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Research Papers

Comparative Performance of a Solar Screen With Respect to Perforation Ratio: Illuminance and Energy Saving

[+] Author and Article Information
Esam M. Alawadhi

Department of Mechanical Engineering,
Kuwait University,
P. O. Box # 5969
Safat 13060, Kuwait

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received February 15, 2018; final manuscript received July 19, 2018; published online September 14, 2018. Assoc. Editor: Jorge Gonzalez.

J. Sol. Energy Eng 141(1), 011012 (Sep 14, 2018) (8 pages) Paper No: SOL-18-1075; doi: 10.1115/1.4041103 History: Received February 15, 2018; Revised July 19, 2018

The objectives of sustainable building design are to provide the comfort to the occupants and to eliminate negative environmental impacts of its operations. In this regard, windows play a crucial role in saving energy used for electrical lights and enhancing the indoor visual environment. Excessive sunlight penetration through the windows could increase the heat gains and create the uncomfortable visual environment. Hence, external shading devices, such as solar screens, control the sunlight penetration and minimize its negative effects. The objectives of this research are to provide new insight into the impact of installing the solar screen on the indoor visual environment and heat gain through the window. Experimental measurements are conducted in extreme weather month and window direction, in June and for West facing façade window. Three design patterns of the solar screen were considered with perforation ratios of 12.5%, 25%, and 35%. Without a solar screen, the results show that there is a significant illuminance level variation in the indoor space, between 200 and 2250 Lux. However, if a solar screen with 12.5% perforation ratio is installed, the illuminance level in entire indoor space becomes uniform, it is maintained at 400 Lux during the daytime, and thereby visual comfort is attained. Additionally, the heat gain through the window is decreased by 52.8%, and the window is prevented from heating up during the daytime.

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Figures

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Fig. 1

A building in Kuwait city with screen installed on the windows

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Fig. 2

Window (a) without solar screen, and with solar screen with (b) 35%, (c) 25%, and (d) 12.5% perforation ratios

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Fig. 3

Measured outdoor air temperature and solar radiation, for the mid-June and west-facing direction

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Fig. 4

Indoor space, for the window (a) without a solar screen, and with a solar screen with perforation ratio of (b) 35%, (c) 25%, and (d) 12.5%

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Fig. 5

The illuminance contour plot in the indoor space at 3:00 PM, for the window (a) without a solar screen, and with a solar screen with perforation ratio of (b) 35%, (c) 25%, and (d) 12.5%

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Fig. 6

The indoor illuminance level in the indoor space for a widow without a solar screen, and with solar screen installed with difference perforation ratios

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Fig. 7

Temperature distribution at the indoor surface of the window at 3:00 PM, for the window (a) without a solar screen, and with a solar screen with perforation ratio of (b) 35%, (c) 25%, and (d) 12.5%

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Fig. 8

Heat flux at the indoor surface of the window with a solar screen with difference perforation ratios, and window without a solar screen

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