- 學位論文
高功率LED天井燈散熱設計之數值分析
Numerical Thermal Analysis for Design of High Power LED Bay Light
摘要
本研究在考慮材料重量及製造工法的情況下，利用計算流體力學的方法計算高功率LED散熱模組於自然對流中的熱流情形，搭配實驗量測來驗證，接著將燈具功率由120W提升至240W。為了將燈具Ts溫度控制在75℃以下，進而設計一新散熱模組。首先分析原型模組之散熱優勢及缺點，之後改變模組參數、形狀、利用煙囪效應、均溫板及熱管來設計新型模組。研究中之參數包含模組對流孔位置、底板厚度、散熱鰭片形狀、煙囪型鰭片高度、厚度、直徑、不同材料及傳導面積之均溫板、熱管及熱管冷凝端鰭片面積。實驗結果顯示， LED電熱轉換效率範圍介於75~85%，因數值設定範圍較廣，導致溫度有所差異，但實驗與模擬之溫度具有相同趨勢。模擬結果發現，原型模組散熱鰭片的設計不良，且底板厚度不足，使得熱能無法均勻傳遞至鰭片。然而煙囪型鰭片能有效提高模組的散熱效率，最後搭配熱管的應用，使得Ts溫度降低至74℃。
並列摘要
In this study, using CFD to investigate the thermal module of High Power LED Bay Light under the situation of considering weight of material and manufacturing method, with experimental measurements to verify, and then the lamp power increased from 120W to 240W. In order to control the temperature of the lamp Ts below 75℃, a new cooling module is designed. The first was to analyze the advantages and disadvantages of the prototype module, and then change the module parameters, shape, using a chimney effect, the average temperature plate and heat pipes to design a new module. The parameters of the study contains modules convection hole location, base plate thickness, fin shape, chimney-type fin height, thickness, diameter, different materials and conduction area of average temperature plates, heat pipes and condensing side fin area. Experimental results show that LED electric conversion efficiency ranges from 75 to 85%, The result brought out various temperatures because of a wide range of set values, but the temperature of the experiment and simulation have the same trend.Simulation results show that poor design of the prototype module heat sink, and the thickness of the base plate is not enough, so that heat can not be delivered to the fins uniform. However chimney-type fins can improve the cooling efficiency of the module, and finally with the application of heat pipes, make Ts temperature was lowered to 74 ℃.