Towards an improved architectural quality of building integrated solar thermal systems (BIST)
ABSTRACT Architectural integration is a major issue in the development and spreading of solar thermal technologies. Yet the architectural quality of most existing building integrated solar thermal systems (BIST) is quite poor, which often discourages potential new users. In this paper, the results of a large web survey on architectural quality, addressed to more than 170 European architects and other building professionals are presented and commented. Integration criteria and design guidelines established and confirmed through the analysis of these results are proposed. Subsequently, a novel methodology to design future solar thermal collectors systems suited to building integration is described, showing a new range of design possibilities. The methodology focuses on the essential teamwork between architects and engineers to ensure both energy efficiency and architectural integrability, while playing with the formal characteristics of the collectors (size, shape, colour, etc.). Finally a practical example of such a design process conducted within the European project SOLABS is given; the resulting collector is described, and integration simulations are presented.
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ABSTRACT: The feasibility of encapsulating solar cells into the glass fiber-reinforced polymer (GFRP) skins of load-bearing and thermally insulating sandwich elements with foam cores has been evaluated. Exposure of the encapsulated cells to artificial sunlight led to a significant temperature increase on the top sandwich surface, which almost reached the glass transition temperature of the resin. Mechanical loading up to serviceability limit loads did not cause any damage to the solar cells. Stresses of less than 20% of the material strength arose in the face sheets due to thermal and mechanical loading up to failure. Composite action through the face sheets with encapsulated cells was maintained and no debonding between face sheets and foam core was observed. Thanks to the superior mechanical and thermal sandwich behavior, thin-film silicon cells are more appropriate than polycrystalline silicon cells for use in multifunctional GFRP sandwich structures, although they are less efficient. © 2010 ASCE.01/2010;
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ABSTRACT: Heating, ventilating, and air-conditioning (HVAC) are parts of the major energy consumption in a building. Conventional heating and cooling systems are having an impact on carbon dioxide emissions, as well as on security of energy supply. In this regard, one of the attempts taken by researchers is the development of solar heating and cooling technologies. The objective of this paper is to review the passive solar technologies for space heating and cooling. The reviews were discussed according to the working mechanisms, i.e. buoyancy and evaporative effects. The advantages, limitations and challenges of the technologies have been highlighted and the future research needs in these areas have also been suggested.Renewable and Sustainable Energy Reviews. 01/2010;
Conference Proceeding: Experimental Research on Heat Flux for Integration of Flat Solar Collectors and Roofs[show abstract] [hide abstract]
ABSTRACT: Three roof types including single roof without solar collector and two types of integration of flat solar collectors and roof are considered and researched by experimental testing during daytime and nighttime. Through analysis of data from experimental testing, the following conclusions are obtained: (1) During summer daytime, heat flow into the building through the integration of flat solar collector and roof is significantly reduced compared to the roof without collector. The heat gain of sealed type of integration is lower than the none-sealed type of integration. (2) During winter night, heat flow out of the building through the integration of flat solar collector and roof is significantly reduced compared to the roof without collector. The heat loss of sealed type of integration is lower than the none-sealed type of integration. (3) Integration of roof and flat solar collector can reduce the heat gain in summer daytime and heat loss in winter nighttime, the sealed type of integration is better than none-sealed type of integration whether in summer daytime or winter night.Power and Energy Engineering Conference (APPEEC), 2010 Asia-Pacific; 05/2010