Day lighting and thermal analysis using various double reflective window glasses for green energy buildings

Day lighting and thermal analysis using various double reflective window glasses for green energy buildings

Kiran K. Gorantla Saboor Shaik Ashok B.T.P.R. Setty 

Mechanical Engineering Department, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, Karnataka, India

Department of Thermal and Energy, VIT University, Vellore 632014, Tamilnadu, India

Corresponding Author Email:
6 March 2018
13 August 2018
30 September 2018
| Citation



The objective of this research work is to identify the best double reflective window glass which provides adequate daylighting by controlling solar heat gain as per the requirement of summer and winter seasons of composite climatic zone in India. To attain this objective an investigation of spectral characteristics of different reflective glasses such like gold, sapphire blue, opal blue, grey, green and bronze reflective glasses is carried out experimentally using Shimadzu UV 3600 spectrophotometer in the entire solar spectrum wavelength range from 300 nm to 2500 nm based on ASTM E 424 standards.The measured spectral characteristics were used to compute the visible optical properties in the visible zone and solar optical properties in solar spectrum zone by using International standard method with a MATLAB code. The computed optical properties transmittance, reflectance and absorbance are used in the simulation tool for heat gain and daylight calculations for a school room building. As far as both hottest and coolest days are concerned double gold reflective window glass (DGLDRGW) is found to be the best in the South orientation. During hottest day, DGLDRGW gains minimum heat of 2.13 kWh with adequate daylight factor (2.049% at 9 A.M. and 2.025% at 4 P.M.) and also it gains maximum heat of 8.55 kWh with adequate daylight factor (2.729% at 9 A.M. and 2.732% at 4 P.M.) for school room building among six studied double reflective window glasses.


spectral characteristics, visible optical properties, solar optical properties and double gold reflective glass window

1. Introduction
2. Materials and Methods
3. Design and Thermal Analysis Procedure
4. Results and Discussion
5. Conclusions

[1] Singh I, Bansal NK. (2011). Thermal and optical properties of different window systems in India. International journal of Ambient Energy 23(4): 201–211. 

[2] Kirankumar G, Ashok babu TP. (2015). Study of optimum inward glass tilt angle for window glass in different Indian latitudes to gain minimum heat into buildings. Energy Procedia 79: 1039-1045.  

[3] Taleb AM, Al-Wattar AJH. (1988). Design of windows to reduce solar radiation transmittance into buildings. Solar & Wind Technology 5: 503-515. 

[4] Mohammed AF, Ismail MB. (2015). Energy performance of windows in office buildings considering daylight integration and visual comfort in hot climates. Energy & Buildings 108: 307-316. 

[5] Kirankumar G, Saboor S, Ashok Babu TP. (2016). Simulation of various wall and window glass material buildings for energy efficient building design. Key Engineering Materials 692: 9-16. 

[6] Seunghwan Y, Hakgeun J, Byung LA, Hyesim H, Donghyun S, Junghoon L, Cheol YJ. (2013). Thermal transmittance of window systems and effects on building heating energy use and energy efficiency ratings in South Korea. Energy & Buildings 67: 236-244. 

[7] Xing S, Zhang X. (2010). Environmental performance optimization of window–wall ratio for different window type in hot summer and cold winter zone in China based on life cycle assessment. Energy & Buildings 42: 198-202. 10.1016/j.enbuild.2009.08.015 

[8] Ingy El-D, Mohamed G.  (2017). Retrofitting strategy for building envelopes to achieve energy efficiency. Alexandria Engineering Journal 56: 579-589. 

[9] Halil A. (2016). Dedayination of optimum window to external wall ratio for offices in a hot and humid climate. Sustainability 187(8): 1-21. 

[10] Soojung K, Puyan AZ, Sheryl SF, Thomas F, Belgin TC. (2016). Assessment of the impact of window size, position and location on building energy load using BIM. Procedia Engineering 145: 1424-1431. 

[11] Kirankumar G, Ashok Babu TP. (2017). Study of various glass materials to provide adequate day lighting in office buildings of warm and humid climatic zone in India. Energy Procedia 109: 181-189.

[12] Madhu S, Tiwari GN. (2017). Day lighting and energy performance of a building for composite climate, An experimental study. Alexandria Engineering Journal 55: 3091-3100.

