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A steam turbine has an inlet of 2 kg/* water at 1000 kPa, 350°C and velocity of 15 m/*. The exit is at 100 kPa, x = 1 and very
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Apr 6, 2019
in
Mathematics
by
kratos
turbines
available energy
thermodynamics
reversible work
law efficiency
expanders
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1
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Find the specific reversible work for a steam turbine with inlet 4 MPa, 500°C and an actual exit state of 100 kPa, x = 1.0 with a 25°C ambient.
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Mar 31, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible work
law efficiency
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1
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In a co-flowing (same direction) heat exchanger 1 kg/* air at 500 K flows into one channel and 2 kg/* air flows into the neighboring
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Mar 30, 2019
in
Mathematics
by
kratos
availability
thermodynamics
reversible processes
law efficiency
steady state
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1
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Air enters a compressor at ambient conditions, 100 kPa, 300 K, and exits at 800 kPa. If the isentropic compressor efficiency is 85%,
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Mar 30, 2019
in
Mathematics
by
kratos
bernoulli
thermodynamics
device efficiency
reversible shaft work
law efficiency
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A counter-flowing heat exchanger conserves energy by heating cold outside fresh air at 10°C with the outgoing combustion gas
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Mar 19, 2019
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Mathematics
by
kratos
availability
thermodynamics
reversible processes
heat transfer
law efficiency
steady state
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1
answer
In time t, an amount of heat Q flows through the solid door of area A and thickness d represented.
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Mar 18, 2019
in
Mathematics
by
kratos
transient processes
availability
thermodynamics
pipe
pumps
law efficiency
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1
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Are reversible work and availability (exergy) connected?
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Mar 15, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
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1
answer
Air at 600 K flows with 3 kg/* into a heat exchanger and out at 100°C. How much (kg/*) water coming in at 100 kPa, 20°C
asked
Mar 9, 2019
in
Mathematics
by
kratos
heat exchangers
availability
thermodynamics
law efficiency
exergy balance equation
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1
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Evaluate the steady state exergy fluxes due to a heat transfer of 250 W through a wall with 600 K on one side and 400 K on the other side.
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Feb 22, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
exergy balance equation
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1
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Calculate the second law efficiency of the coflowing heat exchanger has one line with 0.25 kg/* oxygen at 17°C, 200 kPa entering
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Feb 22, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
law efficiency
steady state
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1
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A coflowing heat exchanger has one line with 2 kg/* saturated water vapor at 100 kPa entering. The other line is 1 kg/* air at 200 kPa,
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Feb 20, 2019
in
Mathematics
by
kratos
carnot cycles
thermodynamics
reversible processes
law efficiency
steady state
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1
answer
A steam turbine inlet is at 200 psia, 900 F. The exit is at 40 psia. What is the highest possible exit temperature?
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Feb 13, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
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votes
1
answer
A steam turbine inlet is at 1200 kPa, 500°C. The exit is at 200 kPa. What is the highest possible exit temperature? Which efficiency
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Feb 9, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
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1
answer
A steam turbine inlet is at 200 psia, 900 F. The exit is at 40 psia. What is the lowest possible exit temperature? Which efficiency
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Feb 7, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
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1
answer
Steam enters a turbine at 25 MPa, 550°C and exits at 5 MPa, 325°C at a flow rate of 70 kg/*. Determine the total power output of the turbine,
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Jan 25, 2019
in
Mathematics
by
kratos
thermodynamics
law efficiency
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1
answer
A gasoline engine produces 20 hp using 35 kW of heat transfer from burning fuel. What is its thermal efficiency
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Jan 24, 2019
in
Mathematics
by
kratos
thermodynamics
refrigerators
law efficiency
heat engines
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1
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A small turbine delivers 150 kW and is supplied with steam at 700°C, 2 MPa. The exhaust passes through a heat exchanger where
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Jan 23, 2019
in
Mathematics
by
kratos
thermodynamics
pipe
device efficiency
processes multiple devices
pumps
law efficiency
steady state
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1
answer
A man is watching two trains, one leaving and the other coming with equal speed of 4 m/*.
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Jan 2, 2019
in
JEE
by
kratos
heights and distances
waves
forgetting
class-11
jee
thermodynamics
class-10
jee mains
law efficiency
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1
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Steam is supplied in a line at 3 MPa, 700°C. A turbine with an isentropic efficiency of 85% is connected to the line by a valve and it
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Dec 30, 2018
in
Mathematics
by
kratos
thermodynamics
law efficiency
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1
answer
Air enters the turbocharger compressor (of an automotive engine at 100 kPa, 30°C, and exits at 170 kPa. The air is cooled by 50°C
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Dec 15, 2018
in
Mathematics
by
kratos
thermodynamics
irreversibility
law efficiency
device efficiency
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