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標題: | 空氣/筏基水熱交換器應用於外氣空調箱之研究 Investigation of Air/Raft Foundation Water Heat Exchanger Applications to Air Handling Units |
作者: | Han Wang 王瀚 |
指導教授: | 陳希立 |
關鍵字: | 淺層溫能,空氣/筏基水熱交換器,外氣空調箱,預冷(熱), shallow geothermal energy,air/raft foundation water heat exchanger,air handling units,pre-cooling (pre-heating), |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 台灣地區夏季高溫高濕,空調的需求量極大,除了電費高昂外,對環境也造成很大的負擔,本研究參考前人利用淺層溫能之土壤-地埋管對外氣進行預冷處理,設法利用建築筏基內的消防筏基水對外氣進行夏季預冷或冬季預熱,利用純天然不耗能的淺層溫能對外氣進行預處理,使得夏季高溫高濕的外氣先經過降溫除濕,供給室內較低溫舒適的空氣。
本研究分別利用三種不同形式的能源進行空調箱預冷(熱)能力的探討,包括新型的地埋管熱交換器:空氣/筏基水熱交換器、直接抽取引自地下水的筏基水、以及結合外部製冷(熱)機(本文以熱泵為例)對系統進行預冷(熱),並經由水側及空氣側整合成五種不同模式,以宜蘭農舍為案例,經由能量平衡方程式並反覆迭帶計算後,夏季35°C,箱度濕度75%的外氣條件下,經由各種淺層溫能模式進行散熱,均可使出口溫度降低7°C以上,此外,以空氣/筏基水熱交換器進行夏季預冷,單位耗功下可產生8倍左右的熱交換能力,經預處理後的外氣可使室內空調節能效益至少有26.97%,至多甚至可超過52%。此外,使用空氣/筏基水熱交換器並抽取筏基水進行預冷時,可節約25.77%的耗電量,經計算在夏季運轉約36個月後可回收建置成本。 台灣地區冬季模式下,單位耗功產生的熱交換能力遠不如夏季,所有模式均不足3,且由空氣/筏基水熱交換器造成的預熱能力不足以將外氣預熱至舒適溫度,故需額外搭配熱源,對外氣進行加熱,方可使外氣達到舒適溫度。藉由案例分析可得知,淺層溫能的使用,能對外氣有效預冷,降低人們對空調系統的依賴,並降低室內空調的負荷,並達到節電的效益。 Taiwan is hot and humid in summer. The demand for air conditioning is great, which not only costs a lot, but also causes great environmental burden. To solve this problem, this study refers to previous thesis on the use of EAHE (Earth-air heat exchanger), on pre-cooling process, trying to use the air/raft foundation water heat exchanger, one of shallow geothermal energy for pre-cooling air in summer and pre-warming up air in winter so that the system will not result in extra energy consumption. This study use three different way to explore the capability of pre-cooling or pre-heating on Air Handling Units, inclusive of a new type of ground heat exchanger: air/raft foundation water heat exchanger, a direct draw from the raft foundation and a combination of pre-cooling in summer (pre-heating in winter) heat pump systems. And integrates into five different modes through water and air pipes. Take the farmhouse in Ilan as an example, the capacity of the heat exchanger could be obtained by the iteration calculation based on the energy balance equation. In summer , outdoor air in 35°C, RH75% .It can be found that under the use of those ways of Shallow Geothermal Energy, the temperature difference between outdoor air and outlet air is higher than 7 °C. On the other hand, the capacity of the heat exchanger on air/raft foundation water heat exchanger could be almost 8 times more than the power consumption. The indoor ventilation energy savings can reach about 26.97%, even up to 52% after the process of pretreating air. In addition, the use of the combination of air/raft foundation water heat exchanger and direct draw from the raft foundation pre-cooling, power consumption can save about 25.77%, and the payback period is about 36 months. In winter, the capacity of the heat exchanger is much less than summer, the capacity of the heat exchanger would be smaller than 3. Besides, the ability of the pre-heating caused by the air/raft foundation water heat exchanger is not enough to warm the outdoor air up to a comfortable temperature. So the heat exchanger has to combine with the heat pump system to make the outdoor air reach a comfortable temperature. From the analysis of this case, the application of the shallow geothermal energy can efficiently pre-cool the outdoor air, lower the reliance of the air conditioning, and reduce the load of the indoor air conditioning, ventilation and saving the electricity bill. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/54255 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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