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題名 | U型地埋管熱交換器出口溫度之預估=Outlet Temperature Prediction of U-shaped Ground Heat Exchangers |
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作者 | 梁乃文; 黃錦鐘; 吳春淵; 朱敏德; | 書刊名 | 東南學報 |
卷期 | 36 2011.07[民100.07] |
頁次 | 頁87-98 |
分類號 | 446.74 |
關鍵詞 | 地源熱泵; 熱阻; 無因次化; U型地埋管熱交換器; Ground source heat pump; Thermal resistance; Dimensionless; U-shaped ground heat-exchanger; UGHE; |
語文 | 中文(Chinese) |
中文摘要 | 地源熱泵之關鍵技術,在於地埋管熱交換器之熱傳性能,而性能之好壞會影響U 型地埋管熱交換器出口溫度之高低,因此在設計之初期就要先預估出口溫度之值,以為計算熱傳量之基礎。本研究利用有限長線熱源模型,求解鑽孔外之熱傳,亦即以此模型求解鑽孔壁面之溫度,而鑽孔內之熱傳則使用準三維熱導模式,以求得出口溫 度。本研究以無因次之方式求解,並繪製相關圖形以為求解U 型地埋管熱交換器出口溫度之方法,最後並探討各項變數對鑽孔壁面溫度和出口溫度之影響,並進一步探討熱回流之效應。本研究得到降低出口溫度之方法有:降低支管流量、增加鑽井深度、提高鑽井回填土之熱傳導係數、增加鑽井直徑等之結論。這些結論均與實際工程運用相符合。 |
英文摘要 | The key-technologies of ground source heat pump application decided by the heattransfer efficiency of U-shaped ground heat-exchanger (UGHE). Outlet temperature of UGHE is affected by heat transfer efficiency. In the first-stage of design, it should predict the outlet temperature of UGHE in order to calculate the amount of heat transfer. For the heat transfer outside of borehole, the study applied finite line-source model to calculate the wall temperature of borehole. Inside of borehole used the quasi-three dimension heat conduction model to calculate the outlet temperature of UGHE. The study used dimensionless analysis to solve the equations of energy and plotted the related figures for the solution of outlet temperature of UGHE. Finally, discussed the variables affect the outlet temperature of UGHE and the effect of heat flow-back. The methods of decreasing the outlet temperature of UGHEincluding: decreasing volume flow rate, increasing the depth of well, increasing the thermal conductivity of back-fill soil. These conclusions are consistent with actual engineering applications. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。