103344283 final-year-project2012-ee

42
Project Report
On
DIALUX BASED INTERIOR LIGHTING
DESIGN AND MATLAB
COMPUTATION
Project Report Submitted in partial fulfillment of the requirements for the
degree of Bachelor of Technology from West Bengal University of
Technology
By
Pranab Biswas Roll No - 08176016023
Kartik Samanta Roll No - 08176016043
Rahul Biswas Roll No - 08176016057
Dipankar Roy Roll No - 08176016046
Under the Guidance of
Prof.- Ms. Deblina Sabui
(Assistant Professor, Dept of E.E)
Department of Electrical Engineering.
Hooghly Engineering & Technology College
Hooghly, West Bengal
2011-2012

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Certificate of Recommendation
It is hereby recommended to consider the project report entitled
“ DIALUX BASED INTERIOR LIGHTING DESIGN AND MATLAB
COMPUTATION’’
submitted by
for partial fulfillment of the requirements for the award of the
degree of Bachelor of Technology in Electrical Engineering from
West Bengal University of Technology.
--------------------- ---------------------------------
Prof. Ms. Deblina Sabui Prof. D. M. Kar
(Assistant Professor ) ( Head of the Department )
Project Guide
(i

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Certificate of Approval
It is hereby approved the project report entitled "( DIALUX BASED
INTERIOR LIGHTING DESIGN AND MATLAB COMPUTATION’’)" submitted
by
for partial fulfillment of the requirements for the award of the
degree of Bachelor of Technology in Electrical Engineering from
West Bengal University Of Technology.
Board of Examiners
---------------------------
-----------------------------

42
-------------------------------
(ii)
Contents
CHAPTER NO. TOPIC PAGE NUMBER
1 Definition
2 Case Study One
3 Case Study One
4 Case study three

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5 Matlab Computation
(iii)
List of the Figure
.

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List of the Tables
SERIAL
NO.
TOPIC PAGE
NUMBER
1 RELATION BETWEEN DIFFERENT LIGHTING
PARAMETERS
2 INVERSE SQUARE LAW
3 LUMEN METHOD OF LIGHT CALCULATION
4 SPACE: HEIGHT RATIO (SHR)
5 DIALux Light Wizard
6 DIALux 4.4 project [WORKSTATION 3D ]
8 DIALux 4.4 project [FLOOR PLANE VIEW ]
9 Luminaire diagram
10
11
12
isolux plot
mountaing plot

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1. OFFICE WORK PLACE AREA / Photometric Results
2. OFFICE CONFERANCE ROOM/Photometric Results
ACKNOWLEDGEMENT

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We would like to articulate our deep gratitude to our project guide Ms. Deblina Sabui
who has always been source of motivation and firm support for carrying out the
project. We express our gratitude to Prof D. M. Kar, Professor and Head of the
Department, Electrical Engineering for his invaluable suggestion and constant
encouragement all through the work.
We would also like to convey our sincerest gratitude and indebtedness to all other faculty
members and staff of Department of Electrical Engineering , HETC, who bestowed their
great effort and guidance at appropriate times without which it would have been
difficult on our project work.
An assemblage of this nature could never have been attempted with our reference to and
inspiration from the works of others whose details are mentioned on reference section.
We acknowledge our indebtedness to all of them. Further, we would like to express our
feeling towards our parents and God who directly or indirectly encourage and motivated
us during this dissertation.
Abstract

