It is equipped with a thermal solar collector system, a cooling system, two heat stores and a floor heating system. The heating system consists of an array of 4 solar flat plate collectors faced towards the south, with an aperture area of 5.3 m 2 . The Sun-Lab and the solar collectors are shown in Fig.1. On the north side of the roof an array of 8 modified solar flat plate collectors are installed, with an aperture area 10.8 m 2 . They are part of the water-based cooling system, and the modified design enhances the emissive cooling capacity of the collectors.
Pure water is both the heat carrier fluid and the storage medium of the heating and cooling systems.
The water is collected in heat stores inside the house. A schematic description of the complete setup is shown in Fig.2. The setup allows switching between a 1000 liter aluminium storage and a smaller 300 liter hot water tank, and both the cooling and heating systems can be connected to the two storages. A schematic description of the heating and cooling systems at the Sun-Lab. A low temperature floor heating system with water as a heat carrier has been installed.