Influencing policy (training slides from Fast Track Impact)
[PHY103] Introduction to General Physics for Engineering Students 1/2013
1. “Vectors. Adding and multiplying vectors. Systems of
particles and Newton's 2nd Law. Linear momentum.
Center of mass. Conservation of angular momentum.
Systems with varying mass. Collisions in 1D and 2D.
Rotation of rigid body. Rolling, torque, and angular
momentum. Fluid mechanics. Simple harmonic oscillations.
Wave propagation. Sound waves. Heat. Entropy.The 1st and
2nd laws of thermodynamics. Kinetic theory of gasses.”
Course Description
--- quoted from physics curriculum (2009)
PHY 103 Physics for Engineering Students (3-0-6)
ดร.วรวรงค์ รักเรืองเดช
ดร.อัฐพล กลั่นบุศย์
ภาควิชาฟิสิกส์ คณะวิทยาศาสตร์ มจธ.
วิชาฟิสิกส์พื้นฐานสำหรับนักศึกษาวิศวกรรมศาสตร์ (เครื่องกล)
Teaching and
Research Team
+
‘Total of 200 Students’
‘Small groups of 5’
2 Instructors:
•Worawarong R.
•Uttapol K.
4 Facilitators:
• Kachanon N. (LI)
• Banyat L. (LI)
• Marut P. (LI)
• Tossaporn L. (Ph.D. student)
Teaching and
Research Team 1 Grader
• Nantarat
SCL 2109
Studio Lab: CB24XX
learning space (ME?)
outside the classroom
space
e-learning
Physics Book
High-School Physics
Motion
Types
translation
2D
projectile
circular
Simple Harmonic
Oscillator (SHO)
1Dlinear
3D
Rotation
Oscillations
Relevant
Quantities
position &
displacement (~x)
speed &
velocity (~v)
acceleration (~a)
time (t)
tools
graphing
calculus
"rate of change"
Laws
Newton's Laws
1st law
v = const,
if F = 0
2nd law
F = ma
Force (F)
Total Force
equillibrium
collisions
Friction
mass (m)
acceleration (a)
T = I*a
Torque & Moment
การบิด
การดัด
Moment of Inertia (I)
angular acceleration
3rd law action = reaction
choosing relevant force
Gravitational
Law of Newton
F = Gm1m2/r^2
Body
Rigid Bodies
Fluids
(Force) Field
Energy
Heat
Electric and Magnetic
Radiation and Nuclear Energy
Types
Fusion
Fission
E = mc^2
nuclear
reaction
applications
power plants
radioactive
substances
types
properties
sources
environmental
impacts
Waves
mechanicalv = lambda * f
Sound
sound
pollution
Phenomena
beats
standing waves
doppler
shock waves
resonances
Hearing
sound quality
pitch
intensity /
sound level
sources
properties
parameters
Electromagnetic Light
geometrical
reflection
mirrors
planar
spherical
refraction
Snell's law
index of
refraction
total internal
reflection (TIR)
apperant depth
lens
concave
convex
physical interference
diffraction
gratingscattering
spectrum
color
seeing
matter waves
Heuygen principles
Typespotential
kinetic
work
rate of doing work
= power
Essentials
Quantities
SI
Units
Mathematics Calculus
derivatives
integrals
Table and Graphing
Vector
Adding
Multiplying
Problem Analysis
Free-Body Diagram
Main ConceptPhysics = Quantitative Science
Measurement
accuracy
uncertainty
significant
figures
Comparison
Ideas
Mass balance
*** Electricity
and magnetism
Electrical & Magnetic
Components
Capacitor
Inductors
Resistance
Battery
Transformer
Devices /
Appliances
Principles
Maxwell's Equations
Charges
Static
Moving
Current
Electromagnetic
Waves
Free space In materials
Fields
Electric
Magnetic
***Quantum Mechanics
Failure of classical physics
Planck Hypothesis
Duality of LightPhotoelectric effect
Quantum Computer
Atoms
Lorentz Model"Spring-like"
Bohr Atom
Quantized energy
spectrum
Quantum Model
Schrodinger Equation
Wavefunctions
Uncertainty
Principle
Probabilistics
High-School Physics
Motion
Types
translation
2D
projectile
circular
Simple Harmonic
Oscillator (SHO)
1Dlinear
3D
Rotation
Oscillations
Relevant
Quantities
position &
displacement (~x)
speed &
velocity (~v)
