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研究生:李國仲
研究生(外文):Kuo-Chung Lee
論文名稱:空氣簾流場模擬與節能效益研究
論文名稱(外文):THE STUDY OF ENERGY CONSERVATION AND FLOW FILED SIMULATION FOR AIR CURTAIN
指導教授:郭鴻森李基禎李基禎引用關係
指導教授(外文):Hong-Sen KouJi-Jen Lee
學位類別:碩士
校院名稱:大同大學
系所名稱:機械工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:95
語文別:中文
論文頁數:94
中文關鍵詞:空氣簾節能空調系統自動門便利商店氣流場溫度場
外文關鍵詞:AIR CURTAUNENERGY CONSERVATIONAIR-CONDITIONING SYSTEMconvenience storeflow fieldtemperature field
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自從計算機發展以來,由於計算速度不斷增快,計算成本可不斷降低,利用流體力學CFD軟體計算達成室內環境節能的例子越來越多,尤其在台灣能源百分之九十八以上仰賴進口。而近年來國內能源用量不斷增加,台電於夏季尖峰用電量更是屢創新高,節約能源及提昇能源效率為當務之急,如何應用CFD軟體來減少不必要的能源消耗為節能的重要課題。

本文利用商業CFD軟體PHOENICES分析模擬便利商店於店內門口處,在未裝空氣簾前與安裝空氣簾後室內氣流場與溫度流場的分佈,藉由氣流場與溫度流場模擬得出室內風速與溫度,進而得到便利商店內整體流量分佈與熱傳方向。再由現場量測所得到室內風速值及溫度值,藉由數值分析模擬,得知空氣簾風速強弱會影響室內空調系統耗能。當空氣簾風速太強時,所產生的簾幕氣流會與室內外氣流互相衝擊擾動,造成室內冷熱氣流混雜,影響購物環境舒適度;當空氣簾氣流風速太弱時,無法有效隔絕室外溫度侵襲室內所造成的溫度自然對流現象,節省室內空調耗能。

設置空氣簾,可維持室內冷(暖)氣效果,同時達到舒適的節能,若能與自動門的搭配,更可發揮空調系統效率。就實驗中模擬便利商店10.8m*6.8m*2.8m空間內,為開放式場所,在安裝空氣簾後,設定五種不同的風速,分別驗證節能效益。實驗得知當不安裝空氣簾時,冷氣流量損失為5.87 kW;在安裝空氣簾後風速設定為2m/s時,損失為3.47kW,節能效益達60% ~ 70%,因此得知在開放式場合的商店內加裝適當空氣簾後是可減少空調系統長時間的運轉,並循環調節溫度達到節能效果。
Since the invention of calculators, the speed of calculation continued to increase and calculation costs continued to decrease. Through fluid mechanics CFD software calculations, more successful examples of indoor environment energy conservation have been reported. In Taiwan, more than 98% of energy supplies rely on imports. As domestic power use continues to increase, the shortage of power supply from Taiwan Power Company repeatedly exists in summer. Therefore tasks of saving energy and raising efficiency become top priority. How to use CFD software applications for reducing unnecessary energy consumption is an important issue for conservation energy.

This text has adopted commercial CFD software PHOENICES analysis in simulating flow field and temperature field distribution inside the convenience store for entrance with air curtain. Through this simulation the indoor air velocity and temperature are attained, and get the overall flow distribution and heat conduction direction inside the convenience store. Through onsite measuring to indoor air velocity value and temperature value for using numerical analysis. It shows that air curtain wind velocity intensity indeed affects indoor air-conditioning system energy consumption. When air curtain wind velocity is too strong, outside air and inside air will be the air curtain current, causing mixed cold and hot air indoor and affecting shopping comfort. When air curtain velocity is too weak, it is impossible to isolate the outside air from causing natural convection heat transfer, and to reduce indoor air-conditioning energy consumption.

The installation of air curtain can maintain the effect on the heat (Coldness) of the air. At same time it improves the comfortableness and saving of energy. If an automatic door is available, better air-conditioning system efficiency is facilitated. Inside experimentally simulated the convenient store open space measuring of 10.8m*6.8m*2.8m, after installing air curtain, There are use 5 levels are set to monitor energy conservation result. The experiment shows that when the air curtain is not installed, cold air loss is 5.87 kW, after the air curtain is installed with wind velocity set at 2m/s, the cold air loss is 3.47kW. To benefit it s energy conservation is 60% ~ 70%. Therefore, it shows that installing appropriate air curtain inside an open-type of convenience store space helps reducing long-standing operation of the air-conditioning system, recycles and regulates the temperature to achieve energy conservation results.
TABLE OF CONTENTS
ENGLISH ABSTRACT....................................................I
CHINESE ABSTRACT..................................................III
ACKNOWLEDGEMENTS...................................................IV
TABLE OF CONTENTS...................................................V
LIST OF FIGURES..................................................VIII
LIST OF TABLES......................................................X
Chapter
I Introduction.....................................................1
1.1 Motivation..................................................1
1.2 Energy consumption in the convenience stores................2
1.2.1 The convenience store profile........................3
1.2.2 Store scale and total electricity power consumption..3
1.2.3 The convenience store facilities.....................5
1.2.4 Energy consumption factor for the convenience store
with air-conditioning system.........................5
1.3 Study motive and objective.................................8
1.4 Layout of body.............................................9
1.5 Literature Review..........................................9
II Theoretical Analysis............................................13
2.1 Problem stating............................................13
2.2 Basic Hypothesis...........................................14
2.3 Governing equation.........................................15
2.4 Boundary condition setting.................................18
III Numerical method and calculation process.......................25
3.1 Phoenics Structure.........................................25
3.2 Phoenics Application......................................27
3.3 Simplest Calculation Process...............................29
3.3.1 Simple Solution.....................................29
3.3.2 Simplest Solution...................................32
3-4 Relaxation coefficient and Convergence criteria............33
3.4.1 Relaxation coefficient..............................33
3.4.2 Convergent coefficient..............................35
IV Result and Discussion...........................................37
4.1 Flow field analysis........................................37
4.2 Temperature field analysis.................................40
V Conclusion and Recommendation....................................49
5.1 Conclusion.................................................49
5.2 Recommendation.............................................51
REFERENCES..........................................................53
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