rlzStfullZl[ [.1-i.ll Ad -i$rlr.iAilt i'
l+lL
University of Technology - Electromechanical Engineering Dept.
Final Exam - Sample No.( ) - 2012-2013
*.
^rd .blectlo
Ulass: J'mechanics/ Systems & Power
Time: 3 hours
Date: I
Subject: Eng. & Numerical Analysis
Examiner: Dr. Mustapha S. Abdullateef
/2013
Note: Answer
@
questions
only
Signature:
t-t-
Q!l: ll4Marksl
a)
Solve the following system of equations using Gauss-Jacobi method
5x
z -- 70
-y *
2x+4y -12
x+y*52=-!
:
Start the solution with (2, 3, 0), for three iterations only.
b) Show that
Il
= ,li,by
the relation
:
P(m,n) =
I(m) + r(n)
f(m+n)
t-t-
lQ!J: llaMarksl
@.tponential
x
1
2
v
1.0
1.2
curve of the form
1.8
y = ebx to the following data:
4
5
2.5
3.6
6
4.7
7
6.6
8
9.1
b) Evaluate one of the following:
i) ff ,,/i * e-G dx.
ii)
t-t-
lQ!l:
-t
_
' ,/tan?
de.
/)
lo"
ltl uarrsl
a)
Use Newton-Raphson method to find the root of the ex
4x.which is
approximately 2 times, correct to three place.s of decimals.
=
b) Solve by the Euler's modified
for .r = O. OZ by taking Ir :
withy-lwhenr=0.
method the following differentiar equation
0. 01 given:
-*= x' -f Y;
t-\
-._-Tum over l-\
I a, pue, | ,r4
I
ll4 Marksl
For the following ODE:
Q{:
dzv dv
3xtuz+i;-y:o
(i) Classify the equation,
and then refer to available method to solve it.
(ii)Determine the indicial equation and recurrence formula if it could solve by
Frobenius method.
(iii)Find the general solution of the given ODE.
@'
lx4Ma'k'l
A tank is discharging water through an orifice at a depth x (m) below the surface
of water whose area A (m').The following are the values of the corresponding
values of A w.r.t x:
x{m\
1.5
1.65
1.8
1.257 1.39 t.52
Using the formula:
t.95
1.65
2.10
1.809
2.55
2.70
1.962 2.t23 2.295 2.462
2.25
2.40
3.00
2.650 2.827
2.85
3.0
(0.018)T
IA
- L_
f.t !'
dx;
Calculate T (sec) for the level of water to drop from (1.5m) to (3.0m) by:
Trapezoidal rule.
Compare the results with exact solution by relative percentage error(RPE).
i.
ii.
t-t-
QS: llaMaikil
The curved surface of a rod of length I is perfectly insulated against the flow of
heat. If both ends of the rod are maintained at temperature of 0"C, and if the initial
temperature distribution in the rod is given by:
f(x)=l
O<x<I
(i) Express the temperature formula as a function of x and t.
(ii)Find the temperature of the rod at x - ; and t - 0.
|
Notethatc - 1
University of Technology
Electro Mechanical Eng.Dept.
rst attempt
Class: 3'd year
Date:
Subject:- Control System theory
Time: 3 hrs
Lectureri Dr.Sabah A.allwatar
Notei Answer 5
!f,!
Classify and solve
the
jr(t) + 3' (0
ell
D.E. given by :-
+y(D = 8u(t); y(0) = !(0) = a
Derive the transfer function of a field controlled D.C. motor defined by t;(s)/V(s) ,
comment on
!\!
-
it's nature
.
rind the transfer function C(s)/R(s) for the system shown below :-
R(s)
llf
C(s)
A unity feedback system
(a) Find
with
tp , Mp , T and t,
6
(s) =
s(s+e)'
.
(b) Find the steady state error if
R(s) =
!
(c) Does the 9)'5tem have satisfactory response
el!
?
Construct the root locus plot for the system given by
c1s.l =
!l[
Q.s onlv
K(S+l)
ffi
rS+2)
; H(s) = ffi
; then find the range of (K) for stable operation
Construct the Nyquist plot for the system whose
Stability of the system
c(s)H(s) =
.
;then test the
"-ii"
.
(Equally distributed marks)
University of Technology-Electromechanical Engineering Dept
Final Exam-First Attempt-2012-2013
Class: 3d Year
Time: 3 hours
Subject: Digital Systems
Date:..2013
Examiner:
4sbft ,-il6 L91 7t"'4t ..t 7. i
Note: answer
ID No.
