wipro energy efficiency perspective in lighting design efficiency... · energy efficiency...

Confidential © 2009 Wipro Ltd

© 2009 Wipro Ltd - Confidential

Energy Efficiency perspective in lighting design

By Nalini SrinivasanWipro Lighting, Chennai

© 2009 Wipro Ltd - Confidential2 © 2009 Wipro Ltd - Confidential2

Structure of Presentation

• Lighting in Conventional Buildings• Energy Efficient Building Codes• Lighting Design Process• Luminaire Selection Criteria• Source Selection Criteria• Lighting Controls • Green Buildings Overview



Lighting in Conventional Building

ü Normal MO Luminaire

ü FTL / CFL Lamps

ü Electromagnetic or Electronic Ballast

ü Occupancy Sensor and Photocell Sensors are not mandatory

ü No Restriction on Lighting Power Density

ü Lux Levels as per Local Standards

ü No consideration for Light Trespass and Lighting Pollution

Conventional Buildings


Energy Efficient Lighting Solution




Lighting Design Process Involves

• Selection of Luminaire

• Selection of Light Source

• Selection of Control Gear

• Selection of Lighting Controls System



Luminaire Selection Criteria

CHOICE OF LUMINAIRE • Application• Light distribution pattern• Efficiency (DLOR)• IP rating• Size• Appearance• Maintenance• Cost


Lamp Selection Criteria

CHOICE OF LIGHT SOURCE –• Luminous efficacy• Avg. service life• Colour Rendering Index• Hot restrike time• Starting time• Lumen depreciation• Size • Wattage• Cost

0

20

40

60

80

100

120

CFL FTL T5 LED

CFL

FTL

T5

LED



Options in Control Gear

PPF Electronic Ballast

Electromagnetic Ballast APF Electronic

Ballast

1-10V Analogue Dimmable ballast


Options in Lighting Controls



Lighting Controls

Static Lighting Controls –Passive Infrared Sensor suitable for Movement Detection with Automatic Switching of Luminaries

PIR Movement Detection Sensor


Role of Lighting for GREEN buildings

Lighting forms a important part of any interior, and also contributes in a significant way towards 17 – 20% of the overall building’s energy usage.It therefore, plays a key role towards building green.



Light pollution reduction

How is light trespass controlled?Light Trespass may be controlled or minimized by following the

general suggestions provided by the Illuminating Engineering Society of North America (IESNA 1999):

aConsider the surrounding area during the lighting design, and select luminaires, locations, and orientations that minimize spill light onto adjacent properties.

aSelect luminaires that control the intensity (candela) distribution.

aUse well-shielded luminaires.

aKeep floodlight aiming angles low so that the entire beam falls within the intended lighted area.


Fig. 1 (Use of Shielded bollard for directional bollard for pathway)

Fig. 2 (Use of Floodlight luminaire with proper distribution to avoid light trespass into other areas)

Fig. 3 (Façade or Hording Lighting from the Top to avoid light pollution)

Fig. 4 (Luminaire need to use with proper tilt angle to avoid light pollution for outdoor sports areas)

Light pollution reduction techniques



Lighting Power Density

1. The maximum lighting power per unit area of a building classification of space function.

2. A comprehensive source for understanding the lighting models underlying the commercial lighting power limits developed in

ASHRAE/IESNA 90.1-2004.


Sample Project Simulation for Outdoor Lighting

Total Upward Flux Ratio Should be less than 5%



Sample Project LPD Calculation for Outdoor Areas

Area Type

Luminaire Type

LPD As per ASHRAE Norm for Outdoor Areas

Lighting Design Complying to Green Norms


High efficiency luminaire design

1. Luminaires that create perfect visual ambience2. Unique design features delivering higher efficiency to help reduce

Light Power Density of the building3. High Light Output Ratio (LOR) – High efficiency through higher

utilization factor – 60% to 80%

SOLUTION



High efficiency light sources

Selecting the right light sources :- Luminaires with FTL(T5), CFL and LEDs- Light sources with high luminous efficacy (lm/w)

for eg. FTL (T5) 75-105 lum/w, CFLs 65-80 lum/w

- Light sources with high colour rendering index- Light sources with high life

SOLUTION

Fluorescent TubularLamps (FTL)

Compact FluorescentLamps (CFL)

Light Emitting Diodes(LED)


High efficiency control gear

Ballast –- Visual comfort through constant wattage, constant light output- Active complies with RoHS norms (Restriction of Hazardous Substances Directive) - Ensures upto 35% (non-dimming) and 70% (dimming) energy savings

SOLUTION



Saving energy with Lighting Controls

Lighting Controls :- Presence Detection sensors help in detecting absence and switching off the luminaires- Photocell sensors regulate luminaire light output as per the daylight intensity

SOLUTION


Personalized controls through Task lighting:Personalized – flexibility to choose brightness, direct light where necessary and significantly cut down glare.Elegant – Sleek design and easy adaptability to any office furniture systemSaves energy – adequate illumination for the desired task cutting down on luminaires required for ambient lighting

Task Light to save energy



Sample LPD Calculations


Energy Efficient Lighting Solutions means

ü High Efficiency Luminaires

ü T5 / CFL / LEDs

ü Ballast - Electronic / Dimmable

ü Occupancy Sensors and Photocell Sensors should be used

ü Need to Follow ASHRAE / IESNA Standard 90.1-2004 for Lighting Power Density

ü Lux Level as per Local Standards

ü Light Trespass and Lighting Pollution taken into consideration

ü Use of Task Light



Wipro Movement – An Eco Eye Initiative

© 2009 Wipro Ltd - Confidential

Nalini Srinivasan

Manager- Lighting Solutions Wipro Lighting,Chennai

[email protected]

Thank You

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