Passive House | DIDPROEKT

Following the executed surveys of the real estate we arrived at the decision described in the design.
The volume of the building is compact, with proportion (ratio of surface area and volume) S/V=0, 65, which is less than the volume of a cube with length of the wall of 9 m. The sunscreen devices along the southern facade are with changing inclination, not admitting sun rays in summer, and to the opposite admitting them in winter.
At the base of the southern facade, at the foundation of the wooden farms there is an inclination which we use to direct the reflected sun irradiation towards the building (in winter months).
Traditional houses in cold climate areas are with roofs inclined towards the unfavorable direction and windows mainly along the southern facade. We thus solved the inclination of the roof to the north.

We also use controlled forced ventilation by cooling/heating of the fresh air via ground air heat exchanger in the soil at a depth of 4 m where the temperature in winter months is between 5ºС – 10ºС, and in summer – between 10ºС -15ºС. The air heated in the house using a recuperator delivers heat to the incoming fresh air, so therefore recovery of the energy from the spent air is in place.
To achieve the high energy efficiency of recycling of spent heat, we use heat exchanger with the so-called counter-current or opposite scheme of movement of both flows – the supplied fresh external air and the spent internal air. Their efficiency reaches 95%, and minimum is considered to be 80% „back recovery” of the energy.