Heat transfer analysis on LED-board in closed environment

Sammanfattning

Motorcyclists are more often involved in accidents with severe harm or even fatal outcome compared to other road users. An experienced motorcycle driver is well familiar with the problem when the day light is reduced. The visibility is of course highly decreased. Allight International develops a light bulb that through a gyroscopic feature allows the light image to always be projected in the same axi-symmetric plane. The low beam head light usually accompanies the drivers movement when cornering, creating a black void ahead that leads to decreased vision. The light bulb has not yet been tested in a headlight and the LED is assumed to have high working temperature, which can lead to a shortened service life and technical errors due to the heat. By comparing empirical tests such as infrared camera and thermocouples on the prototype with theoretical tests such as computer aided design, finite element method, and computational fluid dynamics, a better understanding of how the model can be adapted to counteract the high temperature has achieved. Empirical analysis show that at a lower current of where the light bulb produces a brightness around the lower region of an automotive low beam headlight, the existing solution seems to work with the help of the fan creating forced convection. The improved and evaluated prototype, makes it possible to increase the current for the light bulb when more of the generated heat dissipates from the heat source.