Question

In one stroke of a reciprocating compressor, Nitrogen is isothermally and reversibly compressed in a piston + cylinder from 298 K and 20 bar to 200 bar. Assume 2 moles of gas are processed per stroke, and the molecular weight of the Nitrogen is 28 kg/kmol, compute the heat removal (Q) and work (WEC) required in kJ/kg.

Answer #1

Three kilograms of nitrogen gas at 27 °C, 0.15 MPa are
compressed isothermally to 0.3 MPa in a piston-cylinder device.
Determine the minimum work of compression, in kJ.

12 moles of a gas is compressed isothermally and reversibly from
400 K , 1 bar to 1/2th of its original volume. Initial
volume of the gas was measured at 120 cm^3. Using the truncated
virial EOS, calculate the required work for the compression.

10 kg of H2O is reversibly compressed from 600 kPa and 600 oC to
1 MPa in an insulated piston- cylinder assembly. Calculate (a)
entropy change (kJ/K) of the system and (b) the final
temperature.

Two moles of nitrogen are initially at 10 bar and 600 K (state
1) in a horizontal piston/cylinder device. They are expanded
adiabatically to 1 bar (state 2). They are then heated at constant
volume to 600 K (state 3). Finally, they are isothermally returned
to state 1. Assume that N 2 is an ideal gas with a constant heat
capacity as given on the back flap of the book. Neglect the heat
capacity of the piston/cylinder device. Suppose that...

A cylinder with a moveable piston holds 1.20 mol of argon at a
constant temperature of 295 K. As the gas is compressed
isothermally, its pressure increases from 101 kPa to 145 kPa.
(a) Find the final volume of the gas. (answer in:
m3)
(b) Find the work done by the gas. (answer in: kJ)
(c) Find the heat added to the gas. (.. kJ)

Ammonia is to be isothermally compressed in a specially designed
turbine from 1 barr and 100 degrees celsius to 50 bar. If the
compression is done reversibly, compute the heat and work flows
needed per mole of ammonia if
a. ammonia obeys the principle of corresponding states of Sec
6.6
b. Ammonia satisfies the Clausius equation of state
P(V-b)=RT with b= 3.730 x 10^-2 m3/kmol.
c. Ammonia obeys the Peng-Robinson equation of state

Carbon dioxide (CO2) is compressed in a
piston–cylinder assembly from p1 = 0.7 bar,
T1 = 280 K to p2 = 14 bar.
The initial volume is 0.2 m3. The process is described
by pV1.25 = constant.
Assuming ideal gas behavior and neglecting kinetic and potential
energy effects, determine the work and heat transfer for the
process, each in kJ, using constant specific heats evaluated at 300
K, and data from Table A-23.

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
cylinder is 0.1286 kg, determine
a)...

A two-part compressor operates with steady state conditions. The
exit of the first part of the compressor is also the inlet of the
second part of the compressor. In the first part of the compressor,
air is compressed from 1.5 bar, 350 K to 5.5 bar with a mass flow
rate of 7.2 kg/sec. In the second part of the compressor, air is
compressed from 5.5 bar to 9.5 bar with a mass flow rate of 5.8
kg/sec. Each unit...

A cylinder with a piston contains 0.100 mol of nitrogen at
2.00×105 Pa and 320 K . The nitrogen may be treated as
an ideal gas. The gas is first compressed isobarically to half its
original volume. It then expands adiabatically back to its original
volume, and finally it is heated isochorically to its original
pressure.
A) Find the work done by the gas during the initial
compression
B) Find the heat added to the gas during the initial
compression...

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