Passive House: Trend and Future

Passive House: Trend and Future

Whether Energy Saving or Economy - in recent years, every consumer will surely have multiple terms belongs. With the increase of the world population and a rising standard of living, people have to take more and more account of their environment. So far, one could realize the dream of owning a home without much planning and without strict rules. In Germany, this is no longer possible, new buildings must follow many guidelines, which are regulated in the Energy Saving Ordinance EnEV. The Passive House , which until recently was mainly a trend, has now become a reality and a future. It is basically a modern house that, thanks to its design and technology, uses little energy - to the benefit of its inhabitants and the environment.

Zero: e park: Europe's largest zero emission settlement

Hannover-Wettbergen is currently building around 300 Homes of Germany and Europe largest passive house housing estate . As informed by, the aim of the project is to create competitive housing for single-family homes - all with the lowest possible, CO2-neutral additional costs. The required household electricity is to be purchased via a currently inactive hydropower plant, which is to be reactivated. In addition to the CO2 neutrality, the construction area is to ensure a high quality of life with the help of large green areas and an exemplary water concept.

The Passive House is more than just a home, it is a

building standard that is energy-efficient, economical and environmentally friendly at the same time, without the need for the occupants to sacrifice comfort. Unfortunately, the passive house is not a brand name, but only a construction concept , which everyone can use. So it can happen that companies advertise passive houses that are not really faithful to the concept. The advantages of a passive house at a glance:

Passive houses consume up to 90 percent less heat than conventional buildings.

  • In comparison Up to 75 percent of heating energy can be saved for new buildings.
  • Heating energy consumption is only 1.5 liters of heating oil equivalent per square meter of living space - many times less than the value of a low-energy house.
  • The building envelope is particularly effective and keeps the heat in House.
  • It uses existing energy sources such as incoming solar heat and body heat of persons.
  • A modern ventilation system ensures consistently fresh air
  • Quality requirements for the passive house

Passive houses must meet basically three requirements:

create comfortable indoor climate without separate air conditioning and heating system: The annual heating demand may not exceed 15 kWh / (m²a

  1. Comfort criteria must be met throughout the house at all times of the year. The following requirements apply here:
  2. Opaque outdoor components must have U-values ​​less than 0.15 W / (m²K).
    • The values ​​of windows and other transparent components must be less than 0.8 W / (m²K) .
    • In the room, the supply air temperature at the air outlet must not be below 17 ° C. At the same time, the air hygiene according to DIN 1946 must be fulfilled. The noise load of the ventilation system must not exceed the value of 25 dBa.
    • There must be an open external air opening in each living room. In addition, there must be a flow of outside air through the apartment.
    • Translucent surfaces to the west and east (± 50 °) as well as all surfaces with a slope of less than 75 ° may need to have temporary sun protection.
    • The primary energy input for According to the Passive House Planning Package (PHPP), the household must not be higher than 120 kWh / (m²a).
  3. Solid construction or wooden house?

One thing in advance

: Each design has advantages and disadvantages. Basically, wood belongs to the more environmentally friendly building materials, but passive wooden houses are slightly more expensive than their massive variant. According to a study by ILS NRW, interested parties pay 30 euros more per square meter of living space. An overview of the advantages and disadvantages of both versions: Passive House made of wood Advantages

: short construction time (due to prefabricated parts)

  • joints can be well insulated
  • great design freedom
  • more or less weather-independent
  • Use of a renewable raw material
  • Highly achievable airtightness
  • Good ecological balance
  • Passive house made of wood Disadvantages

: comparatively poor sound and fire protection (production-dependent)

  • necessary installation of a vapor barrier
  • more susceptible to pest infestation (fungi, insects)
  • passive house solid benefits

: relatively easy to achieve airtightness

  • load capacity and stability
  • relatively good sound and fire protection
  • Passive house massive disadvantages

: high primary energy demand for production

  • comparatively high workload on the construction site
  • energy savings and costs

builders who decide on a new building, ste the choice between the

passive house standard and many other alternatives. The following table (source of the data) should clarify how much you can save when choosing a passive house or how low your living costs are. Building standard

kWh per m² of living space liters of heating oil per m² of living space Energy requirement: m3 gas for 100 m² of living space Energy costs for 100 m² of living space Passive house
15 kWh 1.5 l 150 m3 161 euros Energy efficient house KfW 40
40 kWh 4 l 400 m³ 343 Euro Energy saving house KfW 60
60 kWh 6 l 60 m³ 471 Euro Low Energy House
70 - 100 kWh 7 - 10 l 700 - 1,000 m3 536 - 716 Euro Buildings from the 1980s
150 - 200 kWh 15 - 20 l 1,500 - 2,000 m 3 996 - 1,276 euros Buildings from the 1960s
200 - 300 kWh 20 - 30 l 2,000 - 3,000 m & supmin; 1,276 - 1,817 Euro Passive House Funding by the Federal Government, Länder and Local Authorities

Passive Houses are the future and are now being built generously promoted. Those interested can benefit from nationwide, local and state-specific

subsidies . The Kreditanstalt für Wiederaufbau (KfW) plays a major role in nationwide funding and offers interested parties low-interest loans. Energy-efficient new buildings are funded with up to 50,000 euros, for renovations there is a maximum of 75,000 euros. Home builders and restorers must apply to their house bank.

An overview of current subsidies can be found in the funding database of the Federal Ministry of Economics and Technology. Interested parties should ask the competent local office for subsidies from the municipalities and countries.

Why passive houses are the better energy-efficient homes

Finally, the only question left is why passive houses are the better

energy-saving houses . In principle, it can be expected that the future trend will lead to reduced energy consumption. Although homeowners who opt for a passive house today must invest more, in the long term the investment will be released. On the one hand, there are numerous subsidy measures available, on the other hand, their energy consumption is many times lower than in a conventional house. In view of rising energy costs, it is precisely this low energy consumption that is so attractive. Increasing costs for electricity and heat will reduce the burden on passive house owners. Artikelbild: © pixinoo / Shutterstock