Passive House Design for Energy Efficient Buildings

What is Passive House?

A voluntary standard for energy efficiency in a building, which reduces the building's ecological footprint. It results in ultra low energy buildings that require little energy for space heating or cooling.

Passive House is a standard that opens up completely new perspectives for architects and engineers. The industry is responding positively to Passive House is driven market needs by developing highly efficient, pioneering products and making them available on the market. Passive House, as such, drives economies and innovation. An investment in comfort and efficiency thus adds value throughout the supply chain.

Where does Passive House standard apply?

The standard is not confined to residential properties; several office buildings, schools and supermarkets have also been constructed to the standard. Passive design is not an attachment or supplement to architectural design, but a design process that integrates with architectural design.

Which are the main Passive House features?

  1. Space Heating Demand should not exceed 15kWh annually or 10W (peak demand) per square meter of usable living space. This is the equivalent of 1.5m3 of natural gas per square meter of living space.
  2. Space Cooling Demand should roughly match the heat demand with an additional, climate-dependent allowance for dehumidification.
  3. Primary Energy Demand should not exceed 60kWh annually for all domestic applications (heating, cooling, ventilation, hot water and electricity) per square meter of usable living space, being produced by renewable energy resources.
  4. Airtightness with a maximum of 0.6 air changes per hour at 50 Pascals pressure.
  5. Thermal Comfort must be met for all living areas year-round with not more than 10% of the hours over 25°C without the use of active cooling.

How does Passive House achieve this performance?

  1. Correct orientation of the building, with shading elements above windows to the North and minimal openings to the South
  2. Building envelope enclosed by insulation without interruption
  3. Thermal break windows with double or triple glazing
  4. Glazing allowing the exploitation of solar energy
  5. Thermal bridge-free design
  6. Mechanical ventilation with heat recovery
  7. Filtered circulating air

Buildings that meet the Passive House standard use approximately 80% less energy than equivalent conventional buildings and provide superior air quality and comfort. The ventilation system recovers residual energy from indoor air before pushing that out and uses it to condition the incoming air. Thanks to the quality insulation and efficient ventilation system, Passive House remains warm on cold days and comfortable and cool on warmer days.