What is a Thermosiphon?

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe or vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling.

TIM (Thermal Interface Material) - Required to minimize thermal resistance between a heat source and the evaporator.

Evaporator (Base) - Internal structure minimizes boiling resistance with optional copper evaporator for extremely high heat flux devices.

Vapor Tube - Minimize pressure drop between evaporator and condenser to enable lower profile thermosiphons for higher power components.

Condenser - Vapor condenses back to a liquid releasing its transported heat to the air side fins.

Condenser Air Side Fin - Fins add extended surface area to efficiently dissipate heat to the air through forced or natural convection.

Liquid Tube (or Return) - Minimize pressure drop between condenser and evaporator to enable lower profile thermosiphons for higher power components.

Liquid - Dielectric fluid that moves heat using its heat of vaporization is selected based on thermal, structural, and environmental requirements.

Mounting Hardware - Mounting hardware is added to attached to heat generating components.

Boyd Corporation

Types of Thermosiphons

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe of vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling while having a favorable orientation with respect to gravity.

Direct Contact Loop Thermosiphon - Transfer high powers over long distances to remote cooling fins for compact, extreme are cooling.

Direct Contact Loop Thermosiphon Example

2D Thermosiphon Fin - More efficient fins increase thermal capacity and reduce weight of die cast or other larger heat sinks.

2D Thermosiphon Fin Example

3D Direct Contact Loop Thermosiphon - Spread heat evenly throughout a given volume to maximize heat dissipation without increasing cooling volume.

3D Direct Contact Loop Thermosiphon Example 1

3D Direct Contact Loop Thermosiphon Example 2 and 3

Air to Air Loop Thermosiphon - High Efficiency enclosure cooling for sealed cabinets.

Air to Air Loop Thermosiphon Example: Manifolds, Condenser, Evaporator

Types of Thermosiphons:

Direct Contact Loop

2D Thermosiphon Fin Thermosiphon

3D Direct Contact Loop Thermosiphon

Air to Air Loop Thermosiphon

3D Direct Contact Loop Thermosiphon- Spread heat evenly throughout a given volume to maximize heat dissipation without increasing cooling volume.

Manifolds

Fins

Base

TIM

Heat Source

Gravity Direction (downward)

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe or vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling while having a favorable orientation with respect to gravity.

Boyd Corporation

Direct Contact Loop Thermosiphon- Transfer high powers over long distances to remote cooling fins for compact, extreme air cooling.

Condenser fins

TIM

Heat Source

Gravity Direction (Downward)

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe or vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling while having a favorable orientation with respect to gravity

Boyd Corporation

2D Thermosiphon Fin

More efficient fins increase thermal capacity and reduce weight of die cast or other larger heat sinks.

2D Thermosiphon Fin

Gravity Direction

Thermosiphon

Heat Sink Base

TIM

Heat Source

Fin

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe or vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling while having a favorable orientation with respect to gravity.

Air-to-Air Loop Thermosiphon

High efficiency enclosure cooling for sealed cabinets

Air-to-Air Loop Thermosiphon

Manifolds

Condenser

Evaporator

Thermosiphons are a form of Extreme Air Cooling that extend air cooling performance beyond what is possible with heat pipe or vapor chamber enhanced thermal solutions for those customers attempting to delay the transition to direct liquid or immersion cooling while having a favorable orientation with respect to gravity.