PRINCIPLES OF THE EXPOSURE NATURAL LIGHTING MODELING OF PREMISES

2020;
: 113-118
1
Kyiv National University of Construction and Architecture
2
Kyiv National University of Construction and Architecture
3
Kyiv National University of Construction and Architecture

It’s well known that a criterion of estimating the varying natural lighting is exposure equal to the product of light intensity by its duration. Here we have made studies into the exposure in the room depending on the orientation of a light aperture and its location in space. The exposure has been considered by the example of three identical office rooms with the same light apertures oriented north, west and south and having three positions – vertical, inclined and horizontal. To calculate the annual exposure we made use of the well-known software package VELUX Daylight Visualizer 2. For convenience of analyzing the exposure there was introduced the concept of the natural exposure coefficient (NEC) which is a ratio between the exposure in the room and a simultaneous value of the outer exposure. Our studies have shown that exposure is an effective criterion to assess the indoor natural lighting in time. The existing system of estimating energy consumption in lighting buildings with the help of a simultaneous lighting is rough and does not take into account such factors as orientation of light apertures by the sides of the horizon and their location in space. The use of exposure let us improve the method of calculating energy consumption in lighting premises taking into account the light aperture location in space and their as orientation by the sides of the horizon. The numerical experiment performed has given a predicted result, namely, the most power-consuming
room is the north-oriented one with the vertical light aperture and the least power-consuming room is the one with the horizontal light aperture. The room with the inclined light aperture has average energy consumption.

Chernova, N. М., Bylova, А. М. (2004). General Ecology. Moscow: Izdatel'stvo Drofa.

Kravkov, S.V. (1950). Eye and its Action. Moscow-Leningrad: Izdatel'stvo АN USSR.

Yegorchenkov V. (2009). Modelling of Natural Lighting of Building with Taking into Account the Time characteristics. Proc. VI Intern. Conf. Kharkov, 159-163.

Ioffe К.I. (2008). Biological Influence of Visual Light on a Human Being's Organism. Svitlotekhnika and Elektroenergetika, No.3, 21-29.

Natural and artificial lighting, DBN V.2.5-28:2018. State Building Codes of Ukraine (2018). Kyiv: Ukrarkhbudinform (in Ukrainian).

Natural and artificial lighting, SNiP 23-05-10. State Building Codes of Russian (2011). Moscow (in Russian).

PN-71/B-02380/ Oswietlenie wnetrz swiatlem dziennym.

Darula S. (2019). Review of the Up-to-Date State and Perspectives of Standardization in the Field of Natural Indoor Lighting. Svetotekhnika, No.6, 6-20.

Spatial distribution of daylight - CIE standard general sky: CIE S 011/E:2003 (ISO 15469:2004(E)) (2003). Vienna: CIE Central Bureau Vienna (CIE draft standard).

Jacobs A. (2012). Radiance Cookbook. 24 January, 2012.

Larson G. (1998). Silicon Graphics, Inc Rendering with Radiance: A Practical Tool for Global Illumination ACM Siggraph'98 Course № 33 Orlando, FL July 21, 1998.

Building Climatology and Geophysics. SNiP ІІ-А.6-72 (1973). Moscow: Stroiizdat (in Russian).

Energetic Efficiency of Buildings. Methods of Calculating the Energy Consumption at Warming, Cooling,

Ventilation, Lighting and Hot Water Supply: DSTU B А.2.2-12:2015 (2015). Kyiv: Ukrarkhbudinform (in Ukrainian).