A frictionless 400-mm-diameter piston sits on top of 2 kg of water in a cylinder such that the pressure is initially at 120 kPa at a temperature of 80ºC. Heat is added until the piston rises a distance of 2 m, at which state the quality of the steam is nearest:
A) 0.19
B) 0.14
C) 0.088
D) 0.034
C) 0.088
First, let’s find the height l1 the piston is above the bottom of the cylinder:
After the piston rises 2 m, the specific volume is
The pressure and specific volume at state 2 are now known for this constant-pressure process. Table
C-2 at P2 = 120 kPa provides
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