LED Back Light Cooling for Display Back of Display Display Heat - - PowerPoint PPT Presentation
LED Back Light Cooling for Display Back of Display Display Heat Pipe Heat Sink LED Back view of Meter Panel Front view of Meter Panel Thermal performance Plate Heat dissipation 10W Fin (Attached LED) LED temp. < 90oC at ambient 65oC
Front view of Meter Panel Back view of Meter Panel Display Back of Display Heat Pipe Heat Sink LED
Heat Pipe Heat Sink Fin Heat Pipe Plate (Attached LED) Thermal performance Heat dissipation 10W LED temp. < 90oC at ambient 65oC under natural convection condition Advantage 1) Silent (no fan) 2) High reliability (no fan)
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Heat pipe (heat dissipation to frame) Thermal performance Heat dissipation 15W LED temp. < 90oC at ambient 40oC under natural convection condition Advantage 1) High performance 2) High reliability (no fan) Frame Heat sink
LED Head Lamp
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LRU unit example
Individual LRU packed in cabinet
Air flow by use airplane air cooling system or in-built fan
Cooling concept development example 1
Electronic boards Heat sink LRU module Heat pipe
Cooling concept development example 2
Heat pipe
to chassis for cooling
Heat pipe transfer heat to heat exchanger outside of box.
Cooling concept development example 3
Heat pipe Heat sink
Advantages:
moving parts, reliable.
factor.
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Vapor Chamber Base (4mm Thk.) Solder (0.15mm Thk.) Copper(0.3mm Thk.) Ceramic (0.6mm Thk.) Copper(0.3mm Thk.) Casing IGBT Die (0.2mm Thk) Solder (0.15mm Thk.) Cover Silicon gel (optional)
Cooling IGBT
DC/DC Inverter for Motor Speed Control
Cold Plate
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Base: A1100, 700 x 330 x 20mm Fin: A1100, 700 x 150 x 0.5mm, Pitch 9mm, 51pcs Heat Pipe: D15.88 x 19pcs
700 400 510
Cross-section of HP
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Examples of some heat sinks for semiconductor power device
Heat pipe with ceramic insulator joints for cooling high power (kW) thyristor. Metal saw machining technology can produce any size and shape heat sinks.
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CPU
For Blade Server
MCM 1 KW Vapor Chamber Vapor Chamber for 2U-4U Server Fins Copper-Water Vapor Chamber
For Blade Server
Substrate TIM Captive Hardware
Vapor
Vapor Chamber Heat Sinks for Server
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Two dimensional heat flow
Heat Pipes Copper Fins Vapor Chamber Base
Heat In Heat Out
Vapor Chamber Heat Pipe Fins
Vapor Flow Liquid Flow
0.160 0.180 0.200 0.220 0.240 0.260 0.280 0.300 20 25 30 35 40 45 Air Flow [CFM] Rca [oC/W] Design VC+HP (Test Results) Design VC+HP (Calculation) Solid Base (Calculation)
250W GPU
Thermal performance of Vapour Chamber + Heat Pipes
Vapour Chamber + Heat Pipes for Graphic Chip
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Ultra Thin Vapour Chamber
Ultra thin High heat dissipation capability
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Distinguishing features: ① Porous structure only in evaporator ② Transport lines made from bare tube ③ Separated liquid & vapour flow 1 2 3 4
Evaporation Heat transfer by vapour Condensation Liquid transport by capillary effect
Operating Principle
Evaporator Wick Condenser Liquid Heat Source Heat Sink Vapour Flow Container Liquid Flow
1 3 4
Liquid line Condenser Vapour channel Liquid reservoir Wick Evaporator (grooved tube) Vapour line Vapour channel (grooved portion) Heat input Heat output
1 2 3 4
Loop Heat Pipe: Concept
Loop Heat Pipe Advantages: ① High heat flux capability ② Long distance heat transfer ③ Orientation independent operation
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Wick
Evaporator + compensation chamber (liquid reservoir) Condenser (different configurations possible) Vapour line Liquid line Liquid flow Vapour flow Wick Liquid reservoir Vapour flow channels Bayonet tube (for uniform liquid distribution inside wick core)
Loop Heat Pipe Design and Working
Why Loop Heat Pipe ?
