A Study on the Use of Multiple Slat Fixed Overhangs for Shading and Daylighting on North and South Facing Facades

Name: Ditsaphon Matuampunwong

keyword: Glazing performance

Abstract: This thesis reports results of a series of experiments and analyses on daylighting through windows on southern facade shaded by a multiple slat shading system. Each of the horizontal flat slats had a width of 0.2 m and were spaced 0.3 m apart. The multiple slat shading system was designed to shade out direct radiation from the sun completely while still allowing daylight from the sky to enter and allowing a view from the interior to the exterior. It was deemed that the spacing between slats and the width of the slats chosen would not pose unacceptable annoyance when a person viewed through them. Such shading configuration could be employed with appropriate adjustment on slat width and spacing for the northern and southern facades to all tropical locations. The experiments were conducted in an experimental room in the Bangkhuntien campus of King Mongkut's University of Technology Thonburi where a daylight and solar radiation measurement station was also located. Laminated green and clear glass of high transmittance was used on the window that filled the width of the facade of the room. It was found that daylight transmitted through the slatted window provided illuminance of close to 100 lux at work plane level to a depth of 8.5 m from window. For an area close to the window, the slats on the upper part of the window shaded out daylight from the part of the sky nearer to the zenith. Locations further away from the window receive daylight transmitted through larger portion of the sky. Thus the slats tended to even out the direct sky component along the distance away from the window. This acted to moderate the typical exponential fall of the level of daylight illuimnace in the deeper part of the room. Also, the upper surfaces of the slats provided some reflection that enhanced further gain of daylight into the room. The slat shading system enhanced overall quality of light in the room. The walls were well illuminated and the potential of glare occurrence was also reduced. Heat fluxes and temperatures of wall surfaces as well of temperature of air in the were also measured in the experiments. A simulation program was used to calculate daylight illuminance, heat fluxes and temperatures at the measured points. The calculated results agree well with those from measurement. The computer program was then used to simulate application of such devices on windows of tall buildings under different types of glazing, different ratios of window area to wall area, and with and without insulation on walls. With proper arrangement, glazing that allows more daylight penetration is shown to offer energy and monetary savings over its cost, and the cost of air-conditioning energy. This research illustrates that it is possible to maximize benefits from utilizing appropriate window area to wall area, and from utilizing suitable glazing and wall insulation.

King Mongkut's University of Technology Thonburi. KMUTT Library.

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Surapong Chirarattananon

Role: Advisor

Created: 2009

Modified: 2023-06-20

Issued: 2011-01-24

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE226

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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