SOKAK AYDINLATMALARINDA KULLANILACAK YÜKSEK GÜÇLÜ LED'LERİN TERMAL PERFORMANSININ SAYISAL VE DENEYSEL OLARAK İNCELENMESİ

Bu çalışmada, sokak aydınlatmalarında kullanılan yüksek güçlü LED'lerinsoğutulması için ısı borulu soğutucu tasarımı yapılmıştır. Dört adet yüksek güçlüLED, dörtgensel alüminyum plaka üzerine yerleştirilmiş ve U şeklinde üç adetsilindirik bakır ısı borusu, alüminyum plakanın içinden geçecek şekilde monteedilmiştir. Isı borusunun ısıyı doğal taşınım ile dış ortama aktarabilmesi için, ısıborusunun yoğuşturucu bölgesine kanatçıklı soğutucu plaka yerleştirilmiştir.Tasarlanan sistemin termal analizi, nümerik olarak ANSYS Fluent yazılımındayapılmıştır. Analizlerde sırasıyla, 15 W, 20 W ve 25 W'lık elektriksel giriş güçlerininsistem sıcaklık dağılımına etkisi incelenmiştir. Buna ek olarak, sayısal analizlerde,çözüm metodu olarak farklı türbülans modeli ve duvar yaklaşımlarının sıcaklıkdağılımına etkisi de incelenmiştir. Sayısal çözümlerin doğrulanması için deneyselçalışma yapılmıştır. Sayısal ve deneysel sonuçlar birbiriyle uyumlu olduğugözlenmiştir.

NUMERICAL AND EXPERIMENTAL ANALYSIS OF THE THERMAL PERFORMANCE OF HIGH POWER LEDs TO BE USED FOR STREET LIGTHING

In this study, heat pipe - heat sink geometry was designed for cooling high power LEDs used in street lighting. Four high-power LEDs were placed on a rectangular aluminum plate and three U-shaped cylindrical copper heat pipes were mounted so that they will pass through aluminum plate. In order to transfer heat from heat pipe to the ambient by natural convection, a heat sink with fins was placed in the heat pipe condenser zone. Thermal analysis of the designed system was carried out numerically in ANSYS Fluent software. Analysis were performed for 15 W, 20 W and 25 W of electrical input power, respectively. In addition, the effects of different turbulence models and wall approaches on temperature distribution were also investigated. Experimental study was performed to verify numerical solutions. Numerical and experimental results were observed to be consistent.

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