acceleration (~a)
time (t)
tools
graphing
calculus
"rate of change"
Laws
Newton's Laws
1st law
v = const,
if F = 0
2nd law
F = ma
Force (F)
Total Force
equillibrium
collisions
Friction
mass (m)
acceleration (a)
T = I*a
Torque & Moment
การบิด
การดัด
Moment of Inertia (I)
angular acceleration
3rd law action = reaction
choosing relevant force
Gravitational
Law of Newton
F = Gm1m2/r^2
Body
Rigid Bodies
Fluids
(Force) Field
Energy
Heat
Electric and Magnetic
Radiation and Nuclear Energy
Types
Fusion
Fission
E = mc^2
nuclear
reaction
applications
power plants
radioactive
substances
types
properties
sources
environmental
impacts
Waves
mechanicalv = lambda * f
Sound
sound
pollution
Phenomena
beats
standing waves
doppler
shock waves
resonances
Hearing
sound quality
pitch
intensity /
sound level
sources
properties
parameters
Electromagnetic Light
geometrical
reflection
mirrors
planar
spherical
refraction
Snell's law
index of
refraction
total internal
reflection (TIR)
apperant depth
lens
concave
convex
physical interference
diffraction
gratingscattering
spectrum
color
seeing
matter waves
Heuygen principles
Typespotential
kinetic
work
rate of doing work
= power
Essentials
Quantities
SI
Units
Mathematics Calculus
derivatives
integrals
Table and Graphing
Vector
Adding
Multiplying
Problem Analysis
Free-Body Diagram
Main ConceptPhysics = Quantitative Science
Measurement
accuracy
uncertainty
significant
figures
Comparison
Ideas
Mass balance
*** Electricity
and magnetism
Electrical & Magnetic
Components
Capacitor
Inductors
Resistance
Battery
Transformer
Devices /
Appliances
Principles
Maxwell's Equations
Charges
Static
Moving
Current
Electromagnetic
Waves
Free space In materials
Fields
Electric
Magnetic
***Quantum Mechanics
Failure of classical physics
Planck Hypothesis
Duality of LightPhotoelectric effect
Quantum Computer
Atoms
Lorentz Model"Spring-like"
Bohr Atom
Quantized energy
spectrum
Quantum Model
Schrodinger Equation
Wavefunctions
Uncertainty
Principle
Probabilistics
2. PHY: 103 Topics
Mechanics
Newton's laws
Motion Types of motions
Linear motion
Periodic motion
Simple Harmonic
Circular
Elliptical
Oscillations
Mapping mechanics
with waves
Mechanical Waves
longtitudinal
sound
transverse
string
Angular motion
Description
space & time
position, velocity, acceleration
As a method of nature
laws for making prediction
Force
linear
angular
Body
Rigid
System of
particles
Fluid
Flow
Lamina
Turbulance
Conservation Laws
Momentum
Angular
LinearEnergy
Essential toolsSystem of units
Free body diagram
Physics and quantitative science
Measurement
Comparison
Scaling Laws
Vectors
adding
multiplying
Mathematics
Table and graphs
Calculus
Heat & Thermodynamics
Laws of thermodynamics
0th law
thermal equillibrium
1st law
Conservation of Energy
2nd law
Set Nature's Direction
Basic Quantities
Energy
Heat
Transfer
Conduction
Convection Radiation
Internal Energy
System Work
Temperature
Scales
Specific Heat
Atomic
Levels
Kinetic theory of gases
Gas laws
Statistics
Bulk Properties
*** Electricity
and magnetism
***Quantum Mechanics
Waves Types
Mechanical Waves
Electromagnetic Waves
Light
Matter Waves
Parameters
Frequency / Amplitude / Phase /
Polarization / Propagation direction
สอบกลางภาค
สอบปลายภาค
สอบปลายภาค
wk 1
wk 2
wk 3
wk 4
wk 5
wk 6
wk 7
wk 8
wk 9
wk 9
wk 10
wk 11
wk 12
wk 13
wk 13
wk 14
wk 15
wk 16
wk 17
wk 18
Course Introduction &
Tracker Program
Gaussian cannon
(conservation laws)
Paper bridge
(analysis of structure)
Loaded Hoop
(Newton’s Laws)
Ball Levitation
(Fluid dynamics)
Spinning top
(Rotational Inertia)
A simple pendulum?
