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DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 陳希立 | |
dc.contributor.author | Hsin-Yao Huang | en |
dc.contributor.author | 黃新堯 | zh_TW |
dc.date.accessioned | 2021-06-16T02:30:22Z | - |
dc.date.available | 2020-08-25 | |
dc.date.copyright | 2015-08-25 | |
dc.date.issued | 2015 | |
dc.date.submitted | 2015-07-30 | |
dc.identifier.citation | [ 1 ] D.A. Ball, R.D. Fischer, and D.L. Hodgett, “Design methods for ground-
source heat pumps,”ASHRAE Transactions, Vol.89, No.2, pp.416–440, 1983 [ 2 ] Mitchell and Myers, 1968 Mitchell, J.W., Myers G.E., 1968. An analytical model of the countercurrent heat exchange phenomena. Biophysics Journal 8, 897–911. [ 3 ] Y. Gu, D.L. O’neal, 'Development of an equivalent diameter expression for vertical U-tubes used in ground-coupled heat pumps,' ASHRAE Transactions, Vol.104, pp.347–355, 1998 [ 4 ] M.L. Allan, 'Materials characterization of superplasticized cement–sand grout,' Cement and Concrete Research, Vol.30, pp.937–942, 2000 [ 5 ] 莊迎春,孫友宏,謝康和,'直埋閉式地源熱泵回填土性能研究,'太陽能 學報, Vol.25, No.2, pp.216–220, 2004 [ 6 ] C. Lee, M. Park,T.B. Nguyen, B. Sohn, J.M. Choi, H. Choi, 'Performance evaluation of closed-loop vertical ground heat exchangers by conducting in- situ thermal response tests,' Renewable Energy, In Press, Corrected Proof. [ 7 ] Ingersoll, L.R., et al. 1951. Theory of earth heat exchangers for the heat pump. ASHVE Transactions 57:167-188. [ 8 ] Deerman, J.D. and S.P. Kavanaugh, 1991. Simulation of vertical U-tube ground-coupled heat pump systems using cylindrical heat source solution. ASHRAE Transactions, 97(1): 287-295. [ 9 ] Teppo Arola, Lari Eskola, Jukka Hellen and Kirsti Korkka-Niemi. Mapping the low enthalpy geothermal potential of shallow Quaternary aquifers in Finland. Arola et al. Geothermal Energy 2014, 2:9 [ 10 ] Larry W. Mays. Ground and Surface Water Hydrology, 2012 [ 11 ] 李清白, 地下水湧水量之計算步驟及圖解法, 台灣水利出版委員會, 水井˙地下水(上) P.279 [ 12 ] Heiko T. Liebel, Saqib Javed, Gunnar Vistnes, Multi-injection rate thermal response test with forced convection in a groundwater-filled borehole in hard rock, Renewable Energy 48(2012) 263-268 [ 13 ] G. Florides, S. Kalogirou, “First in situ determination of the thermal performance of a U-pipe borehole heat exchanger, in Cyprus,” Applied Thermal Engineering, vol. 28, pp. 157-163, 2008. [ 14 ] H. Esen, M. Inalli, “In-situ thermal response test for ground source heat pump system in Elazig , Turkey,” Energy and Building, vol. 41, pp. 395-401, 2009. [ 15 ] Signorelli S 2004 Geoscientific investigations for the use of shallow low-enthalpy systems PhD Thesis Swiss Federal Institute of Technology, Zぴurich [ 16 ] Roland Wagner and Christoph Clauser, Evaluating thermal response tests using parameter estimation for thermal conductivity and thermal capacity, J. Geophys. Eng. 2(2005) 349-356 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/53814 | - |
dc.description.abstract | 隨再生能源的興起,淺層溫能之應用被視為有效的節能方法。淺層地表之溫度相較於地表附近環境溫度,溫度變化較小,其熱容量相當可觀。本研究於地表鑽孔,至地表下深度25m,並埋置U型之PVC管做為熱交換器。管內以水做為工作流體,可將VRF、熱泵…等之冷或熱帶走,與地下水隔PVC管做熱交換。
