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Sökning: WFRF:(Vakouli Vaia)

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1.
  • Rogers, Paul, et al. (författare)
  • Moderniserad dagsljusstandard
  • 2018
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This report is the account of SBUF project 13209 “Moderniserad dagsljusstandard” (Modernized daylight standard). This is a continuation of the SBUF project 12966 “Förstudie dagsljusstandard” (Pre-study daylight standard) published in 2015. SBUF and the Swedish Energy Agency are the two sources of this project’s funding. The task has been to freely describe and interpret history, day-to-day and future development needs for daylight in buildings within the framework of the Swedish National Board of Housing, Building and Planning. The project has been a feasibility study in order to design a proposal on how to proceed towards creating an improved and modernized interpretation of BBR section 6: 322. The ultimate goal is a daylight standard applicable to the construction industry and functioning.
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2.
  • von Wachenfelt, Hans, et al. (författare)
  • Lighting Energy Saving with Light Pipe in Farm Animal Production
  • 2015
  • Ingår i: Journal of Daylighting. - : SolarLits. - 2383-8701. ; 2:2, s. 21-31
  • Tidskriftsartikel (refereegranskat)abstract
    • The Swedish animal production sector has potential for saving electric lighting of €4-9 million per year using efficient daylight utilisation. To demonstrate this, two light pipe systems, Velux® (house 1) and Solatube® (house 2), are installed in two identical pig houses to determine if the required light intensity, daylight autonomy (DA), and reduced electricity use for illumination can be achieved. In each house, three light sensors continuously measure the indoor daylight relative to an outdoor sensor. If the horizontal illuminance at pig height decreases below 40 lux between 08.00 and 16.00 hours, an automatic control system activates the lights, and electricity use is measured.. The daylight factor (DF) and DA are determined for each house, based on annual climate data. The mean annual DA of 48% and 55% is achieved for house 1 and house 2, respectively. Light pipes in house 2 have delivered significantly more DA than those in house 1. The most common illuminance range between 0 and 160 lux is recorded in both houses, corresponding to approximately 82% and 83% of daylight time for house 1 and house 2, respectively. Further, the daylighting system for house 2 has produced a uniform DF distribution between 0.05 and 0.59. The results demonstrate that considerable electric energy savings can be achieved in the animal production sector using light pipes. Saving 50% of electric lighting would correspond to 36 GWh or 2520 t CO2 per year for Sweden, but currently the energy savings are not making the investment profitable.
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