內建馬達風扇與具垂直暨環向水平通氣孔道之LED散熱座之熱傳性能量測

本文研究「主動式LED散熱座之設計製作與熱傳性能量測」之設計與製作，其構想是開發一主動式散熱的LED燈具散熱器，利用小型馬達風扇，配合鋁合金散熱座之垂直通氣孔道、環向側面開口與隔板設計，達到混合對流冷卻效果，獲得更長的使用壽命。本文並以實驗方法量測不同模式之散熱座測試段的熱傳特性，散熱座以鋁合金製成，其基本構型為中空圓柱體具多個幅射排列徑向鰭片，中空圓柱體內可置入不同尺寸之馬達風扇，配合鋁合金散熱座之垂直通氣孔道、環向側面開口與隔板設計，達到混合對流冷卻效果。實驗結果指出，在加熱面溫度與環境溫度差值範圍為13－40℃之間時，不具馬達風扇但具孔道之模式的整體熱阻約是不具馬達風扇與任何孔道之模式的66%，具馬達風扇與孔道之模式的整體熱阻最小約僅是不具馬達風扇與任何孔道之模式約50%，而此最大熱傳增益是安裝4 cm × 4 cm馬達風扇或安裝5 cm × 5 cm馬達風扇的結果，但若是安裝3cm × 3 cm馬達風扇，其熱阻反而比不具馬達風扇但具孔道之模式的整體熱阻高約12%。

關鍵字

LED散熱座；馬達風扇；通氣孔道；熱傳；實驗

並列摘要

This work performed the design, manufacture and heat-transfer test of the active heat sink for LED lamps. The small motor fan was installed into the aluminum-alloy heat sink, coupling with the designs of air-flow passages and divider to obtain the mixed convection heat transfer and the long use life of LED lamp. This work experimentally investigated the heat transfer characteristics of various active heat sinks. The cylindrical heat sink, with many radial plate fins, was made of aluminum alloy. Different motor fans were selected to install into the chamber of the cylindrical heat sink. Coupling with the vertical and horizontal flow passages of the heat sink, the mixed convection cooling could be reached. The experimental results indicate that, at the temperature-difference range of 13-40℃, the thermal resistance of the heat sink with flow passages but without motor fan was lower than that without both flow passages and motor fan by 34%. When the motor fan was installed into the heat sink and being operating, the thermal resistance would be lower than that without both flow passages and motor fan by 50% at maximum. This maximum heat transfer enhancement was reached for the case with installing 4 cm × 4 cm or 5 cm × 5 cm motor fan. However, the installing 3 cm × 3 cm motor fan could not reduce the thermal resistance.

並列關鍵字

LED heat sink ； motor fan ； flow passages ； heat transfer ； experiment

國際替代計量

內建馬達風扇與具垂直暨環向水平通氣孔道之LED散熱座之熱傳性能量測

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