Heat Pipe Technology - Overview With Examples

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Transcript of Heat Pipe Technology - Overview With Examples

Heat Pipe Technology Practical ApplicationsHeat Carrying Capacity Formed Heat Pipes / Flattened and Bent Limitations of Bending / Min Radius Examples of the Technology: Heat spreading Increased fin efficiency Press-on or solder attach fins High conductivity thermal path

Heat Pipe Design - QmaxQmax (W) Flattened Thickness** T = 2.0mm T = 2.5mm T = 3.0mm Round Pipe Diameter

3 mm10 W 14 W 15 W 16 W

4 mm15 W 17 W 19 W 20 W

5 mm21 W 32 W 42 W 46 W

6 mmN/A 46 W 56 W 60 W

8 mmN/A 65 W 75 W 85 W

Qmax vs. Flattened Thickness for Different Pipe Diameters100 80 60 40 20 0 1.5 2 2.5 3 3.5 Round 4

Typical Qmax Values of Heat3 mm4 mm5 mm 6 mm8 mm

Pipes for the length of 150mm: Standard Deviation: 5%. Operating temperature at 60 + 3 . Internal temp rise at Qmax = 3 to 5 C applications. Use in heat spreading significantly increases heat capacity.

Qmax (W)

Flattened Thickness (mm)

** Qmax shown is based on stand-alone

Heat Pipe Design Dimension Spec. Diameter tolerance: 0.05mm Length tolerance: 0.5 to1.0mm Thickness tolerance: 0.05mm Width tolerance: 0.10 to0.15 mmDiameter (mm) 3 4 5 6 6.35(1/4) 8 Length (mm) 70 - 750 70 - 750 70 - 750 70 - 750 70 - 750 70 - 750 Bending Radius (mm) >9 > 12 > 15 > 18 > 19 > 24 Flattened Thickness (mm) >2 >2 > 2.5 > 2.5 > 2.5 > 2.5

Heat Pipe Design Dimension Spec.Diameter =3mm =4mm Thickness(T) 2.0 2.5 2.0 2.5 3.0 2.0 2.5 3.0 3.5 4.0 2.0 2.5 3.0 3.5 4.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 6.0 (T)Tolerance +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 +0.05/-0.10 Width(W) 3.65 3.32 5.23 4.96 4.65 6.82~6.84 6.53 6.26 5.95 5.63 8.45 8.16 7.84 7.57 7.30 Undone 11.39 11.15 10.83 10.60 10.27 10.01 9.36 (W)Tolerance +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15 +0.15/-0.15

=5mm

=6mm

=8mm

Heat Pipe Design Dimension Spec.R-AngleMin. R 3 4 5 6 8 9 9.35 9 12 15 18 24 27 28 Suggested 12 16 20 24 32 36 37 90 120 Min. Bending Angle Suggested

R

Heat pipe with solder attached fins used in wafer fab control system.

Vertically oriented heat pipe assemblies. One large dia. versus multiple smaller heat pipes. Heat pipes are isothermal body increasing fin efficiency at any distance from heat source.

Active heat pipe assemblies used in notebook computers Includes blower, flattened heat pipes and stamped fins.

Heat pipe assembly with stacked fins pressed in place. Used in instrumentation control rack system.

Kilowatt IGBT power module cooler

Combined Heat pipe / water cooling Jacket for hi-def CCD camera.

Heat pipes used in heat spreading to increase effective effective thermal conductivity.

Dual heat pipe assy used in sealed, hardened computer. Transfers heat from processor and graphics chip to lid.