Bong-Min Song1, Bongtae Han1, Avram Bar-Cohen1, Rajdeep Sharma2, and Mehmet Arik3
1Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
2Lifing Technologies Laboratory, GE Global Research Center, Niskayuna, NY 12309, United States
3Thermal Systems Laboratory, GE Global Research Center, Niskayuna, NY 12309, United States
The lifetime of an actively-cooled light emitting diode (LED)-based luminaire is dependent not only on the junction temperature of LEDs, but also on the reliability of active cooling devices. We propose a novel hierarchical model to assess the lifetime of an actively cooled LED-based luminaire that can provide light output equivalent to a 100W incandescent lamp. After design considerations for LED-based luminaires with active cooling are discussed, the proposed model is described using component-level sub-physics-of-failure models. The model is implemented to predict the lifetime of a LED-based recessed down-light with synthetic jet cooling. The effects of the time-dependent performance degradation mechanisms of the active cooling device on the lifetime of the luminaire are also discussed.
Index Terms: Active cooling, junction temperature, LEDbased luminaire, light-emitting diode (LED), synthetic jet.
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