Question

Saturated water vapour at 60°C has it's pressure decrease to increase the volume by 10% keeping the temperature constant. To what pressure Should be expands.

Answer 1

We are given following data for saturated vapor water:

T = 60°C

V₂ = 1.1V₁

From Saturated Water table B.1.1. corresponding to T = 60°C we can obtain stage 1 pressure and specific volume:

Final specific volume is equal to:

From Saturated Water table B.1.3. corresponding to P = 10kPa and T = 50°C we can obtain specific volume:

From Saturated Water table B.1.3. corresponding to P = 10kPa and T = 100°C we can obtain specific volume:

By using method of linear interpolation we can find specific volume of water for temperature T = 60°C:

We can now calculate final pressure corresponding to temperature T = 6060°C with method of linear interpolation by using:

Final pressure is equal to: