Question

A piston-cylinder device contains 0.54 kg of steam at 300 degrees C and 3 MPa. Steam is cooled at constant pressure until one-half of the mass condenses. (A) Find the final temperature (B) Determine the volume change

Answer #1

A piston-cylinder device contains 0.9 kg of steam at
350⁰C and 1.4 MPa. Steam is cooled at constant
pressure until one-half of the mass condenses.
(a) show the process on a T-v and P-v diagrams,
(b) find the final temperature and
(c) determine the volume and entalphy changes.

A piston-cylinder device with a set of stops initially contains
0.35 kg of steam at 1.0 MPa and 900 degrees C. The location of the
stops corresponds to 44 percent of the initial volume. Now the
steam is cooled. Determine the magnitude of the compression work if
the final state is (A) 1.0 MPa and 600 degrees C and W=. kJ (B) 500
kPa. W=. kJ (C) Also determine the temperature at the final state
in part (B). T2=. C

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.

H3.3 A frictionless piston-cylinder device contains 2 kg of H2O
initially at T1 = 300◦C and p1 = 5 bar. The device is cooled at
constant pressure until the volume is ∀2 = 0.5 m3 . Assume a
quasiequillibrium process which occurs slowly with no acceleration
as the piston moves. Kinetic and potential energy effects are
negligible. Determine: a. work [kJ] during process (indicate
magnitude and direction) b. heat transfer [kJ] during process
(indicate magnitude and direction)

2 kg of steam initially at 2.00 MPa and 225?C expands in a
piston-cylinder assembly until the final pressure is 0.10 MPa.
During the process, the temperature of steam is kept constant by
keeping it in a constant temperature atmosphere at 225?C. a. What
is the maximum amount of work that can be produced? What is the
entropy change of steam? What is the entropy change of the
universe? b. Suppose that the actual work done is 80% of the...

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 0.15 kg of air initially at 2
MPa and 350 C. First, the air expands isothermally to a pressure of
500 kPa. Then, it is compressed polytropically back to the initial
pressure (2 MPa) with a polytropic exponent of 1.2. Find the work
performed or introduced by or to the air for each process. Express
it both times in kJ.

A piston cylinder device contains a mixture of 0.2 kg of H2 and
1.6 kg of N2 at 100 kPa and 300K. Heat is now transferred to the
mixture at constant pressure unitl the volume is doubled. Assuming
constant specific heats at the average temperature (the constant
pressure specific heats of H2 and N2 are 14.501 kJ/kg°K and 1.049
kJ/kg°K, respectively), determine: a) the heat transfer. b) the
entropy change of the mixture.

A piston-cylinder contains 2 kg of refrigerant R-134a at
temperature -20 degrees Celsius and a quality of 20% is heated in
device until it reaches a saturated mixture with quality 60%. a)
Show process on a P-v and P-T diagram b) What is the pressure? c)
What is the change in volume? d) What is the change in the internal
energy? e) Redo the problem if the piston-cylinder assembly is
replaced with a rigid container.

A piston cylinder device contains 5 kg of Refrigerant 134a at
800 kPa and 70 C. The refrigerant is now cooled at constant
pressure until it reaches a saturated vapor state. How much heat
was lost in the process? Express your result in kJ and you may
ignore the negative sign.

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