The article reviews the potential of light pipe system as a daylighting approach in buildings and presents results of experiments on performance of tubular light pipe prototype. The main task is focused on an examination of the system light efficiency on the basis of long-term illuminance measurements. The data from the measurement give overview about the potential of the light guiding system for direct solar radiation. For temperate climate with dominant cloudy sky conditions the light guide shouuld be completed with sun tracking system to increase efficiency. Streszczenie. W artykule zaprezentowano możliwość zastosowania światłowodu do oświetlania pomieszczeń w budynkach. Badano przede wszystkim skuteczność oświetlenia na podstawie długoczaswych pomiarów. W przypadku zachmurzonego nieba system powinien współpracować z układem śledzącym położenie słońca. Badania możliwości zastosowania światłowodu do oświetlania pomieszczeń.

A light pipe prototype with a concentrating mirror parabolic head was tested for temperature profiles. The purpose of the testing was to find maximal temperature and estimate potential problems for overheating in the position of the pipe installation into roof structures. Infrared thermography monitoring of the light pipe prototype and temperature measurements give overview about the light pipe system temperature distribution. It was proven that the light pipe head temperature was increased for more than 100°C in thermally insulated structure under intensive infrared radiation.

Results of daylight illuminance measurements of the field testing of two light guides with different roof installations is presented in the article. The first one is a common tubular system with a glass roof dome and the second one is a new light guide prototype with a concentrator head. The daylight illuminance was measured in a test chamber with the light guides installation. The measurements were carried out at the end of a summer season from August to September 2017. The measured data show differences in the daylight illuminance of the two tested light guides. The measured data were compared with simulation outputs in software Holigilm. In summary, it was found that the common light guide is about 37 percentage more efficient in light transmittance compared to the new light guide prototype. In temperate climate with dominant cloudy and partly cloudy daylight conditions the common light guide transmitted more light that the device with the concentrator head which reduced light transmission much more.

The article reviews the potential of a light guide system equipped by a concentrator device capturing daylight applicable for illumination of building interiors and presents results of experiments on performance of its prototype. The main goal is focused on the comparison of traditional solutions and newly developed prototype of the light guide system and presents examination of its light transmission efficiency based on the laboratory experiments.