Question
In: Mechanical Engineering
A gas undergoes a process from state 1, where p1 = 60 lbf/in.2, v1 = 6.0...
A gas undergoes a process from state 1, where
p1 = 60 lbf/in.2,
v1 = 6.0 ft3/lb, to state 2 where
p2 = 99.6 lbf/in.2, according to
pv1.3 = constant. The relationship
between pressure, specific volume, and internal energy is
u = (0.2651)pv - 95.436
where p is in lbf/in.2, v is in
ft3/lb, and u is in Btu/lb. The mass of gas is
10 lb. Neglecting kinetic and potential energy effects, determine
the heat transfer, in Btu.
Solutions
samet mamat answered 2 years agoRelated Solutions
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A gas undergoes an isothermal expansion from V1=1.4L followed by isobaric compression, p=cst. if p1=4.4atm, p2=2.2atm→?Nm2,...
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calculate the total work done by the gas.
Hint:
W=∫dW=∫pdV=∫nRTVdV
A system consists of 2 kg of carbon dioxide gas initially at state 1, where p1...
A system consists of 2 kg of carbon dioxide gas initially at
state 1, where p1 = 1 bar,
T1 = 300 K. The system undergoes a power cycle
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Process 1–2: Constant volume to p2 = 2
bar.
Process 2–3: Expansion with pv1.4 =
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Process 3–1: Constant-pressure compression.
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A system consists of 2 kg of carbon dioxide gas initially at state 1, where p1...
A system consists of 2 kg of carbon dioxide gas initially at
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T1 = 300 K. The system undergoes a power cycle
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Process 1–2: Constant volume to p2 = 4
bar.
Process 2–3: Expansion with pv1.4 =
constant.
Process 3–1: Constant-pressure compression.
Assuming the ideal gas model and neglecting kinetic and potential
energy effects, calculate thermal efficiency.
An ideal gas undergoes an isothermal expansion from one state to another. In this process determine the...
An ideal gas undergoes an isothermal expansion from one state
to another. In this process determine the following
(using the sign conventions on page 413):
Q = 0, Q > 0 or Q < 0
W = 0, W > 0 or W < 0
ΔU = 0, ΔU > 0 or ΔU < 0
An ideal gas undergoes an isothermal process. Which
of the following are true (may be more than one): a) No
heat is added or removed from the gas,...
Air expands through a turbine operating at steady state. At the inlet, p1 = 150 lbf/in.2,...
Air expands through a turbine operating at steady state. At the
inlet, p1 = 150 lbf/in.2,
T1 = 1400°R, and at the exit,
p2 = 14.8 lbf/in.2,
T2 = 900°R. The mass flow rate of air entering
the turbine is 11 lb/s, and 65,000 Btu/h of energy is rejected by
heat transfer.
Neglecting kinetic and potential energy effects, determine the
power developed, in hp.
Air expands through a turbine operating at steady state. At the inlet, p1 = 150 lbf/in.2,...
Air expands through a turbine operating at steady state. At the
inlet, p1 = 150 lbf/in.2,
T1 = 1400°R, and at the exit,
p2 = 14.8 lbf/in.2,
T2 = 900°R. The mass flow rate of air entering
the turbine is 5 lb/s, and 65,000 Btu/h of energy is rejected by
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Neglecting kinetic and potential energy effects, determine the
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Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a...
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effects are negligible.
Determine the heat transfer, in Btu per lb of steam, for a
polytropic exponent of 1.4,
(a) using data from the steam tables.
(b) assuming ideal gas behavior.
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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
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Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...
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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.
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