Question

An insulated cylinder fitted with a movable piston to maintain
constant pressure initially contains 100 g of ice at -10 C. Heat is
supplied to the contents at a constant rate by a 100 W heater. Make
a graph showing temperature of the cylinder contents as a function
of time starting at t = 0, when the temperature is -10 C and ending
when the temperature is 110 C. ( c = 2.0 kJ/ kg K for specific heat
of ice from -10 to 0 C and of the steam from 100 to 110 C)

Answer #1

An insulated piston–cylinder device initially contains
20 L of air at 140 kPa and 27 °C. Air
is now heated for 10 min by a 100-W resistance heater placed inside
the cylinder. The pressure
of air is maintained constant during this process, and the
surroundings are at 27 °C and 100 kPa.
Determine the exergy destroyed during this process.

An insulated cylinder is fitted with an airtight piston that is
free to slide up and down and is connected to a rod. Contained
within the cylinder is an ideal gas initially at a pressure of 120
kPa and temperature of 293 K. Suddenly the piston is forced
downward creating an additional 200 kPa
of pressure on the gas and as a result the cylinder volume
decreases to one-half of its original volume.
(a) What is the final temperature of...

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 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 0.2 m3 piston-cylinder initially contains 400 K air. A heavy
frictionless piston maintains a pressure of 500 kPa abs. Then, a
weakness in the cylinder wall blows out and creates a hole. Air
escapes through the hole until the piston drops far enough to cover
the hole. At that point, the volume is half the initial volume.
During this process, 75 kJ of heat is transferred to the 100 kPa,
300 K surroundings. Using Cp = 1.005 kJ/kg-K and...

The piston-cylinder system is filled with a steam of 2.5m3 at 10
barometric pressure and 450oC. When the condensation is about to
start by cooling at a constant pressure.
(1) steam mass; (2) final temperature; (3) heat transfer;

A well-insulated 0.2kg copper bowl contains 0.10kg of ice, both
at −10◦ C. A very hot 0.35kg copper cylinder is dropped into it and
the lid quickly closed. The final temperature of the system is
100◦C, with 5g of steam in the container.
(a) How much heat was transferred to the water (in all
phases);
(b) How much to the bowl?
(c) What must have been the original temperature of the
cylinder?
The specific heat of copper is 386 J/kg·K....

A piston cylinder contains 2 lbm of air and operates at a
constant pressure of 400 psia. The initial volume is 1 ft.3 and the
initial temperature is 100°F. The final volume is 4 ft.3 and the
final temperature is 1780°F. Determine the work and its direction
(in or out) and the heat transfer and its direction, in
Btu/lbm.

A piston cylinder device contains air with a volume of 0.05 m3
at 25oC and 100 kPa pressure. The gas is now compressed to a final
temperature of 95oC at 250 kPa. This compression is polytropic and
follows PVn=constant.
a. Determine how much boundary work was added to the gas [in
kJ]
b. How much heat was added or removed from this system during
this process? [in kJ]

A cylinder fitted with a frictionless, massless piston contains
compressed liquid water at a temperature T1=20C. The atmospheric
pressure on the outside of the system is P=1.0 bar. Heat is then
added until the water is completely converted to saturated
vapor.
(a) What are the changes in specific volume, v2-v1
(m3/kg) and internal energy, u2-u1 (kJ/kg) of the water
for this process?
(b) How much specific work, if any, is done by the system?
(c) What is the amount of...

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