Why is Carnot cycle important?
The Carnot engine — or the Carnot cycle — is important because it describes a heat engine that uses reversible processes that can be handled theoretically. Then we could use the real heat engine to power a Carnot cycle heat pump. During this isothermal expansion heat Qh flows into the gas from the hot temperature Th.
What are the stages of a Carnot cycle?
The four stages in the Carnot cycle. (A) Stage 1: Isothermal expansion under heat input Q1, (B) Stage 2: Adiabatic expansion accompanied by a fall in temperature T1 to T2, (C) Stage 3: Isothermal compression, Q2 exhausted, (D) Stage 4: Adiabatic compression accompanied by an increase in temperature T2 to T1.
What is difference between Rankine and actual Rankine Cycle?
The efficiency of the ideal Rankine cycle is close to the efficiency of the Carnot Cycle….Difference Between Ideal and Actual Rankine Cycle.
| Rankine Cycle Representation is as follows on P-v and T-s diagrams: | |
|---|---|
| Ideal Rankine Cycle | 1-2′-b-3′-4′-1 |
| Actual Rankine Cycle | 1-2-b-3-4-1 |
What is a Rankine cycle process?
The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.
What is the difference between Brayton cycle and 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.
What is the formula for efficiency of Rankine Cycle?
Thermal Efficiency of Rankine Cycle. In general the thermal efficiency, ηth, of any heat engine is defined as the ratio of the work it does, W, to the heat input at the high temperature, QH. This is very useful formula, but here we express the thermal efficiency using the first law in terms of enthalpy.
How can you increase the 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 K in 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. s T 1 2 3 4 QH QL P= Const.
Why pump is used in Rankine Cycle?
The Rankine cycle system consists of a pump, boiler, turbine, and condenser. The pump delivers liquid water to the boiler. The boiler heated by the solar heat converts water to superheated steam. This steam is used to run the turbine which powers the generator.