Problem 1: A 0.5m3 sealed rigid vessel contains 15 kg of water (phase unknown) at 120 °C. Heat is added until the steam becomes saturated vapor.
a) Determine the state of water before heating.
b) Determine the pressure and temperature at the end of heating.
c) Determine the amount of heat.
d) How much heat should be removed from the tank in order for the steam to become saturated liquid?
Problem 2: A3m3 tank is divided into two parts via a thermally insulated wall. One part has a volume of 2 m3 and contains a vapor-liquid mixture of steam, 7% liquid, at 5 bar. The other part contains steam at 10 bar, 500 °C. A valve is opened and allows the two parts to thoroughly mix.
a) Determine the final pressure and temperature in the tank assuming no losses to the surroundings.
b) Determine the amount of heating or cooling that must be supplied in order to make the final pressure 5 bar.