藉由田口方法以優化靜置式熱交換器之設計參數

本研究的目標是在研究靜置式熱交換器的最佳設計參數，為了節約能源考量，將低溫排氣之冷能予以回收預冷引入之新鮮空氣，可減少空調設備調節新鮮空氣之負擔，本論文在不同參數的組合下，能使得在高溫出口溫度降低以利冷空氣回收利用。　　使用田口方法搭配ANSYS Fluent 做模擬分析，找到降低高溫出口溫度之組合參數，進而達到目的。並探討了幾個影響出口溫度之因子，初次優化改變的因子有：流道形狀、流道間距、入口材質、入口流速(V)；第二次優化因子有:三角形流道的角度、流道長度(L)、流道正反的型態。　　在初次模擬分析優化中以入口流速與流道幾何形狀對整體的影響較具貢獻，在優化過程中最佳因子組合為A1-B3-C2-D1，測得模擬高溫出口最小平均溫度為46.16 oC。　　第二次模擬分析優化中以流道長度與三角形流道的角度組合對整體的影響較具貢獻，優化過程中最佳因子組合為A1-B2-C2，測得模擬高溫出口最小平均溫度為43.52 oC。　　綜合兩次模擬分析，優化模擬分析後之設計較原始設計大約降低了4.96 oC

關鍵字

三角形流道；田口方法；靜置式熱交換器

並列摘要

The goal of this research is finding out the optimal geometry parameters of stationary heat exchanger. Considering energy saving and reducing the loading of air conditioning, the cryogenic energy is recycled from the indoor air to cool down the intake fresh air. The air temperature of hot-side exit can be reduced by well-designed geometry parameters in order to easily recycle and reuse the cryogenic energy. In this case, the software ANSYS Fluent and Taguchi method are used to simulates and analyze the stationary heat exchanger model to find out the parameters of reducing the temperature of hot jet, and discussions are made for the few factors which have influents with the temperature of jet. In the beginning of optimization factors are shape of channel, pitch of channel, material of entrance and inlet velocity. Second times, the factors are the angle of triangle channel, channel length and upward or downward configurations of channel. At the first time optimization, the factors of inlet velocity and shape of channel are the most influential contribution and we obtain an optimal factor combination is A1-B3-C2-D1, and get the minimum average temperature of hot jet is 46.16℃. Second times of optimization, the factors of channel length and the angle of triangle channel are the most influential contribution and we obtain an optimal factor combination is A1-B2-C2, and get the minimum average temperature of hot jet is 43.52℃. Combining these two times simulations and comparing with original design, the temperature reduction is 4.96℃.

並列關鍵字

Stationary Heat Exchanger ； Taguchi method ； Triangle channel

參考文獻

【4】詹士緯, “二行交錯排列之板鰭橢圓管熱交換器的熱傳特性研究,” 成功大學機械工程研究所碩士論文, 2012

【14】楊紹韡, “磁流變制動器效能分析,”中原大學機械工程學系碩士學位論文, 2013

【17】黃翔楷, “藉由田口方法以優化步階微流道散熱器之設計參數,”中原大學機械工程學系碩士學位論文, 2014

【1】 H.T. Chen, J.C. Chou, “Investigation of natural-convection heat transfer coefficient on a vertical square fin of finned-tube heat exchangers,” Int. J. Heat massTransfer, vol.49, pp.3034-3044, 2006.

【3】 R.S. Matos, J.V.C. Vargas, T.A. Laursen, A.Bejan, “Optimally staggered finned circular and elliptic tubes in forced convection,” Int. J. Heat Mass Transfer,vol.47,pp.1347-1359,2004.

國際替代計量

藉由田口方法以優化靜置式熱交換器之設計參數

全文下載

主題瀏覽