Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.01 vteřin. 
Metody validace goniofotometru se zrcadlovým systémem a vliv výsledných křivek svítivosti na energetickou hospodárnost budov
Grinaj, Lukáš ; Dubnička, Roman ; Smola, Alfonz
LIDC is an important characteristic of luminaires used in the design of new lighting systems. Mirror system goniophotometers with are based on the principle of reflection of light emitted from luminaires on the mirrors. The accuracy of the LIDC measurement is influenced by many factors. This paper deals with measurement errors which occur with this type of goniophotometer, then methods of validation of goniophotometers using a mirror system is proposed. Based on these validation methods,accuracy of the LIDC measurement on goniophotometer with mirror system can be increased. This paper also deals with the impact of the choice of LIDC measured on goniophotometer with mirror system to the quality of interior lighting systems in the framework of the energy performance of buildings. The term energy performance of buildings means the amount of energy needed to meet all the energy needs associated with a standardized usage of the building.
Vztah goniofotometrů blízkého pole k jednotkám SI
Dubnička, Roman ; Rusnák, Anton ; Grinaj, Lukáš ; Smola, Alfonz
Goniophotometry is one of the basic photometric measurements in lighting engineering. Aim is to measure spatial characteristics of luminous parts of the luminaires and light sources represented by luminous intensity distribution curve which is needed for lighting computation at level of the preparation of lighting design. Near-field goniophotometry is still a forthcoming technology widely used in photometric laboratories all over the world. Due to compact design of these systems the laboratory space can be saved and they can be installed in a room of usual dimensions because they do not obey the inverse square law from point of view of the whole dimension of the luminaire. The principle of these goniophotometers of the luminance distribution is measurement of luminous part of the luminaires and light sources. By integration over solid angle from this fundamental photometric quantity luminous intensity in particular direction in the space represented by two angles depending on measurement planes is derived. Although theoretical principle and physical model is well-known and defined, in practical realisation of this system some problems occur. One of the problems is traceability to SI units. This fact disqualifies near-field goniophotometer in standards relating to goniophotometry. The methods to prove that near-field goniophotometer works are mostly based on computer simulations compared with practical measurements. But in the practice, appropriate calibration method with traceability to the SI units is still not available, unlike it is clearly used for farfield goniophotometers. The paper describes possibility of the calibration of near-field goniophotometers to SI units by standards which should provide fully traceable calibration to the base. Also method of validation of near-field goniophotometric systems is still opened question for future work. At the present, further works continue on the method of validation in the framework of that CIE Division 2 but this topic is out of scope of this Paper.
Vnitřní pracoviště bez denního osvětlení: Skutečný problém
Dubnička, Roman ; Smola, Alfonz ; Lipnický, Lukáš ; Barčík, Michal
In general, lighting systems are subjected to verification of photometric parameters after installation what is usually performed by field trial according to lighting project as required by the standard EN 12464-1. Illumination of indoor workplaces is normally based only on artificial lighting without access of daylight through windows or rooflights. To achieve good visual performance for workers, higher illuminance level at the workplace is required. Moreover, in some countries these requirements to photometric parameters shall follow legislative documents which prescribe illuminance level at the workplace. In Slovak Republic the legal requirement for total maintained illuminance is 1 500 lx for indoor workplaces without daylight if any alternative arrangements are not ensured for the workers and long-term stay of persons is declared at the workplace what should reduce health impact of the persons in that space without daylight. This is controlled by the Public Health Authority as one of the requirements for commissioning of the building. More luminaires with appropriate light sources can easily satisfy that illuminance level. But on the other hand, energy consumption for this lighting system is much higher what negatively influences the classification according to the system for energy performance of buildings as requirement of the EU directive 2010/31/EC.Requirements for lighting systems are stated in the document EN 15193. This paper puts focus on workplaces without access of any daylight. Measurements of photometric parameters of lighting systems were performed with respect to the energy performance of building according to requirements of the standard EN 15193. Based on analyses of the results energy performance of lighting systems will be figured out. Suggestions to possible options how to satisfy legislative and normative requirements with respect to lighting systems used in illumination of indoor workplaces will be also presented.

Viz též: podobná jména autorů
3 Smola, Adam
1 Smola, Albert
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