A rigid tank is divided into two compartments each 0.75 m3 separated by a barrie

Question

A rigid tank is divided into two compartments each 0.75 m3 separated by a barrier. Compartment I contains 5 kg of H2O at 50 degree C. Compartment II contains 2 kg of H2O at a pressure of 1 MPa. The barrier is broken and heat is transferred until the system reaches equilibrium with the surroundings at 100C as a saturated mixture. Calculate the initial pressure in I 12.3 kPa Initially, in I (circle): Comp liq - Sat liq - Sat mix - Sat vap - Superheated vapor Calculate the initia temperature in II 545 C Initially, in II (circle): Comp liq - Sat liq - Sat mix - Sat vap - Superheated vapor Calculate the quality of the final saturated mixture 0.128 Calculate the heat transfer for the process -2450 kJ

Explanation / Answer

1) initial pressure = nRT/V = (5/18) * 8.314 * 323/ 0.75

2) initial temp = PV/nR = 10^6 * 0.75 / (2/18)*8.31 = 545 C

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