Thermodynamics - Find final pressure

Click For Summary
SUMMARY

The discussion focuses on calculating the final pressure of steam undergoing a constant volume process, starting from an initial pressure of 0.1 MPa and temperature of 350°C, with a final temperature of 300°C. The correct approach involves using steam tables rather than linear interpolation, as indicated by user Chet. The final pressure should be determined by identifying the specific volume at the initial state and finding corresponding pressures at the final temperature from the steam tables. The correct final pressure is stated to be 93.4 kPa.

PREREQUISITES
  • Understanding of steam tables and their application in thermodynamics
  • Knowledge of specific volume and its significance in constant volume processes
  • Familiarity with the concepts of pressure and temperature in thermodynamic systems
  • Basic skills in linear interpolation for estimating values
NEXT STEPS
  • Study the use of steam tables for various thermodynamic calculations
  • Learn about specific volume and its role in constant volume processes
  • Explore the principles of linear interpolation in thermodynamics
  • Investigate the relationship between pressure, temperature, and specific volume in steam systems
USEFUL FOR

Students and professionals in thermodynamics, particularly those working with steam systems, engineers involved in thermal system design, and anyone needing to perform calculations related to steam properties and behavior.

Ribz
Messages
2
Reaction score
0

Homework Statement



An amount of steam undergoes a constant volume process from an initial state for which the pressure and temperature are 0.1MPa and 350°C respectively. The final temperature is 300°C. Using linear interpolation estimate the final pressure.

Homework Equations



Use Thermodynamics and Transport Properties of Fluids

The Attempt at a Solution



I used linear interpolation for the pressure at 100°C, which was 1.01325 bar. Got my answer which was 28.3 kPa. The answer stated is 93.4 kPa
 
Physics news on Phys.org
Ribz said:

Homework Statement



An amount of steam undergoes a constant volume process from an initial state for which the pressure and temperature are 0.1MPa and 350°C respectively. The final temperature is 300°C. Using linear interpolation estimate the final pressure.

Homework Equations



Use Thermodynamics and Transport Properties of Fluids

The Attempt at a Solution



I used linear interpolation for the pressure at 100°C, which was 1.01325 bar. Got my answer which was 28.3 kPa. The answer stated is 93.4 kPa
Hi Ribz. Welcome to Physics Forums!

Let me guess. You are supposed to be using steam tables to solve this, correct?

What is being held constant in this system:
(a) specific enthalpy?
(b) specific volume?
(c) specific internal energy?
(d) specific entropy?

Chet
 
Specific volume is constant
 
Ribz said:
Specific volume is constant
Good. So, from your steam tables, what is the specific volume of the steam initially? Now look in your steam tables for 300C, and find a condition as close as you can get to this specific volume. What is the specific volume at that point, and at the two adjacent pressures in the table? What are the pressures and volumes that go with the three points in your table?

Chet
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
6K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 8 ·
Replies
8
Views
5K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 10 ·
Replies
10
Views
2K
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
7K
  • · Replies 4 ·
Replies
4
Views
4K