Living in 4D saves 2/3rds of the energy consumption
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If an average Danish family with an average energy consumption moves to a flat in the 4D building, the consumption of energy will decrease by 2/3 - without any change in the ’energy behaviour’ of the familiy.
From 22,000 kWh/year to 7,000 kWh/year for a family of four in a 130 m2 residence, due to:
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- The orientation and shape of the building - sunshine for the flats and offices in the shade.
- Energy efficient building envelope and a large building volume in proportion to the surface.
No thermal bridges and multifunctional windows.
- Passive climatizing in addition with heat recovery in the winter. Natural ventilation and night cooling most of the year + efficient sun screens.
- A+ white goods, ventilated cabinet for drying
clothes, and partial low-energy lighting.
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Calculation
Average family
- An average Danish family of four uses 5-6 000 kWh electricity per year.
- The building related energy consumption in an average Danish residence is 131 kWh/m2/year.
- If the residence is 130 m2 , the total energy consumption will be 17 000 + 5 000 = 22,000 kWh/year.
4D family
- By using the best available white goods (A - A+++), drying clothes in a tumbledryer with heat regain, and sometimes in a drying closet (see Household consumption) and changing 5 oldfashioned lightbulbs to LED - a family can reduce the electricity consumption by 2 000 kWh a year.
- The building related energy consumption in the 4D residences will be 25 kWh/m2/year.
- If the residence is 130 m2, the total energy consumption will be 3 250 + 3 500 = 6 750 ≈ 7,000 kWh/year.
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The consumption will drop even more if the familiy changes behaviour, and if energy producing units (eg. PV) are mounted on the building.
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