[13] Qiaoxia Y, Meng L, Chang S, Daniel M, Uzzal HMd, Xiang Z. (2015). Impact analysis of window-wall ratio on heating and cooling energy consumption of residential buildings in hot summer and cold winter zone in China. Journal of Engineering, Hindawi 1-17. 

[14] Madhu S, Tiwari GN, Al-Helal IM. (2015) A daylight factor model under clear sky conditions for building: An experimental validation. Solar Energy 115: 379-389. 

[15] Athienitis AK, Tzempelikos A. (2002). A methodology for simulation of daylight room illuminance distribution and light dimming for a room with a controlled shading device. Solar Energy 72(4): 271-282. 

[16] Kirankumar G, Saboor S, Ashok Babu TP. (2018). Effect of various external shading devices on windows for minimum heat gain and adequate day lighting into buildings of hot and dry climatic zone in India. Matec Web of Conference 144: 1-12. 

[17] Ahmed Abdel MMA. (2013). Using simulation for studying the influence of horizontal shading device protrusion on the thermal performance of spaces in residential buildings. Alexandria Engineering Journal 52: 787-796.  

[18] Madhu S, Richard GM, Tiwari GN. (2017). Climate-Based Daylight Modeling (CBDM) for an atrium: An experimentally validated novel daylight performance. Solar Energy 158: 559-571. 

[19] Arvind C. (2014). Performance of skylight illuminance inside a dome shaped adobe house under composite climate at New Delhi (India) A typical zero energy passive house. Alexandria Engineering Journal 53: 1-17. 

[20] Danny HWLi, Gary HW, Cheung Chris CSL. (2006). A simplified procedure for determining indoor daylight illuminance using daylight coefficient concept. Building and Environment 41: 578-589. 

[21] Danny HWLi, Gary HW, Cheung KL, Cheung T, Lam NT. (2010). Determination of vertical daylight illuminance under non-overcast sky conditions. Building and Environment 45: 498-508. 

[22] Yeo BY, Woo RJ, Kwang HL. (2014). Window material day lighting performance assessment algorithm comparing radiosity and split-flux methods. Energies 7: 2362-2376.  

[23] Kirankumar G, Saboor S, Vanish K, Kim KH. Ashok Babu TP. (2018). Experimental and theoretical studies of various solar control window glasses for the reduction of cooling and heating loads in buildings across different climatic regions. Energy & Buildings 176: 326-336. https://doi:10.1016/j.enbuild.2018.05.054 

[24] Kirankumar G, Saboor S, Ashok Babu TP. (2018). Thermal and cost analysis of float and various tinted double window glass configurations on heat gain into buildings of hot & dry climatic zone in India. Energy International Journal of Heat and Technology 36(1): 252-260. 

[25] ASTM E424 (1971). Test for Solar energy Transmittance and Reflectance (terrestrial) of sheet materials. Washington DC, USA, 1320-1326.

[26] BS EN: 410 (1998). Glass in Building-Dedayination of luminous and solar characteristics of the glazing. British Standards, 1-24.

[27] ISO 9050:2003(E). (2003). Glass in building Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors. 

[28] SP: 41 (1987). (S&T) Handbook on functional Requirement of Buildings other than industrial buildings. Bureau of Indian Standards, India, 33-40.

[29] ECBC (2009). Energy conservation building code. Bureau of Energy Efficiency, New Delhi. 

[30] GRIHA (2011). Green rating for integrated habitat assessment. Ministry of New and Renewable Energy, New Delhi, India. 

[31] NBC (2005). National Building Code of India 2005, Section 1 Building and Services Lighting and Ventilation. Part 8, Bureau of Indian Standards, New Delhi, India.

[32] Mani A. (1982). Solar radiation over India. Allied Publishers Private limited, India.

[33] Huang XQ, Zhang DL, Zhang X. (2017). Experimental research on heat/mass transfer features of corrugated plate spray humidification air coolers. Chemical Engineering Transactions 62: 379-384.

[34] Wang Q, Ren T, Sun Y, Xue Y, Fei W, Wang X. (2017). Thermal dynamic model and analysis of residential buildings. Chemical Engineering Transactions 61: 1057-1062.