(Resonance condition)
Review
physics of musics
(vibrations & sound)
project consultation
project performance
Thermal comfort
(thermodynamics I)
water rise expt.
(kinetic theory of gas)
gasoline vs. diesel
engines (thermo. II)
Review
รศ.ดร.พงษ์พันธุ์ ผศ.ดร.ชวิน
ผศ.ดร.ยศพงษ์
อ.สุทธิพงษ์ / คชานนท์
คณาจารย์วิศวะเครื่องกล
คณาจารย์วิศวะเครื่องกล
(Tentative) Schedule
of PHY103 in 1/56
3. High-School Physics
Motion
Types
translation
2D
projectile
circular
Simple Harmonic
Oscillator (SHO)
1Dlinear
3D
Rotation
Oscillations
Relevant
Quantities
position &
displacement (~x)
speed &
velocity (~v)
acceleration (~a)
time (t)
tools
graphing
calculus
"rate of change"
Laws
Newton's Laws
1st law
v = const,
if F = 0
2nd law
F = ma
Force (F)
Total Force
equillibrium
collisions
Friction
mass (m)
acceleration (a)
T = I*a
Torque & Moment
การบิด
การดัด
Moment of Inertia (I)
angular acceleration
3rd law action = reaction
choosing relevant force
Gravitational
Law of Newton
F = Gm1m2/r^2
Body
Rigid Bodies
Fluids
(Force) Field
Energy
Heat
Electric and Magnetic
Radiation and Nuclear Energy
Types
Fusion
Fission
E = mc^2
nuclear
reaction
applications
power plants
radioactive
substances
types
properties
sources
environmental
impacts
Waves
mechanicalv = lambda * f
Sound
sound
pollution
Phenomena
beats
standing waves
doppler
shock waves
resonances
Hearing
sound quality
pitch
intensity /
sound level
sources
properties
parameters
Electromagnetic Light
geometrical
reflection
mirrors
planar
spherical
refraction
Snell's law
index of
refraction
total internal
reflection (TIR)
apperant depth
lens
concave
convex
physical interference
diffraction
gratingscattering
spectrum
color
seeing
matter waves
Heuygen principles
Typespotential
kinetic
work
rate of doing work
= power
Essentials
Quantities
SI
Units
Mathematics Calculus
derivatives
integrals
Table and Graphing
Vector
Adding
Multiplying
Problem Analysis
Free-Body Diagram
Main ConceptPhysics = Quantitative Science
Measurement
accuracy
uncertainty
significant
figures
Comparison
Ideas
Mass balance
*** Electricity
and magnetism
Electrical & Magnetic
Components
Capacitor
Inductors
Resistance
Battery
Transformer
Devices /
Appliances
Principles
Maxwell's Equations
Charges
Static
Moving
Current
Electromagnetic
Waves
Free space In materials
Fields
Electric
Magnetic
***Quantum Mechanics
Failure of classical physics
Planck Hypothesis
Duality of LightPhotoelectric effect
Quantum Computer
Atoms
Lorentz Model"Spring-like"
Bohr Atom
Quantized energy
spectrum
Quantum Model
Schrodinger Equation
Wavefunctions
Uncertainty
Principle
Probabilistics
Wk 1 (3hr): The core of “physics” ... the quantitative science: measurement and comparison / dimension analysis
Physics is a quantitative
science. Measurement and
comparison are the keys.