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The Project investigates the energy efficient technology as an artificial lighting source for
office buildings. Light is a form of Electromagnetic energy radiated from a body which is
capable of being perceived by the human eye. The sensation of light result from a flow of
energy into the eye and the light will appear to vary if the rate of this flow of energy
varies.
An effective strategy to reduce the lighting power density in offices while maintaining
high quality lighting can have huge energy savings potential for commercial office space.
Task/ Ambient light optimizes lighting power density through a reduction in overhead
lighting level supplemented by bringing personal task light to the workspace.
A lighting system based on uniformly placed CFL, T5 are in a ceiling is designed with
respect to requirements for lighting comfort on the workplaces in typical office buildings.
Now a days it is possible to model rooms with luminaires and accommodated with
daylight calculations by Lighting software and simulate the illuminance behavior.
Furthermore controlling strategies with automatic switches sensors, timer, etc are
implemented, which make it possible to calculate the efficiency of the lighting planning
design. The controlling strategies in Light Calc are made with focus on individual control
to obtain three set goals. First equally distributed illuminance in the room, then high
illuminance in the work places and lower surroundings illuminance finally daylight
control.
All strategies are implemented and tested by simulations in an office model. All
luminaire are controlled individually and the solution of optimized via a wanted
illuminance value. Result show that by applying individual light control saves energy,
especially when combined with daylight.
After obtaining the complete model and programming of lighting design in the 3D
system. The model is simulated using MATLAB.

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Introduction
In this thesis modern lighting technology is investigated to provide artificial lighting in
office buildings. This is done in order to achieve lower energy consumption, good light
distribution and color rendering along with individual control for the best possible
lighting scenarios for each desired task. Here this new technology is used to design a
better solution than conventional artificial lighting especially due to the longer life time
of T5s and lower annual costs in electricity. The lighting system is designed to represent
the required standards and comfort level of office work environment along with
individual control to gain the best possible office environment with uniformly placed T5s
in the ceiling. The idea is to control the output level in an energy efficient way, such as
keeping a desired light level at the work stations while regulating the rest down to a
minimum. Therefore a system with individual control unit each lamp is needed.
Implementing this design gives the benefit of creating a complete system with individual
control of the lamps by controlling the desired light level with and without daylight
present. In this thesis the lighting system is implemented by means of simulations in the
MATLAB program and designed by DIALUX. In additions to the program so that the
photometric data from a lamp can be imported and a mathematical model of combined
daylight and T5 illumination can be calculated with the controlling strategy mentioned
above. This method is a valuable tool in designing and running light installations with
energy saving as a main goal. This solution can be recommended as an energy effective
combination with the new T5 technology, Individual control and daylight.

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Chapter 1
Definitions
LUMEN :
Luminous flux or luminous power is the measure of the power of light source. It differs
from radiant flux, the measure of the total power of light emitted, in that luminous flux is
adjusted to reflect the varying sensitivity of the human eye to different wavelengths of
light. The unit of luminous flux is the lumen (lm). One lumen is defined as the luminous
flux of light produced by a light source that emits one candela of luminous intensity over
a solid angle of one steradian. In other systems of units, luminous flux may have units of
power.
LUMINOUS INTENSITY:
Luminous intensity is a measure of the wavelength-weighted power emitted by a light
source in a particular direction per unit solid angle, based on the luminosity function, a
standardized model of the sensitivity of the human eye. The SI unit of luminous intensity
is the candela (cd), an SI base unit.
ILLUMINANCE:
Illuminance is the total luminous flux incident on a surface, per unit area. It is a
measure of the intensity of the incident light, wavelength-weighted by the luminosity
function to correlate with human brightness perception. Similarly, luminous emittance is
the luminous flux per unit area emitted from a surface. Luminous emittance is also
known as luminous existence.
In SI derived units these are measured in lux (lx) or lumens per square metre (cd·sr·m−2
).
In the CGS system, the unit of illuminance is the photo, which is equal to 10,000 lux. The
foot-candle is a non-metric unit of illuminance that is used in photography.
Illuminance was formerly often called brightness, but this leads to confusion with other
uses of the word. "Brightness" should never be used for quantitative description, but only
for no quantitative references to physiological sensations and perceptions of light.
LUMINANCE:
Luminance is a photometric measure of the luminous intensity per unit area of light
travelling in a given direction. It describes the amount of light that passes through or is
emitted from a particular area, and falls within a given solid angle. The SI unit for

