What is Brayton cycle and thermal efficiency?

The Brayton cycle thermal efficiency contains the ratio of the compressor exit temperature to atmospheric temperature, so that the ratio is not based on the highest temperature in the cycle, as the Carnot efficiency is.

How can you increase the efficiency of the Brayton cycle?

The efficiency of a Brayton engine can be improved by: 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.

What is CP in Brayton cycle?

2: T-s and P-v diagrams for ideal Brayton cycle. where rP is called the pressure ration and k = cp /cv is the specific heat ratio. Given that the maximum and minimum temperature can be prescribed for the Brayton cycle, a change in the pressure ratio can result in a change in the work output from the cycle.

What are the methods to improve the efficiency of Rankine Cycle?

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

• Decreasing the condenser pressure. The effect of lowering the condenser pressure on the Rankine cycle efficiency is illustrated on a T-s diagram on the left.
• Superheating the steam to a high temperature.
• Increasing the boiler pressure.

What is regenerator efficiency?

The effectiveness of a regenerator is the ratio between actual heat transfer from the exhaust to the compressed air and ideal heat transfer from the exhaust to the compressed air. Therefore, in real applications, regenerator efficiency is below 0.85 [13].

What is the efficiency of dual cycle?

For dual cycle, efficiency depends not only on compression ratio but also on how much heat is added at constant volume and constant pressure. For same amount of heat added, efficiency will increase if its share in constant volume heat addition is increased and vice versa.

Which cycle has highest efficiency?

the Carnot cycle
Any engine that uses the Carnot cycle enjoys the maximum theoretical efficiency. While Carnot engines are ideal engines, in reality, no engine achieves Carnot’s theoretical maximum efficiency, since dissipative processes, such as friction, play a role.