Question

A device uses a Stirling cycle on 378 moles of a monatomic ideal gas between two reservoirs with temperatures of 389 K and 659 K as a refrigerator or a heat pump. The volume of the system shifts between 0.94 m3 and 2.44 m3.

1) How much energy does this device remove from the cold reservoir?

2)How much energy does this device transfer into the hot reservoir?

3)How much work is done by the device on the gas?

4)What is the coefficient of performance of this engine if we use it to cool a refrigerator?

Answer #1

Rectangular PV Cycle
A piston contains 260 moles of an ideal monatomic gas that
initally has a pressure of 2.61 × 105 Pa and a volume of
4.9 m3. The piston is connected to a hot and cold
reservoir and the gas goes through the following quasi-static cycle
accepting energy from the hot reservoir and exhausting energy into
the cold reservoir.
1. The pressure of the gas is increased to 5.61 × 105
Pa while maintaining a constant volume.
2....

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...

1. a) Suppose 2 moles of a monatomic ideal gas
occupies 5 m3 at a pressure of 1600 Pa.
First: Find the temperature of the gas in Kelvin.
Answer: 481 K
Second: Find the total internal energy of the gas.
Answer:12000 J
1. b) Suppose the gas undergoes an isobaric
expansion to a volume of 7 m3.
(Don’t forget to include + and – in each of the
problems below)
First: Find Q
Answer: 8000 J
Second: Find W
Answer:...

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

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