Abstract
In the development of lighting technologies, light emitting diode (LED) technology plays an important role due to its high efficiency. LED lightening is the future of indoor and outdoor illumination solutions that all around of the world there is a widespread transition to save energy and have better quality illumination via LED-based solutions. On other hand, cooling of high power LED is crucial factor to utilize LED in high performance. In addition, finned heat sink could not be efficient based on the its geometry and usage areas due to the powder, the rain and the muds effects. In this study, an un-finned heat sink LED armature consisting of aluminum sheet metal was designed using a computer-aided-design (CAD) program. Furthermore, manufacturing of the heat sinks from sheet metal plates with bending machines enables to increase variety of LED armatures cheaply according to design requirements. Then, the thermal analysis of the system was conducted for the case of natural heat convection under different electrical powers and ambient temperatures by a commercial finite element analysis (FEA) program: SolidWorks Simulation. As a result of the thermal analysis, the ultimate heat sink sizes were obtained to minimize junction temperature of LED. Finally, the experimental studies were carried out to verify the feasibility of numerical solutions that they were in good agreement.
Highlights
light emitting diode (LED) technology plays an important role due to its high efficiency
LED lightening can be considered as a leading energy-saving solid-state lightening segment when compared to the conventional sources such as incandescent, fluorescent and high-intensity discharge (HID) lamps
COB LEDs, which consist of multiple finite LED diodes on a single board surface, are preferred due to its compact size and high power capacity
Summary
LED technology plays an important role due to its high efficiency. Lightening is responsible for 19% of total electrical energy consumption all around world according to the Internal Energy Agency [1]. LED lightening can be considered as a leading energy-saving solid-state lightening segment when compared to the conventional sources such as incandescent, fluorescent and high-intensity discharge (HID) lamps. The most important portions of the LED are the semiconductor material and the light emitting chip. This chip consists of n-type and p-type semiconductor layers. Compared to other lighting elements LED has considerably less energy consumption; because, the other lighting elements emit light by the principle of electric discharge or the heating of tungsten filament. In the same luminous flux (2600 lumen), the electrical power consumptions of the incandescent, HID, fluorescent and LED lamps are 150, 100, 42 and 25 W, respectively [4]. The LEDs do not contain any harmful gases whereas halogen lamps cause harmful greenhouse gas emissions
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