本研究著重於當對U型管外抽水,井內強制對流對系統性能的助益。以殼管式熱交換器模型之雷諾數Re為基礎,分析其與U型管外部熱對流係數h_o之關係。同時,由於有上述所言對井內抽水之設計,為避免抽水流率過大,造成井內水面不斷下降,或使得熱交換器與地下水接觸的面積減少過多,分析井內地下水因抽水造成之遞降曲線有其必要性。 最後,在本研究的實驗之中,抽出水跟補注水的溫差可達0.7℃,向井外抽水在流量20LPM時帶走了熱源輸入C.V.中熱能達38%。此外,與未使用管外抽水系統做比較,系統因管外抽水系統減省了21%的鑽井深度。而Re與h_o之關係趨勢線採乘冪形式,為h_o=114.81〖Re〗^0.1876。 | zh_TW |
dc.description.abstract | Shallow geothermal Energy has been considered an effective way to save energy as renewable energy becomes popular. The thermal capacity of shallow earth is considerable. Its change of temperature is small relative to the surrounding temperature above the ground. A borehole is drilled in the experiment of this study in a depth of 25 meters, and U-type PVC tubes are placed as heat exchanger. Water as the work fluid can exchange heat with groundwater and facilities like heat pumps or VRFs.
This study focuses on the efficiency improvement because of some forced convection in the well. Definition of Reynolds number in Kern Method is adopted to show the relation between the forced convection and the convection coefficient outside the U tube. Meanwhile, to avoid excessive pumping, analyzing the dropping curve because of pumping is necessary. Last, in the experiment of this study, the temperature difference of extracted water and compensating water reached 0.7℃, while 38% of injected energy is carried away because of the pumping system. Besides, compared with the system with no pumping, this system reduced the required borehole length to21%, and the relation between Re and h_o is h_o=114.81〖Re〗^0.1876。 | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T02:30:22Z (GMT). No. of bitstreams: 1 ntu-104-R02522320-1.pdf: 2041617 bytes, checksum: 277ca427cb5d188cf46be9c8cd4d5866 (MD5) Previous issue date: 2015 | en |
dc.description.tableofcontents | 摘要 I
Abstract II 目錄 IV 圖目錄 VI 表目錄 VIII 符號說明 IX 第一章 緒論 1 1.1 淺層溫能 1 1.2 U型地埋管熱交換器 2 1.3 文獻回顧 3 1.4 研究動機與目的 6 第二章 基礎理論 7 2.1 單位時間地下水湧水量分析 7 2.2 殼管式熱交換器 9 2.3 線熱源模型 11 第三章 研究及實驗方法 14 3.1 理論 14 3.1.1 能量守恆分析 14 3.1.2 U型管熱交換器分析 15 3.2 系統簡介 16 3.3 實驗設備及量測儀器 18 3.4 實驗規劃 21 3.5 實驗流程 22 第四章 結果與討論 25 4.1 U型管外水流量對性能之影響 25 4.2 U型管內水流量對系統性能之影響 27 4.3 不同熱源對操作溫度之影響 28 4.4 實驗與模型之外部熱對流係數ho比較 29 第五章 結論與建議 30 5.1 結論 30 5.2 建議 30 參考文獻 31 | |
dc.language.iso | zh-TW | |
dc.title | U型地埋管熱交換器在外部強制對流下之性能增益研究 | zh_TW |
dc.title | Performance Study on U Tube Bore Hole Heat Exchanger with Forced Convection in a Groundwater-filled Borehole | en |
dc.type | Thesis | |
dc.date.schoolyear | 103-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃振康,江沅晉,李文興 | |
dc.subject.keyword | 淺層溫能,U型地下水熱交換器,強制對流,殼管式熱交換器,地下水補注, | zh_TW |
dc.subject.keyword | Shallow Geothermal Energy,U Tube Bore Hole Heat Exchanger,Forced Convection,Shell and Tube Heat Exchanger,Groundwater Recharge, | en |
dc.relation.page | 32 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2015-07-31 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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