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‘Passive House’, or passivhaus as it is known in German, is a design standard that delivers healthy, comfortable and efficient buildings.
and it is gaining traction in Australia
Why do I like the Passive House standard?
Because it delivers measurable performance outcomes
Thermal comfort must be achieved during winter (20°C minimum) as well as in summer with not more than 10% of the hours in a given year over 25°C.
Heating demand 15kWh/m2/yr or heating load 10W/m2
Cooling demand 15kWh/m2/yr or cooling load 10W/m2
Humidity must not exceed 12g/kg for more than 20% of the year (~60%RH at 25°C)
Airtightness must be 0.6ACH50 or lower and be verified on site
Overall energy use - Primary energy renewable must not exceed 60kwh/m2/yr
The certification is carried out by a PHI-approved Passive House Certifier
Thick and continuous insulation provides proper thermal separation between the heated or cooled inside environment and the outdoors. This improves thermal comfort and reduces the risk of condensation.
The building envelope must achieve an extremely low air leakage performance (less than 0.6 air changes per hour at 50 pascal)
Mechanical Ventilation with Heat Recovery (MVHR) is the process of improving the indoor air quality without the need to open windows or doors.
Windows are literally a hole in your wall. While they can let in beautiful warming sunshine, they are also the weak link in any home.
This means keeping penetrations through the insulation to a minimum, and where it can’t be avoided, using low or non-conducting materials.
EnerPHit is the Passive House certification system for retrofits and renovations.
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