Quantity and units are
essential for measurement
and making comparison
Key Concepts
Dimension analysis and modeling
ทบทวนความรูเดิม
(เนื้อหา ม.ปลาย)
2 hr
Going over
course syllabus
Good practice to solve a physics
problem
Key Success
• ชี้แจงรายละเอียดของรายวิชา
• สรางความตระหนักเกี่ยวกับศาสตร
การวัดและการเปรียบเทียบ
(measurement and
comparison)
• ทบทวนกรอบความรูเดิม
(ม.ปลาย)
• เลาเรื่อง dimension analysis
F = ma represents an
equation of motion, which is
the cause of change of
motion.
Wk 2 (3hr): The “Cannon” ... vectors and motions via the Newton’s laws
Key Concepts
Free-body diagram is a
drawing representing external
forces acting on the object of
interest. (dealing with F)
“Monkey gun”
acceleration
of a ball free fall
F = ma from kx
‘projectile’ motion
Key Success
Displacement, velocity,
and acceleration represent
ing “motion” are connected
based on calculus (dealing with a)
Vectors are useful for keeping
tracks of magnitude and direction
of a physical quantity
ใชเครื่องยิงลูกเหล็กแบบโปรเจคไตลเปนตัวเชื่อมโยง
• กฎของนิวตัน (ขอสอง)
• เวกเตอรผานการรวมแรง และการเคลื่อนที่ (x/v/a)
• การสรางโมเดลผานการวาด free-body diagram
และทำการทดสอบพื้นความรูของนักศึกษา (1 hr pre-test)
period of 1 hr:
(16/8/56)
pre-test เนื้อหา
ม.ปลาย
4. Wk 3 (3hr): Analysis of Structure ... the equilibrium of forces and moments
Key Concepts
Equilibrium of rigid body
Condition for zero force and
zero moment of forces.
activity: invent yourself?
Examples/techniques used are
analysis of trusses & method of
joints
1st and 3rd laws of Newton
Key Success
Conservation laws deal with
constant of motion (energy /
momentum / angular momentum)
Wk 4 (3hr):The Gaussian Cannon ....the Conservation Laws: Energy and Linear Momentum.
Key Concepts
Conservation of momentum is
valid when F = 0. It’s useful for
describing collisions
Types of collisions: elastic vs
inelastic collisions. In both cases
momentum and energy are always
conserved
Conservation of energy is always
true. Energy cannot be destroyed
or created. It only change forms. “Gaussian Cannon”
F = ma can be describe as a rate of
change of momentum (i.e. impulse)
• ทบทวน condition of equilibrium and
Newton’s laws of motion
• ทำความเขาใจเกี่ยวกับการเคลื่อนที่ของลูกเหล็กที่
สัมพันธการเปลี่ยนรูปพลังงานของปนพลังแม
เหล็ก... the Gaussian cannon
• conservation laws: energy and linear
momentum
5. understand the basic
principle of a gyroscope
Wk 5 (3hr): Spinning “Top:” .... rotational motion via a gyroscope
Conservation of angular
momentum allows us to keep tracks
of orientation (e.g. gyroscope)
Key Concepts
Parallel axis theorem is useful for
finding moment of inertial at the
pivot displaced from C.O.M.
Moment of inertia is analogy to
mass. It tells the property of the
object and can be calculated by I =
Integrate(r^2dm) Activities
“Gyroscope”
Goal: get a longest precision
time on a spinning top: Design
www.bgfl.org
similarities and differences between
linear and angular motions.
