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鄭澤明12

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鄭澤明, 曾憲中, 劉啟煌, 林東震

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具氣流驅動裝置與煙囪孔道之新穎LED 燈具散熱器之熱傳特性量測

Heat Transfer Measurements of the Novel Heat Sink with Air-Driving Device and Chimney Ducts for LED Lamp

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中國機械工程學會第三十屆全國學術研討會

Chinese Mechanical Engineering Society National Conference on the thirtieth

Keywords：LED燈具散熱器、馬達風扇、壓電風扇、煙囪孔道、強制對流、混核對流

Heat sink for LED lamp; motor fan: piezoelectric fan; chimney ducts; forced convection; mixed convection.

Abstract：本研究提出「據氣流驅動裝置與煙囪孔道之新穎LED燈具散熱器」之設計與製作，並以實驗方法量測不同模式之散熱座測試段的熱傳特性，散熱座以鋁合金屬製程，其基本結構為中空圓柱體具多個輻射排列徑向鰭片，中空圓柱體內可置入不同尺寸之馬達風扇或片狀葉片壓電風扇，配合鋁合金散熱座之煙囪孔道與隔板設計，達到強制對流冷卻效果，實驗結果指出，具馬達風扇之模式的整體熱阻比不具氣流驅動裝置之模式低於50~100%；內裝馬達風扇得散熱座的R值依然隋溫差ΔＴ而下降，表示熱傳機制為混合對流熱傳；4cm x 4cm馬達比5cm x 5cm馬達風扇獲得略佳之整體熱傳是有影響；最後，隔板若未能完整分隔散熱座內部中空腔體或煙囪孔道的開口設計不匹配壓電風扇都會使汽流驅動裝置無法發揮功用，無法增益整體熱傳。

This work proposed a novel heat sink with air-driving device and chimney ducts for LED lamp and experimentally investigated the heat transfer characteristics if various-model heat sinks. The heat sink, made of aluminum alloy, is a hollow circular cylinder with radially arranged arranged cooling fins. The piezoelectric fan or the motor fan is mounted in the container of the heat sink. Coupling with the chimney ducts and the partition in the heat sink, it can obtain the forced convection cooling effect. The experimental results indicate that the total thermal resistance (R) of the heat sink with a motor fan was 50~100% lower than that without any air-driving device. The R value of the heat transfer. Besides, 4cm×4cm motor fan enhanced slightly better heat transfer than 5cm×5cm one did. It demonstrates that the fit of the motor fan and the chimney ducts’ open ends did influence heat transfer. Finally, the heat transfer enhancement could not be obtained when the partition of the container in the heat sink was incomplete or the chimney ducts’ open ends did not fit the piezoelectric fan.