Abstract
Paper deal about testing of device with heat pipes and about research alternative possible applications of heat pipes and potential improvements in purpose effective heat sink from power switches of device. This device is used in various static and moveable applications. Testing device is part of control unit in rail vehicle. The amount of heat produced by power switches depend from working conditions of static converter. Great impact on heat sink has, how as season also this if the vehicle is moving or don't moving. If the vehicle is moving the heat transfer form energy converter to surrounding is caused by forced convection of air flow around device. But the critical conditions occur if the vehicle doesn't move, because the application of this cooling device is based on natural convection. The study deal solution of the problem heat transfer from energy converter to surrounding by natural convection.
Highlights
Paper deal about testing of device with heat pipes and about research alternative possible applications of heat pipes and potential improvements in purpose effective heat sink from power switches of device
The critical conditions occur if the vehicle doesn’t move, because the application of this cooling device is based on natural convection
From the time of heat pipe patent and with this join using the latent heat of substance to heat transfer by phase change in hermetic closed vacuum system, is whereby further more applications in praxis, which use two phase systems to heat transfer
Summary
At first was designed thermostatic chamber to testing of cooling device. The chamber is designed and constructed for simulation surrounding temperature conditions and must have a sufficient capacity for creating conditions for heat transfer by natural convection to simulate the adjustable and continuously stationary temperatures around cooling device. The cooler was constructed from six gravitational pipes filled with ethyl alcohol Their evaporation section is embedded into the aluminium block of the energy converter and on the condensation section are ribs connected vertically to the axis of the heat pipes. Head point testing of cooling device in thermostatic chamber is monitoring temperature on the aluminium block of energy converter, heat pipes and ribs at temperature condition 30 °C and various positions of device. At a higher tilt angle position of the ribbed cooler is cooled more intensively by natural convection but the return of the condensate to the evaporator section fail and that is reason why its overall ability of the heat transfer decreases. This claim confirms study about influence working position of wick heat pipe on their performance
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