Torque = (Moment of
Inertia)*(angular acceleration)
Parameters to adjust/explore:
•moment of inertia of the disk (mass or length)
•acceleration (torque and angle and time)
•symmetry for stable rotation
Work and Rotational Kinetic Energy
• เชื่อมโยงความคลายคลึงระหวาง linear motion
และ rotational motion
• เขาใจเรื่อง torque, moment of inertia and
angular acceleration
• เขาใจการออกแบบการสราง spinning top ให
หมุนไดเวลานานที่สุด
The$Kine(c$Energy$of$Rolling$
must$take$into$account$both$rota(on$and$transla(on$
1
2
Icom
2 1
2
Mv2
com+ = (K.E.)rolling
rota%onal(kine(c$energy$
due$to$rota(ons$about$
its$center$of$mass$
transla%onal(kine(c$energy$
due$to$transla(on$of$its$
center$of$mass$
Kine(c$Energy$(K.E.)$
of$a$rolling$object$
Wk 6 (3hr): Hydraulic Lever and Ball’s Levitation. ... fluid mechanics
Design of hydraulic lever
Pressure is vary with height and
depth
Pascal principle
Key Concepts
Buoyancy
density
How lift and drag created
in imaginary
stream(pipe)line
basic parameters: density,
pressure, air velocity / profile.
Key Success
Bernoulli’s equation + equation
of continuity.
Laminar vs.Turbulence and
significance of Reynold number.
Pascal’s'Principle'and'the'Hydraulic'Lever'
Considering'the'work'done'by'the'output'piston,'
W = Fodo = Fi
Ao
Ai
⇥
di
Ai
Ao
⇥
= Fidi
Work'done'by'the'output'piston'
in'li=ing'the'load'placed'on'it'
Work'done'on'the'input'
piston'by'the'applied'force'
Hydraulic*Lever*
Pascal’s*Principle:'A'change'in'the'pressure'applied'to'an'enclosed'incompressible'fluid'is'
transmiCed'undiminished'to'every'porDon'of'the'fluid'and'to'the'walls'of'its'container.”'
PhET Simulator
|Fb| = mf g
Buoyancy / lift / drag
Av1 = Av2
This%rela*onship%also%apply%to%any%so0called%tube%of%flow.%%
Any%imaginary%
flow%whose%
boundary%consists%
of%streamlines.%
Volume%flow%rate% Mass%flow%rate%
RV = Av = const. Rm = RV = const.
Equa*on%of%
Con*nuity%
Bernoulli’s+Equa/on+A+principle+of+fluid+flow+based+on+
conserva/on+of+energy+
p +
1
2
v2
+ gy = constant
• (คาบ 2 ชม.) โจทยใหเลน หามุมเอียงที่มากที่สุดที่ทำใหลูก
ปงปองลอยไดดวยเครื่องเปาผม
• (คาบ 1 ชม.) ใชไฮดรอลิกสที่สามารถเห็นไดในอุตสาหกรรม
(air / oil) อนุเคราะหจากเครื่องกล?
Density(
(uniform)density))
=
M
V
= lim
V 0
m
V
=
dm
dV
=
m
V
For) a) small) volume)
∆V),)measuring)a)mass)
∆m,)the)density)is$
For)a)infinitesimal)volume)dV)with)a)mass)
of)dm,)we)define)a)density)
In)a)case)that)a)material)
is) much) larger) than)
atomic)dimensions,))
6. Wk 7: Review of mechanics
Physics is a
quantitative science.
Measurement and
comparison are the
keys. Quantity and
units are essential for
measurement and
making comparison
Dimension analysis and
modeling
Good practice to solve a
physics problem
Key Success
F = ma represents an
equation of motion, which
is the cause of change of
motion.
Free-body diagram is a
drawing representing external
forces acting on the object of
interest. (dealing with F)
Displacement, velocity,
and acceleration represent
ing “motion” are connected
based on calculus (dealing with
a)
Vectors are useful for
keeping tracks of magnitude
and direction of a physical
quantity
Wk 8: Midterm examination
Equilibrium of rigid
body
Condition for zero force
and zero moment of forces.
