CONTENTS
1. Introduction 1
1.1. Background 1
1.2. Purpose Statement 4
1.3. Research questions 5
1.4. Research objectives 5
1.5. Need for the study 5
1.6. Limitations of the study 5
2. Literature Review 6
2.1. Windows in Buildings 6
2.2. Heat Gains through windows 6
2.3. Solar Heat Gain Coefficient 7
2.4. Reduction of heat gains through Windows 8
2.5. Heat gain through windows with shading devices 9
3. Methodology 11
3.1. Calculations for SHGC 11
3.1.1. Calculation of eSHGC 11
3.1.2. Calculation of wSHGCu and wSHGCs 13
3.2. Analysis for variation in SHGC 15
3.3. Energy Simulations 15
3.3.1. Base Case models for simulation 15
3.3.2. Input data 16
3.3.3. Simulations 16
3.4. Analysis of simulation results 16
4. Results and Analysis 17
4.1. Differences in the algorithms 17
4.1.1. eSHGC 17
4.1.2. wSHGCs 17
4.2. Differences in SHGC values 18
4.2.1. Difference due to location 18
4.2.2. Difference due to climate 19
4.2.3. Difference due to depth of overhangs 19
4.3. Impacts on solar gains due to different SHGC values 20
4.3.1. Annual Gains 20
4.3.2. Monthly Gains 22
4.4. Impact on cooling energy 24
4.5. Limit for wSHGC calculation 25
5. Conclusions 26
References 27
Appendix 28
Appendix A.1. Climate Zone Map of INDIA 28
Appendix A.2. Glazing Details (from WINDOW 6.0) 29
Appendix A.3. Models used for simulations 31
Appendix A.4. Declination of the Earth 37
Appendix A.5. Sun-path diagrams for the studied cities 38
Appendix A.6. Simulation Results 39