What are heat pipes?

Heat pipes are hollow metal pipes filled with a liquid coolant that moves heat by evaporating and condensing in an endless cycle. A Heatpipe can be considered a passive heat pump, moving heat as a result of the laws of physics.

How do heat pipes work?

As the lower end of the Heatpipe is exposed to heat, the coolant within it starts to evaporate, absorbing heat. As the coolant turns into vapor, it, and its heatload, convect within the heatpipe. The reduced molecular density forces the vaporized coolant upwards, where it is exposed to the cold end of the Heat pipe. The coolant then condenses back into a liquid state, releasing the latent heat. Since the rate of condensation increases with increased delta temperatures between the vapor and Heat pipe surface, the gaseous coolant automatically streams towards the coldest spot within the Heat pipe. As the coolant condenses, and its molecular density increases once more, gravitational forces pull the coolant towards the lower end of the Heat pipe. To aid this coolant cycle, improve its performance, and make it less dependant on the orientation of the Heat pipe towards earth gravitational center, modern Heatpipes feature inner walls with a fine, capillary structure. The capillary surfaces within the Heatpipe break the coolants surface tension, distributing it evenly throughout the structure. As soon as coolant evaporates on one end, the coolants surface tension automatically pulls in fresh coolant from the surrounding area. As a result of the self organizing streams of the coolant in both phases, heat is actively convecting through Heat pipes throughout the entire coolant cycle, at a rate unmatched by solid Heat spreaders and Heat sinks. 

By adjusting its dimensions, capillary surface structure, coolant formular and internal pressure, our engineers can fine-tune our Heat pipes performance, operating range and angle dependence, to match a wide range of operation.

A Heat pipe based cooling solution usually weighs less while moving more heat at a lower delta than traditional cooling solutions, increasing components and product lifetimes and operation reliability.

Heatpipes enable passive cooling solutions for high heatload and high temperature equipment, lacking moving parts and boasting extraordinary lifetimes as a result.



Heat Pipe Manufacturing Process


 

Heat Pipe Specifications
 
ItemsDescription
Wick Type (inner wall)Copper mesh
Cu powder sintering
Groove
Composite wick
                             
Cu powder sinteringGrooveComposite Wick (Groove + Powder)


ItemsDescription
Container MaterialCopper (JIS C1020)
CoolantDistilled, De-lonized Water
Methanol
Acetone
Pipe Diameter2 mm ~ 25.4 mm
Min. Thickness1.2 mm
Min. Bend RadiusØ6 -> R9 (1.5 times)
Allowable inclination Angle(At Top Heat Mode) 5° max
Allowable Operating Temperature-50°C ~ 200°C
Storage Humidity (%RH)5~90% RH
Storage Temperature (°C)5~60°C
Max. heat capacity5W~600W per single pipe
Surface FinishNi or Anti-Oxidation coating

ItemsDescription
Container MaterialCopper (JIS C1020)
CoolantDistilled, De-lonized Water
Methanol
Acetone
Pipe Diameter2 mm ~ 25.4 mm
Min. Thickness1.2 mm
Min. Bend RadiusØ6 -> R9 (1.5 times)
Allowable inclination Angle(At Top Heat Mode) 5° max
Allowable Operating Temperature-50°C ~ 200°C
Storage Humidity (%RH)5~90% RH
Storage Temperature (°C)5~60°C
Max. heat capacity5W~600W per single pipe
Surface FinishNi or Anti-Oxidation coating


Reliability Testing 
    A variety of heat pipe reliability testing items executed according to customer requirements