Ql: a) l)raw the logic diagram and logic
5
|
tle s
t;"'t
s
Signature
circuit for a 4- bit Multiplexer and Denulitiplexer.
b) Determine state of Data Line circuit in part (a) ifthe data input is (01l0) and selector switch is
(10).
have two IC 4- bit magnitude digital comparator ( type 7485) . Connect together ICs to
implement circuit which indicates (3110) is smaller than (3118). Write all details on the circuit.
Q2: Ifyou
Q3: Design Synchronous (Parallel) Counter, which has the following
sequence (9,8, 4,5, 3, 2,0 )
by using D_F.F.
Q4: Determine the counter sequence (waveform) to the circuit in following figure. Start at initial (000)
Q5: Sketch 5-bit Parallel Input Serial Output Shift Register( PISOSR). Explain by drawing output
waveform for writing and reading operation. Assume Data is (l l01l).
Q6: Ifyou want to convert Analog input voltage to Digital output voltage and you don't care too much
for accuracy . which A./D C will you design to choice it. Suppose the digital output voltage Is
represented (3-bit).
Good luck
i*i12,!^tF4lt L,\sia r.\i -{$y'ciAlt i'aliJt
University of Technology - Electromechanical Engineering Dept.
Final Exam -Sample e,- 2012-2013
Time: 3 hours
Study: System Branch:
Subject: Vibration
Examiner: Dr. Saf'aa Hashim
Date: I
Note
12013
:Alswer fourquestionson ly
Si
ame:
Ql ) A body of mass 5 Kg is suspended from a spring of stiffrress 1750 N/m.
The
100N-s/m
.
The
body is
motion of this body is opposed by a viscous resistance of
acted upon by a force of 50 Cosrot N, whose frequency co may be varied .
Determine (a) the frequency of the applied force for the amplitude of motion to be
a maximum, (b)the amplitude of this maximum motion,(c) the amplitude at
resonance condition . (15 marks)
Q2 ) Determine the fundamental frequency of the s),^stem shown fig(1) for lateral
vibration using the deflection curve W(x): Ct@q-)'- (x/L)'l by Rayleigh
approximation method. ( I 5marks)
Q3 ) For the two degree of freedom system shown in fig(2) , determine the
frequency equation, and frequencies . (15 marks)
Q4 ) A mass hanged by a spring fiom its upper end and vibrate freely with a
period of 0.5 second. When system damped it is observed to the its sixth
amplitude being half of the first . If now the upper end is given a harmonic motion
of period of 2 second and amplitude of 10 mm. Find the amplitude at steady
state. (15marks)
Q5 ) For the single degree of freedom system shown in fig(3 a,b,c) determine the
equation of motion then the frequency,
frE9Lvh
\-*r
<:'-
-.'.
- /'.
\,-''
I
;.t i,:r Z;
-1U: 1,l
{1'
i
-?2'
t
-
University of Technolory-Electromechanical Engineering
Dept.
Final Rram-
nt
Class : First
Subject: Engineering Materials
Examiner : Dr, Khansaa Dawood
-
2O12-2O1?
Time : 3 hours
Date: I
12013
Note:
Name:
ID No.
Signature
Note: Answer four
Ql:
To define cooling curves of many alloys of Bi-sb.we obtain the following results:
%sb
0
20
40
60
T2cC)
271
271
400
28s
490
320
550
370
rtfc)
80
600
450
100
631
631
For the alloy containing 60oh Bi:
l. Draw the cooling curve.
2. Calculate the weight percentage of the phases at 420oC, and draw the
microstructure of this alloy.
3. Calculate the weight of solid: weight of liquid of this alloy.
(lSdegree)
Q2: Correct the following sentencesl
1. Ionic bonding is directional bonding.
2. Prealite consists of austenite and cementite.
3. Transition metals form mixed bonds that comprise ionic bonds and
Vander
Waals bonds involving their 3p_electrones.
4. Advantages of polymers are: high density, strong, hard and opaque to light, high
Electrical conductiyity.
5. Primary requirement of Biomaterials is that they must be strong and resist to
corroslon.
(l5degree)
Q3: what are the types of heat treatment? Explain briefly about annealing and their
AIso what the effect of the stages on mechanical
properties.
stages.
(lSdegree)
Q4: Complete the following sentences:
l. An advantages ofcast iron are
2. Examples of semiconductors material --3. Mass of electron equal to ---------, while the charge of it equal to----------.