Examples/techniques used
are analysis of trusses &
method of joints
1st and 3rd laws of Newton
Conservation laws deal with
constant of motion (energy /
momentum / angular momentum)
Conservation of momentum is
valid when F = 0. It’s useful for
describing collisions
Types of collisions: elastic vs
inelastic collisions. In both cases
momentum and energy are always
conserved
Conservation of energy is always
true. Energy cannot be destroyed
or created. It only change forms.
F = ma can be describe as a rate of
change of momentum (i.e. impulse)
Design of hydraulic lever
Pressure is vary with height and
depth
Pascal principle
How lift and drag created
in imaginary
stream(pipe)line
basic parameters: density,
pressure, air velocity / profile.
Bernoulli’s equation + equation
of continuity.
Laminar vs.Turbulence and
significance of Reynold number.
Buoyancy / lift / drag
wk 1 wk 2 wk 3 wk 4 wk 5
ทบทวนความเชื่อมโยงตั้งแตสัปดาหที่ 1 ถึง 5 และเตรียมความพรอมสำหรับการสอบกลางภาค
คำนวณ 50% + ความเขาใจ 50%
understand the basic
principle of a gyroscope
Conservation of angular
momentum allows us to keep tracks
of orientation (e.g. gyroscope)
Parallel axis theorem is useful for
finding moment of inertial at the
pivot displaced from C.O.M.
Moment of inertia is analogy to
mass. It tells the property of the
object and can be calculated by I =
Integrate(r^2dm)
similarities and differences between
linear and angular motions.
Torque = (Moment of
Inertia)*(angular acceleration)
wk 6
Applets
Wk 9 (3hr):What is “Resonance”? ...Different types of Harmonic Motion (linear and angular dynamics)
Key Concepts
The key of “RESONANCE”
phenomena: the matching of natural
frequency and driving frequency.
Resonance
Pendulum
understanding the way to write
“differential equations” for simple
harmonic motion, damped
harmonic motion, and forced
harmonic motion.
the understanding of “natural
frequency” with an example of
(simple?) pendulum
Understanding the limit of a
simple pendulum, i.e. if (1) angle is
small and (2) string is massless.
Physical pendulum is useful for
predicting the motion of a real
pendulum
Activities
parameters:
(1) mass of string
(2) angle of pendulum
(3) mass of the
(4) ความยืดหยุ่นของ pendulum
(5) ....
“Explore the limit of the
Simple Pendulum”
Masses & Springs
Forced Harmonic MotionDamped Harmonic Motion
Important Oscillatory Motion
Amplitude
8
1
ωm
b =
12 2bb =
13 4bb =
0 0.5 1.0 1.5 2.0
ω
ω ""
( )δtωsin
G
F
)t(x m
−""=
(small&damping)&
x =
Fm
G
sin !!! t "!( )
!
G = m2
""# 2
$#2
( )
2
+ b2
""# 2
!
"
#
$
%
& ''
= −
G
bω
δ 1
cos
Simple Harmonic Motion
d2
x
dt2
+
k
m
x = 0
d2
x
dt2
+
b
m
dx
dt
+
k
m
x = 0
d2
x
dt2
+
b
m
dx
dt
+
k
m
x =
Fm
m
cos 00
t
x(t) = xme bt/2m
cos(⇥⇥
t + )
=
k
m
b2
4m2
Etotal =
1
2
kA2 1
2
kx2
me bt/m
Key Success
RESONANCE
• เขาใจวิธีการเขียน diff. eq. ของ
Harmonic motion รูปแบบตางๆ
เริ่มดวย ระบบสปริง-มวล
• เปรียบเทียบระบบ simple
pendulum และ physical
pendulum
• เขาใจ simple harmonic
motion, damped harmonic
motion, and forced harmonic
motion.
• ทดลอง “simple pendulum”
และเขาใจ the approximation
behind และขอบเขตของระบบ
“simple pendulum” เพื่อเขาใจ
natural frequency.
m
มุม
P!h!!!"! c!î!
