Question
In: Mechanical Engineering
Air within a piston cylinder assembly executes a Carnot refrigeration cycle between hot and cold reservoirs...
Air within a piston cylinder assembly executes a Carnot
refrigeration cycle between hot and cold reservoirs at TH=500 K and
TC=300 K, respectively. The magnitude of the heat transfer rejected
to the high temperature reservoir is 250 kJ per kg of air. The
pressure at the start of the isothermal expansion is 325 kPa. The
air can be modeled as an ideal gas with constant specific
heat.
For the air as a system, determine
a. (5) the coefficient of performance.
b. (5) the net work input to the cycle in kJ/kg.
c. (10) the Pv and Ts diagrams for the cycle with arrows showing
the directions of the processes.
Solutions
samet mamat answered 2 years agoRelated Solutions
Air within a piston-cylinder assembly execute an ideal Carnot power cycle within maximum and minimum temperatures...
Air within a piston-cylinder assembly execute an ideal Carnot
power cycle within maximum and minimum temperatures of 600 K and
300 k, respectively. The heat added at the high temperature is 250
kJ/kg. The lowest pressure in the cycle is 75 kPa. Assuming the
ideal gas model for the air (constant cv, cp, k, with the following
properties: kair = 1.4, cv,air = 0.717 J/g.K, Mair = 28.97 g/mol,
Universal Gas Constant 8.314 /( . ) _ R = J...
Q2. Two kilograms of air within a piston-cylinder configuration execute a Carnot power cycle between temperatures...
Q2. Two kilograms of air within a piston-cylinder configuration
execute a Carnot power cycle between temperatures 750 K and 300 K.
The isothermal expansion is associated with a heat input of 60 kJ
from the surroundings. The volume after expansion has occurred
isothermally is 0.4 m3 . Assuming air behaves as an ideal gas,
calculate: (i) thermal efficiency for the cycle (ii) pressure and
volume at the beginning of the isothermal expansion, in kPa and m3
, respectively. (iii) the...
Q2. Two kilograms of air within a piston-cylinder configuration execute a Carnot power cycle between temperatures...
Q2. Two kilograms of air within a piston-cylinder configuration
execute a Carnot power cycle between temperatures 750 K and 300 K.
The isothermal expansion is associated with a release of 60 kJ of
heat into the surroundings. The volume after expansion has occurred
isothermally is 0.4 m3 . Assuming air behaves as an ideal gas,
calculate: (i) thermal efficiency for the cycle (ii) pressure and
volume at the beginning of the isothermal expansion, in kPa and m3
, respectively. (iii)...
A Carnot heat engine within a piston cylinder has 10 kg of air as the working...
A Carnot heat engine within a piston cylinder has 10 kg of air
as the working fluid and operates between 1000 K and 350 K. During
the heat addition process the pressure changes by a factor of 2.5.
The volume at the end of the isentropic compression process is
5m^3. Determine the pressure at each state in kPa and the net heat
of the cue in KJ assuming Constant Heats at 300 K. Draw a P-v and
T-s diagram
Thirty-six grams of air in a piston–cylinder assembly undergo a Stirling cycle with a compression ratio...
Thirty-six grams of air in a piston–cylinder assembly undergo a
Stirling cycle with a compression ratio of 7.5. At the beginning of
the isothermal compression, the pressure and volume are 1 bar and
0.03 m3, respectively. The temperature during the
isothermal expansion is 1200 K.
Assuming the ideal gas model and ignoring kinetic and potential
energy effects, determine:
(a) the net work, in kJ.
(b) the percent thermal efficiency.
(c) the mean effective pressure, in bar.
Air within a piston–cylinder assembly, initially at 15 lbf/ in.2, 510°R, and a volume of 6...
Air within a piston–cylinder assembly, initially at 15 lbf/
in.2, 510°R, and a volume of 6 ft3, is
compressed isentropically to a final volume of 1.75
ft3.
Assuming the ideal gas model with k = 1.4 for the air,
determine the:
(a) mass, in lb.
(b) final pressure, in lbf/in.2
(c) final temperature, in °R.
(d) work, in Btu.
Hot air balloons float in the air because of the difference in density between cold and...
Hot air balloons float in the air because of the difference in
density between cold and hot air. Consider a balloon in which the
mass of the pilot basket together with the mass of the balloon
fabric and other equipment is mb. The volume of the hot air inside
the balloon is V1 and the volume of the basket, fabric, and other
equipment is V2. The absolute temperature of the cold air outside
the balloon is Tc and its density...
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...
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K to p2 = 7 bar. The air is modeled as an
ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.4, determine the work and heat
transfer, each in kJ per kg of air, (1) assuming constant cv
evaluated at 300 K. (2) assuming variable specific heats.
Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K
to p2 = 3 bar. The air is modeled as an ideal
gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat
transfer, each in kJ per kg of air,
(1) assuming constant cv evaluated at 300
K.
(2) assuming variable specific heats.
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Consider the following information of Petronas Bond Description Petronas Bond Face value RM 1000 Maturity...
- Each player throws both dice once per turn. The player only scores when the player throws...
- If water is seeping, the effective stress at any point in a soil mass will be...
- QUESTION 2 [35 MARKS] Consider the following information of Petronas Bond Description Petronas Bond Face value...
- Do relativism and subjectivism generate contradictions? Why might someone accuse the theories of doing so? How...
- Analyze the industry environment of Walmart in 2018
- 1. In the following ordinary annuity, the interest is compounded with each payment, and the payment...
ADVERTISEMENT