Admin Table of Contents
- 1 What are the assumptions made on the analysis of ideal Rankine cycle?
- 2 What is the ideal Rankine cycle?
- 3 Which of the following is not a common assumption for ideal Rankine cycles?
- 4 What are the four processes that make up the simple ideal Rankine cycle?
- 5 How does an ideal Rankine cycle work?
- 6 What type of process is the ideal Rankine cycle Mcq?
- 7 What are the assumptions for air standard cycles?
- 8 What process does Rankine cycle contain?
- 9 What are the processes in the ideal Rankine cycle?
- 10 How does the operating pressure of a boiler affect the Rankine cycle?
What are the assumptions made on the analysis of ideal Rankine cycle?
Higher work ratio 2. Specific steam consumption is more 2. Specific steam consumption is less 3. Size of the power plant for a given output is big 3.
What is the ideal Rankine cycle?
The Rankine cycle is the ideal cycle for vapor power plants; it includes the following four reversible processes: 1-2: Isentropic compression Water enters the pump as state 1 as saturated liquid and is compressed isentropically to the operating pressure of the boiler.
Which of the following is not a common assumption for ideal Rankine cycles?
Example 2
| State # | T (K) | P (kPa) |
|---|---|---|
| 3b | 523.2 | 3974 |
| 3 | 773.2 | 3974 |
| 4s | 298.2 | 3.169 |
| 4 | 298.2 | 3.169 |
Which of the following best describes the process of an ideal Rankine cycle?
Which of the following best describes the process of an ideal Rankine cycle? Clarification: In an ideal Rankine cycle, the working fluid is heated in boiler and converted to vapours which is used to run the turbine. The efficiency of Rankine cycle can be improved by using a part of rejected heat in heating the liquid.
What are the assumptions made on heat engine?
These assumptions are: (1)The working fluid is air, which continuously circulates in a closed loop and always behaves as an ideal gas. (2)All the processes are internally reversible. (3)The combustion process is replaced by a heat addition process. (4)The exhaust process is replaced by a heat rejection process.
What are the four processes that make up the simple ideal Rankine cycle?
The ideal Rankine cycle consists of the following four processes, as shown on the T-s diagram on the left: 1-2: Isentropic compression in a pump. 2-3: Constant pressure heat addition in a boiler. 3-4: Isentropic expansion in a turbine.
How does an ideal Rankine cycle work?
In an ideal Rankine cycle the pump and turbine would be isentropic, i.e., the pump and turbine would generate no entropy and hence maximize the net work output. Processes 1–2 and 3–4 would be represented by vertical lines on the T–s diagram and more closely resemble that of the Carnot cycle.
What type of process is the ideal Rankine cycle Mcq?
Explanation: Ideal Rankine Cycle is a reversible process. Explanation: For analytical purposes, always steady flow operation is considered, as in unsteady flow, the various fluid properties vary considerably which remain same when the steady flow operation is assumed.
Why is the Rankine cycle modified?
Modification of the Rankine cycle involves increasing the final feedwater temperature through use of a Reboiler and an Exergetic Heater. It eliminates cycle efficiency from dependency on turbine steam path pressure.
What are the assumptions for air standard cycle analysis?
1- The working fluid is air, which continuously circulates in a closed loop (cycle). Air is considered as ideal gas. 2- All the processes in (ideal) power cycles are internally reversible. 3- Combustion process is modeled by a heat-addition process from an external source.
What are the assumptions for air standard cycles?
State four assumptions made for air standard cycle.
- The working fluid is perfect gas.
- There is no change in mass of the working medium.
- All the process that constitutes the cycle is reversible.
- Heat is assumed to be supplied from a constant high temperature source and not from chemical reaction during the cycle.
What process does Rankine cycle contain?
Explanation: Working fluid in Rankine cycle undergoes 4 processes, expansion in turbine, heat addition in Boiler, heat rejection in Condenser and compression in pump.
What are the processes in the ideal Rankine cycle?
The ideal Rankine cycle consists of the following four processes, as shown on the T-s diagram on the left: 1 2: Isentropic compression in a pump 2 3: Constant pressure heat addition in a boiler 3 4: Isentropic expansion in a turbine 4 1: Constant pressure heat rejection in a condenser
Which is greater a Rankine cycle or an isentropic turbine?
The practical Rankine cycle is shown as 1-2’-3-4’-1. In the actual turbine, the work delivered is less than the isentropic turbine. Similarly, the work consumed by an actual pump is greater than the work consumed by an isentropic pump.
How is the vapor power cycle different from the Rankine cycle?
The actual vapor power cycle differs from the ideal Rankine cycle as a result of irreversiblities in various components. The two common source of irreversiblities are the friction and undesired heat loss to the surroundings. Fluid friction causes pressure drops in the boiler, the condenser, and the connecting pipes.
How does the operating pressure of a boiler affect the Rankine cycle?
Increasing the operating pressure of the boiler, automatically raises the temperature at which boiling takes place. This raises the average temperature at which heat is added to the steam and thus raises the thermal efficiency of the cycle.. Reheat Rankine Cycle