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7. commons.wikimedia.org
Frequency)of)sound)produced)by)membrane)instruments)
+ - +
+
+-
-
+ +- -+
+
+
+
+ -
-
-
-
-
f1 f2 = 1.59f1 f3 = 2.13f1
f4
= 2.30f1
f5
= 2.65f1
f6
= 2.92f1
Modes)of)drum)(standing)waves))
Node)line)
+)and)=)stand)for)membrane)displacement)(concave)up)or)down))
Wk 10 (3hr): The Sound of Musics ..... mechanical waves (string and musics)
Wave on a string
Sound
Wave Interference
Fourier Making Waves
(optional)
Important parameters of
musical instruments are
sound quality, which depends on
human perception and frequency
mixing of the sound
Key Concepts
PhETsimulator:Applets
types of waves: mechanical vs.
electromagnetic, longitudinal vs
transverse.
Waves property: Superposition
principles leading to simple
calculation of interference and
standing waves.
Standing waves are description
of fixed positions.
Wk 11 (3hr): Musical Instrument project: Do-it-yourself (DIY)
Wk 12 (3hr): Musics performance.The presentation of students’ instrument project.
ปรึกษาหารือ ซักซอม การแสดงกับดนตรีดวยเครื่องดนตรีที่แตละกลุมสรางขึ้นมา
การแสดงดนตรีของนักศึกษา
Guest speakers.. นักดนตรี / อ.สุทธิพงษ (GEN241 ความงดงามแหงชีวิต)?
Revisit the “resonance”
• แยกความแตกตางระหวาง sound intensity,
sound level, sound quality, ear
response.
• แยกแยะความแตกตางระหวางเครื่องดนตรี
ประเภทตางๆ เชน oscillating strings,
membranes, wooden block, air column
(close vs open ends)
8. Wk 13-14 (6 hr): Thermal Comfort (heat + energy + kinetic theory of gas + laws of thermodynamics)
Heat transfer mechanism
Key Concepts
Gas Properties
PV-Diagram: state / process / work
the heat and energy concepts
Thermal Comfort (Y.A. Cengel, Heat and Mass Transfer:A Practical Approach, 3rd Ed., 2006, pp. 40-45)
Heat and other
forms of energy
1st law of
thermodynamics
- specific heat of gases,
liquids and solids
- PV=nRT
- energy transfer
- ∆E = Ein - Eout
- rate forms: d/dt
- ∆U = ∆Q + W
- Heat balances
Heat transfer
mechanism
- conduction:
- dQ/dt = -kA*dT/dx
- atomic motion in gas
liquid and solid
- thermal expansion
- convection
- dQ/dt = hAs(Ts-Tœ)
- radiation
- dQ/dt = c(Ts
4-Tsur
4)
Heat loss
from a person
Introduction to engine mechanism (reading assignment, going to second laws of thermodynamics)
- “state” vs “process”
- Work is area under the curve
- Examples of different types of processes
(adiabatic, isotherm, isobaric)
(optional:iftime’sallowed)
Thermal expansion
keywords:ASHRAE 55-2010
in-class activities (wk 2)
water rise
the 0th and 1st laws of
thermodynamics
state of matters and the
phase diagram
the PV digram
introduction to the heat
engine
plotting the PV diagram of
the ideal gas law.
conduction / convection /
radiation
Wk 15 (3hr): KMUTT Ethanol Bus .... the implication of 2nd Law of Thermodynamics
1. Relevant parameters:
-Internal Energy
-Enthalpy
-Entropy
Key Concepts
2. Heat Engine
•Concept of a heat engine
•Mapping onto a PV Diagram
•Calculate engine efficiency
•Diesel vs gasoline engines
Activities
Equipment: (1) a clip video of
Aj.Yossapong
“How efficient is an ethanol
bus”
Goal: compare the efficient of
ethanol engine used in a bus.
gasoline diesel
CERL: อ.ยศพงษ?