42
Definitions
luminance is candela per square metre (cd/m2
). A non-SI term for the same unit is the
"nit". The CGS unit of luminance is the stilb, which is equal to one candela per square
centimeter or 10 kcd/m2
.
RELATION BETWEEN DIFFERENT LIGHTING PARAMETERS
LIGHT OUTPUT RATIO (LOR):
The ratio of the light output of a luminaire to the light output of the lamps without a
luminaire.
LOAD FACTOR:

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The ratio of energy consumed by a controlled lighting installation to the energy which
would have been consumed without controls, over a period of time.
Definitions
LAMP LUMEN MAINTENANCE FACTOR (LLMF):
The proportion of light output of a lamp, after a specified number of hours operation, to
the initial light output of the lamp.
LAMP SURVIVAL FACTOR (LSF):
The % of lamps still operating in an installation after a specified number of hours
operation.
LIGHT LOSS FACTOR (LLF):
This term has been replaced by maintenance factor in the 1994 CIBSE Guide. Previously
LLF and MF differed in that the latter took no account of the lamp lumen maintenance
factor (LLMF). In the 1994 Guide, maintenance factor takes LLMF into account.
LUMINAIRE MAINTENANCE FACTOR (LMF):
The ratio of light output after a specified period of time to initial light output of the
luminaire. This takes account of dirt and dust reducing the light output of the luminaire.
ROOM INDEX:
This takes account of room proportions and height of the luminaire above the working
plane. It is used to determine the Utilisation factor.
L x W
R.I. = ----------------
(L + W) Hm
where
L = Length
W = Width
Hm = Height of luminaire above working plane.
MAINTENANCE FACTOR (MF):
The ratio of illuminance at the end of the maintenance period to the initial illuminance.
MF = LSF x LLMF x LMF x RSMF.

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Basic Definitions of Light
ROOM SURFACE MAINTENANCE FACTOR (RSMF):
The proportion of illuminance at the end of the maintenance period to the initial
illuminance taking account of the reduction in room reflectance because of dirt and dust.
It is separate to LMF and LLMF.
SPACE TO HEIGHT RATIO (SHR):
The ratio of: Distance between luminaire centers, in a regular square array of luminaires,
divided by their height above the working plane.
UTILISATION FACTOR (UF):
Proportion of light reaching working plane to light output of lamps. It depends on room
index, room reflectance’s and type of luminaire used.
LAWS OF ILLUMINATION OR LUMINANCE
• INVERSE SQUARE LAW: The area illuminated by the point light source
increases in proportion to the square of the distance. It follows that the average
illuminance would decrease by the same ratio.
I
E = ----
d2
where d = the distance between the source and the object.

42
Basic Definitions of Light
• LAMBERT’s COSINE LAW: When light does not fall normally on a surface,
the area illuminated increases reducing the average illuminance by the same ratio.
The Fig. shows light from a distant source striking surfaces AB and BC. The rays
of incident light may be taken as parallel.
AB
---- = Cos θ
BC
where θ = The angle between the incident light and the normal to the surface BC.
Therefore the average illuminance on a surface is given by the general formula:
I Cos θ
Ε = −−−−−
d2
LUMEN METHOD OF LIGHT CALCULATION
This method is most suitable for interior lighting design , where a high proportion of light
on the working plane is reflected by internal surfaces. For external applications or where
the reflectance of the surfaces is unknown or may not be relied upon (emergency lighting
schemes), a utilisation factor for zero reflectance may be used. The lumen method,
sometimes called the luminous flux

