Question
In: Mechanical Engineering
The volume of 1 kg of helium in a piston-cylinder device is initially 7 m3 ....
The volume of 1 kg of helium in a piston-cylinder device is initially 7 m3 . Now helium is compressed to 3 m3 while its pressure is maintained constant at 150 kPa. Determine the initial and final temperatures of helium as well as the work required to compress it, in kJ. You may assume deal gas behavior.
Solutions
samet mamat answered 2 years agoRelated Solutions
A piston–cylinder device initially contains 2 kg water in 1 m3 at 500 kPa. The system...
A piston–cylinder device initially contains 2 kg water in 1 m3
at 500 kPa. The system then cools down and the volume drops to half
and pressure of 300 kPa. At this state, the piston is resting on a
set of stops, and the mass of the piston is such that a pressure of
500 kPa is required to move it. (a) Show the process on a P-v, T-v
and P-T diagrams with respect to saturation lines and determine,
(b)...
Consider a piston cylinder device with a volume of 0.04 m3 and initially contains air at 293 K and 1 bar.
Consider a piston cylinder device with a volume of 0.04 m3 and initially contains air at 293 K and 1 bar. It is desired to reverse the cycle and use it as a refrigerator. In this case the process would begin with PV1.36 = constant process from an initial state of 293 K and a pressure of 10 Bars. The gas is allowed to expand to a volume 3.5 times the volume of state 1. It then follows a...
A piston-cylinder device initially has a volume of 1.5 m3 containing steam at 300 kPa absolute...
A piston-cylinder device initially has a volume of 1.5 m3
containing steam at 300 kPa absolute and 150 oC. It is then heated
so it expands at constant pressure until it reaches a temperature
of 400 oC.
Draw a diagram of the device showing system boundary and flows
of energy. What boundary work is done by the cylinder, in kJ,
during the expansion? State your assumptions.
1. What is the mass of steam in the piston-cylinder?
2. How much heat...
A piston-cylinder device, whose piston is resting on a set of stops, initially contains 2 kg...
A piston-cylinder device, whose piston is resting on a set of
stops, initially contains 2 kg of air at 300 kPa and 27ºC. The mass
of the piston is such that a pressure of 600 kPa is required to
move it upward. Heat is now transferred to the air until its volume
doubles.
a) Determine the work done by the air and b) the total heat
transferred to the air during this process. c) Also, sketch the
process on a...
A piston-cylinder device initially contains 0.3 m3 of nitrogen gas at 350 kPa and 35 ℃.
A piston-cylinder device initially contains 0.3 m3 of nitrogen gas at 350 kPa and 35 ℃. An electric heater within the device is turned on and is allowed to pass a 240W for 6 minutes. Nitrogen expands at constant pressure, and a heat loss of 3000 J occurs during the process. Determine the final temperature of the nitrogen. (Average CP for Nitrogen is 1.039 kJ/kgK and molecular weight of Nitrogen is 28.01 kg/kmol.)
A piston–cylinder assembly contains propane, initially at 27°C, 1 bar, and a volume of 0.1 m3....
A piston–cylinder assembly contains propane, initially at 27°C,
1 bar, and a volume of 0.1 m3. The propane undergoes a process to a
final pressure of 4 bar, during which the pressure–volume
relationship is pV1.1 = constant. For the propane, evaluate the
work and heat transfer, each in kJ. Kinetic and potential energy
effects can be ignored.
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has
initial volume of 0.5L. The device starts and goes through a Carnot
cycle and generates 500.3 kJ work. If the maximum temperature that
water will reach is 1.5 times the minimum temperature of water and
during heat rejection process, water goes from saturated vapor to
saturated liquid phase
Find:
1. QH & QL for this cycle (10 points).
2. TH & TL for this cycle (10 points).
3. Maximum and...
A piston cylinder device containing 0.5 kg of water has initial volume of 0.5L. The device...
A piston cylinder device containing 0.5 kg of water has initial
volume of 0.5L. The device starts and goes through a Carnot cycle
and generates 500.3 kJ work. If the maximum temperature that water
will reach is 1.5 times the minimum temperature of water and during
heat rejection process, water goes from saturated vapor to
saturated liquid phase. Find:
1. QH & QL for this cycle .
2. TH & TL for this cycle.
3. Maximum and minimum pressures that...
A piston-cylinder assembly has initially a volume of 0.3 m3 of air at 25 oC. Mass...
A piston-cylinder assembly has initially a volume of 0.3 m3 of
air at 25 oC. Mass of the air is 1 kg. Weights are put on the
piston until the air reaches to 0.1 m3 and 1,000 oC, in which the
air undergoes a polytropic process (PVn = const). Assume that heat
loss from the cylinder, friction of piston, kinetic and potential
effects are negligible. 1) Determine the polytropic constant n. 2)
Determine the work transfer in kJ for this...
100 kg of R-134a at 320 kPa are contained in a piston-cylinder device whose volume is...
100 kg of R-134a at 320 kPa are contained in a piston-cylinder
device whose volume is 7.530 m3. The piston is now moved
until the volume is one-half its original size. This is done such
that the pressure of the R-134a does not change. Determine the
final temperature and the change in the total internal energy of
the R-134a. (Round the final answers to two decimal places.)
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