Fragmented Light Shelf: Sun protection system and...
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PLEA2012 - 28th Conference, Opportunities, Limits & Needs Towards an environmentally responsible architecture Lima, Perú 7-9 November 2012 Fragmented Light Shelf: Sun protection system and daylighting optimization M. PÉREZ 1 , P. OTEIZA 2 , J. NEILA 1 1 Department of Construction, Superior Technical School of Architecture of Madrid, Spain 2 Department of Physics and Installations, Superior Technical School of Architecture of Madrid, Spain ABSTRACT: The Fragmented Light Shelf (FLS) is an element that improves the natural lighting, provides solar protection and can be easily incorporated into the window of a building under refurbishment, or a new construction. This element is made of two components the shelf and the louvers. These two components can vary, either by the construction material or the shape. To select the best combination of both components, several configurations have been designed and simulated with Ecotect software (v5, 5). However to confirm this, some solutions were monitored in two 1:10 scale models (one is used as a reference and other as FLS). The sensors in each model were placed, one near the window and other far from the window. The measurements were obtained with clear skies, and 68,000 lux of global illuminance outside. The FLS model obtains 1,600 lux on the sensor furthest from the window, while the sensor nearest to the window obtains 700 lux. The reference model obtains 55,000 lux on the sensor away from the window (was receiving direct radiation), and 1,400 lux on the sensor nearest to the window. It shows that the FLS system improves the daylighting and avoids glare in the indoor spaces. Keywords: daylighting, sun protection, sustainability, industrialization, refurbishment. INTRODUCTION In the research group ABIO, Bioclimatic architecture in a sustainable environment (Department of Construction and Technology in Architecture, DCTA). In the line of research “Optimization of natural lighting”, strategies have been developed to improve the lighting and heating conditions of the room. A Modular Window that capture heat and distributes natural light optimally, is one of the results and has served as a basis to develop other systems, including those presented in this paper. Awnings, sunshades and blinds are some of the frequently used shading elements. However, these elements of efficient solar control often only work to reduce direct solar impact and avoid heat gain in glazed areas, preventing natural diffused sunlight reaching the workspace and thus forgetting that natural light helps create a visually stimulating and productive environment. To comply with the directive 2002/91/EC, Spain has created three new legal documents: the Technical Building Code, the new RITE (revised 1998) and the Energy Certification of Buildings. As a result of this new legislation was implemented the Action Plan Strategy and Efficiency Savings 2005-2012, the Ministry of Industry, Tourism and Commerce. In the second edition of this Action Plan 2008-2012 (PAE4 +) include strategic measures for the construction sector, as: the first action which provides for rehabilitation of the thermal envelope of existing buildings, by implementing energy efficiency criteria in the refurbishment of its thermal envelope. It is necessary to develop sun protection systems that will not decrease the natural light needed in an environment and that can also be easily incorporated into a building. In this respect, a system is being developed which responds to the careful balance between heat gain and loss; glare control and seasonal variations in natural light; the need for sun protection and adequate natural lighting. It also has the potential to significantly lower the cost of energy consumption, increase user productivity, reduce emissions and lower operating costs. WORKING METHODOLOGY The methodology is based on establishing design parameters that meet the climatic conditions of Madrid, defining the necessary components to accomplish design objectives and finally evaluating their behaviour. To evaluate the performance of the options developed, the following will be carried out: - Daylighting simulations, simulations using Ecotect software on each option in order to achieve the best performing configurations. These will be evaluated under two points of view: the luminous efficiency over a working surface and the shadow obtained on the glass area.
Fragmented Light Shelf: Sun protection system and ...plea-arch.org/ARCHIVE/2012/files/T08-20120130-0057.pdf · Fragmented Light Shelf: Sun protection system and ... is an element
