台灣位於亞熱帶氣候地區，同時間太陽輻射強度高，許多建築物西曬牆在夏季午後常面臨太陽直接曝曬而導致室內悶熱的情況，因此需要長時間使用空調設備以維持室內舒適環境而造成耗能增加。
為了降低室內耗能，將原有的西曬牆外側加裝遮陽板以避免太陽的直接照射，並將遮陽板與西曬牆留有間隙形成自然對流之通風流道， 本文以模擬的方式改變流道的幾何形狀，分為平行、漸縮、突縮、漸擴、突擴與突縮與突擴混合形式來分析空氣的流動特性以及對牆體入熱量的影響，最後由層流模擬的結論得到突縮與突擴混合形式可提供最佳的節能效果，與無遮陽西曬牆相比可減少45.4％之入熱量。
由於遮陽板與西曬牆所形成的流道高度相當高，故考慮到真實情況，以紊流模擬來修正層流所得之參數結果，由模擬結論可得知因紊流的能量與動量傳遞較佳，因此在平行流道的例子與層流相比可多減少1.92％之入熱量。

【1】 經濟部能源局, "能源產業技術白皮書," 2012.
【2】 台灣綠色生產力基金會, "非生產性質行業能源查核年報,"
2011.
【3】 台灣綠色生產力基金會, "辦公大樓節約能源手冊," 2009.
【4】 內政部營建署, "建築技術規則."
【5】 國立成功大學建築系西拉雅研究室.
【6】 W. Beckman and J.A.Duffie"Solar Energy Engineering Thermal
Process". Wiley,1986.
【7】 E. K. Levy, "Optimum Plate Spacings for Laminar Natural
Convection Heat Transfer from Parallel Vertical Isothermal Flat
Plates," Journal of Heat Transfer, vol. 93, pp. 463-465, 1971.
【8】 A. Bar-Cohen and W. M. Rohsenow, "Thermally Optimum
Spacing of Vertical,Natural Convection Cooled, Parallel Plates,"
Journal of Heat Transfer, vol. 106, pp. 116-123, 1984.
【9】 E. M. Sparrow and L. F. A. Azevedo, "Vertical-channel natural
convection spanning between the fully-developed limit and the
single-plate boundary-layer limit," International Journal of Heat
and Mass Transfer, vol. 28, pp. 1847-1857, 1985.
【10】A. G. Fedorov and R. Viskanta, "Turbulent natural convection
heat transfer in an asymmetrically heated, vertical parallel-plate
channel," International Journal of Heat and Mass Transfer, vol.
40, pp. 3849-3860, 1997.
【11】T. Yilmaz and S. M. Fraser, "Turbulent natural convection in a
vertical parallel-plate channel with asymmetric heating,"
International Journal of Heat and Mass Transfer, vol. 50, pp.
2612-2623, 2007.
【12】N. Bianco,S. Nardini, "Numerical analysis of natural convection
in air in a vertical convergent channel with uniformly heated
conductive walls," International Communications in Heat and
Mass Transfer , pp. 758–769, 2005.
【13】G. Gan, "A parametric study of Trombe walls for passive cooling
of buildings," Energy and Buildings, vol. 27, pp. 37-43, 1998.
【14】 A. M. Rodrigues,A. Canha da Piedade,A. Lahellec,J.Y. Grandpeix, "Modelling natural convection in a heated vertical channel for room ventilation," Building and Environment, vol. 35, pp. 455-469, 2000.
【15】E. Bacharoudis, et al., "Study of the natural convection
phenomena inside a wall solar chimney with one wall adiabatic
and one wall under a heat flux," Applied Thermal Engineering,
vol. 27, pp. 2266-2275, 2007.
【16】H. Asan and Y. S. Sancaktar, "Effects of Wall's thermophysical
properties on time lag and decrement factor," Energy and
Buildings, vol. 28, pp. 159-166, 1998.
【17】H. Asan, "Effects of wall's insulation thickness and position on
time lag and decrement factor," Energy and Buildings, vol. 28,
pp. 299-305, 1998.
【18】ASHRAE handbook. Heating, ventilating, and air-conditioning
systems and applications. Atlanta, GA: The Society, 1987.
【19】B. Olesen, "Radiant floor cooling systems," ASHRAE
Journal, 2008.
【20】張劭瑋, "通風遮陽板應用於建築外牆的節能模擬分析,"國立
臺灣大學工學院機械工程學系碩士論文, 2010.