WIPRO Energy Efficiency perspective in lighting design Efficiency... · Energy Efficiency...
Transcript of WIPRO Energy Efficiency perspective in lighting design Efficiency... · Energy Efficiency...
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Energy Efficiency perspective in lighting design
By Nalini SrinivasanWipro Lighting, Chennai
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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
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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
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Energy Efficient Lighting Solution
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Lighting Design Process Involves
• Selection of Luminaire
• Selection of Light Source
• Selection of Control Gear
• Selection of Lighting Controls System
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Luminaire Selection Criteria
CHOICE OF LUMINAIRE • Application• Light distribution pattern• Efficiency (DLOR)• IP rating• Size• Appearance• Maintenance• Cost
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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
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20
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CFL FTL T5 LED
CFL
FTL
T5
LED
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Options in Control Gear
PPF Electronic Ballast
Electromagnetic Ballast APF Electronic
Ballast
1-10V Analogue Dimmable ballast
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Options in Lighting Controls
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Lighting Controls
Static Lighting Controls –Passive Infrared Sensor suitable for Movement Detection with Automatic Switching of Luminaries
PIR Movement Detection Sensor
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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.
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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.
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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
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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.
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Sample Project Simulation for Outdoor Lighting
Total Upward Flux Ratio Should be less than 5%
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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
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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
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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)
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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
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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
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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
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Sample LPD Calculations
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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
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Wipro Movement – An Eco Eye Initiative
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Nalini Srinivasan
Manager- Lighting Solutions Wipro Lighting,Chennai
Thank You