Thermodynamics piston stetch question

In summary, the conversation discussed the use of specific volume and dryness fraction equations to calculate pressure in a thermodynamics problem. The specific volume and dryness fraction were given as 0.0502 m^3/kg and 0.5244, respectively, and the specific internal energy was given as 1800 KJ/kg. However, the given information was not sufficient to calculate the pressure, so the person asked for help with the remaining parts of the question. Specifically, they asked for the temperature that would result in only saturated vapor at the final specific volume.
  • #1
hins2014
1
0

Homework Statement



12821987_10205499477355598_1211638600_n.jpg


Homework Equations



specific volume = volume / mass
dryness fraction = mass of vapor / total mass
pressure

The Attempt at a Solution


part(a) is totally not relevant to part(b) and I finished part (b)i
dryness fraction = 0.5244
specific volume = 0.0502 m^3/kg
specific internal energy = 1800 KJ/kg

Then, I want to use the relationship between the volume of original and final state to final out the pressure. However, I can't use the above information to calculate the answer.
Therefore, I want to ask about the question about (b)ii - v.
Thanks.
 
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  • #2
What temperature would be consistent with only having saturated vapor at the final specific volume?
 

Related to Thermodynamics piston stetch question

1. What is a thermodynamics piston stretch question?

A thermodynamics piston stretch question is a type of problem commonly used in thermodynamics to test understanding of the relationship between pressure, volume, and temperature in a system with a fixed amount of gas and a movable piston.

2. How do you solve a thermodynamics piston stretch question?

To solve a thermodynamics piston stretch question, you need to use the ideal gas law (PV=nRT) and the concept of work done by a gas to determine the relationship between the initial and final states of the system. From there, you can use algebraic equations to solve for the unknown variables.

3. What are the key concepts involved in a thermodynamics piston stretch question?

The key concepts involved in a thermodynamics piston stretch question include the ideal gas law, work done by a gas, and the relationship between pressure, volume, and temperature in a closed system. It also requires an understanding of the properties of gases, such as temperature and pressure, and how they affect the behavior of a system.

4. What are some common mistakes people make when solving a thermodynamics piston stretch question?

One common mistake people make when solving a thermodynamics piston stretch question is not properly converting units. It is important to ensure all values are in the same units before calculating, such as converting from Celsius to Kelvin for temperature. Another mistake is not considering the sign convention for work done by a gas, as it can be positive or negative depending on the direction of movement of the piston.

5. How are thermodynamics piston stretch questions used in real-world applications?

Thermodynamics piston stretch questions are used in various real-world applications, such as in the design and operation of engines, refrigeration systems, and power plants. They are also used in the study of atmospheric conditions and weather patterns, and in the development of new materials and technologies. Understanding the principles of thermodynamics is crucial in many industries, including engineering, chemistry, and physics.

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