Question

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

Answer #1

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...

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.

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

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?

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 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 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

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.

0.75 kg of refrigerant-134a at 120 kPa and 20°C
initially fills a piston-cylinder device. Heat is now transferred
to the refrigerant from a source at 150°C, and the piston which is
resting on a set of stops, starts moving when the pressure inside
reaches 140 kPa. Heat transfer continues until the temperature
reaches 90°C. Assuming the surrounding to be at 25°C and 100 kPa,
determine (a) the work done, (b) the heat transfer, (c) the exergy
destroyed, and (d) the...

0.75 kg of refrigerant-134a at 120 kPa
and 20°C initially fills a piston-cylinder device. Heat is now
transferred to the refrigerant from a source at 150°C, and the
piston which is resting on a set of stops, starts moving when the
pressure inside reaches 140 kPa. Heat transfer continues until the
temperature reaches 90°C. Assuming the surrounding to be at 25°C
and 100 kPa, determine (a) the work done, (b) the heat transfer,
(c) the exergy destroyed, and (d) the...

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