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.
How can the efficiency of Rankine cycle be improved Mcq?
The thermal efficiency of the Rankine cycle can be increased by the
use of regenerative heat exchange
.
What is Rankine cycle efficiency?
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.
What are the various factors affecting Rankine cycle efficiency?
There are many factors affecting the Organic Rankine Cycle’s (ORC) performance, such as working fluid selection, evaporator and condenser temperatures, pinch point temperature differences (the minimum temperature difference between refrigerant and the waste heat source (PPTD
evap
) or cooling water (PPTD
con
)), …
Which of the following improves efficiency of Rankine cycle in a thermal power plant?
Thermal efficiency of Rankine cycle can be improved by
increasing the mean temperature of heat addition
, by using of high pressure steam. The mean temperature of heat addition can be increased by using super heat, reheat and regeneration.
Which one of the following modifications to a Rankine cycle would upgrade enhance its efficiency so as to approach that of Carnot cycle?
Explanation:
Area under P-V curve
for Rankine will be more as compared to Carnot cycle. Explanation: In winters, the temperature of cooling water is low, which increases Condenser’s efficiency.
Which of the following station is least efficiency?
Steam engine
has the least thermal efficiency as some of the heat is lost in warming the vessel.
Why is the efficiency of Rankine cycle less than that of Carnot cycle?
The thermal efficiency of a Rankine cycle is lower then that of a Carnot cycle operating between the same temperature levels. This is primarily because of the fact that
the energy transfer as heat in the boiler does not take place at constant temperature in the Rankine cycle
.
How efficient are organic Rankine cycles?
Efficiency. The efficiency of current high temperature Organic Rankine Cycles
does not exceed 24%
.
How can you reduce the irreversibility of the Rankine cycle?
There are several methods used to improve the overall efficiencies of the Rankine cycle, namely: (i)
lowering the condenser pressure
, (ii) achieving high-temperature superheated steam, (iii) increasing the boiler pressure.
How can you increase the efficiency of a steam power plant?
- Step 1: Do a Steam Trap Survey. First, a steam trap survey can easily identify leaking or faulty traps and provide significant potential savings. …
- Step 2: Understand the Value of Condensate. …
- Step 3: Insulate your Steam System. …
- Step 4: Look for Steam Leaks. …
- Step 5: Start Steam Metering.
How could you improve the thermal efficiency of the laboratory Rankine cycle demonstration unit without any additional components or modification?
Alternative way of increasing the Rankine cycle efficiency is by
increasing the boiler operating pressure
and thus in a way related with the temperature at which boiling is taking place in the boiler. Thus the thermal efficiency of the cycle increases.
What is regeneration in Rankine cycle?
Regeneration: Regeneration, a process during which heat is transferred to a thermal energy storage device (called a regenerator) during one part of the cycle and is transferred back to the working fluid during another part of the cycle.
What is the efficiency of the ideal Rankine cycle which operates the boiler at 3 MPa with an outlet temperature of 350 C and the condenser at 50 kPa?
A simple Rankine cycle operates its boiler at 3 MPa with an outlet temperature of 350°C and its condenser at 50 kPa. The turbine has an isentropic efficiency of
0.9
while all other operating conditions and process are ideal.
Where is India’s first nuclear center?
New Delhi: Monday marks the 50th anniversary of the Tarapur Atomic Power Station or TAPS as it is known.
Located in the industrial area of Boisar in Maharashtra’s Thane district
, TAPS was India’s first atomic power project when it began operations on 28 October, 1969.
Which component of gas turbine power plant is main cause of its low efficiency?
3. Which component of gas turbine power plant is main cause of its low efficiency? Explanation: The overall efficiency of gas turbine is low, because a greater part of power developed by the turbine ( about 65%) is used in driving
the compressor
.
Which of the following has the lowest efficiency Mcq?
6. Which of the following has the lowest efficiency? Explanation:
OTEC power generation
gives less efficiency.
Can the Rankine cycle be more efficient than the Carnot cycle?
The Rankine cycle is
less efficient than the Carnot cycle for given maximum and minimum temperatures
, but, as said earlier, it is more effective as a practical power production device.
Why Carnot is more efficient than Rankine?
The main concept is that
heat addition at constant temp has more work potential than at variable temp
.. In carnot cycle all heat is added at higher temp whereas in rankine cycle it is at constt pressure ie at variable temp, so why work output of carnot cycle is more and hence more efficient.
How can the second law efficiency of a simple ideal Rankine cycle be improved?
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.
