EGR 334 Thermodynamics - 3 credits
Instructor: Clark Merkel
Office: Science Hall 234
Email: clark.merkel@loras.edu
webpage: http://myweb.loras.edu/cm418218
Spring 2012
Phone: office: 563-588-7186
home: 563-513-6896
Meets: MWF from 2:00 to 2:50 p.m. in Science 118 MWF
Text: Moran and Shapiro, Fundamentals of Engineering Thermodynamics, 7th ed., Wiley
Office Hrs: TBA
Course Catalog Description: The laws of thermodynamics. Topics include: properties of substances and phase
equilibrium, the first and second laws of thermodynamics, entropy, power cycles and refrigeration cycles.
Prerequisites: Chemistry for Engineers (CHE 111 or 114 ), Engineering Dynamics (EGR 232), and Analytic
Geometry and Calculus III (MAT 260); or by instructor permission.
Objectives: The purpose of this course is to provide an introduction to the principles of thermodynamics. Each
student should learn the laws of thermodynamics and how to use these principles when analyzing engineering
problems. The class will also cover the analysis techniques of heat cycles, the use of psychometrics, and an
introduction to combustion.
Topics covered: First law of Thermodynamics; Property evaluation; Second Law of Thermodynamics; Entropy;
Heat cycles (Carnot, Otto, Diesel, Brayton); Psychrometrics; Combustion
Exams: There will be two exams during the semester, each worth one-half of the exam portion of your grade. You
will be allowed one 8 x 10 inch piece of paper and a calculator during the exam. A missed exam will receive a grade of
zero unless I have received prior notification of an excused absence.
Final Exam: There will be a comprehensive final exam. A missed final exam will receive a grade of zero.
Homework: There will be multiple written homework assignments. Homework is due at the beginning of class, and
late homework will not be accepted. Your lowest homework score will be thrown out. You may talk to and work with
others on the homework, but you must turn in your own solutions.
Grading:
The weighting that will be used to determine the course grade is shown in the following table:
Homework/Quizzes.........……….........30%
Exams…………………..………….....40%
Final Examination……………………25%
Paper…………………………………..5%
Academic Dishonesty
Dishonesty (cheating, plagiarism, claiming another students work as your own) in class and/or assigned work will
result in total loss of credit for the class and/or assigned work. Dishonesty in examinations, which are not final
examinations, will result in total loss of credit for the examination. Dishonesty in final examinations will result in a
failing grade for the course. All cases of student dishonesty will be reported in writing to the associate vice president
for academic affairs by the faculty member. The student may appeal cases of dishonesty to the associate vice president
for academic affairs.
Attendance:
If you miss more than eight classes during the semester, you will receive a failing grade for the course.
Learning Disabilities
If you have a learning disability, please contact the LD Center to make an appointment with a staff member to
determine appropriate and reasonable accommodations. I will be happy to work with you and the center to make the
learning and testing procedures used in this course as optimal as possible for you to succeed.
Date
Reading Assignment
Lecture Topics
Porblems
1/30
2/1
FRI 2/3
MON 2/6
WED 2/8
FRI 2/10
MON 2/13
WED 2/15
FRI 2/17
MON 2/20
Chap 1
Chap 2.1-2.3
Chap 2.4-2.5
Chap. 2.6
Chap 3.1-3.5
Chap 3.6-3.8
Chap 3.9
Chap 3.10-3.11
Chap 3.12-3.14
Introduction, Review of Units
Work and Energy
Heat and the Energy Balance
Energy Analysis of Cycles
Review Chap 2 Problems
State Properties
Enthalpy and Internal Energy
Specific Heats
Generalized Compressibility
Ideal Gas Model
Chap 3.15
Polytropic Processes
2/24
2/27
WED 2/29
FRI 3/2
MON 3/5
WED 3/7
FRI 3/9
MON 3/12
WED 3/14
FRI 3/16
MON 3/19
WED 3/21
FRI 3/23
MON 3/26
Chap 4.1-4.3
Chap 4.4-4.5
Control Volumes
CV Conservation of Mass and Energy
Exam 1: Chapters 1-3
Fall Free Day*** no class
CV Devices and Applications
CV and System Analysis
Review Chap 4 Problems
The 2nd Law of Thermodynamics
2nd Law Applications
Carnot Cycle
Entropy
Entropy in Closed Systems
Entropy for Control Volumes
Isentropic Processes
Chap 1: 19, 37, 51, 59
Chap 2: 6, 20, 24, 32
Chap 2: 49, 53,61, 68
Chap 2: 73, 76, 84, 90
Chap 2: 46, 59, 82,97
Chap 3: 5, 7, 10, 29
Chap 3: 35, 41, 42, 45
Chap 3: 49, 55,68, 78
Chap 3: 92, 93, 96, 99
Chap 3: 102, 107,115,
125
Chap 3: 138,
142,144,147
Chap 4: 1, 6,11, 22
Chap 4: 25,28, 31, 34
3/28
3/30
MON 4/2
WED 4/4
FRI 4/6
MON 4/9
WED 4/11
FRI 4/13
MON 4/16
WED 4/18
FRI 4/20
MON 4/23
WED 4/25
FRI 4/27
MON 4/30
WED 5/2
FRI 5/4
MON 5/7
WED 5/9
FRI 5/11
TBA
Chap 8.1-8.2
Chap 8.3-8.4
MON
WED
WED
2/22
FRI
MON
WED
FRI
Chap 4.6-4.9
Chap 4.10-4.12
Chap 5.1-5.3
Chap 5.4-5.9
Chap 5.10-5.11
Chap 6.1 - 6.5
Chap 6.6-6.8
Chap 6.9-6.10
Chap 6.11-6.13
Chap 9.1-9.2
Chap 9.3- 9.4
Chap 9.5-9.6
Chap 9.7-9.8
Chap 10.1-10.4
Chap 10.5-10.7
Chap 12.1 - 12.4
Chap 12.5-12.7
Chap 12.8
Chap 12.9
Chap 13.1
Chap 13.2-12.3
Chap 13.4
Final Exam:
Rankine Cycle
Rankine Cycle Add ons
Review Chap 8 Problems
Exam 2
Easter Break******* no class
Easter Break******* no class
Internal Combustion and Otto Cycle.
