Military and commercial designers of heatpipes turn to copper heat
pipes that use water as the working fluid for superior power density
capacity. The choice is made without regard to gravity or orientation.
The copper heat pipes are specifically designed for thermal challenges presented by gravity or high-heat loads.
Long
life and reliability are critical. The copper heat pipes have a wick
structure made of sintered copper powder that flawlessly operates
against gravity and is tough enough to withstand temperatures from -55° C
to 180° C and numerous freeze-thaw cycles.
With water as the
working fluid, heat moves smoothly through the heatpipes from its source
to the point where it is effectively managed through air or liquid
dissipation or radiated to space. The heatpipes are integrated into a
cold plate or heat sink to improve efficiency and conductivity.
The
overall system performance is improved. The integration is accomplished
through mechanical, solder, or epoxy interference. Copper heat pipes
can last over 20 years. Copper heat pipes transfer heat more evenly than
solid copper because they total thermal resistance is lower.
Both
planar and cylindrical heatpipe variants have inner surfaces lined with
capillary wicking material. Copper heat pipes are extremely effective
in high-thermal conductivity. Solid copper conductivity ranges somewhere
between 250 to 1500 Watts per meter Kelvin. Heatpipes range from 5000
to 200,000 W/m.K.
A small quantity of water fills the heatpipes.
Vaporizing water absorbs the heat. Heat is transported by the vapor to
the condenser region. There, the condensed vapor releases the heat to a
cooling medium. The condensed water returns to the evaporator by gravity
or the heatpipe wick structure. Capillary action is created.
A
liquid-vapor phase change occurs in two-phase heat transfer. Passive
capillary driven heatpipes are the most common of two-phase systems.
Passive two-phase heat transfer devices have been designed, developed,
and manufactured since 1970.
For further details about heatpipes and copper heat pipes please visit the website.
No comments:
Post a Comment