Because of the latest technology the house special wall and roof insulation has a very low heat transmittance coefficient characteristic (U = 0.1 W/m2K). It is well known that the greatest energy loss is generally caused by inadequate insulation. The thick insulation protects not only against winter cold, but summer heat also.
The show house has central heat recovery ventilation system which differs from the generally offered central ventilation systems. The intake of fresh air goes through a 100 m long tube placed 2 m deep in the ground (“ground heat collector”). Thus the intake fresh air is pre heated, before it gets to the ventilation equipment, saving a lot of energy in the winter. On warm summer days, the system works opposite, the constant temperature of the ground cools the hot air circulating in the pipes and a bypass system lets this cooled fresh air in the house through filters.
Generally we do not offer this heat recovery ground collector system with our Energiehome+ construction, because every building site is different, (the available space etc…) and the costs of this system have to be taken into consideration also.
The demand of remaining energy is covered by solar system on the southern roof plane. The generated DC electrical energy converted to AC electrical energy, which can be fed to the electrical network through the ammeter. The solar collectors produce most of the energy needed for the domestic hot water supply.