42
Definitions
method of calculation, is normally used to calculate the average illuminance on
working planes, or to calculate the number of luminaires required to provide a
specified average illuminance in rooms. The following formula is used:
N (n . φ) . MF . UF
E = --------------------
A
or
E x A
N = -----------------
Mf . UF . (φ . n)
Where:
N = Number of luminaires required
E = Maintained Illuminance (lux)
φ = Initial lamp output (lumens)
n = Number of lamps in luminaire
MF = Maintenance factor
UF = Utilisation factor
A = Area of room (m2
)
• UTILISATION FACTOR:
Lumens received on W.P.
UF = ---------------------------------
Lumens output of luminaires
Utilisation factor takes account of the
loss of light due to absorption on room
surfaces. It depends on 3 factors:
1. Type of Luminaire:
A luminaire with a concentrated light output directed on
the working plane will have a higher UF
than a luminaire with a dispersed light output.
2. Room index. This takes account of
the length (L) and width (W) of the room
and the height of the luminaires above
the working plane (Hm).

42
Definitions
L x W
R.I. = ------------
(L + W) Hm
2. Reflectances of Room Surfaces.
Bright coolers with high reflectance’s
result in a higher UF. A high utilisation
factor will mean fewer lamps are needed
resulting in a more efficient energy usage
and a lower capital cost.
• SPACE: HEIGHT RATIO (SHR):
This is the ratio of space between
luminaires (S) to their height above the
working plane (Hm).
Manufacturers will specify a
recommended SHR for each of their
luminaires. Ensuring that luminaires
are spaced within the recommended
value will mean an acceptable variation
in illuminance across the working
plane. This is expressed in terms of the
Uniformity Ratio (see definitions).

42
CHAPTER 2
Case Study One
PART I: Workstation Lighting Design
This project will gives us a quick interior lighting layout. With the help of this wizard it is
possible to complete lighting design and simply. We will also be able to run full lighting
calculation in lux and produce professional quality reports.
Double click on the DIALux light icon on our computer. After starting , we are
welcomed by a startup window (see Figure 1). To move to the next window click on next
Figure 1.
Step 1.Enter Project Information
In the Project Information Window(See Figure2),we can enter the data about our
project . this information will appear later in our printour reports.
A. In this example ,enter the following data:
Project: Office lighting design
Room: workstation in office building
Surface condition: Clean surface
Nature of work :computer working
Age of worker :22-40
Average lux level -500lux
Selected lamp – 18 Watt T5
Selected luminaire- philips made TBS300/418, MIRROR-M5

42
B. On the right side of this window , we should already see the name
,company name, etc. that we entered during the configuration of
DIALux. We can change any of this data as necessary
C. Click the Next Button when finished(see Figure 3)
Case Study One
Figure 2

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. Figure 3
Case Study One
Step 2.Enter Room Dimensions, Reflectance Values
The next window is for Data Input (see Figure 3) where we specify the room geometry on
the left hand side. We can also change the reflectance values used for the ceiling, walls
and floor as necessary.
For this project, we will create a room
a) Enter the following data:
Length (a):10.00m
Width (b):7.00m
Height: 3.00m
b) For Reflectance Factor, Light Loss Factor, And work plane enter the
following data:

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Ceiling: 80%
Walls: 50%
Ground: 68%
Light Loss Factor: 0.80
Work Plane Height: 0.560m
c) On the right side of this window, click on the Catalogs button to
open up the luminaire database .We chose TBS300/418,MIRROR-
C6 Luminaire. Click Next when finished.
Step3. Luminaire detail
a) No luminaires-12 Pieces
b) Type of luminaire- 6TBS300/418,MIRROR-M1 & PHILIPS SOLID STATE
LIGHTING
c) Reflector used -MIRROR-M5
d) Lamp used – 4 X 18 watt T5 ,
e) Luminaire Luminous Flux: 5200 lm
f) Luminaire Wattage: 95.1 W
g) Fitting: 4 x TRULITE 18W (Correction Factor 1.000).
Case Study One
Step 4.Calculation and Results

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a) In the Calculation and Results window. A Under calculation parameters, enter 500
lux.
Use the drop down menu to change the Luminaire Mounting to surface mounted.
Click the Calculate icon and the program will start the point by point calculations.
b) Once the calculations are finished, the Light Wizard will display the results in a
figure of isolux lines and a table of lux values for the work plane (see Figure4)
c) Click the Calculate icon and the program will start the point by point calculations
d) Once the calculations are finished, the Light Wizard will display the results in a
figure of isolux lines and a table of lux values for the work plane (see Figure 4).
e) .Click Next to continue to Step 4
Figure 4
Case Study One
Step 5. Print Report and Export to DIALux.

