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Recent questions tagged availability
+2
votes
1
answer
Nitrogen flows in a pipe with velocity 300 m/* at 500 kPa, 300°C. What is its availability with respect to an ambient at 100 kPa, 20°C?
asked
Apr 4, 2019
in
Mathematics
by
kratos
thermodynamics
availability
+2
votes
1
answer
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
asked
Mar 30, 2019
in
Mathematics
by
kratos
availability
thermodynamics
reversible processes
law efficiency
steady state
+1
vote
1
answer
Consider the springtime melting of ice in the mountains, which gives cold water running in a river at 2°C while the air temperature is 20°C.
asked
Mar 27, 2019
in
Mathematics
by
kratos
thermodynamics
availability
+1
vote
1
answer
A counter-flowing heat exchanger conserves energy by heating cold outside fresh air at 10°C with the outgoing combustion gas
asked
Mar 19, 2019
in
Mathematics
by
kratos
availability
thermodynamics
reversible processes
heat transfer
law efficiency
steady state
+3
votes
1
answer
In time t, an amount of heat Q flows through the solid door of area A and thickness d represented.
asked
Mar 18, 2019
in
Mathematics
by
kratos
transient processes
availability
thermodynamics
pipe
pumps
law efficiency
+2
votes
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
+3
votes
1
answer
Water as saturated liquid at 200 kPa goes through a constant pressure heat exchanger , The heat input is supplied from a reversible
asked
Feb 24, 2019
in
Mathematics
by
kratos
thermodynamics
availability
+1
vote
1
answer
A steady combustion of natural gas yields 0.15 kg/* of products (having approximately the same properties as air) at 1100°C, 100 kPa.
asked
Feb 18, 2019
in
Mathematics
by
kratos
thermodynamics
availability
+1
vote
1
answer
Geothermal underground hot water or steam can be used to generate electric power. Does that violate the second law?
asked
Feb 14, 2019
in
Class 11
by
kratos
multiple devices
class- 11
availability
thermodynamics
cycle processes
irreversible processes
steady state
+1
vote
1
answer
One kilogram of water at 300°C expands against a piston in a cylinder until it reaches ambient pressure, 100 kPa, at which point
asked
Feb 8, 2019
in
Mathematics
by
kratos
entropy generation
thermodynamics
availability
+3
votes
1
answer
A *** of water is boiling on a stove supplying 325 W to the water. What is the rate of mass (kg/*) vaporizing assuming
asked
Feb 7, 2019
in
Class 12
by
kratos
ordinary differential equations
energy equation
liquids
availability
heat transfer rates
solids
thermodynamics
class-12
+2
votes
1
answer
How to choose a stream as one enters class 11? Does it depend on class 10 results?
asked
Feb 6, 2019
in
JEE
by
kratos
availability
class-11
jee
thermodynamics
jee mains
class-12
+1
vote
1
answer
Can you say something about changes in m and V through a steady flow device?
asked
Feb 4, 2019
in
Mathematics
by
kratos
compressors
fans
availability
thermodynamics
steady single flow devices
device efficiency
+1
vote
1
answer
Air at 20 m/*, 260 K, 75 kPa with 5 kg/* flows into a jet engine and it flows out at 500 m/*, 800 K, 75 kPa. What is the change
asked
Jan 30, 2019
in
Mathematics
by
kratos
heat exchangers
diffusers
nozzles
thermodynamics
availability
+1
vote
1
answer
A copper block of volume 60 in.^3 is heat treated at 900 F and now cooled in a 3- ft^3 oil bath initially at 70 F. Assuming
asked
Jan 26, 2019
in
Mathematics
by
kratos
energy equation
liquids
availability
solids
thermodynamics
+1
vote
1
answer
An air compressor is used to charge an initially empty 200-L tank with air up to 5 MPa. The air inlet to the compressor is at 100 kPa, 17°C
asked
Jan 25, 2019
in
Mathematics
by
kratos
compressors
fans
compressibility factor
availability
thermodynamics
+3
votes
1
answer
A flow of air at 1000 kPa, 300 K is throttled to 500 kPa. What is the irreversibility? What is the drop in flow availability?
asked
Jan 16, 2019
in
Mathematics
by
kratos
thermodynamics
throttle flow
irreversibility
availability
+3
votes
1
answer
Saturated vapor water at 150°C is expanded to a lower pressure with constant temperature. Find the changes in u and *
asked
Jan 12, 2019
in
Mathematics
by
kratos
availability
phase diagrams
thermodynamics
critical points
boundary work
+1
vote
1
answer
Assume both the compressor and the nozzle in Air at 100 kPa, 17°C is compressed to 400 kPa after which it is expanded through a nozzle b
asked
Dec 17, 2018
in
Mathematics
by
kratos
bernoulli
availability
available energy
thermodynamics
reversible work
steady single flow devices
processes multiple devices
reversible shaft work
steady state
+1
vote
1
answer
A window receives 200 W of heat transfer at the inside surface of 20°C and transmits the 200 W from its outside surface at 2°C
asked
Dec 8, 2018
in
Mathematics
by
kratos
thermodynamics
availability
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