Abstract
The simulation analysis of the potential energy savings from the prismatic glass structure has been provided. The two conventional triple glazings and two proposed triple glazings with prismatic glass have been experimentally tested to obtain the realistic angular selective optical properties. The experimental results have been compared with conventional triple glazing with clear glass panes and triple glazing with solar control pane applied. The comparison indicated high potential advantages of triple glazing with prismatic glass structures (especially for reverse symmetrical prism): low transmittance for high solar altitude–summer condition, high transmittance for low solar altitude–winter condition. The obtained transmittance characteristics were used as input data for the annual simulation of a typical office in the Czech Republic. The simulation has been performed in TRNSYS and TRNBuild software. The gathered results confirmed, that prismatic glass structure can bring energy savings for both cooling and heating energy demands.
Highlights
Nowadays buildings operation accounts for more than 40 % of the total energy use in Europe
The alternatives A3 and A4 are based on the frontal asymmetrical prism (C) and the reverse symmetrical rectangular prism (D), which were used for the upper part, and the conventional clear glazing A, which is used for the middle part
The cooling energy demand of alternatives with solar protection triple glazing applied in the middle part and prismatic structures applied in the upper part (A5 and A6) is higher compared to the A2 alternative where solar protection triple glazing (B) was used both for the upper and the middle part
Summary
Nowadays buildings operation accounts for more than 40 % of the total energy use in Europe. The majority of solar control systems must respect window orientation, room configuration, and latitude [4,5,6] Static devices such as overhangs and louvres affect the architectural and structural design of a building and must be considered at the start of the design phase as they require a defined geometry significantly associated with the building architectural design. Shehabi et al researched a potential of the dynamic prismatic window coating that can continuously control incoming light to maximize the performance and energy savings. Another approach how to control solar heat gains is use of static angular selective films and coatings, which transmit the daylight within a specific range of incident solar altitude angles. The simulation results have been compared with conventional clear triple glazing and solar control triple glazing which are still the only wide spread competitive solution in the building practice today
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