A PassivHaus is a building that provides a high level of occupant comfort while using very little energy for heating or cooling.
PassivHaus is an energy efficiency standard for both domestic and non-domestic buildings pioneered in Germany, that reduces space heating and cooling demand to such a low level that conventional heating or cooling system is no longer required. A PassivHaus building achieves up to 75% reduction in space heating requirements, compared to standard practice for UK new build.
A PassivHaus building must meet the following criteria:
SCP ensure design and assessment of compliance is done by the use of the following software:
The low heating demand of PassivHaus building of less than 15 kWh per m2 per year means that annual fuel costs are reduced to £25-75 on space heating per year for 2-3 bed property. When coupled with renewable energy sources, the total energy bills could be as low as £0 a year.
EnerPHit is a slightly relaxed standard for low energy retrofit projects where the existing building fabric and conservation issues make achieving strict PassivHaus Standards unfeasible. Both criteria are summarized below:
|Specific Heat Demand||≤ 15 kWh/m2 .a||≤ 25 kWh/m2 .a|
|Primary Energy Demand||≤ 120 kWh/m2 .a||≤ 120 kWh/m2 .a|
|Airtightness||n50 ≤ 0.6-1||n50 ≤ 1.0-1|