Advanced Natural Convection Cooling Designs for Light-Emitting Diode Bulb Systems

摘要: The movement to light-emitting diode (LED) lighting systems worldwide is accelerating quickly as energy savings and reduction in hazardous materials increase importance. Government regulations rapidly lowering prices help further this trend. Today's strong drive replace light bulbs of common outputs (60 W, 75 100 W) without resorting compact fluorescent (CFL) containing mercury while maintaining the standard industry bulb size shape referred A19. For many designs, A19 restriction forces a small heat sink which barely capable dissipating for 60 W equivalent LED with natural convection today's efficacies. require larger sizes, some method forced cooling, or unusual liquid cooling system; generally none these approaches are desirable from consumer point view. Thus, there interest developing cooled designs LEDs that cool far more effectively than current designs. Current typically have thermal resistances 5–7 °C/W. This paper presents utilizing effects chimney well developed other fields reduce by significant amounts meeting all requirements system design. Numerical studies test data show performance 3–4 °C/W various orientations including methods keeping partially active horizontal orientations. Significant parameters also studied upon performance. simulations good agreement experimental data. Such chimney-based shown enable critical faster penetration into general applications.