創新型多孔牆面空調供風之氣流分佈及熱舒適研究

A Research on Air Distribution and Thermal Comfort for a Novel Porous Partition Cool Air System

官信良(Hsin-Liang Kuan)

指導教授 ： 蔡尤溪

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(2010年)

摘要

本研究探討多孔牆面空調供風，結合隔間牆為風道，做為大範圍供風，達到兼顧舒適和節能的要求。本研究分為實驗及CFD模擬兩部分，實驗是架構在一個全尺寸的多孔牆面供風空調系統，藉由改變開孔率、供風寬度及高度等，觀察空間溫度分佈情形；模擬則是探討大範圍供風不同回風口位置的影響，且改變供風溫度、熱源負荷及人員負荷等，與窗型供風比較分析0.9m高切面平均溫度，最後做熱舒適度分析。實驗結果發現，多孔牆面供風能均勻供風，且讓0.9m高切面溫度分佈均勻，但供風風速低、拋程短，所以無法供應較大空間之空調。而模擬結果得知，大範圍供風的回風口位置影響很大，當回風口在對面牆壁時，有導引氣流的功用，使得溫度分佈更均勻；且與窗型供風比較，0.9m高切面平均溫度相差1~4°C，即使增加2kW的熱源負荷或八人的人員負荷，大範圍供風在0.9m高切面依舊有較低的平均溫度；依熱舒適度而言，相同的熱舒適下，大範圍供風設定的供風溫度，可以比窗型供風高4°C。

關鍵字

多孔牆面 ； 計算流體力學(CFD) ； 溫度分佈 ； 熱舒適

並列摘要

The thesis is on a novel porous partition cool air system, which uses the partition walls for air distribution. Thermal comfort and energy saving are considered. Both experiment measurement and CFD simulation were conducted. A full-size porous partition cool air system with variable opening ratio, height and air supply rate was setup for observing the temperature distribution. The computer simulation was used to investigate the effects of supply air volume, return air location, supply air temperature, and the heat load. The air distribution characteristics are compared that of window type air-conditioner for 0.9m height level for thermal comfort. The results show that the porous partition can supply air with temperature well distributed at 0.9m height level. The slower air velocity and the short throw make this system suited for smaller room space. The simulation results show that the location of return air has a great influence on the performance with the return air located opposite to the supply as the better for more uniform temperature distribution. Compared to window type, the temperature difference is between 1~4°C at 0.9m height. Even for increasing heat of 2kW or eight occupant loads, this partition air supply system can provide lower average temperature. In terms of thermal comfort, the supply temperature for this partition system can be set 4°C higher than that of the window type for the same thermal comfort.

並列關鍵字

Porous partition ； Computational fluid dynamics (CFD) ； Temperature distribution ； Thermal comfort

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