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As technology advances, a variety of products facilitate the life consequentially. Increasingly consumed energy becomes a major issue today, and energy saving subject is widely discussed. At present, the problem is that a variety of energy-saving products are too expensive to be accepted by masses. Taking the public works as the started target is a good ideal. Among those public works, the street lighting is in the first place that consumed the most energy, and the LED street lighting becomes the first candidate for implementing energy saving device. The thermal dissipation of the LED lamp is a headache problem. On the other hand, if we can collect this thermic energy to transfer into wind energy to rotate small wind generator, a double benefit is been created. A small wind generator mounted on the LED thermal dissipation plate is studied in this thesis. Started from a conceptual design, a Venturi tube is used to guiding the thermic through the Venturi pipe, so the thermal flow can rotate the wind generator. To enhance the pipe function, an outer hood is designed to form a flow field to conduct the heated wind. During the day time, the sun energy can also be collected to form a thermal channel that also goes through the Venturi tube. During the evening and night, LED is powered on, the dispelled heat can easily flow through the pipe. The simulation tools, such as AutoCad, ANSYS and Fluent CFD simulation software, are used to analyze the flow of thermal energy and wind energy. The finished work can successfully catch the heat and wind energy. We hope the designed energy saving device can run smoothly night and day.
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