50746219 Overview on Passive House for PHAI

8/6/2019 50746219 Overview on Passive House for PHAI

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Introduction to the Passive House Standard

Newgrange, a 5,000 year old monument celebrating

the importance of passive solar gain


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Advantages of Passive Houses:

Very low heating costs Reduced carbon emissions

High comfort Healthy indoor living environment

Bright airy buildings

Prolonged building life

Excellent sound proofing


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To put it simply, Passive Houses

Use 60% less heating energy than dwellings

built to Part L

Provide very high levels of Comfort and

health

Are affordable to build


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how does a passive house work?

If you minimise heat losses and maximise solar gains, you can reduceheating demand very significantly


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Passive House Design Principles

- Optimize solarorientation

- Build a compact form

- High insulated and airtight fabric

- Avoid thermal bridging

- Use efficient heating/ventilation system


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filter

thermal

insulation

passive

solar gain

throughwindows

ventilation

with heat

recovery

fresh air exhaust air

supply air

extract

air

Passive House Schematic Composition

air tightconstruction

Avoid thermal

bridges at all

junctions


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Highly insulated fabric

conventional passive houses


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Triple glazed with overall U-value

< 0.8W/m2

K Typically double low-E coating,

argon filled

Special low conductivity spacers

Double-gasket for airtightness

Frames thermally broken

High Performance Windows


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Build it tight...

Blower Door Testto measure level of air tightness

Level required is 0.6 ACH @ 50

Pascal (n50, not q50)


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Thermal Bridge Free Detailing

- Reduces heat

loss

- Improves

surface

temperatures

- Enhanced

comfort

- Eliminates risk

of mould


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Passive house standard Some Specifics

Maximum Space Heating Demand of15 kWh/m2/yearOr

Maximum Heat Load of10 W/m2 (normally 100 W/m2)

Maximum Primary Energy Demand of120 kWh/m2/year(for all energy needs, including appliances!)

Minimum Airtightness of0.6ACH @ 50 Pascal (n50, not q50)


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Passive House

House

Passive House

Apartments

Passive HouseSchool

Passive House

Factory

Passive House

Church

Passive House

Offices

Passive House

IndustrialPassive House

Retrofit

Passive House is not just for Houses


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Tesco SupermarketTramore, Waterford

Joseph Doyle Architects

Worlds 1st PH Supermarket


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All projects have to be modelled with the

passive house planning package (PHPP)

PHPP the essential design tool


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Retrofitting to the Passive House Standard

Social Housing

Project, Newry


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How does Passive House

compare to other standards? Conventional energy standard (65kWh/m2/year for space

heating)

Low energy (40kWh/m2/year for space heating)

Passive House (15kWh/m2/year for space heating)

2013 Carbon Neutral (on-site production of sufficientrenewable electricity to cover all primary energy needs except white and

black goods)

Net Zero Carbon (enough renewable electricity to cover allprimary energy needs as well as all embodied energy )

Living Building International Living Building Institute, Oregon


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Policy Context:

Irish Department Of EnergyDraft National Renewable Energy Action Plan:

June 2010


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Carbon Neutral Likely to require two elements:

1. Passive House Building Envelope 2. Renewable Energy Supply


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50746219 Overview on Passive House for PHAI

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