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研究生：	譚傲卡 Tanuwijaya, Abednego Oscar
論文名稱：	具相變化微膠囊層光電模組之熱/電性能數值模擬 Numerical Simulation on Thermal/Electrical Performance of a Photovoltaic Module Integrated with Microencapsulated Phase Change Material Layer
指導教授：	何清政 Ho, Ching-Jenq
學位類別：	碩士 Master
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
論文出版年：	2011
畢業學年度：	99
語文別：	英文
論文頁數：	71
中文關鍵詞：	太陽能光電、含相變化微膠囊
外文關鍵詞：	Microencapsulated phase change material, Thermal management, Solar Photovoltaic
相關次數：	點閱：160 下載：2
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近年來，太陽能光電科技因對尋找合適的再生能源的急迫需求而快速發展。而在實際應用上為了保持PV模組最大的光電轉換效率，PV模組的工作溫度最好維持在25oC附近，甚至更低。因此，本次研究建立了一個數值模擬的程式，來研究探討在不同的天候操作情況下，將PV模組背面貼附一內含相變化微膠囊(microencapsulated phase change material-MEPCM)之夾層，用以作為被動式溫控裝置的效益為何。而研究中則針對戶內外環境溫度、每日輻射日照量、MEPCM夾層厚度和相變化材料融點等參數對PV模組在熱電方面的效能影響作探討。這個模擬用三種的操作條件（夏天的-Ra = 7.5 x 108，冬天的-Ra = 5.2 x 108，正常的-Ra = 6.95 x 108），MEPCM兩個熔化溫度(26跟34oC)，MEPCM兩個寛高比(0.277 跟1)。而根據模擬所得的結果顯示，相變化材料之融點溫度與夾層的高寬比對PV模組之熱電效應有顯著的影響。

Recently, the solar photovoltaic (PV) application technology grows rapidly with the urgent need for seeking sustainable and renewable energy sources. To retain the maximum electrical conversion efficiency for practical applications, the PV module should be operated at a temperature preferably lower than or around 25oC. In this context, the present study via a numerical simulation aims to explore efficacy of using a microencapsulated phase change material (MEPCM) layer as a passive thermal management medium for a PV module under various daily operation conditions. Parametric simulations have been performed for the thermal/electrical performances of the PV module under three different operation conditions with twodifferent aspect ratios of 0.277 and 1of the MEPCM layer with two different melting points at 26 and 34oC, respectively. The numerical simulations clearly demonstrate that the temperature of PV module can be markedly decreased about 4.6 C by incorporatingthe MEPCM layer of aspect ratio 0.277 with the melting point of 26 C during the winter operation considered.

Contents
Abstract....................	I
摘要.........................................	II
Acknowledgements...............................	III
Contents.....................................	IV
Table..............................................VII
Figures..............................................	VIII
Nomenclature.......................................	XI

Chapter One: Introduction
1   Background..............................	1
2   Literature Review........................	2
3   Method of Research.....................	4
4   Scheme of Work...........................	4

Chapter Two : Mathematical Formulation and Numerical Method
1	PV Cell ......................................	10
2	PV/MEPCM Model........................	11
3	Dimensional Mathematical Model.................	12
3.1	Photovoltaic Cell Energy Balance.................12
3.2	MEPCM Mathematical Equation.......................13
3.2.1	Momentum Equation...............13
3.2.2	Stream Function – Vorticity Equation.........15
3.2.3	Energy Balance.................16
3.2.4	Melting Fraction Equation..........16
3.3	Initial and Boundary Condition................17
3.3.1	PV Layer Initial and Boundary Condition.........17
3.3.2	MEPCM Layer Initial and Boundary Condition.......18
3.4	Formulation for PV/MEPCM Composite Layer under Temporal Variations of Solar Irradiation and Exterior Ambient Temperature……………………..18
4	Dimensionless Mathematical Model................ 19
4.1	Photovoltaic Cell Dimensionless Mathematical Model...19
4.2	MEPCM Dimensionless Mathematical Model...........20
4.2.1	Stream Function – Vorticity Equations............20
4.2.2	Energy Balance.............................20
4.2.3	Melting Fraction Equation....................20
4.3	Initial and Boundary Conditions…...........21
4.3.1	PV Layer Initial and Boundary Condition..........21
4.3.2	MEPCM Layer Initial and Boundary Condition......21
4.3.3	Dimensionless Variables and Parameters...........22
4.4	Formulation for PV/MEPCM Composite Layer under Temporal Variations of Solar Irradiation and Exterior Ambient Temperature……23
4.5	Input Data................................24
5	Numerical Method ..........................26
5.1	Grid System..................................26
5.2	Discretize Method...............................27
5.3	Numerical Simulation Calculation Process.........28
6	Quantities of Technical Interest................31
6.1	Surface-Averaged Temperature over The PV Cell.....31
6.2	Surface Averaged Electrical Efficiency of PV Cell...31
6.3	Total Electrical Energy Generated by the PV Cell over a Time Interval of Solar Irradiation.......31
6.4	Time-Averaged Electrical Efficiency of PV Cell over a Time Interval of Solar Irradiation.............32
6.5	Local Nusselt Numbers at The Outer and Inner Walls of The PCM Layer.............................32
6.6	Surface Averaged Nusselt Numbers at The Outer and Inner Walls of The PCM Layer...................33
6.7	Surface-Averaged Heat Transfer Rate into The PCM Layer...............33
6.8	Total Energy into The PCM Layer over a Time Interval.....................33
6.9	Surface Averaged Heat Transfer Rate into The Interior Ambient.............	34
6.10	Surface Averaged Heat Transfer Rate into The Outer Ambient……...	34
6.11	Total Energy Dissipated into The Interior Ambient over a Time Interval........................34
6.12	Fraction of Energy Stored in The PCM Layer over a Time Interval.....	35

Chapter Three: Results and Discussion
1 Different Condition Each Seasons.................36
2 Quantities of Interest.......................39
2.1 Summer Operation Condition................39
2.2 Winter Operation Condition.......................40
2.3 Normal Operation Condition...........41
2.3.1 Different Aspect Ratio................41
2.3.2 Different Melting Temperature............44

Chapter Four: Conclusions and Future Studies.........67
References  69
                                    

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