In this research project an innovative approach for a roof- integrated heat absorber was analysed from a building physics viewpoint. Advantages, risks and potentials were evaluated and a concept for collaborative follow-up projects has been developed. The prototype analysed is mounted beyond the roof tiles. The pipe heat exchanger system is installed in a way that a direct to contact to the roof tiles is provided. On this sub-roof layer it absorbs energy from both sides, however on direct solar radiation most of the energy is absorbed by heat conduction directly from the roof tiles. A key advantage of this setup is the possibility to integrate solar collectors into building without any visible changes. This invisible approach can be especially beneficial regarding the energy-related refurbishments of historic or protected buildings. However the solution is also valuable for modern buildings. The potentially somewhat lower efficiency of the absorber can be offset by other advantages, such as architectural considerations, high endurance, simple installation, low maintenance requirements and others. Combined with a heat pump the system is able to support heating and cooling, as well as water heating. A genuine feature of the system is its capability to melt snow of the roofs with high efficiency. Keeping the surfaces clear of snow extends the potential operation time of the absorber and provides protection against damage by snow weight or freeze/thaw effects. Another beneficial effect is the potential temperature reduction in the roof and the enclosed space below. In the project all these aspects were considered and evaluated.
|Effective start/end date||26/02/14 → 16/02/15|