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What is Passivhaus?
byPiers Sadler
EnerPHit
EnerPHit
Passivhaus Criteria
Air-tightness 0.6ACH @ 50Pa1 ACH EnerPHit
Comfort
Surface temperature (windows)
>17oC Comfort
Summer over-heating Max 10% >25oC Comfort
Ventilation 30m3/hr/person ComfortHeating 15 kWh/m2/yr EnergyPrimary Energy 120 kWh/m2/yr Energy
Fabric first is embedded in these criteria
Passivhaus Criteria
• Whole building warm• No draughts• No cold radiant surfaces• Fresh air always• No summer over-heating• Heating bills ~£60/yr
Five Basic Principles
Comparison with UK Part L1A, 2013
Comparison with UK Part L1A, 2013ItemU values in W/m2K
Building Regs(typical)
Passivhaus(upper limit)
Walls U value 0.180.15
Roof/floor U value 0.13Windows U value 1.4
0.8Doors U value 1.0-1.2Airtightness 5m3/m2/hr 0.6 ACHThermal bridging moderate thermal bridge freeVentilation natural heat recoveryFabric energy efficiency(kWh/m2/yr) ~45-60 15
Building Form
Source: AECB Carbonlite, Passivhaus Designer Course
Common Misconceptions
You can’t open the windows
Sealed buildings are unhealthy
Mechanical ventilation is energy intensive/expensive
Heating is not required✗✗✗✗
Passivhaus Planning Package (PHPP)
Certification/Quality Control
PHPPDetail drawingsSupplementary modelling (thermal bridging)PhotographsAir test
Design & Construction Certification CompletionDesign Team
Performance Gap
Passivhaus
Source: Leeds Beckett University
Performance Gap
Source: Passivhaus Institute
Whole Life Costs (NPV)
Passivhaus NPV was always less than the typical house
Benefits
Passivhaus build by Keepmoat, OldhamSource: The Guardian
• Eliminates fuel poverty
• Low and predictable CO2 emissions
• High levels of thermal comfort
• Good indoor air quality
• Health dividend
So:What is Passivhaus?
• First rate thermal comfort• Exceptional energy performance• Excellent air quality• Delivers on design intent
Thank you
www.piers-sadler.co.uk