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Passivhaus for Planners
Transcript of Passivhaus for Planners
Annual Heating Demand
Measured in kWh/m2/yr Chris Parsons
FCIOB Chartered Architects
Chartered Building Consultants
Certified Passivhaus Consultants
Planning Consultants What is Passivhaus ? It's an energy and comfort standard and nothing else Passivhaus
Overview The CSH covers nine categories of sustainable design:
Energy and CO2 emissions
Surface Water Run-off
Health and Wellbeing
Ecology Passivhaus, Sustainability and Code Code for Sustainable Homes Annual heating demand heat load Total Primary Energy or Elements of
a passivhaus high levels of
insulation air leakage to below 0.6
air changes per hour The avoidance of thermal bridging The use of MVHR to provide constant fresh filtered air The use of passive solar
and occupancy gains Passivhaus Comfort - Aside from very low energy bills, the houses are very comfortable environments because:
Filtered fresh air is provided 24/7 throughout the house, ideal for allergy sufferers but also great for everyone else
the air is circulated at very low velocity to prevent drafts and to prevent fan noise.
Windows and doors and all internal surfaces are warm to the touch, including the glass, (>16.5º) giving better use of the space
Surface temperatures avoid or eliminate mould growth, leading to lower maintenance costs and significant health benefits
The absence of, or reduction in, radiators and heating appliances facilitates the free use of space.
The build quality, including windows and doors, air tightness and insulation provides a very quiet environment and lower maintenance costs Wimbish Passivhaus Annual gas cost for space heating and domestic hot water:
Houses : 2478 kWh < £150
Flats : 1390 kWh < £60 Over 20,000 certified passivhaus
but.... Only 53 certified in the UK Passivhaus Ditchingham So, what are the Architectural implications? Conclusion 2: The architecture of tomorrow will be driven by sustainability constraints. In energy terms this is likely to mean: Greater emphasis on insulating materials Increased emphasis on solar orientation A more solar driven fenestration Solar shading to avoid overheating Thermally efficient envelopes But these can be relatively subtle and can be accommodated in a range of idioms Conclusion 1: Passivhaus is a low energy, sustainable option for constructing buildings that use around 1/10th of the energy requirements of average buildings It can be delivered in any idiom or vernacular style, within some limited constraints. By addressing operational energy, the savings continue to accrue over the lifetime of the building It addresses serious issues of fuel poverty The increased cost will settle at around +3-5% It delivers a high quality, healthy and comfortable environment for occupiers The higher quality of build and components reduces maintenance costs Passivhaus for Planners of which 28 are ours! Passivhaus is a fabric first approach No specific need for renewables Highly efficient fabric reducing operational energy requirements Merton rule? Passivhaus standard is now mandatory in
Frankfurt and many other German areas
Recommended in London Borough of Camden