4. Impurity point defects are found in solid solution of which there are two types _
5. Vickers number
fi ) is calculated
by the formula-
(l5degree)
Q5: Explain briefly about:
1.
Twining.
2. Quenching of steel.
3. Eutectoid.
4. Interstitial solid solution,
5. Ionic bonding.
(15degree)
University of Technologr-Electromechrnical Engineering Dept.
Final Examination (2012-2013)
Class: I " ltar
Subject: Basic of Electrical Engineering
Examiner: Dr. Sameir Abd At-khalik Aziez
ID
Time. 3 hours
Date: I I 2Ol3
Note. Answer only 5 questions
No
Sisnature:
QI)
A. ) A coil of copper wire has a resistance of (36 O) at (29 "C). Find
its resistance at (75'C) & at (-15 "C)?
B. ) In the figure below. find the crrrent in the (9 mV) source.
i2KO
5
r,A';
gmv ,-'
a'**l
l'
Q.2) In the figure shown below, given that (V
a tr"*l
:24
v), find (E)?
16 c)
Q.3) For the following circuit diagrarn, find
in the resistance @)?
power hansfer
Q.4) For the following circuit diagram.
Ir.Vc. Pi,
P.F.r?
if
:
[e(t)
R2 = 1c
99 sin(wt
- 20) ], find;
c
t. I
e{O
--
)<r-.an
Rs=6o
*'l'
;x"
=e
n
Q.5) A small industrial plant has (12 KW) heating load and (25 KVA)
inductive load due to bank of induction motors. The heating elements are
considered pwely resistive (P.F.=l), and the induction motor have a
laeCllrrg P.F. of (0.7). If the supply is (1200 V) at (60 FIz), detennine the
capacitive element required to raise the power factor to (0.98)?
1
tta*xl
Q6)
A)
The load taken from a supply consists of:
1) Lamp load of (12 KW) at unity power factor.
2) Motor load of (?0 KVA) at (0.7) lagging power factor.
3) Motor load of (50 KVA) at (0.8) leading power factor.
Calculate the total load taken from the supply in (KW) and (KVA) and
the power factor of the combined load?
a;M;A
B)
An Iron ring of circular cross section area of (3 cm2) and mean
diameter of (20 cm) is wound with (500 tum) of wire and carries a current
of (2 A) to produce the magretic flux of (0.5 mWb) in the ring.
Deterrnine the perrneability of the
material?
(Good Luck)
a-;n;A
Class:
University of Technology - Electromechanical Engineering Dept.
Final Exam Sample No(2) - 2012-2013
Ith Year
Time: 3 hr
Subject: Computer Science
Examiner: Lect .Abdul Kareem Kasim
Lect. Murooi Nadhom M.Ali
Date:
Note: Answer Six Questions onl1,
IDNo
Name:
Si
Ql:(A) Write a program to input the monthly income(X) by using Input Box
, then print
the income level(Y) in Message Box function, as shown in the following table:
x
Monthly income
Income level
Y
Greater than 500
250-500
Less than 250
Rich
Medium
Poor
(5)marks
@) Write a program to find the N Factorial ( N! ) , whereas
N!= I x 2 x
3
:
x ..........xN
Using " Do........Loop While " statement for soiution.
(5)marks
Q2(A): Write a program to find & print the value of ( S ) ftom the following equation:
5Err
s=tt'-"
/La L/ f -f..,
, f
t-t r-t I
(5)marks
@): Write a program to solve the following equation, foR (2S)values of R ( radius
Ofcircle. Using InputBox to enter R , and print the result on the TextBox.
Area:n
R2
Cir= 2nR
ifR>5
ifR<5
(5)marks
Q3:For the logical circuit shown below:
I- Draw the flow chart to perform the function (G) ofthe circuit
2- Write the outputs for all input probabilities.
A
g
c
(5)marks
(B): Using the InputBox to enter the value ofx. then displal'the ( Error ) on
Message Box if the value of X is negative u'ith three options
(Abort,Retry,Cancel) on Message Box, otherwise(X is positive or equal to zero)
display ( OK ) on Message Box.
(5) marks
Q4:(A) Write a program to find the average of numbers tha dividable by3 (without
remainder) from 3 to 99. Using For...Next statement for solution.
(5) marks
(B): Write a progmm to classify any entered number according to its sign and display
the phrase (negative number) when the number is negative and the phrase
(positive number) when the number is positive, otherwise display the phrase
(neither positive nor negative).
