Interest in building an energy-efficient house has steadily increased in recent years. But what is it, and why is it a brilliant idea to have a climate-smart home?
An energy-efficient house refers to a building that uses less energy than what today’s building code (BBR) requires.
Passive houses are divided into three different classes: Classic, Plus, and Premium
- They are buildings that are passively heated by the sun
- They generate internal heat gains and make use of recycled heat in the ventilation system
- They provide a heating energy saving of up to 75% compared to buildings that meet the upcoming BBR requirements
The heating energy saving is achieved because the passive house concept is based on two fundamental principles: minimizing heat losses and optimizing heat gains.
With a well-insulated building envelope, triple-glazed windows with insulating frames, and an unbroken air-tight layer, it is ensured that the heat stays inside the house. A passive house also gains heat through solar radiation, body heat, and household appliances.
The passive house receives its fresh air via an FTX system with high heat recovery. The heat exchanger recovers at least 75% of the heat from the exhaust air and transfers it to the fresh outdoor air, resulting in a very low need for supplementary heating. In Sweden, the most famous example is Lindåshusen, located south of Gothenburg. In these row houses, there is only a small additional heat source for heating, with an installed capacity of less than 10 W/m².
To achieve heating with the help of passive heat sources, all heat leakage from the home must be minimized. In Lindåshusen, heat leakage is minimized through a specially well-insulated building construction. Windows and doors are also designed for maximum insulation, and finally, almost all the heat is recovered by the efficient ventilation system.
Plus and Premium, unlike Classic, are based on the house producing its own primary energy, for example with solar panels.
Kriterier för Passivhus Classic
- Specifikt årsvärmebehov max. 15 kWh/ m²år eller maximalt värmeeffektbehov 10 W/m².
- Luftomsättning vid provtryckning n50 maximalt 0,6 oms/h.
- Förbrukning av förnybar primärenergi maximalt 60 kWh/m²år
- Produktion av förnybar primärenergi 0 kWh/m²år
Kriterier för Passivhus Plus
- Specifikt årsvärmebehov max. 15 kWh/ m²år eller maximalt värmeeffektbehov 10 W/m².
- Luftomsättning vid provtryckning n50 maximalt 0,6 oms/h.
- Förbrukning av förnybar primärenergi maximalt 45 kWh/m²år
- Produktion av förnybar primärenergi minst 60 kWh/m²år
Kriterier för Passivhus Premium
- Specifikt årsvärmebehov max. 15 kWh/ m²år eller maximalt värmeeffektbehov 10 W/m².
- Luftomsättning vid provtryckning n50 maximalt 0,6 oms/h.
- Förbrukning av förnybar primärenergi maximalt 30 kWh/m²år
- Produktion av förnybar primärenergi minst 120 kWh/m²år
Vill du veta mer? Här hittar du mer information om passivhus.
