Transport světla tubusovým světlovodem

doc. Ing. Daniela Bošová, Ph.D.

15124 Ústav stavitelství II

Design of the colour solution of the façade is usually focused only to achieve subjectively desirable aesthetic look of the building. In the whole context it however has many other connections including the environmental one. From this point of view it is very inappropriate to use dark colours with high absorption of solar and diffused radiation. This paper is focused on the influence of the colour of the façade surface on the external and internal surface temperature of the external walls, temperature of the air in their surroundings, and day lighting of the interior

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

This paper discusses tube transmission efficiency of two straight hollow light guides. Two samples with diameter of 530 mm and length 1170 mm were investigated under the artificial sky in the laboratory at ICA SAS in Bratislava. The entering luminous flux was calculated from measured illuminance in the point located on the top of light guide. Below the bottom of the light guide was located a set of measuring points on the special construction in the shape of a cross. In these points, one by one, the elementary illuminances were measured and the luminous fluxes leaving the light guide were calculated. Paper presents methodology for laboratory light transmission measurements and discusses effects of two various coating materials on light transmission efficiency of hollow light guides.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

This paper discusses tube transmission efficiency of two straight hollow light guides. Two samples with diameter of 530 mm and length 1170 mm were investigated under the artificial sky in the laboratory at ICA SAS in Bratislava. The entering luminous flux was calculated from measured illuminance in the point located on the top of light guide. Below the bottom of the light guide was located a set of measuring points on the special construction in the shape of a cross. In these points, one by one, the elementary illuminances were measured and the luminous fluxes leaving the light guide were calculated. Paper presents methodology for laboratory light transmission measurements and discusses effects of two various coating materials on light transmission efficiency of hollow light guides.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

CTU in Prague in cooperation with ICA SAS in Bratislava carried out laboratory measurements of the light transmission efficiency of direct hollow tubular light guide sample under the artificial sky. Tubular light guide of diameter 530 mm and length 1170mm was made from aluminium with polymer film on the inner surface. Two illuminance meters with spectral and directional corrected heads were used for measuring entering and tube exiting light. Sensor of illuminance meter measuring the quantity of exiting light was moved with constant step on the horizontal plane located just below edge of the tube. The second sensor measuring outdoor horizontal illuminance was set in stable position close the upper tube edge. The paper information about experimental measurements and discusses the obtaining results.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

This paper discusses tube transmission efficiency of two straight hollow light guides. Two samples with diameter of 530 mm and length 1170 mm were investigated under the artificial sky in the laboratory at ICA SAS in Bratislava. The entering luminous flux was calculated from measured illuminance in the point located on the top of light guide. Below the bottom of the light guide was located a set of measuring points on the special construction in the shape of a cross. In these points, one by one, the elementary illuminances were measured and the luminous fluxes leaving the light guide were calculated. Paper presents methodology for laboratory light transmission measurements and discusses effects of two various coating materials on light transmission efficiency of hollow light guides.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Daylight varies during daytime and it is an important health aspect of indoor visual environmental quality. Measurements of daylighting are very complicated in natural conditions, therefore processing and evaluation of measured date requires special care. The instantaneous illuminances in one room and outside in Bratislava with 5 - second time step were measured by two illuminance meters with data loggers. The first illuminance meter registered indoor illuminance and was placed on the level of the working plane inside the room in its centre. The second illuminance meter with an unscreened sensor was placed on the roof and measured exterior global horizontal illuminance. Daily illuminance courses derived from 5 sec instantaneous data and 1 min and 1 hour averages were inspected and evaluated. This paper presents results of evaluations of real measurements and the discussion focus on the influence of evaluation interval on the accuracy of daily illuminance courses

Detail

doc. Ing. Daniela Bošová, Ph.D.

15124 Ústav stavitelství II

Design of the color solution of the façade is usually focused only to achieve subjectively desirable aesthetic look of the building. In the whole context it however has many other connections including the environmental one. From this point of view it is very inappropriate to use dark colors with high absorption of solar and diffused radiation. This paper is focused on the influence of the color of the façade surface on the external and internal surface temperature of the external walls, temperature of the air in their surroundings, and day lighting of the interior.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Daylight varies during daytime and it is an important health aspect of indoor environmental quality. Measurements of daylighting are very complicated in natural conditions, therefore processing and evaluation of measured date requires special care. Daylighting in one room in Bratislava with 5 - second time step was measured by two illuminance meters with data loggers. The first illuminance meter registered ndoor illuminance and was placed on the level of the working plane inside the room. The second illuminance meter with an unscreened sensor was placed on the roof and measured exterior global horizontal illuminance. Daily illuminance courses based in the 5 sec, 1 min, 1 hour intervals were inspected and evaluated. This paper presents results of evaluations and the discussion concerning evaluation accuracy of daily illuminance courses based on real measurements in various recording intervals.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Denní světlo se mění v průběhu dne, a to je důležitý zdravotní aspekt kvality vnitřního prostředí. Měření denního osvětlení je velmi složité v přírodních podmínkách, a proto zpracování a vyhodnocení naměřených datu vyžaduje zvláštní pozornost. Denní osvětlení bylo měřeno v jedné místnosti v Bratislavě s 5 sekund ovým časovým krokem a to dvěma luxmetry s dataloggery .První luxmetr měřil vnitřní osvětlení a byl umístěn na úrovni úracovní roviny uvnitř místnosti. Druhý osvětlení metr s nechráněným senzorem byl umístěn na střeše a měřil vnější globální horizontální osvětlenost. Měření denní osvětlenosti založené na 5 sec, 1 min, 1 hodinových intervalech byly zkontrolovány a vyhodnoceny. Tento článek prezentuje výsledky hodnocení a diskusi týkající se přesnosti vyhodnocení denní osvětlenosti na základě reálných měření v různých záznamových intervalech.

