4. Which of the following statements about regenerators is true? explain: Increase the average temperature of heating by using a heat accumulator. Explanation: This is because after using the heat accumulator, the average temperature of heating increases and the average temperature of exhaust heat decreases.

How can refrigeration be used to improve the efficiency of the Brayton cycle?

The efficiency of a Brayton engine can be improved by: increase pressure ratio, as shown in Figure 1 above, increasing the pressure ratio increases the efficiency of the Brayton cycle. … First, increasing the pressure ratio increases the compressor discharge temperature.

Which of the following is true for an ideal Brayton cycle?

Which of the following is true about Brayton cycles? Explanation: These processes take place in Brayton cycles.Explanation: This is an expression for the efficiency of Brayton cycles and rk= compression ratio. Explanation: The reason is that the compression ratio can be expressed as a pressure ratio.

How does regeneration affect Brayton cycle efficiency?

The most important point to note is that, in contrast to a simple Brayton cycle, the thermal efficiency of the Brayton cycle is the same as Regeneration decreases with increasing pressure ratio. Therefore, not all combinations of pressure and temperature ratios will result in increased thermal efficiency.

Which of the following is true in a gas turbine with regeneration?

During regeneration, there are Reduce the heat of the supplied gas But there is no effect on the work of the turbine and compressor. Therefore, in the regeneration process, the regeneration does not increase the power ratio of the steam turbine, but increases the efficiency of the steam turbine.

Which of the following is true?

16 related questions found

Which cycle does a gas turbine use?

A thermodynamic cycle.The basic thermodynamic cycle used in a gas turbine is Brayton cycle. This cycle, shown in the pressure-temperature diagram in Figure 1, was first described by Joule in 1851 and patented by Brayton in 1867.

Which gas turbine cycle is used in an airplane?

Turbine engine Thermodynamic Cycle – Brayton Cycle. In order to move the plane through the air, we have to use some kind of propulsion system to generate thrust. The most widely used form of propulsion system in modern aircraft is the gas turbine engine.

What is the basic principle of regeneration?

What is the basic principle of regeneration?Explanation: in The regenerated steam from the condenser is circulated through the turbine to increase the steam temperature before entering the boiler. Description: Feed water is preheated to reduce fuel consumption and improve efficiency.

Why use a regenerator in a Brayton cycle?

The effectiveness of the regenerator is The ratio between the actual heat transfer from the exhaust to the compressed air and the ideal heat transfer from the exhaust to the compressed air. A system with higher regeneration efficiency naturally has higher efficiency.

Are Brayton cycles reversible?

The ideal Brayton cycle is given by Four Internally Reversible Processes. Pv and Ts diagrams for an ideal Brayton cycle are shown on the left. In an ideal Brayton cycle, heat is added to the cycle in a constant pressure process (process 2-3). Heat is removed in a constant pressure process (process 4-1).

Where is the Brayton cycle used?

Brayton cycle is a thermodynamic cycle in some heat engines. Notably, it is used in gas turbine engines and some jet engines. The cycle involves compressing ambient air, mixing the air with fuel, then igniting the mixture, which expands, doing work.

What is the efficiency of the Rankine cycle?

In a modern nuclear power plant operating the Rankine cycle, the total thermal efficiency is About a third (33%)thus requiring 3000 MWth of thermal energy from the fission reaction to generate 1000 MWe of electricity.

What is the pressure ratio of a gas turbine?

In aeronautics, the total pressure ratio or total compression ratio is Stagnation pressure ratio measured before and after the compressor of a gas turbine engine. The terms compression ratio and pressure ratio are used interchangeably.

What are the ways to improve the efficiency of the Rankine cycle?

There are three ways to improve the efficiency of a simple ideal Rankine cycle.

• Reduce condenser pressure. The effect of reducing condenser pressure on the efficiency of the Rankine cycle is illustrated on the Ts plot on the left. …
• Superheat steam to high temperature. …
• Increase boiler pressure.

What is the efficiency of the Brayton cycle?

Ideal Brayton cycle efficiency.High pressure ratio for peak cycle efficiency in practical gas turbines to minimize heat rejection temperature (T4) and increase the average temperature of heat supplement (T2+T3)/2. Exergy remaining in the exhaust is lost in the cycle.

Is it for refrigeration cycle?

Explanation: Gas liquefaction is the physical transformation of a gas into a liquid state (condensation). The liquefaction of gases is a complex process that uses various compressions and expansions to achieve high pressures and extremely low temperatures.air refrigeration cycle for gas liquefaction process.

What is the role of the regenerator?

The regenerator can be used for Exhaust heat exchange or for intercooling in gas turbine systems. As an exhaust gas heat exchanger, the regenerator recovers heat from the exhaust gas and uses it to preheat the compressed air before it enters the combustion chamber.

Which cycle is more efficient for power plants?

Brayton (Gas Turbine) CycleThe IFCC, which produces half the electricity, is inherently more efficient than the Rankine (steam) cycle because no heat of vaporization of water is lost in the Brayton cycle to make steam.

What is CP in Brayton cycle?

Figure 2: Ts and Pv diagrams of an ideal Brayton cycle.where rP is called the pressure ratio and k = cp /cv is specific heat ratio. Given that the maximum and minimum temperatures can be specified for the Brayton cycle, changes in the pressure ratio result in changes in the work output of the cycle.

What is the role of the regenerator Sanfoundry?

What is the role of the regenerator? Note: The regenerator is usually a shell and tube structure.Regenerator use The heat of the exhaust gas heats the compressed air before It is sent to the combustion chamber. This reduces fuel consumption and improves cycle thermal efficiency.

What is the process of regeneration and why is it important?

Regeneration is a natural process Allows plants and animals to replace or restore damaged or missing cells, tissues, organs, or even entire body parts to function fully. Scientists are investigating the potential use of regenerative technologies in medicine, such as the treatment of various injuries and diseases.

What is the standard air cycle of a gas turbine called?

What is the standard air cycle of a gas turbine called? explain: Brayton cycle It is the ideal air standard cycle for gas turbines, and like the Rankine cycle, it also includes two reversible adiabatic and two reversible isobars.

Which cycle does the plane use?

gas refrigeration cycle Used in aircraft refrigeration systems, this cycle is also known as the air refrigeration cycle.

What are the 3 main components of a gas turbine?

A gas turbine consists of three main components: Compressors, Combustors and Power Turbines. In the compressor section, air is drawn in and compressed to 30 times the ambient pressure and directed to the burner section where fuel is introduced, ignited and burned.

What is the principle of a gas turbine?

The working principle of a gas turbine is Brayton cycle, where compressed air is mixed with fuel and combusted under constant pressure conditions. The resulting hot gas is expanded through a turbine to do work.