Passive Houses are very well insulated and draughtproofed buildings whose annual space heat demand is so low that conventional heating system can be omitted. The small amount of heat still required can be delivered to the individual rooms by heating the air supplied by the ventilation system. This will work, when the space heating energy demand is up to 15kWh/m²a) (kilowatt-hours per square meter of floor area per annum). The construction of a Passive House is very demanding in terms of the performance of building components used. The following refference values apply to the Central European climate. The principles are valid in other climates as well.
Simply combining appropriate components is not sufficient to construct a building as a Passive House – the integration as a whole is greater than the sum of the individual parts. The component interaction necessitates an integral plan in order to achieve the Passive House standard. This is the purpose of this Passive House Planning Package.
→ high R-Values ≥ 38 (ft2*h*0F/Btu) / U-Value= 0.13 W/m2K
→ minimize heat loss trough surfaces
→ minimize air leakages to ≤ 0.6 times the house volume per hour
→ solar heat gain
High Energy Efficient Windows
→ U ≤ 0.15 (Btu/ ft*h*F)/ U(METRIC)= 0.85 W/m2K
Average power cost (kWh): $0.08
Average Canadian home: $2039
Passive House Standard: $222
By the standard, the heat demand for a passive house should not be higher than 15 kWh/(m²*yr) (4755 Btu/ft²*yr).
Wood fibre (loose)
Wood fibre board
Strawbayle (not structural)
Fresh air can be brought into the house through a ground source heat exchanger. This preheats fresh air to a temperature above 41°K (5º C), even on cold winter days.
Cold fresh air is heated up by the warm used air (without blending) by a highly efficient heat recovery cross-flow plate heat exchanger (efficiency min 80%) almost to room temperature
The rest of the maintaining energy in the exhaust air is taken from a highly efficient mini heat pump (1-3 kW) to heat up the domestic hot water
The compact unit can be combined with geothermal or solar if necessary.
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