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

Abstract

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.

Technical requirements for translucent structures of schools and kindergartens

“…Considering the significant differentiation of the school's and kindergarten's premises according to their functional purpose and mode of operation, it seems promising to develop adaptive window systems that allow them to change their constructive solution during the day and in the annual cycle taking into account changing external conditions and modes of operation of premises. Researches show [17][18][19][20][21] that when choosing windows it is necessary to additionally conduct also a multifactor analysis of their technical characteristics (light transmission, thermal protection, sound insulation, etc. ).…”

Experimental and Numerical Investigation on Design Optimization of a Roof Skylight Combined with Solar Chimney

“…Green facades to control wall surface temperature in buildings were investigated [11]. Day lighting and thermal analysis using various double reflective window glasses for green energy buildings was discussed [12]. Also, numerous investigations on the effect of the parameters of solar chimney have been carried out because they are critical for the fluid flow and heat transfer in solar chimney [cavity [13][14][15][16][17][18][19].…”