Although more heat input is required for reheating, the efficiency of a reheating cycle is higher because
the two-stage turbine develops relatively more work
.
What is the main advantage of reheating in a Rankine cycle?
The main advantage of the reheat cycle is that it
increases the dryness fractions of steam at condenser inlet
thus making it possible to use higher boiler pressure.
How can you increase efficiency of a 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.
What is the efficiency of reheat cycle?
Cycle Efficiency with Reheat. We will occasionally encounter reheated cycles whose efficiency is not as high as that of the original Rankine cycle operated between the same high and low pressure limits. (For the case presented in our reheat example they are both nearly identical at
40%
.)
How does reheat efficiency affect cycle efficiency?
Although more heat input is required for reheating,
the efficiency of a reheating cycle is higher because the two-stage turbine develops relatively more work
.
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 is the purpose of reheat cycle?
The purpose of a reheating cycle is
to remove the moisture carried by the steam at the final stages of the expansion process
. In this variation, two turbines work in series.
How effective is reheating and regenerating in improving working characteristics of the system?
A comparison study between the regular reheat regenerative cycle and the invented cycle is done. The results indicate that a gain in efficiency of
up to 2.5%
is obtained when applying invented cycle at the same conditions of pressure, temperatures, number of reheating stages, and feed water heaters.
How do you Reheat Rankine cycle?
What is the 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 does regeneration improve efficiency?
The thermal efficiency is improved because
the average temperature of heat added to the cycle is increased
. The heat rate is reduced. The blade height is less due to the reduced amount of steam passes through the low-pressure stages.
What is the effect of reheat?
Explanation: Reheat
increases work output
.
Is there an optimal pressure for reheating the steam of a Rankine cycle?
For a reheat Rankine cycle, the optimum reheat pressure is
0.20-0.25 of the initial steam pressure
(boiler pressure).
What is the effect of superheated steam on efficiency of Rankine cycle?
Explanation: The effect of superheated steam on efficiency of Rankine cycle is that
the efficiency of Rankine cycle increases with increase in superheat of the steam
.
