Heat sinks with heat pipes are used to remove heat from a concentrated source and transport it to a larger surface area to improve heat transfer and dissipation efficiency. it is required to remove heat from concentrated source immediately & transport to larger surface area to improve heat transfer and heat dissipation efficiency. Heat pipe are available in various diameter, length & various power handling capacities. Heat sinks with Heat pipe are used for handling power from 40W to multi kilowatt.
A heat pipe is a simple device that can quickly transfer heat from one point to another. It consists of a sealed copper container whose inner surfaces have a capillary wicking material. A heat pipe is similar to a thermo siphon. It differs from a thermo siphon by virtue of its ability to transport heat against gravity by an evaporation-condensation cycle with the help of porous capillaries that form the wick. The wick provides the capillary driving force to return the condensate to the evaporator. The quality and type of wick usually determines the performance of the heat pipe, for this is the heart of the product. Different types of wicks are used depending on the application for which the heat pipe is being used.
When heat is applied at any point along the surface of the heat pipe causes the liquid at that point to boil and enter a vapor state. When that happens, the liquid picks up the latent heat of vaporization. The gas, which then has a higher pressure, moves inside the sealed container to a colder location where it condenses. Thus, the gas gives up the latent heat of vaporization and moves heat from the input to the output end of the heat pipe.
Heat pipes have an effective thermal conductivity many thousands of times that of copper. The heat transfer or transport capacity of a heat pipe is specified by its “Axial Power Rating”. It is the energy moving axially along the pipe. The larger the heat pipe diameter, greater is the APR. Similarly, longer the heat pipe lesser is the APR. Heat pipes can be built in almost any size and shape.
Careful design can minimize the performance loss & better prediction of performance.
|Medium||Melting Point||Boiling Point||Operating Range|
|Water||0||100||30 to 200|
|Ammonia||-78||-33||-60 to 100|
|Methanol||-98||64||10 to 130|
|Ethanol||-112||78||0 to 130|
|Sodium||-98||892||600 to 1200|
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