cycle when the compression ratio is increased. However, practical limits occur when it comes to increasing the pressure ratio.

What is the difference between the Brayton cycle and the Rankine cycle Mcq?

Explanation: The difference between a Rankine cycle & a Brayton cycle is that the working fluid in a Brayton cycle doesn't undergo phase change while it does in Rankine cycle.

Why Brayton cycle is used in gas turbine?

The Brayton Cycle is a thermodynamic cycle that describes how gas turbines operate. The idea behind the Brayton Cycle is to extract energy from flowing air and fuel to generate usuable work which can be used to power many vehicles by giving them thrust.

What is the Rankine cycle used for?

The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.

Why is Brayton pressure constant?

Air mixed with the fuel in the combustion chamber and the mixture is burned at constant pressure. The high pressure, high temperature gases exit from the combustion chamber and expand in the turbine to generate enough power to drive the compressor and the auxiliary equipment.

How does Brayton cycle work?

According to the principle of the Brayton cycle, air is compressed in the turbine compressor. The air is then mixed with fuel, and burned under constant pressure conditions in the combustor. The resulting hot gas is allowed to expand through a turbine engine to perform work.

Which cycle is used in jet engine?

The operation of a jet engine is represented by the Brayton cycle, a thermodynamic cycle that underlies all gas turbine engines.

Is Brayton cycle reversible?

The reverse Brayton cycle is the reverse process of the Brayton cycle. A Brayton cycle that goes in the reverse direction is known as the reverse Brayton cycle. To move the heat from the colder to the hotter body and not the production of work, is used by this process.

Is Brayton cycle an open cycle?

The open Brayton cycle means that the gases are discharged directly into the atmosphere. In a closed Brayton cycle, the working medium (e.g.,, helium) recirculates in the loop, and the gas expelled from the turbine is reintroduced into the compressor.

How efficient is the Brayton cycle?

Compressor and turbine isentropic efficiencies are 0.85. The compression process occurs in two stages, each having a pressure ratio of 2.0 with intercooling to 300 K in between. A 75% effective regenerator reduces fuel costs.

What is difference between Rankine and actual Rankine cycle?

Rankine Cycle Representation is as follows on P-v and T-s diagrams:
Ideal Rankine Cycle	1-2^'-b-3^'-4^'-1
Actual Rankine Cycle	1-2-b-3-4-1

What is the difference between Carnot and Rankine cycle?

Carnot cycle is a theoretical cycle whereas the Rankine cycle is a practical one. Carnot cycle ensures the maximum efficiency under ideal conditions, but the Rankine cycle ensures the operation in real conditions. The efficiency obtained by the Rankine cycle is always lower than that of the Carnot cycle.

How can we increase the efficiency of Rankine cycle?

Increasing the Efficiency of Rankine Cycle That is, to increase the efficiency one should increase the average temperature at which heat is transferred to the working fluid in the boiler, and/or decrease the average temperature at which heat is rejected from the working fluid in the condenser.

Is Rankine cycle reversible?

Although the ideal Rankine cycle is internally reversible, there are still external irreversibilities because of the temperature change in the heat addition process. The actual Rankine cycles deviate somewhat from the ideal ones. In actual Rankine cycles, the turbines and pumps are not isentropic.

What is regeneration in Brayton cycle?

Regeneration is one of the methods for the heat recovery. It utilizes the turbine exhaust as a preheater for the compressed air. The cycle layout and T-s diagram of the regenerative Brayton cycle is presented in Figs.

What is back work ratio in Brayton cycle?

The ratio of the compressor work to the turbine work is called the back-work ratio. Sometimes, more than one-half of the turbine work may be used by the compressor.

What is the other name of Rankine cycle?

The Rankine cycle, also called the Rankine vapor cycle, is a thermodynamic cycle that converts heat into mechanical energy.

Who uses Rankine?

Rankine is commonly used in the aerospace industry in the United States. Rankine is to Fahrenheit what Kelvin is for Celsius. So when people in the United States were creating programs and using equations that needed an absolute temperature, they used Rankine before Celsius became dominate for scientific calculations.