(5)marks
Q5(A): Write a program
as
following:
1- Form Load event to change the back color
ofthe Form
ofX from the equation:
2- Commandl Click event to calculate the value
X=A^2+2*B+60 ifA & B:10
X:A12-B^2+30
otherwise
then display the result (X) on the Text Box, Using InputBox to enter
the value of A & B.
3- Command2 click event to terminate the program.
(5)marks
(B): Write a program to enter the elements values ofthe one dimensional array
A(6) by using the InputBox, then display array 8(6) which is the inverse of
4(6)'
(5)marks
Q6(A): Draw a flow chart
axz
to find the roots of the following
equation:
+bx+c=0
usins the formula as
:
L.L
xt,z =
(7)marks
za
(B):What is the function and the parts of CPU.
(3)marks
Q7(A): . 1- What is the difference between source program & object program?
2- What is the advantage of interpreter compared to compiler?
3- What is the advantage of Machine Language'r
(5)marks
(B): Write a program to print (welcome) ten times, the first one with the
ordinary size and color. Then make the color changed and the size bigger at
each time.
(5)marks
University of Technology
Electromechanical Engineering Dept.
Final Exam -Sample No(2)
Time: 3 Hours
Class: First Year
Subject: Mathematics
Examiner: Dr. Ghada Adel
M.Sc. Karema Assi
fl?/2013
NOTE:W
Date:
EACH BRANCH HAVE
ignatwe
a.
i+2j-k.
If you havethreevectorsinspaceT=i-i+2k.E=Zi+i+t and c=
show that (?xE\"e =G.ilE-<E.7lA .
b.
Solve only two branches from the following:
1. Find the distance between the point (2,1) and the line y-x=2.
2. Plotthe polarcurve r=5+3cosd in the range 0<0 <2tt.
3. Find the solution ss1 61 4.log ro Jt = log to (6 - x)
Q2/ Solve only two branches from the following:
a. Find the domain and the range then draw the funcfions
(r)y-t-x
(2) y=s+(x+zf
iv
b.Find $using implicit differentiation
dx
' -l2!.et^nn x = x.sinh-'(x+y)
if
[*2......*r rl
c. Sketch the function "f(x) ='l
[2.......x<lJ
f ,Is the
Q3/
a.
:
Solve the system of linear equations using
function continuous at x = I
gillgg Gramer's rule
q
.
Inverse matrix
X=1+2Y
2X+3Y+Z=7
22=8+X
b. Prove that sinh(x+y)=sinhx coshy *s6s[a sinhy
Q4l
t,
4x2
.
+9x+8
a.
Evaluate
l, . ^. . + 1)"
-,, asc
o (x + 2)(x
,.
,17t-S+4i
and Zz-2+iare two complex numbers
using De Moivre's theorem find
(Z
,)r
' find Zr. rr, +z^''J Z ,
,
,
and by
.
,u:r
Page
I of2
bS/ Sol". only two branches from the following:
' x)'ex
a. tf J'- (sin
,nsin
-l
find i ,r" *
rim @+h)3 -x3
.
b. Find h-+o
1,
*
d* .
c. Evaluate '3csc
[
"tt
x-2cot x
'1'
.
Q6/ Solve only @ branches from the following:
a. Evaluate J(*t - 2x2 + 3x + l).(sin 2x)dx
b. Evaluate '4xo+4x+2
[ ^*fu
c. Evaluate Jtan 3 x. sec 3 xdr
GOOD LUCK
Page 2 of 2
University of Technology-Electromechanical Engineering
Dept.
Final Exam-First Attempt _ 201 2_201 3
Class :
2nd year - systems
Subject: Electronics
Examiner : Ass. Prof. Khalooq yaseen
Name:
Time : 3 hours
Date: I
12013
Note: Attempt four questions
iD No.
onJv
Signature
Ql)
a) Find a relationship between c and p in a transistor.
b) Find the value of il for the circuit shown io fig.i. rnitf, y
qs=24y,Rc=
Rr= 270O, a silicon transistor is used with g=4i, and Vca=
10KO,
5V. -
(SMarks)
(2gMark)
Q2) For the circuit shown in.Fig2. A T-equivarent circuit of a common
base transistor
Is used with r"'= 10Q, rrt,':100Q, r".= lMf,), c.:g00pF,
c" =9pF, oo:0.9g
Find the frequency at which the common emiiter current
gain equal to unity. (25Mark)
Q3)
a) What is meant by Crossover Distortion.
