Question

Steam is confined in a piston cylinder arrangement with an initial volume of 0.625 cubic meters, an initial temperature of 150 degrees C, and an initial pressure of 16 pounds per square inch. Then the piston is slowly moved so that the steam's volume is decreased by 0.075 cubic meters in an isothermal process. Calculate:

a. the final pressure

b. the work done by the steam

c. the change in the steam's internal energy

d. the change in entropy of the steam

e. whether the total entropy of the universe is increased or decreased by this process

f. draw this on a P-V diagram

Answer #1

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 cylinder of monatomic ideal gas is sealed in a cylinder by a
piston. Initially, the gas occupies a volume of 3.00 L and the
pressure is initially 105 kPa. The cylinder is placed in an oven
that maintains the temperature at a constant value. 65.0 J of work
is then done on the piston, compressing the gas (in other words,
the gas does −65.0 J of work). The work is done very slowly so that
the gas maintains a...

This question relates to thermodynamics.
in an adiabatic piston cylinder arrangement:
if state 1 pressure is known and work is done by the piston to
compress a water mixture can the temperature at state 2 be read off
the steam tables by using the value of internal energy at state 1
and adding the work to it? If so does this then become the
enthalphy i.e. internal energy + work = enthalphy.
And then using this enthaphy and the given...

A piston/cylinder device operating in a cycle with steam as the
working fluid executes the following steps: (1) steam at 550 kPa
and 200 degrees celsius is heated at constant volume to a pressure
of 800 kPa. (2) It then expands, reversibly and adiabatically, to
the initial temperature of 200 degrees celsius. (3) Finally, the
steam is compressed in a mechanically reversible, isothermal
process to the initial pressure of 550 kPa.
Please show all the steps, and please do not...

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.

Oxygen gas is contained in a piston cylinder assembly at an
initial pressure of 1000 kPa and expands from 0.2 m3 to 1.0 m3 by a
process where PV = constant. The gas has an internal energy change
of -200 kJ. Calculate the work (kJ) and the heat transfer (kJ) done
during the process.

A gas is enclosed in a cylinder fitted with a light frictionless
piston and maintained at atmospheric pressure. When 254 kcal of
heat is added to the gas, the volume is observed to increase slowly
from 12.0 m3 to 16.2 m3 .
A. Calculate the work done by the gas
B. Calculate the change in internal energy of the gas.

A closed piston-cylinder system contains a 120
moles of neon, a monatomic ideal gas, at pressure
PA = 2.5 atm
and volume VA = 0.80
m3. It undergoes the following cyclic
process:
A -> B: I
There is isothermal expansion to volume double of the original.
B -> C:
Constant-volume process back to its original pressure .
C -> A:
Constant-pressure process back to its initial state
a) Draw a Pressure volume diagram for the cycle. You
don't need to...

In a cylinder/piston arrangement, air is compressed in a
reversible polytropic process to a final state of 800 kPa, 500 K.
Initially air is at 110 kPa and 25oC. During the
compression process heat transfer takes place with the ambient
maintained at 25oC. Assume air as an ideal gas (R =0.287
kJ/kg) and has constant specific heats of Cp = 1.004
kJ/kgK and Cv = 0.717 kJ/kgK. If the mass of air in the
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a)...

Your new engine design consists of a piston cylinder
arrangement. The engine operates with mostly air and a small amount
of fuel. The system undergoes a cycle. The initial Pressure and
temperature are p1= 1bar and T1= 27°C. The system undergoes a power
cycle consisting of the following process:
Process
1-2
constant volume to a pressure, P2 of 4 bars
Process
2-3
expansion of pv=constant
Process 3-1
constant-pressure compression
Draw the system and pv diagrams
If P2 is 4...

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