scholarly journals Hybrid system strategy on double skin façade to optimize thermal performance on research building

2021 ◽  
Vol 881 (1) ◽  
pp. 012048
Author(s):  
Abdul Hakim Abdul Majid ◽  
Azhar Ghazali
Keyword(s):  
Solar Radiation ◽  
Latent Heat ◽  
Thermal Performance ◽  
Spatial Diversity ◽  
Curtain Wall ◽  
Heat Gain ◽  
Solar Heat ◽  
Double Skin ◽  
Solar Heat Gain ◽  
Indoor Spaces

Abstract One of the most efficient methods to optimize thermal performance in a building is the practical design of the façade. The double skin façade‘(DSF) is a crucial decision for handling the interaction between outdoor and indoor spaces. It also offers some spatial diversity in the design process. Recently, a lot of focus has been paid to it instead of the more traditionally glazed curtain wall. This is because of its potential to reduce energy effectively, achieve thermal comfort in the building, and save costs. The indoor spaces near to the glazed facades will become warm due to high incidence solar radiation on the East-West facades in Malaysia’s tropical environment. In the tropics, one of the solar heat gain reduction approaches is the use of double skin-facade (DSF). One of the fundamental components of the double-skin facade is the blinds. Blinds located in the cavity of the double-skinned facade and buffer the building from solar heat gain or perform the role of a pre-heater for ventilation air. In general, the temperature of the blinds is high, which is helpful in the cold period but problematic in the hot period. To minimize the cooling loads of the building, technological innovations for the shading system are considered. Plants can dissipate absorbed solar radiation into resistant and latent heat. Plants turn radiation into the latent heat. This paper aims to study the effectiveness of a double skin façade and explore improved innovative design for a double-skin façade design integrated with vertical green on research building to optimize thermal performance. This paper will collect data of the thermal performance of double skin façade, precedent study and run simulation analysis to achieve the aim of the paper.

Total Solar Energy Transmittance vs. Dynamic Thermal Characteristics of Non-Transparent Building Components

2014 ◽  
Vol 899 ◽  
pp. 77-82
Author(s):  
Roman Rabenseifer
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Thermal Performance ◽  
Thermal Characteristics ◽  
Heat Gain ◽  
Solar Heat ◽  
Interior Spaces ◽  
Building Components ◽  
Solar Heat Gain ◽  
The Difference

Occasionally, there are suggestions from professional public to use the total solar energy transmittance coefficient, g (solar factor), to describe not only transparent, but also opaque structures, particularly with regard to overheating of the under-roof spaces. The standard EN 410:1998 (Glass in building - Determination of luminous and solar characteristics of glazing) introduces the g-value as the sum of primary solar heat gain, g1, due to the transparency of the glazing and the secondary solar heat gain, g2, due to the absorption of solar radiation and its conversion into heat conduction and radiation over the total incident solar heat flux, φe. Nevertheless the value of g1 may have zero or nearly zero value, e.g. in case of non-transparent glass. In addition to it, the standard ISO 15099:2003 (Thermal performance of windows, doors and shading devices - Detailed calculations) introduces equation for calculation of the frame g-value (actually the frame total solar energy transmittance), where window frames are clearly opaque components. What is then the difference between glass and "standard" opaque wall or roof? Why is in the latter case always introduced zero and in the first one some value different from zero? Won't it be practical, especially in time of large existing opportunities of computer use, to implement the use of g-values also in case of ordinary opaque structures and express their resistance to the absorption and conversion of solar radiation and thus overheating the adjacent interior spaces? This paper attempts, using EN ISO 13786 (Thermal performance of building components - Dynamic thermal characteristics - Calculation methods) and computer-aided models of transient heat transfer, to explain why the suggestion of using of the g-value in case of opaque components is not entirely correct and, why priority should be given to the dynamic thermal characteristics specified in this standard.

Reducing Roof Solar Heat Gain by Using Double-Skin Ventilated Roofs

2020 ◽  
Vol 38 (3A) ◽  
pp. 402-411
Author(s):  
Mohannad R. Ghanim ◽  
Sabah T. Ahmed
Keyword(s):  
Inclination Angle ◽  
Convection Heat Transfer ◽  
Ventilation Rate ◽  
Channel Length ◽  
Air Gap ◽  
Galvanized Steel ◽  
Heat Gain ◽  
Solar Heat ◽  
Double Skin ◽  
Solar Heat Gain

Double skin ventilated roof is one of the important passive cooling techniques to reduce solar heat gain through roofs. In this research, an experimental study was performed to investigate the thermal behaviour of a double skin roof model. The model was made of two parallel galvanized steel plates. Galvanized steel has been used in the roof construction of industrial buildings and storehouses in Iraq. The effect of inclination angle (ϴ) from the horizontal and the spacing (S) between the plates was investigated at different radiation intensities. It is found that using a double skin roof arrangement with a sufficient air gap (S) can reduce the heat gain significantly. The higher the inclination angle (ϴ) the higher the ventilation rate, the lower the heat gain through the roof. In this study, increasing the air gap from 2 cm to 4 cm reduced the heat gain significantly but when the gap was further increased to 6 cm, the reduction in the heat flux was insignificant. A dimensionless correlation was also reduced between Nusselt number () and the single parameter  where L is the channel length. This correlation can be handily utilized for designing of engineering applications dealing with high temperature difference natural convection heat transfer.