U) .l^ gJ3gs-an_gower amplifier circuit has
a load resistance R1= gO, with a power
of 4w, for v66= 30v, Determine the highest collector
current rbr this circuit.
(5Mark)
(20Mark)
Q4) An amplifier circuit shown in Fig.3. is drawn without biasing
circuit.
Derive the approximate total voliage gain at low frequencies,
by using its
Equivalent circuit.
(2SMark)
Q5) Use one operafional amnJiner,ll in Fig.4. to verify the tbllowing
equation:
Vo=5Vr+3V2
(25Mark)
P(c Li
F'3.t+
University of Technology - Elcclromcchanical Engiueering Department
Final Examination (201 2-2013
'lin c: 3 Hours
Class: Second
Subject: Strength of Materials
No1.:: Answer Five Questions Only
Examiner : Ass.Prof.Dr.Muhannad Zedan Khlefia
Ql: A uniform T-section beam is 100 mm wide and i50 mm deep with a flange
thickness of 25 mm and a web thickness of 12 m,n. If the limiting bending
stresses for the material of the beam are 80 M \/m2 in compression and
160 MN/mz in tension, find the maximum u.d.l. th:l l the beam can carrv over
a simply supported span of 5 m.
Q2: (a)
A steel transmission shaft is 510 mm long anr 50 mm external diameter.
For part of its length it is bored to a diameter of 25 m ir and for the rest to 3g mm
diameter. Find the maximum power that may be transmitted at a speed of
210 rev/min if the shear stress is not to exceed 70 MNr,n2.
(b) If the angle of twist in the length of 25 mm bore i equal to that in the length
of38 mm bore, find the length bored to the latter dranreter.
Under certain loading conditions the stresses in th : walls of a cylinder are as
follows:
(a) 80 MN/m2 tensile (in X-direction)t
(b) 30 MN/m2 tensile ar right angles to (a);
(c) shear stresses of 60 MN/m'on the planes on which th9 stresses (a) and (b) act;
the shear couple acting on planes carrying the 30 MNr m2 stress is clockwise in
effect
calculate the principal stresses and the planes on r hich they act. what would
-be the
effect on these results if owing to a chan.le of loading (a) becomes
compressive while stresses (b) and (c) remain uncha rged, and find solutions bv
Mohr's circle ?
Q3;
,
Q4:
A beam ABC is 9 m long and supported at B an,i C,6 m apart as shown in
Figure (l). The beam carries a triangurar disiribution of road over the
portion BC together with an applied countercliickwise couple of moment
80 kN m at B and a uniform distributed load (u.d.l.) of l0 k]r{/m over AB, as
shown. Draw the S.F. and B.M. diagrams for the iream.
Figure(l)
Q5: A-Explain the torsion theory.
B- Explain Relationship between loading, shear force, bending moment, slope
and deflection.
Q6: A power transmission cable consists of ten copper wires each of 1.6 mm
diameter surrounding three steel wires each of 3 :nm diameter. Determine the
combined E for the compound cable and hence determine the extension ofa 30 m
length of the cable when^it is being laid with a tension of 2 kN.
For steel, E = 200 GN/m2; for copper, E = 100 GN/rn2.
University of Technology-Electromechanical Engineering Dept.
Final Exam 2012-2013
Time: 3 hours
Class:2ni
Subject: Electrical Machine
Examiner:Dr.Shereen Faik,Dr.AbdulJabbar O* aid
Date:
Note:
Signature
Name:
Note : Answer only five questions. (60 mark)
Ql. (a). For shunt DC generator draw :
l. The equivalent circuit. 2. The open circuit characteristics'
(6 marks)
3. The external characteristics.
(!lfo. Separately - Excited DC motor draw:
l.The equivalent circuit.
3. N/[" characteristics.
2.
T/I" characteristics.
(6 marks)
A 4 pole, long shunt, compound generator supplies 100A, at a
terminat voltage of 500V. [f the armature resistance is 0.02 O , series
field resistance is 0.04 0 and shunt field resistance 100 O. Find the
9L
generated e.m.f. Take drop per brush as
lV. Neglect armature reaction'
(12 marks)
dc series motor takes 40A at220Y and runs at 800 r.p.m. If the
armature and field resistances are 0.2 f,) and 0.1 () respectively and the
iron and friction losses are 0.5KW, find the torque developed in the
(12 marks)
armature and the output of the motor.
03. I
04. (a).
