scholarly journals Numerical analysis of solar heat gain on slim-type double-skin window systems - Heat transfer phenomena with opening of windows and vent slot in summer condition -

KIEAE Journal ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 69-75
Author(s):  
Ji-Ho Park ◽  
Eun-Joo Oh ◽  
Dong-Woo Cho ◽  
Kyung-Joo Cho ◽  
Jung-Yeon Yu
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Heat Gain ◽  
Solar Heat ◽  
Summer Condition ◽  
Window Systems ◽  
Double Skin ◽  
Solar Heat Gain

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.

scholarly journals STUDY ON SOLAR HEAT GAIN AND THERMAL TRANSMITTANCE OF EAST- AND WEST-FACING DOUBLE-SKIN FA^|^Ccedil;ADE IN HOT AND HUMID CLIMATE

2012 ◽  
Vol 18 (40) ◽  
pp. 989-994
Author(s):  
Rosady MULYADI ◽  
Gyuyoung YOON ◽  
Masaya OKUMIYA
Keyword(s):  
Humid Climate ◽  
Heat Gain ◽  
Solar Heat ◽  
Thermal Transmittance ◽  
Double Skin ◽  
East And West ◽  
Hot And Humid Climate ◽  
Solar Heat Gain

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

scholarly journals Solar Heat Gain Coefficient Analysis of a Slim-Type Double Skin Window System: Using an Experimental and a Simulation Method

Energies ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 115 ◽  
Author(s):  
Kyung-joo Cho ◽  
Dong-woo Cho
Keyword(s):  
Simulation Method ◽  
Gain Coefficient ◽  
Heat Gain ◽  
Solar Heat ◽  
Window System ◽  
Double Skin ◽  
Solar Heat Gain

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.

Measuring Solar Heat Gain through Window Systems

1995 ◽  
Vol 38 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Deo K. Prasad
Keyword(s):  
Heat Gain ◽  
Solar Heat ◽  
Window Systems ◽  
Solar Heat Gain

scholarly journals VEGETATION INSULATION SCREEN AS A PASSIVE COOLING SYSTEM IN HOT HUMID CLIMATE: HEAT AND MASS EXCHANGES

2021 ◽  
Vol 9 (10) ◽  
pp. 1368-1378
Author(s):  
Hodo-Abalo Samah ◽  
◽  
Magolmeena Banna ◽  
Belkacem Zeghmati ◽  
◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Cooling System ◽  
Gain Factor ◽  
Passive Cooling ◽  
Humid Climate ◽  
Heat Gain ◽  
Area Index ◽  
Solar Heat ◽  
Solar Heat Gain

Planted roofs are passive cooling techniques that reduce the thermal load of buildings. In this paper, a Dynamic mathematical model based ontime average Navier-Stokes equationsfor a plantedroof in hothumidclimates has beendeveloped for evaluating the cooling potential.Transfer equations are solved using a finite difference scheme and Thomas algorithm. The model was applied for the simulation of a planted roof in Togolese climate conditions. Results showed that, evapotranspiration and Solar Heat gain Factor are functions of the Leaf Area Index LAI which is the most important parameter when considering the foliage material. For LAI equal to 6, latent heat peak value reaches 900 W.m-2while that of sensible heat is around 350 W.m-2. Solar heat gain factor can bereducedto 15% fortheplantedroofagainst 45% forbareroof. It is clearly proved that the foliage density and hence the vegetation canopy type selection greatly influence the thermal efficiency of the bioclimatic insulation screen. A larger Leaf Area Index reduces the solar flux penetration and increases evapotranspiration which is an important parameter when considering surrounding microclimate formation.

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.

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