The thermal efficiency of the Brayton cycle increases as a result of regeneration
since less fuel is used for the same work output.
How do you increase the thermal efficiency of Brayton cycle?
In general,
increasing the pressure ratio
is the most direct way to increase the overall thermal efficiency of a Brayton cycle because the cycle approaches the Carnot cycle. According to Carnot’s principle, higher efficiencies can be attained by increasing the temperature of the gas.
How does regeneration improve the thermal efficiency of gas turbine cycle?
It was found that
adding regeneration to the simple gas turbine cycle results in an increase in the thermal efficiency of cycle
. It was also found that including regeneration in gas turbine cycle results in an increase in the output power of the cycle, and it results in a decrease in the exhaust gas temperature.
What is the effect of regeneration in work output of Brayton cycle?
What is the effect of regeneration in brayton cycle work output? Explanation: Regeneration in the brayton cycle
increases efficiency by recovery of waste heat
. It doesn’t change the net work output.
How does regeneration increase efficiency?
Regeneration improves the cycle efficiency by
increasing the initial feed water temperature before the water
, water enters the boiler and also helps in controlling the large the large flow rate of steam at the turbine exhaust.
When Brayton cycle efficiency is decreases with regeneration?
A most important point to notice is that contrary to a simple Brayton cycle, the thermal efficiency of a Brayton cycle with regeneration decreases with the
increase in pressure ratio
. Therefore, not all the combinations of pressure and temperature ratios induce an increase in thermal efficiency.
What is the thermal efficiency of Brayton cycle?
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.
Why is Brayton cycle more efficient than Rankine?
The Brayton cycle is more efficient than the Rankine cycle, but the Rankine cycle can generate more power
because it uses water as its working fluid
. The Brayton cycle is a thermodynamic cycle in which a gas or vapor is compressed, heated, and then expanded.
What are the factors influencing the ideal Brayton cycle efficiency?
Key factors affecting the Brayton cycle efficiency includes the
turbine inlet temperature, compressor and turbine adiabatic efficiencies, recuperator effectiveness and cycle fractional pressure loss
.
What is regenerative cycle efficiency?
Regeneration in thermodynamics process refers to a method where the certain quantity of heat abstracted from the steam is utilized to heat the water. The regeneration process occurs between the stages of turbine and pump respectively.
Using regeneration, the efficiencies of thermodynamic cycles can be improved
.
What is the purpose of regeneration in gas turbine?
The regeneration cycle of a gas turbine uses recovered exhaust heat
to preheat the compressed air prior to combustion
. This heat recovery can increase the turbine’s thermal efficiency to approximately 35 to 40%.
How it improves the thermal efficiency of a simple open cycle gas turbine plant?
The back work ratio of a gas-turbine improves as a result of
intercooling and reheating
. However; intercooling and reheating decreases thermal efficiency unless they are accompanied with regeneration. This procedure also maximizes the turbine work output.
What is the thermal efficiency of Rankine cycle?
In modern nuclear power plants, which operate the Rankine cycle, the overall thermal efficiency is
about one-third (33%)
, so 3000 MWth of thermal power from the fission reaction is needed to generate 1000 MWe of electrical power.
How can we increase the efficiency of the 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.
Which is more efficient reheat cycle or the regenerative cycle?
Analysis shows that
regenerative cycle
is more efficient compare to reheat cycle for a given set of operating conditions.
What kind of advantages are there when a regenerator is used in a refrigeration system?
Advantages of regenerators
The advantages of a regenerator over a recuperating (counter-flowing) heat exchanger is that
it has a much higher surface area for a given volume, which provides a reduced exchanger volume for a given energy density, effectiveness and pressure drop
.
How is Brayton cycle efficiency calculated?
Which of the following cycle has maximum efficiency?
Explanation : Only
Carnot cycle
is the one which the processes involved are reversible.
What is isentropic efficiency?
The isentropic efficiency is
the ratio of actual power to the isentropic power
, which is the power produced by the same turbine if it had an isentropic efficiency of 100%.
Is Brayton cycle or Rankine cycle more efficient?
The Brayton cycle, by design, gives higher thermal efficiencies than the Rankine cycle
, and modifications to the Brayton cycle produce a much larger increase in thermal efficiency than for the Rankine cycle; the addition of one extra component in each (reheat in the Rankine cycle, R2 in Table 2, and regeneration in the …
Which is more efficient Brayton or Otto?
The
Brayton cycle is the ideal cycle for a gas-turbine engine and has the same efficiency as that of the Otto cycle
(Granet, p. 373).
How does Brayton cycle differ from Rankine cycle?
The key difference between Rankine cycle and Brayton cycle is that
the Rankine cycle is a vapour cycle, whereas the Brayton cycle is a cycle between liquid and vapour phases
. Both the Rankine cycle and Brayton cycle are thermodynamic cycles.
