planning:refurbishment_with_passive_house_components:mechanical_systems:influence_of_retrofitting_on_daylighting
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planning:refurbishment_with_passive_house_components:mechanical_systems:influence_of_retrofitting_on_daylighting [2014/05/23 16:55] – twessel | planning:refurbishment_with_passive_house_components:mechanical_systems:influence_of_retrofitting_on_daylighting [2014/09/18 18:19] (current) – external edit 127.0.0.1 | ||
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+ | ====== Influence of retrofitting on daylighting ====== | ||
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+ | ===== Introduction ===== | ||
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+ | Some building physics projects can have a direct impact on daylighting. Optimized lighting has very many positive features that should be considered when modernizing a building. For instance, light directly impacts building users’ mental capacity and visual perception [Ba 1999]. Light also regulates physical processes, such as the release of hormones, and provides the natural pacemaker for the human circadian rhythm [Rüger 2006]. Inadequate light intensity for a sustained period may also trigger symptoms of depression. In addition to psychological and physiological effects, optimized daylighting also has energy benefits. For example, reducing artificial light periods by improving daylight autonomy saves electricity. \\ | ||
+ | \\ | ||
+ | |{{: | ||
+ | |**//Figure 1: \\ Hours of available daylight// | ||
+ | \\ | ||
+ | Non-residential buildings can get a lot of their lighting from daylight. Figure 1 compares the hours during which an office is used (8 am to 6 pm) with daylight hours. When a building has good daylighting, | ||
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+ | * Additional reveal shading by external insulation \\ | ||
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+ | * Light transmission losses caused by retrofitting glazing (such as upgrading from double-pane to multi-pane glazing) \\ | ||
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+ | * Existing obstructions whose architecture cannot be influenced (atria, etc.) \\ | ||
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+ | An automated assessment loop was developed to examine these light issues, combining the Matlab math software with light simulation program Radiance. A parametrized model helps replicate widely varying geometry and material characteristics, | ||
+ | \\ | ||
+ | ===== Read more ===== | ||
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+ | //These in-depth articles are available exclusively to iPHA-members.// | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
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+ | [[planning: | ||
+ | \\ | ||
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+ | ===== Summary ===== | ||
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+ | Good daylighting can help to keep artificial lighting usage very low. But retrofits to upgrade heat insulation can make buildings less self-sufficient in terms of daylighting. Any such losses can be avoided or offset by taking the necessary measures. For instance, external insulation adds reveal shading and thus reduces daylighting. But this can be lowered by cutting back the window reveal or designing the reveal to have a high reflection factor. Choosing different glass and coatings can achieve a variety of glazing properties. For instance, multi-pane glazing can have high transmission if developers select non-reflecting glazing and Low-E coatings with high visual transmission. In the event of significant obstructions (such as atria), designing structures to have a high reflection factor can also enhance daylighting. \\ | ||
+ | \\ | ||
+ | //The K-Light project is supported by the Austrian Ministry of Transport, Innovation, and Technology (BMVIT), the Ministry of Economy, Family and Youth (BMWFJ) and the Austrian states of Vorarlberg, Tirol, and Burgenland as part of the Competence Center for Excellent Technology (COMET). The COMET program is administered by the Austrian Research Promotion Agency (FFG).// \\ | ||
+ | \\ | ||
+ | ===== References ===== | ||
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+ | **[Ba 1999]** Bartenbach, | ||
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+ | **[Boer 2006]** Boer JD, Aydinli S, Cornelius W, et al. Ein umfassendes Instrumentarium zur Ermittlung des Energiebedarfs für Beleuchtungszwecke. 2006:1-27. \\ | ||
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+ | **[Calumen]** Calumen II, Saint Gobain; http:// | ||
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+ | **[Rüger 2006]** Rüger M, Gordijn MCM, Beersma DGM, de Vries B, Daan S. Time-of-day-dependent effects of bright light exposure on human psychophysiology: | ||
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+ | **[We1 2012]** Werner, | ||
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+ | **[We2 2012]** Werner, | ||
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+ | **[Win 2010]** Lawrence Berkeley National Laboratory. THERM 6.3 / WINDOW 6.3 NFRC Simulation Manual. 2010; (October). http:// | ||
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+ | ====== See also ====== | ||
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+ | [[phi_publications: | ||
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+ | [[http:// | ||
planning/refurbishment_with_passive_house_components/mechanical_systems/influence_of_retrofitting_on_daylighting.txt · Last modified: 2014/09/18 18:19 by 127.0.0.1