Question

A well-insulated (no heat transfer) piston cylinder contains 2 kg of saturated water vapor at 1 MPa. Steam expands reversibly until the pressure drops to 0.5 MPa. Find the final temperature of water and the work done during the expansion in kJ.

Answer #1

A piston-cylinder device initially contains 75 g of saturated
water vapor at 340 kPa . A resistance heater is operated within the
cylinder with a current of 0.6 A from a 300 V source until the
volume doubles. At the same time a heat loss of 7 kJ occurs.
Part A)Determine the final temperature (T2).
Part B)Determine the duration of the process.
Part C)
What-if scenario: What is the final
temperature if the piston-cylinder device initially contains
saturated liquid water?

Entropy From Steam Tables
A piston-cylinder assembly contain 2 kg of water. The water is
initially at the pressure of 0.5 MPa and the temperature of 300°C.
The water is cooled down at constant pressure process until it is a
saturated vapor. Determine the change in the entropy of the
system.

A piston-cylinder apparatus contains 4 kg of saturated liquid
water at 35˚C. The piston’s cross sectional area is 0.06 m2 , and
initially it is resting on stops, enclosing a volume of 0.03 m3 .
To raise the piston, a pressure of 300kPa has to be applied. Heat
is transferred until the volume is 0.075 m3 , at which point the
piston encounters a linear spring. To deflect the spring 1 m, a
force of 360 kN is required. More...

Water, initially (state 1) a saturated liquid at
1100C, is contained in a piston-cylinder assembly. The
water undergoes a process to the corresponding saturated vapor
(state 2), during which the piston moves freely in the cylinder. If
the change of state is brought about by heating the water as it
undergoes an internally reversible process at constant pressure and
temperature, determine (a) heat transfer using first law of
thermodynamics in kJ/kg and (b) heat transfer using second law of
thermodynamics...

1 kg of water in a piston cylinder arrangement is initially in a
saturated liquid state at 1 bar. It undergoes expansion at constant
pressure due to external heat supply to it, to a final state of
saturated vapor.
(i) What is the initial temperature of water in C? (a) 93.50 (b)
96.71 (c) 99.63 (d) 111.4 (e) 12.2
(ii) What is the change in enthalpy of water (kJ/kg-K)? (a)
417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1
(iii) What is...

a plunger cylinder device contains 0.8 kg of water at 4 Mpa and
500 ° C, it begins to lose heat causing the piston to descend to a
set of stops inside the cylinder, at which point saturated steam is
obtained through an isobaric process. Cooling continues until the
cylinder contains water at 1 atm pressure. The heat transferred
during this process is kJ

A
piston-cylinder device contains 3.2 kg of air at 400 kPa and 10°C.
Heat is transfered to air and the piston is allowed to expand at
constant pressure until its temperature reaches 50°C. The work done
during this expansion process is: Use kj units

A piston-cylinder contains 25 g of saturated water vapor and
kept at 300 kPa. We add to the saturated water vapor an amount of
electrical work of 7.2 kJ (via a resistance heater).
Simultaneously, we lose 3.7 kJ from the water.
1.Show the path on a PV diagram.
2.Determine the change in internal energy, the PV work, and the
enthalpy of the system.
3.Determine the final temperature of the system

A mass of one kg of water within a piston–cylinder assembly
undergoes a constant-pressure process from saturated vapor at 500
kPa to a temperature of 260°C. Kinetic and potential energy effects
are negligible. For the water:
a) Evaluate the work, in kJ,
b) If the work is 30 kJ, evaluate the heat transfer, in kJ,
c) If the heat transfer is negligible, evaluate the entropy
production in kJ/K
d) Determine if the process is reversible, irreversible, or
impossible.

If there is a piston cylinder that only has boundary work
involved. If also, it contains 1 kilogram of steam that in the
first state is a saturated vapor at 500 kPa. The system is cooled
in a reversible isothermal partial phase change until the quality
is 0.5. What is the work and heat transfer of the system?

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