An insulated rigid tank initially contains 1.4-kg saturated liquid water at 200°C and air. At this state, 25 percent of the volume is occupied by liquid water and the rest by air. Now an electric resistor placed in the tank is turned on, and the tank is observed to contain saturated water vapor after 20 min. Determine (a) the volume of the tank, (b) the final temperature, and (c) the electric power rating of the resistor.

Define the low pressures (below the triplepoint value), solids evaporate without melting first (sublimation).

4. A 4 m storage tank is filled with steam and maintained at a constant temperature of 250°C. The initial pressure is 20 bar. A valve is opened and 1 kg/min of steam leaves the tank, What is the initial mass of the steam in the tank? How much time does it take for the pressure to decrease to 5 bar? [CO2]

Give the phase for the following states a. CO₂ at T = 40 [°C] and P = 0.5 MPa b. H₂O at T= 260 [°C] and P = 5 MPa c. Air at T = 20 [°C] and P = 200 kPa d. NH3 at T 170 [°C] and P = 600 kPa R-410A at T = 0 [°C] and P = 350 kPa e.