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In the Result Output window you have the option to print the results or save them in
electronic format as a PDF file
a) Click on the Save as DIALux Project button to save our project for further
analysis.
b) Click next and then click finish to close the program.
Figure5. Results Output Window

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Case Study One
PART II. Continuation of Project – workstation in office
This project will build upon the workstation in office room completed in Project #1.we
will learn how to add objects, move luminaires around and add additional calculation
grids.
Double click on the DIALux icon on your desktop - or click Start -> All Programs ->
DIALux. we will be welcomed by a startup window (see Figure 6).
Figure 6
Step 1. Open project
Click on the Open Project icon, and navigate to where you saved the “interior office lighting
project” and click Open to load the project (see Figure 13)

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Figure 7
Case Study One
Step 2. Add Objects to the Project
A. Open the project.
B. Under Project Manager, click the Floor Plan icon
C. When click the floor plane icon we get workstation in floor palne view(see
figure 8)

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Figure 8
You can also change the objects’ location/properties in the Room View. Once an object
has been inserted into a room, its context menu can also be accessed with a right click
(see Figure 9).
Case Study One
Step 3. Add office furniture and office accessories:
a. Under the project manager, click on the object icon.(see figure 10)

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Figure 10
b. Click on furniture points and extract it.
c. Then click the need things and drag over to the plane view.(see figure 11)
Figure 11
d. When the office accessories (table, chair, door, computer, dustbin etc.) drag over
to the plane view it is looking like figure 12.
Case Study One

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PART III: Run Calculations and View Results
a. Under the main menu, click on Output and Start Calculations. When the
Calculation window opens, make sure to place a check in the box next to
Include Luminaires in Calculations and then click OK .
Figure 13

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Case Study One
b. View and Print Output:
Under Project Manager, click the Output tab. Here we have many options on the type of reports to send to
the client. In this example, place a check in the boxes next to: Project Cover, Summary, Input Protocol,
Luminaires.
Figure 14
c. Luminaire image :
TBS300/418,MIRROR-M5

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Case Study One
OFFICE WORK PLACE AREA /Summary:
-----------------------------------------------------------------------------------------------------------
-

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OFFICE WORK PLACE AREA / Photometric Results:
-----------------------------------------------------------------------------------------------------------
-
Total Luminous Flux: 124800 lm
Total Load: 2282.4 W
Light loss factor: 0.80
Surface Average Illuminances [lx] Reflection
factor [%]
Average
luminance
[cd/m²]
direct indirect total
Workplane 278 160 438 / /
Floor 179 131 310 15 15
Ceiling 0 201 201 80 51
Wall 1 126 152 278 82 73
Wall 2 125
125
178
146
304
270
82
82
79
71
Wall 3
Wall 4 103 142 245 46 36
Table 1
Chapter 3
Case Study Two
PROBLEM PRESENTATIONS TWO
PART I: Conference Lighting Design
This is the project will gives us a quick interior conference lighting layout. With the help
of this wizard it is possible to complete lighting design and simply. We will also be able
to run full lighting calculation in lux and produce professional quality reports.
Double click on the DIALux light icon on our computer same as the previous project one.
After starting, we are welcomed by a startup window (see Figure 15). To move to the
next window click on next