Detail

doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Předpokladem hodnocení a využívání slunečního světla v budovách a simulování jeho celoročního průběhu je získání základních informací o změnách slunečního a oblohového světla a vlastnostech atmosféry. Světelný činitel zákalu je parametr, který charakterizuje zeslabení slunečního světla při přechodu atmosférou, umožňuje analyzovat sluneční situace a předurčuje úroveň vnější přímé osvětlenosti. V příspěvku jsou analyzovány a diskutovány výsledky měření denního osvětlení pořízené během jasných dní na CIE IDMP stanici v Bratislavě.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Nejslabším článkem panelových objektů jsou především jejich obvodové pláště, proto většina regenerací souvisí právě s rekonstrukcí stávajících obvodových plášťů. Jedná se zejména o výměnu okenních otvorů, dodatečné zateplení či úpravy předsazených konstrukcí vč. zasklení lodžií a v neposlední řadě i změnu barevnosti povrchové vrstvy fasády. Těmito úpravami určitě dokážeme zlepšit energetickou náročnost objektu, ale je nutné přihlédnout na sekundární negativní ovlivnění vnitřního prostředí z hlediska úrovně denního osvětlení. V této studii jsme se pokusili zohlednit jak šířku, tak tvar ostění okenního otvoru s přihlédnutím na vliv denního osvětlení uvnitř místnosti.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Daylighting has always been natural thing for people inside buildings. It serves to create appropriate visual conditions without the financial and energy requirements, but also affects physiology and psychology of human needs and health. Meaningful use of daylighting keeps sustainable development. Currently, there is great emphasis on sufficient insulation of envelopes of buildings with reducing the glass surfaces. Despite the great development in the area of windows, windows are still weakening of the overall building façade. Often designed new windows have minimum dimensions, massive window frames and now triple glazing. These measures may minimize heat losses of the building, but also reduce the amount of daylight in interiors. Such approach has resulted in the lack of light inside the room, which has an adverse impact on human health. This paper shows how some reconstructions can affect daylight inside buildings – e.g. wall thickness, glazing, window frames. Most of reconstructions of building envelopes bring benefits from thermal viewpoint but reduction quality of indoor luminous environment. By contrast, some such reconstructions have beneficial effects both on thermal and optical properties of opaque and transparent elements.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Svetlovod je jedným z osvetľujúcich prvkov, ktoré privádzajú do interiéru prirodzené denné svetlo. Spája exteriérové podmienky s interiérovými, takže je súčasťou obvodového plášťa. Z hľadiska denného osvetlenia pozitívne ovplyvňuje vnútorné prostredie, a preto je dôležité zabezpečiť, aby jeho zabudovanie nevytváralo problémový detail v obvodovom plášti. Ak sa svetlovod použije navyše v horskej oblasti, musia sa zohľadniť extrémne vonkajšie podmienky.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

One for your healthy and full life needs natural light, which affects the biological rhythm of man. Design of daylight should therefore be well thought out, to arrange visual comfort for the user according to the predominant visual activity inside the room. Therefore we try to bring daylight into the interior to a sufficient extent and quality, through window openings or light guides, which must be designed not only to the adequate size, but also must be properly positioned. Quantitative criterion for day light is daylight factor D, which is expressed in percentage. Daylight factor D is defined as the ratio of daylight illumination at a given point of the plane E intr [lx] on the present outdoor illuminance levels E extr [ lx] for known or expected sky brightness distribution. Direct sunlight is excluded in both measurements. Quantitative criterion is the uniformity of daylighting r [-], which indicates the ratio between the maximum and minimum values of daylight factor. Another quantitative criterion is the distribution of light, preventing glare, light reflectivity and color of surfaces. With decreasing the possibilities of new construction are currently being used in less attractive locations for the construction and much more likely to approach various types of reconstruction. Reconstruction will help us as saving energy for heating or other aspects of improve interior, we must be careful to the negative influence of daylight inside a room. Also, existing dense development gives us a big limitation for appropriate design of the interior with the qualifying conditions for a visual activity. In places not directly neighbouring on the exterior environment a suitable means of lighting are daylight guidance systems which may transmit light over long distances.

Detail

doc. Ing. Daniela Bošová, Ph.D., doc. Ing. Lenka Prokopová, Ph.D.

15124 Ústav stavitelství II

Nejslabším článkem panelových objektů jsou především jejich obvodové pláště, proto většina regenerací souvisí právě s rekonstrukcí stávajících obvodových plášťů. Jedná se zejména o výměnu okenních otvorů, dodatečné zateplení či úpravy předsazených konstrukcí vč. zasklení lodžií a v neposlední řadě i změnu barevnosti povrchové vrstvy fasády. Těmito úpravami určitě dokážeme zlepšit energetickou náročnost objektu, ale je nutné přihlédnout na sekundární negativní ovlivnění vnitřního prostředí z hlediska úrovně denního osvětlení. V této studii jsme se pokusili zohlednit jak šířku, tak tvar ostění okenního otvoru s přihlédnutím na vliv denního osvětlení uvnitř místnosti.

Detail