Koaksiaalilämpöputki

A koaksiaalilämpöputki, also known as a coaxial heat pipe or concentric heat pipe, is a type of heat exchanger that utilizes two concentric pipes to transfer thermal energy. The inner pipe typically carries a working fluid, which evaporates and condenses to transport heat. The outer pipe serves as a casing and may contain another fluid or be used for structural purposes.

The principle of operation relies on the phase change of the working fluid. Heat is applied to one end of the inner pipe, causing the fluid to vaporize. This vapor then travels along the inner pipe to a cooler section, where it condenses back into a liquid, releasing the absorbed heat. The condensed liquid then returns to the hotter end, often through capillary action in a wick structure or by gravity, completing the cycle.

Koaksiaalilämpöputki designs can vary. In some configurations, the space between the inner and outer pipes is a vacuum, enhancing thermal insulation. In others, this annular space might contain a secondary working fluid or be filled with a material to provide structural support or further thermal management.

These devices are valued for their high thermal conductivity and passive operation, meaning they do not require external power to function once initiated. Their compact design and efficient heat transfer capabilities make them suitable for applications where space is limited and reliable thermal management is crucial. Examples include electronics cooling, spacecraft thermal control, and specialized industrial heating and cooling systems. The co-axial arrangement allows for effective heat transfer while maintaining a compact form factor.