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Figure 15
Step 1.Enter Project Information
In the Project Information Window,we can enter the data about our project . this
information will appear later in our printour reports.
a) In this example ,enter the following data:
i. Project: Office lighting design
ii. Room: conference in office building
iii. Surface condition: Clean surface
iv. Nature of work : conference, meeting
v. Age of worker : 22-40
vi. Average lux level -400lux
vii. Selected lamp – 18 Watt T5 and LED 1 WATT
viii. Selected luminaire- 6TBS300/418,MIRROR-M1 and Philips solid
state lighting
b) On the right side of this window, we should already see the name ,company name,
etc. that we entered during the configuration of DIALux. We can change any of
this data as necessary.
Case Study Two
c) Click the Next Button when finished(same as the project one).

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Step 2.Enter Room Dimensions, Reflectance Values
The next window is for Data Input where we specify the room geometry on the left hand
side. we can also change the reflectance values used for the ceiling , walls and floor as
necessary.
For this project, we will create a room,
a) Enter the following data:
Length(a):15.00m
Width (b) :10.00m
Height: 3.00m
b) For Reflectance Factor, Light Loss Factor, And work plane enter the
following data:
Ceiling: 80%
Walls: 50%
Ground: 68%
Light Loss Factor: 0.80
Work Plane Height: 0.560m
c) On the right side of this window, click on the Catalogs button to
open up the luminaire database .We chose TBS300/418,MIRROR-
C6 Luminaire and Philips solid state lighting.
d) Click Next when finished.
Step3. Luminaire detail
a) No luminaires-12 Pieces
b) Type of luminaire- 6TBS300/418,MIRROR-M1 & PHILIPS SOLID STATE
LIGHTING
c) Reflector used -MIRROR-M5
d) Lamp used – 4 X 18 watt T5 , 1 WATT LED

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e) Luminaire Luminous Flux: 5200 lm & 441 lm
f) Luminaire Wattage: 95.1 W & 14.7 w
g) Fitting: 4 x TRULITE 18W (Correction Factor 1.000)
Case Study Two
Figure 16: 6TBS300/418,MIRROR-M1 Figure 17: PHILIPS SOLID STATE
LIGHTING
a. When the conference room accessories (table, chair, door, computer, dustbin etc.)
drag over to the plane view it is looking like figure 12 and its 3D view look like
figure 19.

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Figure 19
Step 4: PART III: Run Calculations and View Results
a) Under the main menu, click on Output and Start Calculations. When the
Calculation window opens, make sure to place a check in the box next to Include
Luminaires in Calculations and then click OK.
b) View and Print Output:
Under Project Manager, click the Output tab. Here we have many options on the type of reports to send to
the client. In this example, place a check in the boxes next to: Project Cover, Summary, Input Protocol,
Luminaires.
Case Study Two

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OFFICE CONFERANCE PLACE AREA /Summary:
-----------------------------------------------------------------------------------------------------------
-

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Case Study Two
OFFICE CONFERANCE ROOM/Photometric
Results
-----------------------------------------------------------------------------------------------------------
Total Luminous Flux: 21214 lm
Total Load: 395.9 W
Light loss factor: 0.80
Boundary Zone: 0.000 m
Table 2
CHAPTER 4
Surface Average Illuminances [lx] Reflection
factor [%]
Average
luminance
[cd/m²]
direct indirect total
Workplane 83 32 115 / /
Floor 61 34 95 26 7.86
Ceiling 0.00 45 45 80 11
Wall 1 13 35 49 76 12
Wall 2 46
19
38
39
84
59
76
76
20
14
Wall 3
Wall 4 24 34 59 76 14

