Adiabatic steam turbine - find the second law efficiency

In summary, the conversation is discussing how to find the actual and theoretical work output of a turbine. To find the theoretical work output, one needs to find the quality of the vapor coming out of the steam. To find the actual work output, the solution suggests that the quality of the vapor coming out of the turbine is 1, as saturated vapor has no moisture present. The question also clarifies that saturated steam and vapor are the same thing.
  • #1
theBEAST
364
0

Homework Statement


0BvU73I.png


The Attempt at a Solution


So pretty much for this question you want to find the actual work output of the turbine and the reversible work output.

To find the reversible (theoretical) work output, you know that s2 = s1, so based on that information you can find what the quality of the vapor coming out of the steam is and thus find the work output.

To find the actual work output, the solution suggests that the quality of the vapor coming out of the turbine is x = 1. This suggests that steam is coming out of the turbine. I don't understand why x = 1 for actual work output. Could someone please explain this?

Thanks
 
Physics news on Phys.org
  • #2
The quality of saturated vapor is, by definition, 1. Saturated vapor has no moisture present.
 
  • #3
SteamKing said:
The quality of saturated vapor is, by definition, 1. Saturated vapor has no moisture present.

So saturated steam and vapor mean the same thing then?
 

Related to Adiabatic steam turbine - find the second law efficiency

1. What is an adiabatic steam turbine?

An adiabatic steam turbine is a type of turbine that operates without any heat transfer with its surroundings, meaning that there is no heat lost or gained during the process. This type of turbine is commonly used in power plants to convert the energy of steam into mechanical energy which can then be used to generate electricity.

2. How does an adiabatic steam turbine work?

An adiabatic steam turbine works by using the pressure and velocity of steam to rotate a series of blades attached to a shaft. The steam is directed onto the blades, causing them to spin and convert the energy of the steam into rotational energy. The rotational energy is then used to power a generator and produce electricity.

3. What is the second law efficiency of an adiabatic steam turbine?

The second law efficiency of an adiabatic steam turbine is a measure of how effectively the turbine converts the energy of steam into mechanical energy. It takes into account the irreversibilities and losses that occur during the process. A higher second law efficiency indicates a more efficient turbine.

4. How is the second law efficiency of an adiabatic steam turbine calculated?

The second law efficiency of an adiabatic steam turbine is calculated by dividing the actual work output of the turbine by the maximum possible work output based on the difference in enthalpy between the inlet and outlet steam. This calculation takes into account the effects of irreversibilities, and the result is expressed as a percentage.

5. What factors can affect the second law efficiency of an adiabatic steam turbine?

The second law efficiency of an adiabatic steam turbine can be affected by various factors such as the design and condition of the turbine, the type and quality of the steam used, and the operating conditions. Other factors that can impact efficiency include the type and condition of the blades, the presence of deposits or fouling, and the maintenance and upkeep of the turbine.

Similar threads

Are theses approaches correct? (entropy change of water turning into steam)
    • Introductory Physics Homework Help
Replies
9
Views
3K
Thermodynamics rankine cycle problem
    • Introductory Physics Homework Help
Replies
2
Views
1K
Internal energy of a container filled with water & steam
    • Introductory Physics Homework Help
Replies
12
Views
1K
Cost efficient steam catching setup for a water source
    • Mechanical Engineering
Replies
9
Views
683
What are the thermodynamic properties and efficiency of a steam plant?
    • Introductory Physics Homework Help
Replies
9
Views
2K
Calculating Revenue for a Geothermal Power Plant with 150kW Steam Flow at 180°C
    • Introductory Physics Homework Help
Replies
5
Views
1K
Finding efficiency of an engine (with attempt)
    • Introductory Physics Homework Help
Replies
5
Views
1K
Engineering How Does Efficiency Impact Calculations in a Regenerative Rankine Cycle?
    • Engineering and Comp Sci Homework Help
Replies
1
Views
598
Steam Turbine Efficiency and Steam Bleeding
    • Engineering and Comp Sci Homework Help
Replies
1
Views
1K
Pressure change at the inlet of a steam turbine in a small electric power plant
    • Advanced Physics Homework Help
Replies
4
Views
3K

Hot Threads

Recent Insights

Back
Top