What is Passivhaus? by Piers Sadler. EnerPHit Passivhaus Criteria 50Pa 1 ACH EnerPHit Comfort Surface temperature (windows) >17.

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Presentation transcript:

What is Passivhaus? by Piers Sadler

EnerPHit

Passivhaus Criteria 50Pa 1 ACH EnerPHit Comfort Surface temperature (windows) >17 o CComfort Summer over-heatingMax 10% >25 o CComfort Ventilation30m 3 /hr/personComfort Heating15 kWh/m 2 /yrEnergy Primary Energy120 kWh/m 2 /yrEnergy 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

Item U values in W/m 2 K Building Regs (typical) Passivhaus (upper limit) Walls U value Roof/floor U value 0.13 Windows U value Doors U value Airtightness 5m 3 /m 2 /hr0.6 ACH Thermal bridging moderatethermal bridge free Ventilation naturalheat recovery Fabric energy efficiency (kWh/m 2 /yr) ~

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 PHPP Detail drawings Supplementary modelling (thermal bridging) Photographs Air test Design & Construction Certification Completion Design 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, Oldham Source: The Guardian Eliminates fuel poverty Low and predictable CO 2 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