2011 marion baeli passivhausuk

7/27/2019 2011 Marion Baeli PassivHausUK

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2011 www.pauldavisandpartners.com

Princedale Road!PassivHaus retrofit

in a London Conservation area

Marion Baeli


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Paul Davis + Partners:

A 99 strong London-based practice known for its skilful integration of contemporary architecturewithin historic environments.


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1. OBJECTIVEOFTHEPROJECT(Retrofit for the Future)2. CONSTRAINTSAND OPPORTUNITIES3. PROPOSALFOR PRINCEDALE ROAD4. COSTANALYSIS5. CONCLUSION

Content


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80% CO2 reduction

1. OBJECTIVE

Source of CO2 emissions in a standardVictorian House

A Retrofit for the Future ProjectAim to demonstrate if and how 80%+ emission

reductions can be achieved in existing housing stock


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EnglishHouseCondi/onSurvey2007

EnglishHouseCondi/onSurvey2007EuropeanCommuni/esPVGIS

25,000,000

dwellings

21% of the stock is Pre-1919Thats 4.7 million houses

30% of total emissionsVictorian housing stock emit themost with 43,000,000 tCO2/y9t of CO2/yr/house480 kWh/m2/yr (on average)Pre-1919 stock highest emitter

1. OBJECTIVE - CONTEXT


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EnglishHouseCondi/onSurvey2007

MainFuelType

1. OBJECTIVE


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Carbon emission reductions from energy efficiency improvements to the UK housing stock BRE report BR435. 2001.

History shows we have already addressed comfort once

40 years 40 years

1. OBJECTIVE


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2. CONSTRAINTSANDOPPORTUNITIES


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Location Central London



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Royal Borough of Kensington and Chelsea Conservation Area Map

Conservation area context



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Planning Policy Statement 5 - Historic Environment HE1.1 Local planning authorities should identifyopportunities to mitigate, and adapt to, the effects of

climate change when devising policies and making

decisions relating to heritage assets by seeking the reuseand, where appropriate, the modification of heritageassets so as to reduce carbon emissions and securesustainable development.



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3. PROPOSAL


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100

102

3. EXISTING HOUSE


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Basement Plan Ground Floor Plan First Floor Plan Second Floor Plan

Up Up Up

Up

3. EXISTING HOUSE


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3. EXISTING HOUSE


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3. EXISTING HOUSE


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3. EXISTING HOUSE


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1

2

3

4

Basement Plan Ground Floor Plan First Floor Plan Second Floor Plan

Over all only 2m2 of floor area lost on upper floors

3. PROPOSAL LAYOUTAND VOLUMES


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- Airtightness 0.6ACH @ 50 PA(n50)-Surface Temperature

> 17degC

-Summer overheating Max 10% > 25degC-Ventilation 30m3/hr.pers-Heating 15kWh/m2yr @20c-Primary Energy 120kWh/m2/yr

ComfortComfortComfortComfortEnergyEnergy

3. PROPOSAL - TARGETS

BECAUSE:FOLLOWTHE PASSIVHAUS STANDARD PRINCIPLES


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3. PROPOSAL - STRATEGY


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3. PROPOSAL - STRATEGY

Fabric First Ventilation Renewables


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il l l ll i i l il

Brick wall as existingNo insulationBreathable wall

il l l ll i i il

Brick wall retrofitted with:150mm internal insulationJoist left in placeCavity un-ventilated

Computer modeling of the Heat transfer effects in thebuilding components

NB: On a PassivHaus Retrofit, about 100 mm of internal insulation should be used,

thicker layers are not recommended, as internal insulation causes lower temperatures in

the wall, diffusion and convection of water vapour should be calculated by a specialist in

advance in order to avoid humidity damages.

3. PROPOSAL JOIST END


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Existing masonry external wall

Continuous air tightness layer

15mm Duraline plasterboard

150mm Insulation quilt

50mm Insulation quilt

metal ferrings holding the insulation

15mm Duraline plasterboard

Thermally contained restraint rodresin anchored into external wall

203x102 PFC chased into partywall

New timber floor joists notched intonew beam. Sizes to be confirmedby Structural Engineer (225x50 tbc)

1No. layers of 15mm duraline

18mm OSB board screwfixed to timber floor joists

Existing masonry external wall

metal ferrings holding the insulation

il l l ll i i l il il l l ll i i l i

l

il l l ll i i l ilAirbrick at top and bottom of

a cavity will help to keep thewall dry



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Steel beam resting in party wall Gap between steel and external wall


Continuous insulation


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3. PROPOSAL AIRTIGHTNESS


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2011 www.pauldavisandpartners.com Air leakage testFabric

3. PROPOSAL - AIRTIGHTNESS


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The ventilation system is a whole houseMechanical Ventilation with HeatRecovery (MVHR)

Easy to use controlsare also essential

Air in-take fitting Air extract fitting

3. PROPOSAL - VENTILATION


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1. Clear the old coal store below the houseand raise the ground floor to allow better

head height2. Lay a new screed, install a waterproof

membrane and allow central drainage to

drain potential condensation 3. Install the concrete fins which form the

labyrinth ducts4. Lay the OSB board airtight layer with 20cm

insulation with foam glass blocks (structural

insulation) that can carry the weight of the

partitions, kitchen units, MVHR, hot water

cylinders5. Lay the floor finish and install the kitchen

units

1 2 3

4 5Insula-onFoamGlass OSBair-ghtlayer

Underground, labyrinthine heat exchanger

3. PROPOSAL - VENTILATION


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Opening casement Internal window reveals

3. PROPOSAL - WINDOWS


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2011 www.pauldavisandpartners.com Before After



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4. COST


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The cost breakdown of the energy saving measures are as follows:

Wallinsula-on:10,892+newsteels:12,785 23,676

Roofinsula-on: 1,554

Windowsanddoors: 32,007 Services: 30,240

87,477

Totalcostofrefurbishment: 178,290(including non energy saving measures)

4. COST


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Energy needed: 21,110kWh/yr Heating: 1,860Appliances: 220 Total /yr: 2,080!Energy demand: 1,700kWh/yr (-92%) Heating: 177 Appliances: 220 Total /yr: 397!

After retrofit

Before retrofit

4. COST


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(Source: House of Commons www.parliament.uk/briefing-papers/SN04153.pdf )

Profile of the UK energy price fluctuation during the last 20 years. The graph shows an increase of gas price of 32% in the last 20 years and 42% just in

the last 5 years (thats an average of 8.4% per year).

+8.4% average increase per year

1990 2009

+ 32% in 20 years+ 42 in the last 5 years

4. COST


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Payback:59 years if the fuel price stagnate36 years with a 5% price increase 17 years with a 10% fuel price

5%

If energy cost increase by 10% per year, in 10 years bills will be:Non-retrofit: 4,824/ yr (100/ week!?)PH Retrofit: 1,030/ yr (21/week)

10%

4. COST PAYBACK TIME


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Decent Homes: !Capital cost: Running costs: Comfort: medium20,000 kWh still?

Existing: !Capital cost: Running costs: Comfort: low20,000 kWh L

PassivHaus: !Capital cost: Running costs: Comfort: high2,000kWh J

4. COST RECAP


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HAPPYPEOPLE


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www.greenoctavia.org.uk

Thank You

2011 marion baeli passivhausuk

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