Example 1:
Water at 20C (density of 998.2 kg/m3 and
Viscosity of 0.001002 Pa-s) ows from an
open tank through an 80 ft long, 0.5-in
:<=:
. . W t
schedule 40 commermal steel p1pe. The outlet 3 er
is open to the atmosphere. > if
Determine the height that mu
Laminar Flow
> For laminar flow, the shear stress at the pipe wall can be calculated andfis
found to be equal to:
> Not affected by pipe roughness
> Proportional to fluid velocity
> Viscous effects are more important to inertial effects (low Reynolds nu
A heat pump operates according to the vapour compression refrigeration cycle shown in the diagram
below. Water is the working uid and ows at a rate of 5 kg/s. Heat is supplied to the evaporator by
a. hot oil stream at 100C. The oil has a constant specic h
Problem 3 [15 marks]
A. stearn power plant operating on a non-ian Rankine cycle is used to drive an induslr'ial
refrigeration process. The net work output 'on't the Rankine cycle is used to drive the
compressor in the refrigeration cycle. Heat is supplied
Test 2 Solutions
Problem 1:
a) Taking the liquid level in the tank as point 1 and the exit of the pipe as point 2
P2 P1
g z 2 z1
1 2
u 2 u12 0
2
P2 = 0 kPa(g), z = h, and u1 = 0
P1
1
gh u22 0
2
h
1 P1 1 2
( u2 )
g 2
D 2
Eq. (1)
2
1m
4
2
A
1 in
5.0
Example 1
Calculate the pressure of steam at the temperature of 500 C and a
density of 24 kg/m3 using:
a) Ideal gas equation of state
b) The compressibility factor equation of state
c) The SRK equation of state
d) The steam table
a) Ideal gas equation of
Assignment 5
Monday
Due: Thursday, June 12th 2017 by 3:05 pm
Make sure to write your name, B number and assignment number.
Bring your assignment to Mondays lecture.
Problem 1: (10 marks)
The temperature of a house is set to 20C throughout the winter month
MOMENT OF A FORCE (SCALAR FORMULATION),
CROSS PRODUCT, MOMENT OF A FORCE (VECTOR
FORMULATION), & PRINCIPLE OF MOMENTS
Todays Objectives :
Students will be able to:
a) understand and define moment, and In-Class Activities :
b) determine moments of a force
FORCE VECTORS, VECTOR OPERATIONS &
ADDITION COPLANAR FORCES
Todays Objective:
Students will be able to :
a) Resolve a 2-D vector into components.
b) Add 2-D vectors using Cartesian vector notations.
In-Class activities:
Check Homework
Reading Quiz
Appl
SIMPLE TRUSSES, THE METHOD OF JOINTS,
& ZERO-FORCE MEMBERS
Todays Objectives:
Students will be able to:
In-Class Activities:
a)
Check Homework, if any
Define a simple truss.
b)
Determine the forces in members Reading Quiz
of a simple truss.
Applications
EQUILIBRIUM OF A RIGID BODY
&
FREE-BODY DIAGRAMS
Todays Objectives:
Students will be able to:
a) Identify support reactions, and
b) Draw a free-body diagram.
In-Class Activities:
Check Homework
Reading Quiz
Applications
Support Reactions
Free-Body Di
EQUILIBRIUM OF A PARTICLE, THE FREE-BODY
DIAGRAM & COPLANAR FORCE SYSTEMS
Todays Objectives:
Students will be able to :
a) Draw a free-body diagram (FBD),
and,
b) Apply equations of equilibrium to
solve a 2-D problem.
In-Class Activities:
Reading Quiz
A
CENTER OF GRAVITY, CENTER OF MASS,
AND CENTROID OF A BODY
Todays Objective :
Students will:
a) Understand the concepts of
center of gravity, center of mass,
and centroid.
b) Be able to determine the location
of these points for a body.
In-Class Activities
DEFINITION OF MOMENTS OF INERTIA FOR
AREAS, RADIUS OF GYRATION OF AN AREA
Todays Objectives:
Students will be able to:
In-Class Activities:
a) Define the moments of inertia (MoI) Check Homework, if any
for an area.
Reading Quiz
b) Determine the MoI for a
INTERNAL FORCES
Todays Objective:
Students will be able to:
1. Use the method of sections for
determining internal forces in 2-D
load cases.
In-Class Activities:
Check Homework, if any
Reading Quiz
Applications
Types of Internal Forces
Steps for Dete
Question 1
Determine the magnitude of the resultant force acting
on the plate and its direction, measured counter
clockwise from the positive x axis.
Question 2
Question 3
Question 4
CHAPTER 1
MECHANICS, UNITS, NUMERICAL CALCULATIONS &
GENERAL PROCEDURE FOR ANALYSIS
Todays Objectives:
Students will be able to:
a) Explain mechanics / statics.
b) Work with two types of units.
c) Round the final answer appropriately.
d) Apply problem-sol
DALHOUSIE UNIVERSITY
Faculty of Engineering
ENGI 1203 Statics
Assignment 1 - Solution - Vector Forces - Due at the end of the tutorial session
2.58
2.76
DALHOUSIE UNIVERSITY
Faculty of Engineering
ENGI 1203 Statics
Assignment 2 Solution - Equilibrium of a Particle - Due at the end of the tutorial session
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
Fall 2016
Assignment 8 SOLUTIONS
TOTAL MARKS:
Problem 1
/ 20
[4 marks]
Take Point 1 as the liquid level in the tank (P1 = 200000 Pa, u1 = 0) and Point 2 as the pipe outlet
(P2 = 0). The Bernoulli equation between thes
ENGI 2102: Thermo-Fluid Engineering I
Fall 2016
Assignment 6 SOLUTIONS
TOTAL MARKS:
Problem 1
/ 20
[7 marks]
q = 30 kJ/kg
(kg/s)
10 MPa (100 bar)
550C
60 m/s
14 cm
Turbine
(kg/s)
30 kPa (0.3 bar)
550C
42 cm
(kW)
a) The volumetric flow rate can be solved f
ENGI 2102: Thermo-Fluid Engineering I
Fall 2016
Assignment 4 SOLUTIONS
TOTAL MARKS:
Problem 1
/ 30
[8 marks]
From Table B.1 for ethylene, R = 0.2964 kJ/(kgK), Tc = 282.34 K, Pc = 5.041 MPa, = 0.0862
kJ
100 kg 0.2964
52 273.15 K
kg K
mRT
a) V
2.41 m3
ENGI 2102: Thermo-Fluid Engineering I
Fall 2016
Assignment 7 SOLUTIONS
TOTAL MARKS:
Problem 1
/ 30
[4 marks]
In both cases, we must calculate s for the system and s for the surroundings. If the process is
reversible, the sum of these two changes must be z
ENGI 2102: Thermo-Fluid Engineering I
Fall 2016
Assignment 5 SOLUTIONS
TOTAL MARKS:
Problem 1
a)
/ 20
[10 marks]
P
2
3
1
State
P (kPa)
v (m3/kg)
T (K)
1
200
v1
303.15
2
800
v2
303.15
3
800
v3
T3
b) For an ideal gas undergoing an isothermal compression,
U1