High heat transfer capability Longer distance heat transport Orientation independent operation No leakage issues (safe system) No moving parts (reliable & powerless system) Smaller system volume (two phase system) High system performance at high heat loads
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Loop Heat Pipe: Application Areas
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Vehicle Thermal Management
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Ground Transport: Automotive Air Transport: Aircraft
High heat load Long distance heat transport Variable Orientation Acceleration & Vibrations Issues Multiple heat sources
Challenges
Thermal Control (Cooling/Heating) Energy Conservation
Objectives
Aviation Applications
Galley Heating Wing Anti Icing Engine Anti Icing DM-Fuel Cell Cooling
Co-generation (Power + Heat) System
CPC Rack LRU
Thermal control: Heating Thermal control: Cooling Interior Exterior 1 2 3
Load d cabine net (Gal alley ey ) LHP Conden enser ser Fuel cell stack ack LHP Evapo porat ator
Vapour ur chamber amber or heat at sprea eade der with h heat at pipes s Vapour ur line
~
Elect ctric c Output utput
Water purifier Fuel supply syste tem
Portab able e water er Fuel in By By-product products s out Liquid d line Air in Air out
LHP-DMFC Cogeneration System
Heat t exch changer Cold ld wate ter In Hot t wate ter r Out 18 > 1 m
Specifications: Large scale Heat load: 0.5 – 1 kW Distance: > 1 m
Existing Anti Icing System
Hot air bled from the engine compressor Air exhausted Internal swirl
Engine Anti Icing
Heat required: 5.75 kW/m
Wing size: B737 (Small plane): 9 m B777(large plane): 20 m
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LHP based Ice Protection System
Heat transfer distance: 5 m Q = 2 x 6.9 = 13.7 kW 510 mm 45 mm 175 mm Gravity LHP Evaporator Liquid reservoir LHP System Liquid line Vapour lines vapour from evaporator Liquid to evaporator Leading edge Leading edge Loop heat pipe condenser Vapour line Liquid line
Condenser details
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Specifications: Large scale Heat load: 0.5 – 1 kW Distance: > 1 m
Condenser plate Vapour line Liquid line Heat spreader Evaporator
CPC Rack Cooling
Nickel or Titanium wick Charging line Tube connector Heat spreader Liquid chamber From liquid line From vapour line Bayonet tube 10 mm 150 mm
Specifications: Small scale Heat load: 30 – 50 W Distance: 100- 150 mm
Automotive Applications
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Battery Cooling Heat load: 0.5 – 1 kW Distance: 0.25 – 1 m LED Headlamp Cooling Heat load: 25 – 50 W Distance: > 150 – 250 mm
Spreader plate LHP Condenser LHP Evaporator Battery Stack Heat Pipes Loop heat pipe prototypes Loop heat pipe prototype
Condenser Liquid line Vapour line 1000 mm Evaporator
Nickel wick with copper evaporator tube
Wick installed inside evaporator
Loop Heat Pipe Prototype
Evaporator Internal Details
Ungrooved CC section Grooved evaporator portion Nickel wick Copper tube
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250 mm
Cylindrical Evaporator: Performance Results
Copper-water LHP with Nickel wick Horizontal heat mode 50% charge ratio Heated length: 55mm (20 W/cm2)
0.11 0.13
Variable conductance Constant conductance 24
Orientation Tests
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Horizontal heat mode Top heat mode
0.5 m 0.25 m 1 m 1 m THM 0.5 m THM 0.25 m THM Horizontal HM 40 50 60 70 80 90 100 100 200 300 400 500 600 Evaporator Temperature, °C/W Heat Load, W
0.0 0.5 1.0 1.5 2.0 2.5 100 200 300 400 500 600 Total Thermal Resistance, °C/W Heat Load, W
Loop heat pipe was able to transfer > 500 W at any orientation with heat source temperature < 100 ºC