Draw the connection of three phase transformer which is
(3 marks)
used in industrial application.
(!).-fn" efficiency of a 200KVA , single phase transformer is 987o
when operating at full load 0.8 tagging p.f. the iron losses in the
transformer is 2000 W. Calculate : (1) Full load copper losses.
(2) Half load copper losses.
(9 marks)
(3) Efliciency half load.
Q5.
a 3- phase
500 V, 50H2, Induction motor with 6 poles develops
20 hp. at 950 RPM with a power factor of 0.86. The mechanical losses
total (1 hp). Calculate for this load (a) the slip (b) the rotor copper
losses, (c) the input ifthe stator losses total 1500W (d) the line current.
(12 marks)
50 Ha 8- pole Induction motor has a full- load slip 4%o. The
rotor resistance and reactance are 0.01 0' and 0.1 O per phase
respectively. Find the ratio of the maximum to full load torque and the
speed at which the maximum torque occurs.
(12 marks)
Q6.
-,q.
Good Luck
University of technology-Electromechanical Engineering Dept'
Final Examinati on 2012-2013
Iine: Three hours
Class: Fourth Year
Examiner: Dr. Mahmoud.
M.M
Date:72-6-2013
first question including'
\g,!gi Answer on 4 questions only to be the
gg Choot. the correct answer with necessitv validation'
(15 Degree)
l- A standard vapour compression cycle using refrigerant R-134a. if the evaporating
the compressor
temperature is i-to"c; and the condensing temperature is(40"c),
discharge temperature ls:
a-
c-53oC
b- 44'C
61oC
of
2- A rvest -facing wall (type F) of a building with overall heat transfer coefficient
(0.356) at40o north latitude on July. Ifthe inside temperature is 25"C and the average
daily temperature is 30oC, the peak heat gain through the wall is :
c- 8'5 wm2
b-12.1
u-zi.l
3- A moist air with( 35"c) DBT and (20%) relative humidity is to be cooled sensibly to
(15"C) , the final wet bulb temperature is:
c- 14.1"C
b-1 1.50C
a- 10.6"C
wm2
wt^'
at point A
02: An air duct system is provided as shown in the figure. The standard air enters
with a static pressure of 7.5mm of water.
and
Using friction chart and equal pressure drop method, determine the correct diameter
Consider
velocity in lengths AB, BC, CD branch BE, branch EH, branch EG and branch CF'
(15 Degree)
friction losses only.
120m3/min
1oom3/mln
2oom3/min
140m3/min
liquid to
heat exchanger warms saturated vapor coming from the
03: A vapour compression refrigeration
suction heat exchanger.
The
system using refrigerant R22 includes a
from the condenser at 30oC' the compressions'
evaporator from -10 to 5oC with liquid comes
are isentropic in both cases listed below'
without the heat exchanger'
a- calculate the coefflcient of performance of the system
with the heat exchanger'
b- calculate the coefficient of performance of the system
c-Ifthecompressoriscapableofpumpingl0.5Llsmeasuredatthecompressorsuction,
whatistherefrigerationcapacityofthesystemwithouttheheatexchanger?
capacity of the system as in (c), what is the compressor
d- with the same refrigeration
caDacrrv
(15 Degree)
i
north latitude on July
colnput. the total heat gain for the south wall of a building at 320
frarne (the wall most nearly
21. The time is 4 p.M. sun time. The wall is brick veneer and
of 0.33 wm2oc ' The wall is 2'5 by
matches type F) with an overall heat transfer coefficient
glass with a 13mm air space' The
5rn with a l-by 2mwindow. The window is regular double
of 0'45' The indoor design
glass and inside draperies have a combined shading coeffrcient
ql,
is 37"C'
temperature is 25oC , and the outdoor daily average temperature
EThefollowingdatareferstosummerairconditioningofabuilding:
-
(15 Degree)
Inside design conditions: 24oC DBT and 50% RH'
0C
WBT'
Outside design conditions: 40'CDBT and30
Room sensible heat gain 27.8 kW
Room latentheat gain 11.1 kW
The condition of air leaving the coil is at | 8oC
cooling coil'
60% of the retum air is recalculated and mixed with 40Yo of outside air after the
Sketch all processes on the sychrometric chart and determine :
a- The condition of air entering the building'
b- The amount of outside air .
cd-
Apparatus dew Point (ADP).
By- pass factor of the cooling coil.
Conditioned
space
24'C
50Yo
Good Luck
i>u t *)
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