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Main components of an energy saving house
Compact shape and good insulation: All parts of the building envelope are insulated sufficiently to assure the heat transfer factor (U-value) less than 0,15 W/(m2K).
Southerly position and usage of sun screens: Passive usage of solar energy is essential in design of an energy saving house.
Energy saving window glasses and frames: The U-value of windows (the average of frames and glasses) must not exceed 0,85 W/(m2K), with the solar heat gain coefficent 50%.
Airtightness of the building envelope: Air leakage through various gaps should be less than 0,6 volume of the building in an hour (n50<0,6 h-1).
Preheating of fresh intake air: Fresh air can be led into the building through underground ducts, which collect heat from the ground. This way the intake air will heat above 5? even on cold winter days.
High efficiency exhaust air air-to-air heat exchanger: Most of the heat of the exhaust air is transferred to the intake air with 80% efficiency.
Renewable energy is used for the warm water supply system: Solar collectors, heat exchangers or biomass furnaces.
Energy saving home appliances: Energy saving refrigerators, stoves, freezers, lamps and washing machines are irreplaceable in a passive house.
Ceilings 0,09 W/(m2K)
Walls 0,13 W/(m2K)
Windows 0,85 W/(m2K)
Floors 0,09 W/(m2K)
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