# Tank problem

1. Sep 2, 2015

### JasonHathaway

1. The problem statement, all variables and given/known data

A tank has a saturated liquid at 0.2 MPa. An amount of heat is transferred until the pressure in the tank became 0.1 MPa. If the volume of the tank 1 m3. Determine:

1- The final state of the water

2- The mass of the vapor in the tank

3- The work

4- The process on P-v diagram

2. Relevant equations
V=C (Volume is constatnt)
m (mass) = Volume (V) / Specific volume (v)

3. The attempt at a solution

v1=vf |P=0.2 MPa = 0.8857 m3/kg

v1= v2=0.8857 m3/kg

At P1=0.1 MPa, v2=0.8857 m3/kg: vf < v2 < vg

The water is mixture of saturated liquid and saturated vapor --> The final state of the water

m=V/v = (1/0.8857) = 1.13 kg --> The mass of the vapor in the tank

Work is zero since the volume is constant --> The work

P-v diagram: http://i.imgur.com/Kz0cVVP.jpg

2. Sep 2, 2015

### Staff: Mentor

There seems to be some missing information, like the total amount of water in the tank. Please write out the exact statement of the problem.

Chet

3. Sep 2, 2015

### JasonHathaway

That's the exact statement of the problem. I guess we have to assume that the tank is full of water, which means that the volume of water is 1 m3.

4. Sep 2, 2015

### HallsofIvy

Staff Emeritus
You said the tank contained a "saturated liquid". What is a saturated liquid?

5. Sep 2, 2015

### Staff: Mentor

Assuming that the tank is full, what is the specific volume of saturated liquid water at a saturation pressure of 0.2 MPa? What is the specific volume of saturated liquid water at a saturation pressure of 0.1 MPa?

Chet