Heat pipes

The heat pipe is a unique device, invented early in the days of satellite space exploration. A heat source boils a heat transfer fluid, and a heat sink condenses the fluid back to its liquid state, liberating the energy transferred from the fluid's change of phase. The transfer fluid is contained inside a pipe; it provides both vapor transport and return of the condensate to boil again in a closed loop evaporation condensation cycle. Heat pipes have been successfully installed in laboratory heat recovery systems when the proximity of the supply and exhaust air streams can be closely arranged, and corrosion resistance of the heat pipe is assured. A benefit of a heat pipe system is that it recovers both heating and cooling energy passively without requiring energy use for pumps or motors. [Baker, 1997] [Industrial Ventilation: A Manual of Recommended Practice - 22nd Edition, 1995]

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