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DALHOUSIE UNIVERSITY
Faculty of Engineering
NAME:
GRADE
STUDENT ID
ENGI 2102
Thermo-fluid Engineering I
Instructors: Drs. Michael Pegg, P.Eng. and Jan Haelssig
Wednesday 16 November 2011
17:30-19:30
Sexton Memorial Gym
TEST No. 2: Version B
This i

ENGI 2102 Thermo-Fluid Engineering I
Chapter 1: Introduction to the Mechanics and
Thermodynamics of Fluids
Michele Hastie
Process Engineering and Applied Science
Dalhousie University
Fall 2016
Outline
1.1 Systems and Control Volumes
1.2 Properties of a Sy

A final point is that the molecular interpretation of heat
and work elucidates one aspect of the rise of civilization.
Fire preceded the harnessing of fuels to achieve work. The
heat of fire the tumbling of out of energy as the chaotic
motion of atoms is

ENGI 2102 Thermo-Fluid Engineering I
Chapter 5: The First Law of Thermodynamics
for Non-Flow Processes
Michele Hastie
Process Engineering and Applied Science
Dalhousie University
Fall 2016
Outline
5.1 Introduction
5.2 Specific Heats
5.3 Non-Flow Processes

ENGI 2102 Thermo-Fluid Engineering I
Chapter 3: Work and Heat
Michele Hastie
Process Engineering and Applied Science
Dalhousie University
Fall 2016
Outline
3.1 Forms of Energy
3.2 Energy Transfer
3.3 Mechanical Forms of Work
3.1.1 Internal Energy
3.1.2 Ki

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Chapter 6: Flow Processes 124
Example 6.1: The gure below shows a siphon draining a tank of water. Apply Bernoullis
equation between points 1 and 3 to determine the exit velocity. Then apply Bernoullis
equation between points 1 and 2 to ob

Thermodynamics is a funny subject. The first time you go
through it, you don't understand it at all. The second time
you go through it, you think you understand it, except for
one or two small points. The third time you go through it,
you know you don't u

PART I SHORT-ANSWER QUESTIONS
Answer the following questions in the space provided.
Problem 1 [6 marks total]
a) A lidless cup of hot water cools on the counter by transferring heat to the surroundings. [2 marks]
i) Is this a closed, open or isolated syst

Problem 1 [6 marks total]
Calculate the temperature of steam at a pressure of 75 bar and a density of 20 kg/m3 using:
i) The ideal gas law. [1.5 marks]
ii) The compressibility factor equation of state. [3 marks]
iii) The steam table. [1.5 marks]
Problem 2

4.3 The Ideal Gas Equation of State
An equation of state (EOS) gives a relationship between
temperature, pressure and volume (or specific volume) of a
substance.
The simplest equation available to predict the P-v-T behaviour
of a gas is the Ideal Gas EOS:

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A basketball (0.6 kg and 24 cm diameter) is floating at the surface of the water (w = 998 kg/m3) in a swimming
pool.
a) What percentage of the balls volume will be underwater? (8.3%)
b) You pull the ball underwater and hold it such that it is 5 m below th

ENGI 2102: Thermo-Fluid Engineering I
Fall 2016
Equations (Chapter 5)
For all closed systems:
U = Q W = m(q w)
W PdV m Pdv
= q w
w Pdv
Ideal Gas
Pv = RT
= cv(T2 T1)
cv = cp R
h = cp(T2 T1)
P2 v2 P1v1
1 n
q w u
is obtained from steam tables
P v Pv
T T
w

ENGI 2102 Thermo-Fluid Engineering I
Chapter 5: The First Law of Thermodynamics
for Non-Flow Processes (Part 2)
Michele Hastie
Process Engineering and Applied Science
Dalhousie University
Fall 2016
5.4 Power Cycles
Heat engines are devices designed to pro

ENGI 2102 Thermo-Fluid Engineering I
Chapter 4: Thermodynamic Properties of Fluids
Michele Hastie
Process Engineering and Applied Science
Dalhousie University
Fall 2016
Outline
4.1 The P-v-T Surface
4.1.1. The P-v Diagram
4.1.2. The T-v Diagram
4.1.3. The

ENGI 2102: Thermo-Fluid Engineering I
Question
Fall 2014
Mark
Possible
Marks
1
8
2
3
3
6
4
10
5
8
Total
35
Problem 1 Multiple Choice and Short Answer/Calculation
[8 marks]
1. When does the ideal gas law give good predictions of gas behaviour?
a.
b.
c.
d.

ENGI 2102: Thermo-Fluid Engineering I
Fall 2014
Assignment 5 SOLUTIONS
Problem 1
[5 marks]
R = 0.2968 kJ kg-1 K-1
Tcr = 126.200 K
Table B.1, for nitrogen:
a) v
Pcr = 3.400 MPa = 3400 kPa
1
0.0086957 m 3 /kg
3
115 kg/m
T
b) Pr
Pv
R
kJ
kg kPa m3
146.

ENGI 2102: Thermo-Fluid Engineering I
Fall 2015
Assignment 5
Due: Thursday, October 22nd, 2015 by 2 pm
Bring your assignment to the lecture or lab F106 between 1 and 2 pm
Problem 1
[4 marks]
A piston-cylinder device contains a fixed amount of air initiall

ENGI 2102: Thermo-Fluid Engineering I
Fall 2015
Assignment 7
Due: Tuesday, November 3rd, 2015 by 12 noon
Bring your assignment to the lecture or office D403 before 12 noon
Problem 1
[4 marks]
[Chapter 5, Problem 5]
A rigid tank contains 1 kg of air at 300

ENGI 2102: Thermo-Fluid Engineering I
Fall 2015
Assignment 6
Due: Friday, October 30th, 2015 by 2 pm
Bring your assignment to Thursdays lecture, office D403,
or lab F106 on Friday between 1 and 2 pm
Problem 1
[10 marks]
Consider the following cyclic proce

ENGI 2102: Thermo-Fluid Engineering I
Fall 2015
Assignment 8
Due: Friday, November 20th, 2015 by 1:30 pm
Bring your assignment to Thursdays lecture or office F105B Friday before 1:30 pm
Problem 1
[6 marks]
In the system shown in the diagram, 10 kg/s of ai

ENGI 2102: Thermo-Fluid Engineering I
Fall 2015
Assignment 9
Due: Tuesday, December 1st, 2015 by 2:30 pm
Bring your assignment to Tuesdays lecture or office F105B before 2:30 pm
Problem 1
[7 marks]
A piston/cylinder device contains 3 kg of air initially a