散熱鰭片與通氣孔對於三維機匣壁面陣列分佈凸塊熱源之散熱性能提升之研究

Cooling Performance Enhancement for Arrays of Block Heat Sources in 3-D Cabinets with Installation of Fins and Construction of Air Vents

楊致和(Chih-Ho Yang)

指導教授 ： 蔡永利

國立虎尾科技大學/工程學院/航空與電子科技研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00221

摘要

機匣安裝有間隔凸塊熱源之模組，其自然對流的熱傳問題，在現今的工程應用方面甚為廣泛，例如電子裝備利用自然對流方式冷卻，太陽能電池模組以及發光二極體產品之熱管理等。本研究旨在針對三維機匣壁面安裝有陣列分佈之間隔凸塊熱源，探討散熱鰭片與通氣孔對於凸塊熱源散熱性能提升的效應。本研究以數值方法進行嚴謹的模擬，計算區域包括機匣內部與外界環境，而機匣壁面溫度與熱通量並非已知，乃於求解過程中獲得。
本研究結果顯示，當Ax = 0.5、Az = 0.1、Bx = By = 0.1、Bz = 0.01、Ra =5 × 10^6、Kba = 5000、Kca = 600、Kfa= 8000，散熱鰭片數目FN=23時，其熱點溫度可減少28.47%；在Kca = 8000，壁面設置通氣孔徑SD=0.04、通氣孔數SN=16時，凸塊熱點溫度可降低9.97%；而同時安裝散熱鰭片與通氣孔，在Kca=600、Kfa=8000、FN=23、通氣孔數SN=6時，熱點溫度可減少35.42%。

關鍵字

三維機匣 ； 間隔凸塊熱源 ； 散熱鰭片 ； 通氣孔 ； 數值模擬

並列摘要

The multi-conjugate heat transfer for the discrete block heat sources is widely encountered in engineering applications, such as cooling of electronic equipments, photovoltaic cells and products of light emitting diode. This study aims to investigate the conjugate conduction－natural convection characteristics for block heat sources mounted on the wall in a 3-D closed cabinet. Attention is given to the enhancement of cooling performance by installing fin and constructing air vents. The numerical simulation is rigorously performed in this study. The numerical computation domain covers the cabinet and its surrounding area. The boundary conditions of the temperature and heat flux for cabinet wall are not previously known and have to be found in the solution processes.
Results show that, for the fin number FN=23, the hot spot temperature of the blocks can be reduced up to 28.47% as Ax = 0.5, Az = 0.1, Bx = By = 0.1, Bz=0.01, Ra =5 × 10^6, Kba=5000, Kca=600, Kfa = 8000. The hot spot temperature of the blocks can be reduced by 9.97% when cabinet wall constructing air vents with Kca=8000, SD=0.04, SN=16. The difference of hot spot temperature of the blocks is about 35.42% for Kca=600, Kfa=8000, FN=23, SD=0.04, SN =6 when the fins and air vents are combined.

並列關鍵字

3-D cabinet ； discrete heat sources ； fin ； air-vent ； numerical simulation

參考文獻

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