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thermosyphons and heat pipes are used to transport large amounts of heat over a particular distance by using a two-phase fluid inside a hollow pipe. the more widely used heat pipe uses a wicking structure to transport the liquid back to the hot end whereas a thermosyphon is a simple hollow tube that uses gravity.
the lack of a wicking structure makes the thermosyphon much less expensive than the traditional heat pipe. however, because of the integral role that gravity plays in the operation of the thermosyphon, it is only effective when the evaporator is below the condenser.
in this article we will focus only on the non-looped single tube, known as the thermosyphon pipe, with water as the working fluid.
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