British Zone Methode.pdf

8/11/2019 British Zone Methode.pdf

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Lighting

Instructor : Eng. Wael Younis


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Some Technical Expressions

Luminous Flux ( ) ( (

(Lumen (Lm

Luminous Efficiency ( ) ( (

( / )Lm W

P


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Illuminance Flux (E) ( (

Lux Lm/m) 2)

2( / )E Lm m Lux A

m( 2 (A :


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General Color rendering Index ) (

,

100 ( ) .

100 .


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Good Lighting Conditions In Buildings

. Illuminance Flux

Lux .

Luminaries .


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Required Illuminance for Different Places


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Incandescent Lamps

Fluorescent Lamps

Industrial Lighting Sourses

A. Filament Lamps

B. Gas Discharge Lamps

High Pressure Mercury Lamps (HPM)High Pressure Sodium Lamps (HPS)

Low Pressure Sodium Lamps (LPS)Metal Halide Lamps

Blend Light Lamps


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Incandescent Lamps


1. Outline of Glass bulb2. Low pressure inert gas

(argon, neon, nitrogen)3. Tungsten filament4. Contact wire (goes out of

stem)5. Contact wire (goes into stem)6. Support wires7. Stem (glass mount)8. Contact wire (goes out of

stem)9. Cap (sleeve)10. Insulation11. Electrical contact


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Incandescent Lamps


Luminous Efficiency ( ) = 10-15 Lm/W

Life Time = 1000 Hr

General Color rendering Index = 100


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Fluorescent Lamps


A fluorescent lamp orfluorescent tube is a gas-discharge lamp that useselectricity to excite mercuryvapor. The excited mercuryatoms produce short-waveultraviolet light that then

causes a phosphor tofluoresce, producing visiblelight.


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A preheat Fluorescent Lamp Circuit using an automaticstarting switch


A: Fluorescent tube, B: Power (+220 volts),C: Starter, D: Switch (bi-metallic thermostat),E: Capacitor, F: Filaments,G: Ballast


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C: Starter, D: Switch (bi-metallic thermostat),

E: Capacitor,


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F: Filaments,


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G: Ballast


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Compact Fluorescent Lamps (CLF)


A type of fluorescent lamp

Energy saving light

Many CFLs are designedto replace anincandescent lamp


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British Zonal Method (BZ)

Lighting Calculations

Desk or Bench

Height

0.85 m

Mounting Heightof Fitting (from

working plane)

Hm (m)

Room LengthW (m)

SuspensionHeight from

Ceiling

Hs(m)

Room WidthL (m)

Hm=Ht-Hs-0.85


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Room Index

The room index is a number that describes theratios of the rooms length, width and height.

( )

LWKr

Hm L W

Where :

L = Room LengthW = Room WidthHm = Mounting Height of Fitting (from working plane)Work Plane = Desk or Bench Height


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British Zonal Method (BZ)Reflection Factor

Reflection factor depends on :

Ceiling reflection factor c

Wall reflection factor w

Flour reflection factor f


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British Zonal Method (BZ)Reflection Factor values according to color


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British Zonal Method (BZ)Reflection Factor values according to material


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British Zonal Method (BZ) :

( , , , , )

Reflection Factor =0.5

( , , , , )

Reflection Factor =0.3

( , , , , )Reflection Factor =0.1


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British Zonal Method (BZ)Depreciation Factor: ( w = 0.3)


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British Zonal Method (BZ)S/Hm factor:The ratio of s pacing between the lighting units to

Height of the unit from the work plane.

S/Hm =1.2 82%

This means that for every 1 meter of mounting height(above work plane) we should have a maximum 1.2meters between fittings.

Andmin

max

100 82EE


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British Zonal Method (BZ)Red. factor:Depends on the power of the lamps on the unit

Ex.Red. Factor

2x40W=1.02x62W=0.92


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British Zonal Method (BZ)Utilization factor (Uf):

This is a value between 0 and 1 that represents thepercentage of total lamp lumens in the room that fall onthe work plane.

It depends on :Reflection factor Room idex

Lighting unit type.


