Download Natural light illumination system

Natural light illumination system
Irfan Ullah
Department of Information and Communication Engineering
Myongji university, Yongin, South Korea
Copyright © solarlits.com
Contents
•
•
•
•
•
•
•
•
•
•
•
Introduction
Indoor lighting system
Static solar concentrator
Coupler
Optical switching
Beam splitter
Light pipe
Light module
Simulation
Application
Conclusions
Introduction
• Green energy has been gaining popularity
• Solar energy: natural lighting
• Illumination system
– Collecting
– Transmission
– Lighting components
• Passive and active systems
• Top lighting and side lighting
Concept of daylighting
Concept
• Static concentrator (prismatic and cascadable)
• Transmission (fiber coupler)
– Multi-fibers to one fiber
• Light switching
– To control and change the direction of light
• Beam splitter
– High pass and low pass dichroic coating)
• Hybrid system
– LED light + sunlight
Indoor lighting system
• Static concentrator (prismatic and cascadable)
• Illumination system
– Light collection unit
– Transmission unit
– Lighting unit
Architecture of Indoor lighting system
Indoor lighting system
Indoor lighting system
cont’d..
• Static concentrator (prismatic and cascadable)
• Illumination system
–
–
–
–
Light collection unit
Transmission unit (coupler and optical fiber)
Optical switching (red, green, and blue)
Lighting unit (lightpipe, optical sensor, and LED array)
Static light concentrator
Static solar concentrator
• Inexpensive, easy to install, and without tracking
• Working
– Sunlight→line beam→point soure
Prism array
Prismatic structure
Static solar concentrator
Incident angle of sunlight
Collector’s efficiency
cont’d..
Coupler
• Light from prismatic structure into fiber
• Light from multi fibers into one fiber
Stepped coupler
Coupler raytracing
Traditional coupler 2 x 1, efficiency = 7.65%
Coupler
cont’d..
• Traditional coupling efficiency = 7.65%
• Stepped coupler efficiency = 50.28%
Stepped coupler
Coupling efficiency
Optical switching
•
•
•
•
•
•
•
•
Radiusfiber 1 and fiber 2 = 9 mm
Radiusfiber 3 = 20 mm
Anglefiber 1 = ±40
Telecentric system: 20 mm
Cubic structure size = 52 mm
Curvaturesurface 1 = 0.086
Curvaturesurface 2 = 0.088
Efficiency = 32.23%
Original optical system
Optical system after second
optimization
Light switching
Ray tracing
Beam splitter
• Fresnel lens layer on the incident and exit surfaces
– Parallel beam
– To achieve different wavelengths
– Applied on top, left, and right surfaces
• Prism size: 52 mm x 52 mm x 52 mm
– Fiber radius = 9 mm
– 600 (red), 550 (green), 480 mm (blue) cuteoff: 575 and 515 nm
Dichroic mirror
Dichroic prism
Beam splitter
Light pipe
•
•
•
•
Dot pattern for light distribution
Diameter = 16 mm
Length = 150 mm
Coupled efficiency = 91%
Light pipe
Light pipe
Light pipe design
Illumination
Ray tracing
Comparison of different dot patterns
Dynamic light guide
•
•
•
•
Dimensions: 100cm x 100 cm x 4 cm
Light pipe length = 100 cm ; radius = 9 mm
Flux of each pipe = 1500 lm ; LED = 75 lm
Parabolic reflectors = 5 ; receiver's surface area = 16 m2
Dynamic lighting module: 5 light pipes and 100 LEDs
Dynamic light guide
Detected flux by sensor = 0.357 lm
Average illuminance = 258 lx
Surface area = 16 m2
Illumination by sunlight
Summary of simulations
Detected flux by sensor = 0.18 lm
LED’s emit 37.5 lm
Average illuminance = 237.96 lx
Illuminance distribution
by hybrid lighting
Detected flux by sensor = 0.1 lm
Average illuminance = 217 lx
Illuminance distribution by
LEDs
Ecological illumination system
Lighting system for traffic tunnel
Parameters of traffic tunnel
Requirements for illumination
Ecological illumination system
Chinese national standards
Flux for each illumination section
K, Conversion factor of average illuminance
N, Number of lamps
U, Illumination rate
Collecting
M, Maintenance factor
F, Total flux for singlw lamp
L, Brightness requirement
W, Road width
units
Ecological illumination system
Frontal view of tunnel
Single lamp
Six lamps
Conclusions
• Collecting part
– Static prismatic concentrator
– Stepped structure coupler with efficiency 50.285%
• Transmission part
– Cubic structure light switch with efficiency 32.23%
– Prismatic structure beam splitter
• Distribution part
– Dot pattern with light pipe
• Hybrid system
– LEDs light + sunlight
THANKS ?