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Recent questions tagged reversible processes
+2
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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
+2
votes
1
answer
A counter flowing heat exchanger has one line with 2 kg/* at 125 kPa, 1000 K entering and the air is leaving at 100 kPa, 400 K. The other line has
asked
Mar 27, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
steady state
+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
Saturated water vapor at 20 psia is compressed to 60 psia in a reversible adiabatic process. Find the change in v and T.
asked
Mar 16, 2019
in
Mathematics
by
kratos
bernoulli
thermodynamics
bernoulli equation
reversible processes
polytropic processes
reversible shaft work
steady state
+2
votes
1
answer
An air compressor has a significant heat transfer out. for how high T becomes if no heat transfer. Is that good or should it be insulated?
asked
Mar 15, 2019
in
Mathematics
by
kratos
bernoulli
thermodynamics
reversible processes
device efficiency
processes multiple devices
reversible shaft work
steady state
+2
votes
1
answer
In a heat-powered refrigerator, a turbine is used to drive the compressor using the same working fluid. Consider the combination
asked
Mar 14, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
steady single flow devices
processes multiple devices
steady state
+1
vote
1
answer
Water at 100 kPa, 150°C receives 75 kJ/kg in a reversible process by heat transfer. Which process changes * the most:
asked
Mar 13, 2019
in
Mathematics
by
kratos
available energy
thermodynamics
reversible processes
reversible work
polytropic processes
steady state
+1
vote
1
answer
Saturated water vapor at 200 kPa is compressed to 600 kPa in a reversible adiabatic process. Find the new v and T.
asked
Mar 12, 2019
in
Mathematics
by
kratos
bernoulli
thermodynamics
reversible processes
bernoulli equation
reversible shaft work
steady state
+3
votes
1
answer
R-134a at 90 F, 125 psia is throttled so it becomes cold at 10 F. What is exit P?
asked
Mar 11, 2019
in
Mathematics
by
kratos
thermodynamics
throttle flow
reversible processes
steady state
+3
votes
1
answer
Consider the design of a nozzle in which nitrogen gas flowing in a pipe at 500 kPa, 200°C, and at a velocity of 10 m/*, is to be expanded
asked
Mar 10, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
steady state
+2
votes
1
answer
Air in a rigid 1 m^3 box is at 300 K, 200 kPa. It is heated to 600 K by heat transfer from a reversible heat pump that receives energy
asked
Mar 7, 2019
in
Mathematics
by
kratos
carnot cycles
thermodynamics
reversible processes
entropy of ideal gases
available energy
reversible work
polytropic processes
steady state
+3
votes
1
answer
Calculate the second law efficiency of the coflowing heat exchanger has one line with 0.25 kg/* oxygen at 17°C, 200 kPa entering
asked
Feb 22, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
law efficiency
steady state
+2
votes
1
answer
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,
asked
Feb 20, 2019
in
Mathematics
by
kratos
carnot cycles
thermodynamics
reversible processes
law efficiency
steady state
+3
votes
1
answer
A drag force on a car, with frontal area A = 2 m^2, driving at 80 km/h in air at 20°C is Fd = 0.225 A ρairV^2.
asked
Feb 18, 2019
in
Class 9
by
kratos
force displacement work
thermodynamics
reversible processes
class-9
linear equations in two variables
steady state
+1
vote
1
answer
R-134a at 30°C, 800 kPa is throttled so it becomes cold at –10°C. What is exit P?
asked
Feb 9, 2019
in
Mathematics
by
kratos
thermodynamics
throttle flow
reversible processes
steady state
+1
vote
1
answer
A brass boiler has a base of 0.15 m^2 and thickness 1.0 cm. If boils water at the rate of 6.0 kg/min when placed on a gas stove.
asked
Feb 5, 2019
in
Class 11
by
kratos
thermal properties of matter
transfer of heat
class-11
thermodynamics
reversible processes
steady state
+1
vote
1
answer
A heat exchanger that follows a compressor receives 0.1 kg/* air at 1000 kPa, 500 K and cools it in a constant pressure process to 320 K.
asked
Feb 1, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
steady state
+2
votes
1
answer
A compressor receives air at 290 K, 100 kPa and a shaft work of 5.5 kW from a gasoline engine. It should deliver a mass flow rate of 0.01 kg/*
asked
Jan 19, 2019
in
Mathematics
by
kratos
thermodynamics
reversible processes
steady state
+3
votes
1
answer
An automobile engine develops 100 kw when rotating at a speed of 1800 r.p.m. what torque does it deliver ?
asked
Jan 1, 2019
in
JEE
by
kratos
rotational motion
jee
thermodynamics
reversible processes
rotational mechanics
jee mains
steady state
+3
votes
1
answer
A heat engine receives 1 kW heat transfer at 1000 K and gives out 600 W as work with the rest as heat transfer to the ambient.
asked
Dec 30, 2018
in
Mathematics
by
kratos
available energy
thermodynamics
reversible processes
inequality of clausius
reversible work
steady state
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