This document discusses reversible and irreversible processes in thermodynamics. It begins by defining reversible processes as processes that can reverse themselves without leaving a trace on the system or surroundings. Reversible processes are idealized and can never be achieved exactly in reality. The Carnot cycle is then introduced as an ideal reversible thermodynamic cycle composed of four processes: two reversible isothermal processes and two reversible adiabatic processes. The Carnot cycle establishes the maximum possible efficiency between two temperature reservoirs. Real engines are always less efficient than the Carnot reversible engine due to irreversible losses. The document provides examples comparing real and reversible processes.
Level Control of Tank System Using PID Controller-A ReviewIJSRD
This paper discusses the review of level control of tank system using PID controller. PID controller use for one or more tank system. PID has fast response. Paper present different methods of level control. Eliminate the steady state error. It is most common way of solving problems of practical control systems.
Level Control of Tank System Using PID Controller-A ReviewIJSRD
This paper discusses the review of level control of tank system using PID controller. PID controller use for one or more tank system. PID has fast response. Paper present different methods of level control. Eliminate the steady state error. It is most common way of solving problems of practical control systems.
To design any air-conditioning unit, estimation of heating or cooling load is very important. It helps us in design different devices most importantly the humidifier (in case of winter) or de-humidifier (in case of summer).
Equivalence of The Kelvin Plank and Clausius Statements | Mechanical EngineeringTransweb Global Inc
The first law of thermodynamics is based on the law of conservation of energy. It states that the cyclic integral of net heat transfer is equal to the cyclic integral of network transfer. Copy the link given below and paste it in new browser window to get more information on Equivalence of The Kelvin Plank and Clausius Statements:- http://www.transtutors.com/homework-help/mechanical-engineering/laws-of-thermodynamics/equivalence-kelvin-plank-statement.aspx
A brief explanation of one of the important topic of thermodynamics involves the concept of carnot cycle. Carnot Cycle describes the working of engines. this presentation involves an introduction of carnot cycle its working and applications in daily life. Efficiency factor is also being meintioned in it.
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This presentation talks about the overview of the equations of state as part of behavior of gases chapter. It has equations about the gas laws and combined gas law. Also includes the ideal gas equations and some practice exercises.
To design any air-conditioning unit, estimation of heating or cooling load is very important. It helps us in design different devices most importantly the humidifier (in case of winter) or de-humidifier (in case of summer).
Equivalence of The Kelvin Plank and Clausius Statements | Mechanical EngineeringTransweb Global Inc
The first law of thermodynamics is based on the law of conservation of energy. It states that the cyclic integral of net heat transfer is equal to the cyclic integral of network transfer. Copy the link given below and paste it in new browser window to get more information on Equivalence of The Kelvin Plank and Clausius Statements:- http://www.transtutors.com/homework-help/mechanical-engineering/laws-of-thermodynamics/equivalence-kelvin-plank-statement.aspx
A brief explanation of one of the important topic of thermodynamics involves the concept of carnot cycle. Carnot Cycle describes the working of engines. this presentation involves an introduction of carnot cycle its working and applications in daily life. Efficiency factor is also being meintioned in it.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
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This presentation talks about the overview of the equations of state as part of behavior of gases chapter. It has equations about the gas laws and combined gas law. Also includes the ideal gas equations and some practice exercises.
These introductory statistics slides will give you a basic understanding of statistics, types of statistics, variable and its types, the levels of measurements, data collection techniques, and types of sampling.
The second law of thermodynamics is explored in this lecture. Topics covered include:
Introduction to the second law
Thermal energy reservoirs
Heat engines
Thermal efficiency
The 2nd law: Kelvin-Planck statement
Refrigerators and heat pumps
Coefficient of performance (COP)
The 2nd law: Clasius statement
Perpetual motion machines
Reversible and irreversible processes
Irreversibility's, Internal and externally reversible processes
The Carnot cycle
The reversed Carnot cycle
The Carnot principles
The thermodynamic temperature scale
The Carnot heat engine
The quality of energy
The Carnot refrigerator and heat pump
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4. How did Louis Vuitton enter into the Japanese market originally? What were the other entry strategies it adopted later to strengthen its presence?
5. Will Louis Vuitton have any new challenges arise due to the global financial crisis? How does it overcome the new challenges?Assignment 3
1. What has made Louis Vuitton's business model successful in the Japanese luxury market?
2. What are the opportunities and challenges for Louis Vuitton in Japan?
3. What are the specifics of the Japanese fashion luxury market?
4. How did Louis Vuitton enter into the Japanese market originally? What were the other entry strategies it adopted later to strengthen its presence?
5. Will Louis Vuitton have any new challenges arise due to the global financial crisis? How does it overcome the new challenges?Assignment 3
1. What has made Louis Vuitton's business model successful in the Japanese luxury market?
2. What are the opportunities and challenges for Louis Vuitton in Japan?
3. What are the specifics of the Japanese fashion luxury market?
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5. Will Louis Vuitton have any new challenges arise due to the global financial crisis? How does it overcome the new challenges?
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2. 2
Reversible Processes
The second law of thermodynamics state that no
heat engine can have an efficiency of 100%.
Then one may ask, what is the highest efficiency
that a heat engine can possibly have.
Before we answer this question, we need to
define an idealized process first, which is called
the reversible process.
The processes discussed earlier occurred in a
certain direction. They can not reverse
themselves irreversible processes.
