冷卻水塔流場模擬分析

Airflow Simulation of A Cooling Tower

胡權峰(Chuan-Feng Hu)

指導教授 ： 施陽正

國立臺北科技大學/機電學院/能源與冷凍空調工程系碩士班/碩士(2009年)

摘要

冷卻水塔為一種透過熱傳及質傳的散熱元件，廣泛地運用在商用辦公大樓的空調冰水製造機之散熱系統，而冷卻水塔為一種排熱裝置，係使水與空氣接觸，而有部分水蒸發進入空氣，達到將水冷卻之目的的設備。由於散熱時需要大量外氣來冷卻水塔內的循環水，因此需要特別注意各水塔間距以提供足夠的外氣來冷卻；或可加高導風筒來減少熱回流率之影響。在本研究中，以計算流體力學評估冷卻水塔擺設間距及加高風筒對冷卻能力之影響，並紀錄不同風向對進出風之乾球與濕球溫度，以觀察擺設間距及加高風筒之熱回流率差異。根據數值模擬結果得知，調整冷卻水塔擺設間距及加高導風筒後確實能有效減少熱氣回流率以確保冷卻水塔散熱性能。

關鍵字

冷卻水塔 ； 熱回流率 ； 計算流體力學 ； 氣流模擬

並列摘要

Cooling tower is a component used for heat rejection by means of heat and mass transfer and it is widely employed in commercial office buildings. Through the contact of water and air, cooling tower can reach the purpose of discharging heat. During the process of discharging, it needs a large amount of outdoors air to cool down the recirculation water within the cooling tower. Therefore, increasing the installing spacing between cooling towers and the stack height can provide enough outdoor air to cool down the recirculation water. In this study, Computational Fluid Dynamics（CFD）method was adopted to investigate the impact of installing spacing and stack height on the thermal performance of cooling towers. According to the numerical results, it is known that increasing the installing spacing and stack height can effectually enhance the thermal performance of cooling towers.

並列關鍵字

Cooling ； Efficiency of thermal recirculation ； Computational Fluid Dynamics（CFD） ； Airflow simulation

參考文獻

[17]黃錦文，“冷卻水塔之熱流原理(上)，”中國冷凍空調雜誌，No.31，pp.118-133(1997.04)。

[18]黃錦文，“冷卻水塔之熱流原理(下)，”中國冷凍空調雜誌，No.32，pp.100-109(1997.06)。

[21]張峻銓，冰水主機與冷卻水塔群組最佳化運轉策略研究，碩士學位論文，國立臺灣大學機械工程學研究所，民96。

[4]Jorge F., Armando Co. ,”Thermal behavior of closed wet cooling towers for use with chilled ceilings.”, Appl. Therm. Eng., 20., pp. 1225-1236, 2000.

[6]Jameel-Ur-Rehman Khan,M. Yaqub,Syed M. Zubair, “A comprehensive design and performance evaluation study of counter flow wet cooling towers”.,Energy Conversion & Menagement, 44,pp. 2073-2091, 2004.