冷卻水塔是現今工商業常用之熱交換設備，從一般商業空調系統到大型製造工業製程相關冷卻系統，都可以看到冷卻水塔在其中扮演重要的角色。其原理是利用兩種流體，分別為水和空氣直接的接觸，於接觸過程透過蒸發、對流及熱傳導等機制來進行熱交換，使其達到熱能傳遞的目的。在整個熱交換的過程中，散熱風量對冷卻水塔的熱交換量有著直接的關係，而散熱風量的大小則取決於冷卻水塔散熱風扇葉片的相關條件，如何以既有風扇翼型條件，找出最大風量之風扇葉片攻角，提升冷卻水塔散熱風量，進而降低冷卻水溫度來達到冰水系統之節能，將是以相對簡單的方式來進行既有系統節能的改善方式，而且成本相對較低廉，可提升一般公司企業願意進行改善之意願。
本研究利用計算流體力學進行分析，探討風扇葉片不同位置在不同攻角的狀態下，其升力及阻力之影響。本文將冷卻水塔散熱風扇葉片，由風扇葉片翼根至翼尖均分7處，其距離冷卻水塔中心分別為60cm、120、180cm、240cm、300cm、360cm及420cm，透過改變每一處冷卻水塔散熱風扇葉片攻角的大小由0˚至-30˚，來觀察流場分佈、壓力分佈及阻力分佈，並分析各處最大升力之攻角及扭轉角所組成的風扇葉片角度，以及不同風扇葉片角度組成之差異，本研究之成果期可做為未來冷卻水塔風扇葉片攻角調整節能之參考。

Cooling towers are commonly used as heat exchange equipment in today's industry and commerce. From commercial air-conditioning systems to large-scale manufacturing process-related cooling systems, cooling towers can be seen to play an important role in them. The principle is to use two fluids, namely water and air, to come into direct contact, in the contact process through evaporation, convection and heat conduction mechanism to carry out heat exchange, so that it achieves the purpose of heat transfer. During the entire heat exchange process, the cooling air volume is directly related to the heat exchange volume of the cooling tower, and the size of the cooling air volume depends on the relevant conditions of the cooling fan blades of the cooling tower. How to find the fan blade of attack angle with the maximum airflow under the existing fan wing conditions, to increase the cooling airflow of the cooling tower, and then reduce the temperature of the cooling water to achieve the energy saving of the chiller water system is a relatively simple way to improve the energy saving of the existing system. It is also relatively inexpensive and can increase the willingness of companies to make improvements.
This study utilizes computational fluid dynamics to analyze and explore the effects of lift force and drag force at different positions of the fan blades at different attack angles. In this paper, the cooling fan blades of a cooling tower are divided into 7 places from the root to tip of the fan blades, and their distances from the center of the cooling tower are 60cm, 120cm, 180cm, 240cm, 300cm, 360cm, and 420cm, respectively. By changing the attack angle of each cooling fan blade from 0˚ to -30˚ at cooling tower, the flow field distribution, pressure distribution and drag force distribution are observed, and analyze the fan blade angle and twist angle composed of the attack angle of the maximum lift force at each place, as well as the difference in the composition of different fan blade angles. The results of this study can be used as a reference for future cooling tower adjustments attack angle of fan blade to save energy.

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