Thermo I Question: Two vessels coming to equilibrium. Finding final values.

Click For Summary
SUMMARY

The discussion focuses on solving a Thermodynamics I problem involving two rigid vessels containing water at different pressures and temperatures. Vessel 1 has a volume of 0.8 m³ at 650 kPa with a quality of 50%, while Vessel 2 has a volume of 0.4 m³ at 400 kPa and 250ºC. The objective is to find the final equilibrium pressure and the heat transfer when the system reaches thermal equilibrium with surroundings at 50ºC. The user is utilizing continuity equations and steam tables to derive necessary values, following a structured approach to determine mass, specific volume, internal energy, and heat transfer.

PREREQUISITES
  • Understanding of Thermodynamics principles, specifically the concepts of equilibrium and heat transfer.
  • Familiarity with steam tables for water properties at various pressures and temperatures.
  • Knowledge of continuity equations in fluid mechanics.
  • Ability to calculate specific volume and internal energy for thermodynamic systems.
NEXT STEPS
  • Study the use of steam tables for determining properties of water at different states.
  • Learn about the first law of thermodynamics and its application in heat transfer calculations.
  • Research methods for calculating equilibrium states in multi-phase systems.
  • Explore examples of heat transfer in closed systems to solidify understanding of energy changes.
USEFUL FOR

This discussion is beneficial for students in Thermodynamics courses, particularly those studying heat transfer and equilibrium processes, as well as professionals in engineering fields dealing with fluid systems and thermal analysis.

deltagal
Messages
1
Reaction score
0
Hey, guys. I am currently in a Thermo I class and have ran into a problem that has me completely stumped. I have worked in numerous different ways and anything I come up with doesn't seem to make since or be realistic. Here's the question:

Two rigid vessels are connected by a small valve and tubing. Both are of negligible size. Vessel 1 contains .8m3 of water at 650kPa at a quality of 50%. Vessel 2 contains .4m3 of water at 400kPa and 250ºC. If the valve is oped and both vessels come to equilibrium, determine the final equilibrium pressure and the amount of heat transfer when the system reaches thermal equilibrium with he surroundings which are at 50˚C.

I have currently been using the continuity equations and using steam tables to get the values that I need. My Prof said I was on the right track but wasn't very helpful at all during our session. I hope you guys can give me some hints. Thanks.
 
Physics news on Phys.org
Step 1: Determine the total mass of water in the two tanks
Step 2: Determine the initial average specific volume = (total volume of tanks)/(total mass of water)
Step 3: Determine the initial internal energy in the two tanks
Step 4: Find the final state of the system for water at 50 C and the same average specific volume as initially to get the final pressure
Step 5: Determine the final internal energy
Step 6: Determine the change in internal energy
Step 7: The heat transfer is equal to the change in specific volume
 

Similar threads

Finding Final Equilibrium and the like
  • · Replies 7 ·
Replies
7
Views
4K
Find Final Temperature of Iron & Water in Thermal Equilibrium
  • · Replies 3 ·
Replies
3
Views
4K
WaveGrid - Non-equilibrium Emergence Sandbox
  • · Replies 1 ·
Replies
1
Views
3K