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British Zonal Method (BZ)Technical Data for Industrial Lighting Units


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British Zonal Method (BZ)Technical Data for Industrial Lighting Units (F type)


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British Zonal Method (BZ)Technical Data for Industrial Lighting Units (D type)


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British Zonal Method (BZ)Technical Data for Industrial Lighting Units (S type)


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British Zonal Method (BZ)Technical Data for Industrial Lighting Units (DD type)


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British Zonal Method (BZ)Technical Data for General Lighting Units


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British Zonal Method (BZ)Technical Data for General Lighting Units (C type)


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British Zonal Method (BZ)Technical Data for General Lighting Units (E type)


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British Zonal Method (BZ)Technical Data for General Lighting Units (G type)


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British Zonal Method (BZ)Technical Data for General Lighting Units (H type)


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Luminous Flux ( ) for Different lighting units

i i h l h d ( )


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B i i h Z l M h d (BZ)


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Lighting Calculation Sheet

Hm=H t-Hs-0.85Height from the work plane (m)

HsSuspension Height (m)

HtTotal Height (m)

ARoom Area (m 2)

LRoom Length (m)

WRoom Width (m)

Project

Li h i C l l i


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Lighting Calculations

Desk or BenchHeight

0.85 m

Mounting Heightof Fitting (from

working plane)

Hm (m)

Room LengthW (m)

SuspensionHeight from

Ceiling

Hs(m)

Room WidthL (m)

Hm=Ht-Hs-0.85

B iti h Z l M th d (BZ)


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Uf Utilization Factor nLamp number in the unit

f Flour Reflection Factor wWall Reflection Factor

cCeiling Reflection Factor

Room Index

( )r m

LWK

H L W

B iti h Z l M th d (BZ)


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Longitudinal Lighting Unit Number

Number of calculated LightingUnits

ERequired Illuminance Flux (Lux)

Lamp Luminous Flux (Lm)

KRed. Factor

FDepreciation Factor

f

EAFN

nU K

L

LNN

W



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Calculated Illuminance Flux (Lux)

Calculated S/Hm Ratio

Cross Lighting Unit Number

L

WNN

W

/ mm

S AH

H N

.f

e

N nU KE

A F



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Applications: Lighting of Drawing office

: :

:

General Lighting Unit (C type) , Fluorescent2x40W



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Applications: Lighting of Drawing office

Hm=H t-Hs-0.85

Hs

Ht

A

L

W

Drawing office

2.15mHeight from the workplane (m)

0Suspension Height(m)

3.5mTotal Height (m)

50m 2Room Area (m 2)

10mRoom Length (m)

5mRoom Width (m)

Project



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Uf (table 1-13)

n

f (table 1-7)

w ( table 1-7)

c (table 1-6)

Utilization Factor

Lamp number in theunit

Flour Reflection Factor

Wall Reflection Factor

0.7Ceiling ReflectionFactor

1.55

Room Index

( )r

m

LWK

H L W



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Reflection Factor values according to color



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Uf (table 1-13)

n

f (table 1-7)

w ( table 1-7)

c (table 1-6)

Utilization Factor

Lamp number in theunit

0.2Flour Reflection Factor

0.3Wall Reflection Factor


1.55

Room Index

( )r

m

LWK

H L W



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Reflection Factor values according to material



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Uf (table 1-13)

n

f (table 1-7)

w ( table 1-7)

c (table 1-6)

0.47Utilization Factor

2Lamp number in theunit

0.2Flour Reflection Factor

0.3Wall Reflection Factor


1.55

Room Index

( )r

m

LWK

H L W



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Technical Data for General Lighting Units (C type)



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Power and Type of Lamp

E(table 1-23)

(table 1-17)

K(table 1-13)

F(table 1-8)


Required Illuminance Flux(Lux)


Red. Factor

1.33Depreciation Factor

f

EAFN

nU K



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Depreciation Factor: ( w = 0.3)



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E ( table 1-23)

(table 1-17)

K (table 1-13)

F (table 1-8)


Required Illuminance Flux(Lux)


1Red. Factor


f

EAFN

nU K



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( )

Technical Data for General Lighting Units (C type)



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( )


Fluorescent40W


E ( table 1-23)

(table 1-17)

K (table 1-13)

F (table 1-8)


Required Illuminance Flux

(Lux)

3000LmLamp Luminous Flux (Lm)

1Red. Factor


f

EAFN

nU K



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( )




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( )


Fluorescent40W


E ( table 1-23)

(table 1-17)

K (table 1-13)

F (table 1-8)

11.8 12Number of calculated LightingUnits

500LuxRequired Illuminance Flux

(Lux)

3000LmLamp Luminous Flux (Lm)

1Red. Factor


f

EAFN

nU K



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4.89 6

Longitudinal LightingUnit Number

E2=448 luxCalculated Illuminance

Flux (Lux)

0.59Calculated S/Hm Ratio

2.4 2

Cross Lighting UnitNumber

L

WNN

W

/ mm

S AH

H N

.f

e

N nU KE

A F

L

LNN

W

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