Question

A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 125 kPa. Initially. 3 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 10%. We denote the initial state as state I, the state where the piston starts to move as state 2. and the final state as state 3. Answer the following questions: (a) Determine the temperatures at all the three states; (b) Determine the work done during process 1 to 2, and that during process 2 to 3 (c) Determine the heat transfer during process 1 to 2. and that during process 2 to 3 (d) Show the entire process on a P-V diagram with respect to the saturation lines H,O m 5 kg

Answer 1

e. @ skJe L.. R= 125kpa, @ Rz 125 kpt, Tged = T= ‘0G은 he hf4%、ちこ 444.4+604x 2290.8): 1340·72kT19 PConsr. Volume proces , 2e$こ0594 쉬与: b. @i-30 kra , 거으 Ο.qo8 proces 13· Const. Pessure Poes Consł. volume pdcess c)

PYoress 2-3 СКР 1