Question

Superheated steam at 0.10MPa and 300C inside a cylinder of volume 3.0 liters drives a piston in a steam locomotive cylinder. It expands isobarically. By what multiple can the volume grow before the system becomes a saturated liquid-gas mixture? At this point, how much boundary work will have been done on the piston?

Answer #1

Three kilograms (3.0 kg) of saturated steam at 162oC is held in
a closed piston-cylinder apparatus with a weighted piston that
exerts a constant force on the steam. The piston-cylinder apparatus
loses energy to the surroundings such that at a certain point 50%
of the steam has condensed to a saturated liquid inside the
cylinder (NOTE: the vapor and liquid are still saturated at the new
condition).
a. For the process described above, determine the heat exchange
with the surroundings....

Constant amount of ideal gas is kept inside a cylinder by a
piston. Then the gas expands isobarically. Compare the initial (i)
and the final (f) physical quantities of the gas to each other.
The internal energy Uf is ... Ui.
The temperature Tf is ... Ti.
The volume Vf is ... Vi.
The entropy Sf is ... Si.
The pressure pf is ... pi.

1- A certain amount of O2, as an ideal gas, is contained in a cylinder-piston system and develops a process from T1 = 300 K, P1 = 200 kPa to T2 = 1500 K and P2 = 150 kPa. Determine the specific entropy change in kJ / (kg K).
2- A certain amount of H2O in a closed rigid cylinder is cooled from T1 = 800 ° F and P1 = 100 lbf / in2 to P2 = 20 lbf...

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