Effects of solar radiation and wind speed on metabolic heat production by two mammals with contrasting coat colours.

1995 ◽  
Vol 198 (7) ◽  
pp. 1499-1507 ◽  
Author(s):  
G E Walsberg ◽  
B O Wolf
Keyword(s):  
Wind Speed ◽  
Solar Radiation ◽  
Heat Production ◽  
Metabolic Heat Production ◽  
Heat Gain ◽  
Solar Heat ◽  
Wind Speeds ◽  
Convective Heat Loss ◽  
Metabolic Heat ◽  
Solar Heat Gain

We report the first empirical data describing the interactive effects of simultaneous changes in irradiance and convection on energy expenditure by live mammals. Whole-animal rates of solar heat gain and convective heat loss were measured for representatives of two ground squirrel species, Spermophilus lateralis and Spermophilus saturatus, that contrast in coloration. Radiative heat gain was quantified as the decrease in metabolic heat production caused by the animal's exposure to simulated solar radiation. Changes in convective heat loss were quantified as the variation in metabolic heat production caused by changes in wind speed. For both species, exposure to 780 W m-2 of simulated solar radiation significantly reduced metabolic heat production at all wind speeds measured. Reductions were greatest at lower wind speeds, reaching 42% in S. lateralis and 29% in S. saturatus. Solar heat gain, expressed per unit body surface area, did not differ significantly between the two species. This heat gain equalled 14-21% of the radiant energy intercepted by S. lateralis and 18-22% of that intercepted by S. saturatus. Body resistance, an index of animal insulation, declined by only 10% in S. saturatus and 13% in S. lateralis as wind speed increased from 0.5 to 4.0 ms-1. These data demonstrate that solar heat gain can be essentially constant, despite marked differences in animal coloration, and that variable exposure to wind and sunlight can have important consequences for both thermoregulatory stress experienced by animals and their patterns of energy allocation.

The contribution of solar radiation to the thermal environment of man in Antarctica

1961 ◽  
Vol 155 (959) ◽  
pp. 243-265 ◽  
Keyword(s):  
Solar Radiation ◽  
Heat Loss ◽  
Thermal Environment ◽  
Ambient Air ◽  
Whole Body ◽  
Cooling Power ◽  
Effective Surface ◽  
Heat Gain ◽  
Solar Heat ◽  
Solar Heat Gain

The parameters of solar radiation affecting man in Antarctica are considered, using data from two coastal stations and from the South Pole. Observations of solar radiation and its effects on clothing and skin temperatures of men standing on snow at Scott Base are reported. From measurements of the spectral reflectance of the outer garments and the regional thermal insulation of the clothing made subsequently, the solar heat gain at the clothing surface and its effect on heat transmission through the clothing and on heat loss to the environment were calculated. The effective surface area of the clothed body surface exposed to direct and reflected solar radiation, and the effective surface areas concerned in low temperature radiation exchange and convective heat loss, are considered. An attempt was made to determine these areas by direct measurement. The results were used to calculate values for the solar heat gain by the whole body and the cooling power of the environment under Antarctic conditions, the combined effects of which are expressed in terms of a temperature increment to be added to the ambient air temperature.

Prediction of solar heat gain of double skin facade windows

2016 ◽  
Vol 9 (4) ◽  
pp. 399-409 ◽  
Author(s):  
Guoqing He ◽  
Jianfeng Xu ◽  
Yun Zheng ◽  
Sanming Zhang ◽  
Qi’an Bai
Keyword(s):  
Heat Gain ◽  
Solar Heat ◽  
Double Skin ◽  
Solar Heat Gain

scholarly journals Solar Heat Gain Reduction of Ventilated Double Skin Windows without a Shading Device

2017 ◽  
Vol 10 (2) ◽  
pp. 64 ◽  
Author(s):  
Bokyoung Koo ◽  
Keonho Lee ◽  
Youngsub An ◽  
Kyudong Lee
Keyword(s):  
Heat Gain ◽  
Solar Heat ◽  
Double Skin ◽  
Gain Reduction ◽  
Solar Heat Gain ◽  
Shading Device
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