Passivhaus buildings provide a high level of occupant comfort while using very little energy for heating and cooling. They are built with meticulous attention to detail and rigorous design and construction according to principles developed by the Passivhaus Institute in Germany, and can be certified through an exacting quality assurance process.
The Passivhaus Standard requires:
- a maximum space heating and cooling demand of less than 15 kWh/m2.year or a maximum heating and cooling load of 10W/m2.
- a maximum total primary energy demand of 120 kWh/m2/year.
- an air change rate of no more than 0.6 air changes per hour @ 50 Pa.
To achieve the Passivhaus Standard in the UK typically involves:
- very high levels of insulation
- extremely high performance, certified windows with insulated frames
- airtight building fabric
- 'thermal bridge free' construction
- a mechanical ventilation system with highly efficient heat recovery
Bridge Architects director Russell Bridge was awarded Passivhaus Certified Designer status in Aug 2011. We would be delighted to talk further about any potential Passivhaus, or very low energy schemes you may have.