目前政府積極推廣再生能源，其中以太陽熱水器的使用最為普遍，但是由於台灣的地理位置，因而常會發生颱風這類自然災害，造成太陽熱水器設備上的損害。為了有效的降低太陽能熱水器之損害，除了加強太陽能熱水器結構上的強度之外，有效的降低太陽能熱水器之升力是本研究的主要目標。
本研究選擇市面上單集熱板太陽能熱水器為基礎，在考慮所使用低速風洞所能安裝及吹試風速之因素下，將模型尺寸製作為原尺寸之60%。其次，台灣的緯度約在 之間，因此在所有的實驗案例中，皆以集熱板之下平板面對氣流方向傾斜 為裝設角，並以抬高模型離地高度以及在模型後方加裝導流板為控制變因，利用水柱壓力量測及荷重元量測分析模型之壓力分佈與整體升力，並以流體可視化觀察來配合說明。
由實驗結果可知，抬高模型離地高度可減低集熱板靠近地面的壓力，而在模型後方加裝導流可減低集熱板前端之壓力。但就整體而言，以在太陽能熱水器後方加裝攻角(angle of attack)α= 之導流板可達最有效之風阻減低量。在導流板尺寸方面，導流板垂直於氣流方向之截面積愈大，模型所受之升力也就愈小，另外，綜合這兩種降低風阻的方法，發現將模型抬高離地10cm並且在模型後方加裝攻角為 尺寸為70*35*0.5cm之導流板，可使模型所受之升力更加降低。

Among various forms of renewable energy promoted by the government, solar water heater is most widely used in Taiwan. However, Taiwan is situated in the prevalent typhoon track in the northwestern Pacific. The severity of typhoon usually resulted in damage of solar water heaters. For promotion of solar water heaters in Taiwan, reduction of wind uplift of solar water heaters is essentially required.
Due to the limit of the employed wind tunnel, a 60% scaled commercial solar water heater model was adopted in the study. Since Taiwan is located in the latitudes between 22-25°, the solar collector was inclined at an angle of 25°. For reduction of wind uplift, a guiding plate was linked to the junction of the flat panel and the cylindrical tank. Tests of lifting model were also included. Effects of the orientation of the guiding plate and the incremental height of the model on the reduction of wind uplift are studied.
The experiments were conducted in a low speed wind tunnel. For the mean surface pressure measurements, a number of holes as pressure taps were drilled along both vertical and horizontal centerlines of upper and lower surfaces of the flat panel. Pipes were used to connect the U-shaped tubes to evaluate the pressure distributions. For the wind uplift measurements, four load cells with a JMC weight indicator were employed. The oily flow experiments were conducted for purpose of flow visualization.
It was shown that the pressure differences(∆P) between the upper and lower surfaces of the flat panel in the region close to the rear edge decreases with increasing height(∆H) from the ground, which results in the reduction of wind uplift. In contrast, the installment of guiding plate can reduce effectively the ∆P in the regions close to the front edge. Among the investigated orientation angles, the case with the attack angle(α) of 90° leads to the maximum reduction of wind uplift among the test cases. It was also observed that the larger the shadow area of guiding plate is, the smaller the wind uplift is. Finally, it is concluded that the case of the guiding plate of 75*35*0.5 cm with α = 90° and ∆H = 10cm yields the best performance in the study.

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