題組內容

(2) Steam is leaving a 4-liter pressure cooker whose operating pressure is 150 kPa. It is observed that the amount of liquid in the cooker has decreased by 0.6 liter in 40 minutes after the steady operating conditions are established, and the cross-sectional area of the exit openting is 8 mm2. Determine

(c) the flow work per unit mass (5%). At 150 kPa, we know that the specific volume for saturated liquid water and saturated water vapor are vf= 0.001053 m3/kg and vg= 1.1594 m3/kg, respectively. The internal energy for saturated liquid water and saturated water vapor are uf= 466.97 kJikg and ug= 2519.2 kJfkg, respectively. The enthalpy for saturated liquid water and saturated water vapor are hf = 467.13 kJkg and hg = 2693.1 k.I/kg, respectively.