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Passive house

Resources:
Energy
Sector:
Construction
Cost:
High cost
Payback time:
15 Year(s)
Read more
Resource savings: Energy:
Heating energy consumption is ca. 75 % lower compared to average new buildings.
Associated cost savings: Energy:
60 - 75%
Payback time:
Payback time for the very-low energy house, such as passive house, is approximately 15 years.
Total cost savings:
The Life Cycle Assessments have shown that passive houses have lower life cycle costs, but calculation varies widely depending on energy prices.
Co2 emission reduction:
The Life Cycle Assessments demonstrate that very low-energy houses in general have a lower environmental impact than conventional houses as they use less primary energy and cause less greenhouse gas emissions over a time span of 30 years.
What is in it for you:
Designing buildings for a passive house concept is an effective way to save on operating costs. Passive houses are slightly expensive (5-10 %) than regular houses, but the consumption of heating energy is much lower with a relatively short payback time.
Descriptive information:

Passive House is a building that does not require much conventional building heating on account of its thermal insulation and airtightness with very energy-efficient windows and ventilation system. Passive house uses more often electrical heating with air heat pump because of low heating energy consumption. However, a passive house can even be connected to a geothermal heat pump.

When compared to average new buildings, passive houses use about 60-75 % less heating energy compared to a regular house. The comparison does not include the heating of household water, which is about the same for both house types.

Passive house is not a registered trademark and term has few different descriptions on different climate zones. In Central Europe, the German Passive House Institute has set international definitions demanding that space heating energy demand should not exceed 15 kWh per square meter of net living space (treated floor area) per year or 10 W per square meter peak demand. The Passive House Institute and its approved local representatives grant certificates for houses that follow the approved rules. In Northern Europe, with a much colder climate, the term “passive house” is used also for houses with slightly different requirement. In Sweden, Norway, and Finland the heating energy demand should not exceed for example between 20-30 kWh per square meter of net living space.

Common for all passive houses is the airtightness value of maximum of 0.6 air changes per hour at 50 Pascals pressure (ACH50). Standards don’t set exact demands on the design features to achieve these goals, but typically the houses need to have well-insulated building envelope for minimal heat losses, compact shape with no thermal bridges, energy-efficient windows facing sun allowing the use of passive solar gains and good air tightness for controlled ventilation and reduction of heat losses. Passive houses demand careful design of structures and implementation.

Passive house designs have been used extensively in residential houses but there are also examples of other types of buildings. Passive house standard doesn’t limit the use of buildings, although some design limitations on corners or large window surfaces may be needed.

Designing buildings to meet the passive house concept is an efficient way to save on running costs. Passive houses are typically only 5-10 % more expensive than conventional ones, but as the heating energy consumption is ca. 75 % lower, the payback times are relatively short. With high energy prices which are likely to rise in the future, life cycle costs are much lower than in a conventional house. Payback time for the very-low energy house, such as a passive house, is approximately 15 years.

Sources

Passive House institute, The independent institute for outstanding energy efficiency in buildings, homepage: https://passivehouse.com/index.html

Passipedia – The Passive House definition (2018): https://passipedia.org/basics/the_passive_house_-_definition

Very Low-Energy House Concepts in North European Countries, booklet (PDF) provided by IEE project NorthPass (2012): https://ec.europa.eu/energy/intelligent/projects/sites/iee-projects/files/projects/documents/northpass_low_energy_house_concepts_en.pdf

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