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Case Study Three
MATLAB COMPUTATION
Step 1. We are create a matlab programming for interior office conference room, see in
below
%Direct Hoz.illuminance computation on Hoz.working plane
%From single Luminaire placed at center of a room with dimension of 15m x 10m.
%Mounting ht = 4m
%Assigning of Input variables
xL=7.5; yL=5; hm=4;
i=1;j=1;
ESUM=0;N=0; Emin=5000;Emax=0;
%..............................
% Grid Point coordinate selection
for xg=0.25:0.25:14.75
for yg=9.75:-0.25:0.25
%.............................
% Direct Contribution from source at a Grid point
% NP: distance between nadir point(N) and grid point(P)
NP=sqrt((xL-xg)^2+(yL-yg)^2);
gama=atan(NP/hm);
I=500*(1+2*(cos(gama)));
Ep=(I*(cos(gama))^3)/(hm^2);
%......................
%Saving Grid-specific illuminance at 2-D array
E(i,j)=Ep;
%......................
%Cumulative Sum of Illuminance values and Number of grid points(N)
ESUM=ESUM+Ep;N=N+1;
%..............................
%Finding out Emin and Emax
if (Ep < Emin)
Emin=Ep;
elseif (Ep > Emax)
Case study three

42
Emax=Ep;
end
%.................
i=i+1;
end
j=j+1;
i=1;
end
%Uniformity of illuminance calculation
Eavg=ESUM/N
U1=Emin/Eavg;
U2=Emin/Emax;
%................................
%Plotting of Isolux contour and Mountain Plot
xg=0.25:0.25:14.75;
yg=9.75:-0.25:0.25;
[XG,YG]=meshgrid(xg,yg);
v=Emax*[0.90,0.80,0.70,0.60,0.50,0.40,0.30];
[C,h]=contour(XG,YG,E,v);
clabel(C,h);
axis([0.25,14.75,0.25,9.75]);
saveas(gcf,'ISOLUXplot1.fig')
pause
surf(XG,YG,E);
saveas(gcf,'MOUNTAINplot1.fig')
%............................
Step 2. Output result and diagram
we have get illumination average value office conference room in matlab Output file.
Eavg =26.1105
We have also get isolux plot figure form matlab output (Figure20 ) and also mountaing
plot figure form matlab output (figure 21).
Case study three

42
Figure 20
Figure 21
-:CONCLUSION:-

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The project has been done by us during one year and try to overcast the view of
interior lighting design .This project gives us a lot of knowledge about light, it’s
properties and indoor lighting design technique for different place in different
work .The project built help of DIALUX software which based on preparing for
lighting design.
→The DIALUX software can be established, how much light needed to the right
place for right work at right time.
→This type of lighting design modern efficient technique which can reduce the
power loss, so that technique was saving the energy from the bad worst. Here this
technique is used to build to working station and try to highlight the proper use of
light.
→ Here calculate the value of the various thing like flux, candela, lumens etc by
using the DIALUX 4 Version.
→ Here use the MATLAB software which is one of the suitable and easier process
for calculate of different essential lighting properties and also represent the
ISOLUX diagram which gives to us known to different phenomena about light
and its interior lighting design.
At last, it is a true thatT5s have proven to be extremely effective due to their long
lifespan and increased efficiency. However, T5 fluorescent bulbs have performed
significantly better in multiple studies that are critical to commercial and
residential usage ,it is important to consider crucial factors such as heat
dissipation, the CRI rating, efficacy, overall cost, and lifespan of bulbs.

42
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[2]Author Rajput ;Dhanpat company pvt ltd in ‘Energy conservation & Utilisation’
[3] Energy crisis
http://en.wikipedia.org/wiki/Energy_crisis
[4] illuminationfund
http://www.opticalres.com/lt/illuminationfund.pdf
[5] tutorial-dialux.pdf
http://gitalistia.files.wordpress.com/2008/12/tutorial-dialux.pdf
[7] Interior lighting design StudentsGuid
http://eleceng.dit.ie/kkelly/Lighting/Interior%20lighting%20design
%20%20%20%20%20%20Students%20Guide.pdf)
[8] surface-contour
http://www.math.neu.edu/~braverman/Teaching/Fall2000/surface-contour.pdf
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