Design of windows to reduce solar radiation transmittance into buildings

Taleb, A.M.; Al-Wattar, Abbas J. H.

doi:10.1016/0741-983x(88)90041-0

Cited by 18 publications

(6 citation statements)

References 2 publications

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“…Numerous studies and simulations have been performed to minimize solar radiation by building materials. Taleb and Al-Watter built windows to limit incoming solar radiation in building enclosures and published analytical models to quantify solar radiation [21]. Specific statistical measurements have been documented to determine glazing properties such as solar coefficient of heat gain, overall heat transfer coefficient, and solar optical properties for various window structures under various climatic conditions [22].…”

Section: Introductionmentioning

confidence: 99%

Energy Savings and Carbon Emission Mitigation Prospective of Building’s Glazing Variety, Window-to-Wall Ratio and Wall Thickness

et al. 2021

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Strategic selection of glazing, its window-to-wall ratio, and wall thickness of building reduce the energy consumption in the built environment. This paper presents the experimental results of solar optical properties of five glasses: clear, tinted bronze, tinted green, bronze reflective, and polymer dispersed liquid crystal glasses. Laterite room models were modeled with four different thicknesses and four different glasses using Design Builder, and thermal simulation tests were carried out using Energy Plus. The energy savings and carbon emission mitigation prospective of a building’s glazing variety, window-to-wall ratio (WWR), and wall thickness were investigated. The results revealed that among the five window glasses studied, the polymer dispersed liquid crystal glazing window (PDLCGW) was found to be the most energy-efficient for low heat gain in laterite rooms. The laterite room with 0.23 m wall thickness and 40% PDLCGW WWR reduced 18.9% heat gain in comparison with the laterite room with 0.23 m wall thickness and 40% clear glass WWR. The laterite room of 0.23 m wall thickness with PDLCGW glazing of 40% WWR enhanced cooling cost savings up to USD 31.9 compared to the laterite room of 0.08 m wall thickness with 40% PDLCGW. The laterite room of 0.23 m wall thickness with PDLCGW glazing of 40% WWR also showed improved carbon mitigation of 516 kg of CO2/year compared to the 0.23 m wall thickness laterite room of 40% WWR with clear glass glazing. The results also showed that the laterite room with 0.23 m wall thickness and 100% clear glass WWR increased heat gain by 28.2% in comparison with the laterite room with 0.23 m wall thickness and 20% clear glass WWR. The results of this article are essential for the strategic design of buildings for energy saving and emission reduction.

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Section: Introductionmentioning

confidence: 99%

Energy Savings and Carbon Emission Mitigation Prospective of Building’s Glazing Variety, Window-to-Wall Ratio and Wall Thickness

et al. 2021

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“…Heat gains from the transparent surfaces of a building have an important part in building's cooling load, especially in buildings with greater transparent areas [23]. One part of the solar radiation is being transmitted to inner space, a smaller portion of solar radiation gets absorbed in the fenestration, and part of this is transferred to the room as infrared radiation and the other part by convection [24].…”

Section: Fourth Design Variable: Solar Heat Gain Coefficientmentioning

confidence: 99%

“…Latitude, tilt, and azimuth will be constants, if we don't change the location, slope, or orientation of the window, which leaves only declination and solar hour as unknowns. Declination ( ) is the angular location of the sun north of south of the celestial equator, which can vary 23 Therefore, the cosines of both angles need to be found. As incident and zenith angles are a complex system on many other solar angles, angles of declination, latitude, tilt (or slope of the surface), azimuth, and solar hour need to be calculated.…”

Section: The Indirect Calculation Of the Third Design Variable: Orientationmentioning

confidence: 99%

Development of a Reduced Order Model of Solar Heat Gains Prediction

et al. 2020

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The aim of this study was to elaborate and validate a reduced order model able to forecast solar heat gains as a function of the architectural parameters that determine the solar heat gains. The study focused on office buildings in Catalonia and Spain and their physical values were taken from the Spanish Building Technical Code and European Union Directive 2018/844. A reduced order model with three direct variables (solar heat gain coefficient, shade factor, window to wall ratio) and one indirect design variable (building orientation) was obtained and validated in respect to the International Performance Measurement and Verification Protocol. Building envelope properties were fixed and the values were taken from the national standards of Spain. This work validates solar heat gain coefficient as a primary variable in determining the annual solar heat gains in a building. Further work of developed model could result in building energy need quick evaluation tool in terms of solar heat gains for architects in building early stage as it has an advantage over detailed building simulation programs in terms of instant calculation and the limited need for predefined input data.

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“…Study of various glass windows like clear, bronze, green and bronze-reflective glass windows to keep the window inclined towards the earth to minimize the direct solar radiation from all locations to Indian latitudes was reported [2]. Minimization of solar radiation through clear and bronze window glass materials to keep inward inclination 150 to window to Bagdad city latitude was studied in detail [3]. Analysis of decrease in energy consumption by various exterior envelopes like double clear, double low-E glasses to office buildings in hot climatic zone Saudi Arabia was done by using design builder simulation tool [4].…”

Section: Introductionmentioning

confidence: 99%

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

Gorantla¹,

Shaik²,

Setty³

2018

IJHT

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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.

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Design of windows to reduce solar radiation transmittance into buildings

Cited by 18 publications

References 2 publications

Energy Savings and Carbon Emission Mitigation Prospective of Building’s Glazing Variety, Window-to-Wall Ratio and Wall Thickness

Energy Savings and Carbon Emission Mitigation Prospective of Building’s Glazing Variety, Window-to-Wall Ratio and Wall Thickness

Development of a Reduced Order Model of Solar Heat Gains Prediction

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

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