Abstract
This research work presents a comparative thermal performance assessment of the laminar flow cooling blocks produced for automotive headlight assembly using a high power Light Emitting Diode (LED) chip. A three-dimensional numerical model with conjugate heat transfer in solid and fluid domains was used. Laminar flow was considered in the present analysis. The validation of the numerical model was realized by using the measured data from the test rig. It was observed that substantial temperature variations were occurred around the LED chip owing to volumetric heat generation. The cooling board with lower height performs better thermal performance but higher pressure drop for the same mass flow rates. The cooling board with the finned cover plate performs better thermal performance but results in an increased pressure drop for the same mass flow rates. Increasing the power of the LED results in higher temperature values for the same mass flow rates. The junction temperature is highly dependent on the mass flow rates and LED power. It can be controlled by means of the mass flow rate of the coolant fluid. New Nusselt number correlations are proposed for laminar flow mini-channel liquid cooling block applications.
Highlights
Recent trends in lighting systems focus on low energy consumption, higher light quality and reliability, long operation life, variable color, and low environmental impact [1,2]
The purpose of this study is, firstly, to perform a detailed comparative thermal and hydraulic performance evaluation of the laminar flow cooling blocks used automotive headlight assembly combined with high power light-emitting diode (LED) chips, and secondly, to provide enough cooling to control the junction temperature of the LED under the maximum allowable value defined by the manufacturer
The height of the channel has a great effect on the pressure drop, the smaller height (H = 7 mm) cases result in significantly greater pressure drop values than the higher height (H = 9 mm) cases
Summary
Recent trends in lighting systems focus on low energy consumption, higher light quality and reliability, long operation life, variable color, and low environmental impact [1,2]. Since light-emitting diode (LED) lighting presents superior performance and application flexibility over traditional incandescent lighting systems, it has found a wide range of applications in the automotive industry [3,4]. In addition to low energy consumption and high lighting performance, other reasons for preferring the LED lighting systems are shorter response times and longer service life (up to 100,000 hours) than traditional ones [5,6]. High power LEDs provide higher quality light beam and brightness as well as to be the best solid-state light source enabling to realize the innovative ideas about lighting applications. Since the progress and recent innovations in LED lighting technology have shown a significant improvement in recent years, high power
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