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

Öz

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

Anahtar Kelimeler

• LED,Isı Borusu,ANSYS,Türbülans Modeli

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

Öz

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.

Anahtar Kelimeler

• LED,Heat Pipe,ANSYS,Turbulence Model

Kaynakça

1. Ashish, R., Chaudhari, Bhosale, S.Y., 2016. CFD Validation and Experimental Investigation of Circular Heat Pipe Using Hybrid Nanofluid,International Journal of Innovative Research in Science, Engineering and Technology, 5, 9, 16058-16064.
2. Asmaie, L., Haghshenasfard, M., Mehrabani-Zeinabad, A., Esfahany, M.N., 2013. Thermal Performance Analysis of Nanofluids in a Thermosyphon Heat Pipe Using Cfd Modeling, Heat and Mass Transfer, 49, 5, 667-678.
3. Cai, Y., Li, Z., Zhai, J., Tang, Y., Yu, B., 2017. Experimental İnvestigation On a Novel Multi-Branch Heat Pipe for Multi-Heat Source Electronics, International Journal of Heat and Mass Transfer, 104, 467-477.
4. Dev, K., Budania, B., 2016. Simulation and Modeling Of Heat Pipe, International Journal of Technical Research, 5,1.
5. Elnaggar, M. H., Abdullah, M. Z., Mujeebu, M. A. 2011. Experimental analysis and FEM simulation of finned U-shape multi heat pipe for desktop PC cooling, Energy Conversion and Management, 52(8-9), 2937,2944.
6. Elnaggar, M., 2013. The Effect Of Thickness and Permeability of Wick Structure on L-Shape Heat Pipe Performance Using Different Working Fluids, Frontiers in Heat Pipes (FHP), 3, 4.
7. Gwinn, J.P., Webb, R.L., 2003. Performance and Testing of Thermal Interface Materials, Microelectron Journal, 34, 215–22.
8. Huang, D. S., Chen, T. C., Tsai, L. T., Lin, M. T., 2019. Design of Fins with a Grooved Heat Pipe for Dissipation of Heat From High-Powered Automotive LED Headlights, Energy Conversion and Management, 180, 550-558.

9. Kline, S.J., 1985. The Purposes Of Uncertainty Analysis, Journal of Fluids Engineerings, 107, 2, 153–160.
10. Lin, Z., Wang, S., Shirakashi, R., Zhang, L.W., 2013. Simulation of a Miniature Oscillating Heat Pipe in Bottom Heating Mode Using Cfd with Unsteady Modeling, International Journal of Heat and Mass Transfer, 57, 2, 642-656.
11. Moon, S. H., Park, Y. W.,Yang, H. M.,2016. A Single Unit Cooling Fins Aluminum Flat Heat Pipe for 100 W Socket Type COB LED Lamp, Applied Thermal Engineering, 126, 1164-1169.
12. Naveenkumar, C., Kumar, P.V., Kumar, K.D., 2015. Simulation and CFD Analysis of Heat Pipe With Different Wick Geometry Using CFX, International Journal of Thermal Technologies, 5, 3, 210-213.
13. Pimputkar, S.,Speck, J.S., Denbaars, S.P., Nakamura, S., 2009. Prospects for Led Lighting, Nat. Photonics,2,180-182.
14. Schelling, P.K., Shi, L., Goodson, K. E.,2005. Managing Heat for Electronics, Materials Today, 8, 6, 30-35.
15. Schmid, G., Huang, Z.L., Yang, T.H., Chen, S.L., 2017. Numerical Analysis of a Vertical Double-Pipe Single-Flow Heat Exchanger Applied in an Active Cooling System for High-Power Led Street Lights, Applied Energy, 195, 426-438.
16. Suresh, Z.V., Bhramara, B., 2016. Cfd Analysis of Single Turn Pulsating Heat Pipe, International Journal Of Scientific And Engineering Research, 7, 6, 238-244.
17. Tang, Y., Ding, X., Li, Z., Li, B., 2014. A High Power Led Device with Chips Directly Mounted on Heat Pipes, Applied Thermal Engineering, 66, 632-639.
18. Wang, J. C., 2014. U-and L-shaped heat pipes heat sinks for cooling electronic components employed a least square smoothing method, Microelectronics Reliability, 54(6-7), 1344,1354.
19. Wang, M., Tao, H., Sun, Z., Zhang, C., 2017. The Development and Performance of the High Power Led Radiator, International Journal Of Thermal Sciences, 113, 65-72.
20. URL-1< https://www.lumileds.com/uploads/419/ DS115-pdf/>: (Erişim tarihi: 12.02.2019).