Solved Example for First Law of Thermodynamics for a Closed System #2

Question 1 was solved in a previous blog entry (Click here).

Note: The Appendix B for steam values that I have referred to in these questions was obtained from: 

M.D Koretsky, Engineering and Chemical Thermodynamics, Wiley, 2004.

However, any steam tables from other reputable publishers can also work.

Question 2

An insulated rigid tank contains 0.2 kg of wet steam at 65°C. The steam is stirred with a paddle wheel until the pressure reaches 500 kPa. If the volume of the tank is 0.15 m3, determine:

a) The final temperature in the tank,

b) The work done by the paddle wheel.

Answer: 

Question 3

A rigid tank containing saturated steam at 600 kPa is cooled until the quality reaches to 50%. If the volume of the tank is 0.3 m³, determine:

a) The final temperature and pressure in the tank,

b) The amount of heat that must be removed.

Answer: