15 September 2011


In historic cities, like scenic UNESCO Cultural World Heritages, and for buildings, protected as ancient monuments, the application of Solar Panels and insulation measures is
mostly restricted or not possible due to the architectural structure oft he surface and the general presentation of the protected area. Such city areas are typically closely overbuilt and
also the application of ground source probes or wood boilers are not allowed. In order to keep the possibility to use renewable energy, a special heat collecting system has been developed: the “roof tile collector”. The special designed roof tiles are of copper material and have a good capacity to collect the ambient heat from sun absorption, air, rain water and air

The “roof tile collector” brings the collected heat (or cold) through a circulating working fluid to the heat pump, which provides the required temperature for the heating or cooling circuit. The heat pump works principally like a brine/water ground source heat pump. Adequate to the special conditions of the primary side “roof tile collector” the heat pump, the system
components and the electronic controller have to be carefully adapted. The presentation shows the special construction of the used roof tiles and how to use them as a collector, the
specific system design, the adapted heat pump parameters and the results in temperature profiles, coefficient of performance and seasonal performance factors of the pilot installation.
Good practice is shown by installations in Switzerland and Germany. The “roof tile collector system” is a proven new alternative for heat pump application, especially under restricted architectural conditions.