![]() In Community Research and Development Information Service CORDIS: Winterthur, Suisse, 2003 Available online: (accessed on 22 August 2013). Integrated Light Pipe/Passive Stack Ventilation/Solar Heating Cooling Unit on Pilot-Plant Scale (TRIPLESAVE Unit) and Related Know How. Daylighting using light pipes and its integration with solar heating and natural ventilation. ![]() In Proceedings of the International Daylighting Conference, Ottawa, ON, Canada, pp. Overview of Hollow Light Guide Technology and Applications. This substitution gives possibility for simple thermal evaluation of the tubular light pipes in roof constructions. The thermal transmittance of the studied light guides in the whole roof area was substituted with the point thermal bridges. The simulation results confirmed the thermal bridge effect of the tubular light guide tube inside the insulated flat roof details. Tubular light guides of smaller diameters have lower heat transmission losses compared to the wider ones of the same lengths with the same outdoor temperature being taken into account. The CFD simulations resulted into conclusions that the growing ratio of length/diameter increases the heat transmission loss/linear transmittance as much as by 50 percent. The turbulent model was applied despite the small heat flux differences between the turbulent and laminar model. The physical model of the tested light guides of lengths more than 0.60 m proves shows that Rayleigh numbers are adequate for a turbulent air flow. A computer CFD model focused on the evaluation of temperature distribution and air flow inside tubular light guides of different dimensions was studied. Despite their many positive indoor climate aspects they can also present some problems with heat losses and condensation.
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