本文主要分析水平擺放鰭片，在開放空間自然對流下鰭片各項影響因子之熱分析。以COMSOL套裝軟體及實驗數據量測，估算在自然對流環境下矩形鰭片在開放空間中之平均熱對流係數、熱損失評估。本文研究方法分成兩部分，於實驗部分為了確保所建立之實驗方式的可行性，本文從各項可能影響之因數。在實驗之前評估，確定實驗建立模型之可行性後，收集實驗得出的結果，利用EXCEL做回歸分析，分析可能影響之因素分析，建立經驗公式。根據其它文獻影響散熱鰭片之因素，不礙乎材料性質、流場環境、鰭片高度、鰭片間距、熱損失控制、鰭片厚度、鰭片擺放角度，而本文獻鰭片僅考慮材料性質、流場環境、鰭片高度、鰭片間距，其餘皆定義為常數值。
而綜合實驗與模擬研究結果顯示在長57mm、寬57mm鰭片基座下。並根據結論(1)可得，根據鰭片底部溫度量測，得出散熱面積較多的散熱鰭片其散熱效果較佳，但從結論(2)得出面積雖會影響散熱情況，但並非為單一影響之因素，最後再從結論(3)鰭片的相互比對，看出鰭片高度與間距為影響因素，推導經驗方程式需考量鰭片高度與間距。模擬分析上利用COMSOL軟體的建立，可有效得出非鰭片部分熱損失之比值與分析鰭片內部溫度分佈。

This article focuses on the fins which are placed horizontally. Under the conditions of open space and natural convection, various factors of fins are used to study their influences on the heat dissipation. In this paper, COMSOL software and experimentally measured data were used to estimate the average thermal convection coefficient and heat loss assessment of rectangular fins in the open space under natural convection. To ensure the feasibility of the experimental model established in the experimental section, this work evaluates the possible factors before the experiment and the influences of the chosen factors are analysed. The empirical formulas are established by using EXCEL to do the regression analysis. The factors affecting the cooling fins include material properties, flow field environment, fin height, fin spacing, fin thickness, fin placement angle, and so on. This study only considers the material nature, flow field environment, fin height and fin spacing.

[1]Jaluria,Y.,Natural Convection Heat and Mass Transfer,Pergamon Press, New York,1980.
[2]Gebhart,B.,Y.Jaluria,R.L.Mhajan,and.B.Sammakia,Buoyancy-Induced flows and Transort,Hemisph-ere Publishing,Washington,DC,1988.
[3]McAdms,W.H.,HeatTransmission,3rded.,McGraw-Hill,New York,1954.
[4]Warner,C.Y.,and V.S.Arpaci,Int.J.Heat Mass Transfer,11,397,1968.
[5] Bayley,F.J.,Proc.Inst.Mech.Eng.,169,361,1955.
[6]Leung CW, Probert SD. Heat-exchanger performance: effect of orientation. Applied Energy 1989.
[7]Leung CW, Probert SD. Heat-exchanger design: optimal length of an array of uniformaly spaced vertical rectangular fins protruding upward from a horizontal base 1988.
[8]Starner KE,McManus HN.An experimental investigation of free convection fin arrays. Trans ASME,J Heat Transfer 1963.
[9]T. E. Schmidt, “Heat trans fer calculations for extended surfaces, ” Refri.Eng., pp.351-357,1949.
[10]Andrea de Lieto Vollaro*, Stefano Grignaffini, Franco Gugliermetti Optimum design of vertical rectangular fin arrays Int. J. Therm. Sci. 1999.
[11]Statistics for Business and Economics (A Practical Approach), by D.R. Anderson, D.J. Sweeney, T.A. Williams, J-C. Chen 2006.
[12]Jaluria Y., Natural Convective Cooling of Electronic Equipment, in: Kakac et al., Natural Convection. Hemishere Publ. Corp.,1985.
[13]Bejan A., Sang W.L., Optimal geometry of convection cooled electronic package, in: Kakac S. et al., Cooling of electronic systems, Proceedings of NATO ASI, Kluwer Academic Publishers, 1994.
[14]J.R. Bodoia and J.F. Osterle,”The Development of free Convection Between Heated Vertical Plates,”Jouranal of Hreat Transfer, Trans. ASME,Series C,vol.84,1962.
[15]Churchill,S.W.,and H.H.S. Chu,Int.J. Heat Mass 　Transfer,18,1323,1975.
[16]Churchill,S.W.,”Free convection Around Immersed Bodyies,”in G.F.Hewitt,Exec.Ed., Heat Exchanger Design Handbook,Section 2.5.,Begell House,New York,2002.
[17]Ilker Tari,Mehdi Mehrtash,A correlation for natural convection heat transfer from inclined plate-finned heat sinks 2012.
[18]Filino Harahap, Daru Setio,Correlations for heat dissipation and natural convection heat-transfer from horizontally-based, vertically-finned arrays,Applied Thermal Engineering 2001.
[19]LeFrvre,E.J.,”Laminar Free Conection From a Vertical Plane Surface,”Proc.Ninth Int.Congr.AppL, Mech.,Brussels,Vol.4,168,1956.
[20]Goldstein,R.J.,E.M. Sparrow,J.Heat and D.C.Jones,Int.J.Heat Mass Transfer,16,1025,1973.