Welcome to the World of Aavid Heat Pipes As a pioneer in heat pipe technology and their application, Aavid Thermalloy has developed a high quality manufacturing process to ensure long life and reliability in our heat pipes. Weve had over a decade of experience designing and fabricating heat pipes and heat pipe assemblies. Heat Pipes are great thermal energy transporters that use an evaporator and condenser in place of a solid conductor. While they dont dissipate heat themselves, heat pipes quickly move heat from one area of the heat pipe to another area. The aerospace industry has been the proving ground of heat pipe reliability, and has been used for decades in harsh and demanding environments. Applications Efficient Heat Transport Air Cooling Heat pipes are great at moving or spreading heat, especially when Improves conduction paths of heat away from devices embedded in a base plate. They can quickly move heat away from Extends thermal range of both natural and temperature sensitive devices to a place the heat can be dissipated. forced convection cooling Heat pipes can also be used to increase fin efficiency by moving heat Aavid HiContact heat pipe embedding directly to the cooler top portion of fins. Many types of applications process improves thermal transfer can benefit from heat pipes. Reduces overall cost and weight without increasing the volume in a base plate Aerospace applications Best passive cooling system with no moving parts Consumer Electronics (Desktops, notebooks) Small diameter heat pipe assemblies Servers provide greater thermal efficiency Telecommunication Large diameter heat pipe assemblies Motor Drives and Controllers transfer greater power loads UPS Transportation Large Diameter Assemblies Small Diameter Assemblies Hi-Contact USA EUROPE: ASIA +1-603-528-3400 +39-051-764011 +86-21-6115-2000 www.aavid.comDiscover the Potential Heat Pipes Have to Offer How do Heat Pipes Work A heat pipe is a closed evaporator-condenser system consisting of a sealed, hollow tube whose inside walls are lined with a capillary structure or wick. Thermodynamic working fluid, with substantial vapor pressure at the desired operating temperature, saturates the pores of the wick in a state of equilibrium between liquid and vapor. When heat is applied to the heat pipe, the liquid in This effective high thermal conductance helps maintain near the wick heats and evaporates. As the evaporating constant temperatures along the entire length of the pipe. fluid fills the heat pipe hollow center, it diffuses throughout its length. Attaching a heat sink to a portion of the heat pipe makes condensation take place at this point of heat transfer and Condensation of the vapor occurs wherever the establishes a vapor flow pattern. temperature is slightly below that of the evaporation area. As it condenses, the vapor gives up the heat it Capillary action within the wick returns the condensate to the acquired during evaporation. evaporator (heat source) and completes the operating cycle. Heat Pipe Cycle Evaporation Vapor Flow Impermeable Wall Porous Wick Cavity for Vapor Flow Condensation Liquid return through the wick Heat Addition Heat Rejection Evaporator Adiabatic Section Condenser The internal liquid absorbs thermal energy conducted Thermal energy is absorbed by the cooler heat pipe through the wall of the pipe and evaporates. region away from the heat source, where the vapor condenses back into liquid. The pressure forces this vapor away from the heated portion of the heat pipe to the cooler region(s). Capillary action from the wicking structure transports the liquid back to the area where evaporation occurs, starting the cycle again. USA EUROPE: ASIA +1-603-528-3400 +39-051-764011 +86-21-6115-2000 www.aavid.com +1-603-528-3400 +39-051-764011 +86-21-6115-2000 www.aavid.com