3. 3
Reversible Processes
A reversible process is defined as a process that
can be reversed without leaving any trace on
either system or surroundings.
This is possible if the net of heat and net work
exchange between the system and the
surrounding is zero for the combined process
(original and reverse).
Quasi-
equilibrium
expansion or
compression
of a gas
4. 4
Reversible processes actually do not occur
in nature.
They are simply idealization of actual
processes.
Reversible processes can never be
achieved.
You may be wondering, then, why we are
bothering with such fictitious processes:
1. Easy to analyze
2. Serve as idealized model
5. 5
Engineers are interested in reversible processes
because:
when Reversible processes are approximated
instead of the Actual ones
1. Work-producing devices such as car engine and
gas or steam turbine deliver the most work, and
2. Work-consuming devices such as compressors,
fan, and pumps consume the least work.
6. 6
Reversible processes can be viewed as
theoretical limits for the corresponding not
reversible ones.
We may never be able to have a reversible
process, but we may certainly approach it.
The more closely we approximate a reversible
process, the more work delivered by a work-
producing device or the less work required by
a work-consuming device.
Processes that are not reversible are called
Irreversible processes.
9. 9
Cycles that are composed of reversible
processes will give the maximum net
work and consumes the minimum work.
One of these cycles is the
Carnot Cycle.
Named for French engineer Nicolas Sadi
Carnot (1769-1832)
It is composed of four processes as
follows:
10. 10
Process 1-2: A reversible
isothermal expansion
The gas is allowed
to expand
isothermally by
receiving heat ( QH)
from a hot
reservoir.
11. 11
Process 2-3: A reversible adiabatic
expansion
The cylinder now is
insulated and the gas
is allowed to expand
adiabatically and thus
doing work on the
surrounding.
The gas temperature
decreases from TH to
TL.
12. 12
Process 3-4: A reversible
isothermal compression
The insulation is
removed and the
gas is compressed
isothermally by
rejecting heat (QL)
to a cold reservoir.
13. 13
Process 4-1: A reversible
adiabatic compression
The cylinder is
insulated again
and the gas is
compressed
adiabatically to
state 1, raising its
temperature from
TL to TH
14. 14
Net work done by Carnot cycle is the
area enclosed by all process
The Carnot
cycle is the
most efficient
cycle
operation
between two
specified
temperatures
limits.
16. 16
Reversed Carnot Cycle
Process 2-3: The gas
expands isothermally at
TL while receiving QL
from the cold reservoir.
Process 3-4: The gas
is compressed
adiabatically raising its
temperature to TH.
Process 4-1: The gas
is compressed
isothermally by
rejecting QH to the hot
reservoir.
Process 1-2: The gas expands adiabatically (throttling
valve) reducing its temp from TH to TL.
18. 18
Carnot principles
1. No heat engine is more
efficient than a reversible
one operating between
the same two reservoirs.
2. The thermal efficiencies
of all reversible heat
engines operating
between the same two
reservoirs are the same.
Low temperature reservoir at TL
19. 19
The Thermodynamic Temperature Scale
A temperature scale that is
independent of the properties of the
substances that are used to measure
temperature is called a
thermodynamic temperature scale.
That is the Kelvin scale, and the
temperatures on this scale are called
absolute temperatures.
L
H
revL
H
T
T
Q
Q
cyclesreversibleForThe second Carnot principle state
that the thermal efficiencies of all
reversible heat engines operating
between the same two reservoirs
are the same.
hth, rev = f (TH,TL)
20. 20
Efficiency of a Carnot Engine
For a reversible cycle the amount of heat
transferred is proportional to the temperature
of the reservoir.
H
L
rev
Q
Q
1h
H
L
T
T
1
Only true for the
reversible case
21. 21
COP of a Reversible Heat Pump and a
Reversible Refrigerator
HL
revHP
QQ
COP
1
1
,
HL TT
1
1
1
1
,
LH
revR
QQ
COP
1
1
LH TT
Only true
for the
reversible
case
22. 22
How do Reversible Carnot Heat Engine
compare with real engines?
engineheatimpossible
engineheatreversible
engineheatleirreversib
rev,th
rev,th
rev,th
th
h
h
h
h
thermal
h thh
engineheatimpossible
engineheatreversible
engineheatleirreversib
rev,th
rev,th
rev,th
th
h
h
h
h
24. 24
COP of Carnot Heat PumpCOP of real Heat Pump
H
L
HP
Q
Q
COP
1
1
H
L
rev,HP
T
T
COP
1
1
PumpHeatimpossibleCOP
PumpHeatreversibleCOP
PumpHeatleirreversibCOP
COP
rev,HP
rev,HP
rev,HP
HP
How do Carnot Heat Pump compare with
real one?
25. 25
How to increase the efficiency of a real heat
engine?
H
L
rev,th
H
L
th
T
T
Q
Q
1
1
h
h
1- Increase TH but you are limited with melting
temperature of the engine material.
2- Decrease TL but you are limited with your
environment.
26. 6.6. Equivalence of Ideal-Gas
and Thermodynamic
Temperature
Scales
Lecture Notes
26
27. 27
Example (5-8): Heating a House
by a Carnot Heat Pump
A heat pump is to be used to heat
a house during the winter, as
shown in the figure at right. The
house is to be maintained at 21oC
at all times. The house is
estimated to be losing heat at a
rate of 135,000 kJ/h when the
outside temperature drops to -
5oC. Determine the minimum
power required to drive this heat
pump.
Sol: