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博碩士論文 etd-0906112-171826 詳細資訊
Title page for etd-0906112-171826
論文名稱
Title
大型太陽能熱水系統儲熱槽之模擬研究
Numerical simulation of Large Solar Hot Water system in storage tank
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
125
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2012-07-06
繳交日期
Date of Submission
2012-09-06
關鍵字
Keywords
強制循環、數值模擬、儲存槽、隔板
Forced convection, Storage tank, Numerical simulation, Obstacle
統計
Statistics
本論文已被瀏覽 5667 次,被下載 246
The thesis/dissertation has been browsed 5667 times, has been downloaded 246 times.
中文摘要
大型太陽能熱水系統之儲熱槽之設計參數對系統效能之影響甚大,然而文獻有關儲熱槽之研究多數是單獨考慮儲水槽本身以及實際不易做到的熱分層之研究,實驗相關的研究參數又過於侷限,因此不足以提供廠商設計準則。因此本文以數值模擬方法研究大型太陽能熱水系統之儲熱槽在加裝多種形式隔板的情形下結合太陽能集熱系統之操作條件與運作情形求得系統之效能,以期能提供提升系統效能之方案。本文進行儲熱槽內部詳細三維熱流模擬,並結合太陽能熱水系統之整體運作模擬,來研究儲熱槽之設計參數對大型太陽能熱水系統效能之影響。以台灣三個代表性城市的氣象資料進行電腦模擬,計算太陽能所能提供每個月熱水需求的百分比,及整年所能提供熱水需求的百分比,也就是太陽能月負荷比(f)及每年負荷比(F)。
Abstract
This research is aimed to study the storage tank design parameters effects on the efficiency of the large solar hot water system. Detailed CFD simulation for the storage tank coupled with TRNSYS program simulation for the entire solar hot water system will be performed to study the system performance under various thermal stratification baffles design for the storage tank. The study is made for three representative cities of Taiwan by input their typical-meteorological-year data (TMY data). The results indicate the performance of a large solar hot water system can be significantly improved with proper designed thermal stratification baffles in the storage tank.
目次 Table of Contents
目錄................................................i
圖目錄...........................................iii
表目錄..........................................viii
摘要..............................................ix
Abstract.........................................x
符號說明.......................................xi
第一章 緒論..................................1
1-1.前言.........................................1
1-2.太陽能熱水系統簡述.................1
1-3.文獻回顧..................................2
1-4.研究方法和結構........................4
第二章 基礎理論............................6
2.1物理模型....................................6
2.2基本假設....................................6
2.3物理模型....................................6
2.4統御方程式(Governing Equation) ..7
2.5邊界條件....................................8
第三章 數值方法..........................13
3.1 模型格點測試..........................13
3.2數值方法..................................13
3.3離散化......................................13
3-4 速度修正方程式.......................15
3-5壓力修正方程式........................18
3-6 SIMPLE演算法.........................19
第四章 儲熱槽測試計算................24
4-1啟動溫差 之測試計算...............24
4-2 隔板之測試計算.......................25
4-3儲熱槽之不同熱水入口測試.......25
第五章 結果與討論........................47
5.1 不同隔板數影響下熱水進入儲熱槽的影響. 47
5.2不同隔板數影響下冷水進入儲熱槽影響......48
5.3 不同形式儲熱槽之系統模擬.......................49
5.4不同熱水入口儲熱槽和不同隔板之系統模擬49
第六章 結論與未來展望.................................107
6.1 結論.............................................107
6.2 未來展望......................................108
參考文獻........................................................109
參考文獻 References
[1] 經濟部能源局http://www.moea.gov.tw/
[2] Shahab Alizadeh, An experimental and numerical study of thermal stratification in a horizontal cylindrical solar storage tank,Solar Energy,Vol. 66,1999
[3] Louise Jivan Shah, Simon Furbo, Entrance effects in solar storage tanks, Solar Energy, Vol.75, 2003
[4] K. Johannes, G. Fraisse, G. Achard, G. Rusaouën, Comparison of solar water tank storage modelling solutions, Solar Energy, Vol.79, 2005
[5] Necdet Altuntop, Mevlut Arslan, Veysel Ozceyhan, Mehmet Kanoglu, Effect of obstacles on thermal stratification in hot water storage tanks, Applied Thermal Engineering, Vol.25, 2005
[6] Christian Inard, Lana Kenjo, Dominique Caccavelli, Experimental and numerical study of thermal stratification in a mantle tank of a solar domestic hot water system, Applied Thermal Engineering, Vol.27, 2007
[7] José Fernández-Seara, Francisco J., Jaime Sieres, Experimental analysis of a domestic electric hot water storage tank. Part II: dynamic mode of operation, Applied Thermal Engineering, Vol.27, 2007
[8] Simon Ievers, Wenxian Lin, Numerical simulation of three-dimensional flow dynamics in a hot water storage tank, Applied Energy, Vol.86, 2007
[9] R.Z.Wang, Y.M.Han, Y.J.Dai, Thermal stratification within the water tank, Renewable and Sustainable Energy Reviews, Vol.13, 2009
[10] Jinny Rhee, Andrew Campbell, Adele Mariadass, Branden Morhous, Temperature stratification from thermal diodes in solar hot water storage tank, Solar Energy, Vol.84, 2010
[11] A.A. Dehghan, A. Barzegar, Thermal performance behavior of a domestic hot water solar storage tank during consumption operation, Energy Conversion and Management, Vol.52,2011
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