Diesel and Dual Cycles
Gas Turbine and Brayton Cycle
Regeneration
Refrigeration Systems
Heat Pump and Gas Refrigeration
Ideal Gas Mixtures
Psychrometric Applications
Air Conditioning Systems
Cooling Towers
Introduction to Combustion
Combustion and Energy Balance
Fuel Cells
Review for Final Exam
Chap 4: 43, 52, 66, 75
Chap 4: 95, 98, 102,
Chap 4: 94, 100, 106
Chap 5: 3, 6, 17, 20
Chap 5: 35,40,43, 56
Chap 5: 64, 79, 81,86
Chap 6: 1,11,21,28
Chap 6: 36, 38, 59, 66
Chap 6: 80, 86, 91, 111
Chap 6: 114, 124,
151,164
Chap 8: 2,7,13,17
Chap 8: 21,29, 49, 60
Paper
Chap 9: 1, 3, 11, 14
Chap 9: 17, 20, 24, 38
Chap 9: 42,47, 55,58
Chap 9: 59, 63, 77,80
Chap 10: 2, 4, 9, 21
Chap 10: 34, 39, 43, 48
Chap 12: 4, 10, 22, 28
Chap 12: 46,51, 55, 67
Chap 12: 75, 7882, 92
Chap 12: 103, 106, 107
Chap 13: 1, 6, 10, 21
Chap 13: 46, 51, 54,63
Chap 13: 76, 87
Guidelines for Homework:
1. The procedure and format to be followed in solving problems are illustrated on the attached
sheet. Engineering work that is illegible and sloppy is of no value to others who have to use it.
Therefore, neatness and systematic solution of problems is an essential trait of good engineering
work.
2. System and Control Volume diagrams should be drawn and properly labeled. They represent
graphical equations of the problem. Equally important is writing down the standard equation or
starting principle from which the problem is developed. Both the diagrams and the developed
equations will be reviewed when a problem, quiz, or test is graded.
3. Each credit of academic work is generally considered to mean one hour of class per week and at
least two hours of study per hour of class. In other words, you should allow at least a total of 6
hours (possibly more) of outside work each week to be successful in this course.
4. Problem solving format:
a) Homework problems should only be presented using one side of each sheet.
b) Every sheet should have the individual’s name, course number, and a problem number at the
top of the sheet.
c) Each problem should be completed on its own sheet. Don’t put more than one problem on a
sheet. If a problem requires more than one sheet, successive sheets should also be labeled.
d) Every problem should be solved in the following format.
Problem Statement: A complete statement of the problem should be
given at the start of the problem solution.
Known: A summary of the given information is stated
Find: A statement of what is wished to be found by the work
Starting Principle(s): Identify the starting principle from which the
work will be developed.
Solution: Diagrams—clear and labeled
Equations and calculations
Numerical accuracy—how many figures?
Answer: Clearly identified with proper units and acceptable numerical accuracy.
Comments: State any comments about the answer and whether it seems reasonable
and consistent with known information.
EME231
9/6/2007
1/4
I. M. Student
Problem Statement:
An electric motor draws a current of 10 amp with a voltage of 110 V. The output shaft develops
a torque of 10.2 N-m and a rotational speed of 1000 rpm. For operation at steady state,
determine each in kW.
a) the electric power required.
10.2
N-m
b) the power developed by the output shaft.
10 A@110V
c) the rate of heat transfer.
--------------------------------------------------------------1000 rpm
Solution:
a) Electric power is given by
P=IV
In this case the input current: I = 10 A
the input voltage: V = 110 V.
therefore the input power is
P = I V = (10A) (110V) = 1100 W
b) Rotational Mechanical Power is given by
P=Tω
where the Torque is: T = 10.2 N-m
and the rotational speed: ω = 1000 rpm
therefore the output power is
P=Tω
= (10.2 N-m)( 1000 rev/min)(2π rad/1 rev)(1min/60s)
= 1068 N-m/s = 1068 W
c) Using the rate form of the energy balance equation:
dE
 Q W
dt
where for a steady state system:
Q
ΔE
W
dE
0
dt
Work done by system due to electrical work and mechanical shaft work:
W  Wout  Win
 Wmech  Welec  1068 W  1100 W  32 W
Therefore:
Q W 
dE
= -32 W
dt
note that Q is positive for heat flow into the system. So in this case the system has a heat
flow rate of 32 W out of the system.
Summary:
a) Work in: 1100 W
b) Work out: 1068 W
c) Heat Flow Rate: 32 W from the motor to the environment