| Summary: | 碩士 === 華梵大學 === 機電工程學系 === 102 === In comparison with the traditional incandescent light bulb, LED has a few benefits such as a better energy saving system, a brighter illumination as well as a longer usage. In addition, the LED light has remarkable environmental advantages; however, the heat problem limits the further development of the LED.
The purpose of this dissertation is to investigate the temperature and flow fields of LED light bulbs. A commercial LED light bulb, with model number of ASW-11W, is used as the base model. The original model has 28 curved fins while the other modified model has 28 straight fins. In addition to the fin’s shape difference, the number of fins is also reduced to 25 fins for each design in this study.
The objectives of the simulations are to analyze the temperature distribution and flow fields of the surrounding air and to understand the temperature phenomena of the solid structures. A computational fluid dynamics software, ANSYS Fluent, is utilized to simulate and analyze heat dissipation performance. The air velocity and temperature distributions are solved according to mass, momentum, and energy conservation equations for the fluid domain while the temperature field of the LED light bulb itself is calculated through conjugate heat transfer.
By using Computational Fluid Dynamics(CFD) to simulate the results, the temperature distribution of different models can be found and compared. The results show that the original 28 curved fins model possesses greater cooling effects compared with the 28 straight fins model. The reduction of the amount of fins, from 28 to 25, will also make the cooling effects less effective.
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