2011 Dan Gibbon Enerphit Retrofit Talk

7/27/2019 2011 Dan Gibbon Enerphit Retrofit Talk

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bere:architects

UK Passivhaus Conerence

October 2011

Aiming or the Passivhaus/EnerPHit standard inoccupied buildings

Dan Gibbons, bere:architects

www.bere.co.uk

[email protected]


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Retrot or the Future

The RF programme was split into two phases, Phase 1 saw 194 design and easibility studies

developed, while Phase 2 took 86 o these studies and unded the implementation o the retroftproposals

Each o the projects will see innovative plans put in place or low carbon refts o existing low-risesocial housing that will meet the UK governments target or reducing greenhouse gas emissionso 80% by 2050, while also cutting energy use dramatically.

Programme applicants were asked to develop whole house retroft solutions that would result indeep cuts to CO

2emissions whilst also signifcantly improving energy perormance. Applicants

were required to take a whole house approach, i.e. to consider a households energy needsand carbon dioxide impacts as a whole, and establish a comprehensive package o measures toreduce them.

(http://www.retroftortheuture.org)


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Existing Buildings

3 Passeld Drive 78 Grove Road

Terraced house

No lot insulation

Solid wall construction

Single-glazed metal-ramed

windows

Lean-to extension

Concrete ground slab

(Semi) detached house

No lot insulation

Solid wall construction

Poorly tted double-glazedwindows

Suspended timber ground

foor

Bay window in poor repair


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3 Passeld Drive beore the Retrot works (rear extension)

Passeld Drive

3 Passeld Drive beore the Retrot works

Existing Buildings


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bere:architects Passeld Drive

The proposed Retrot works as shown on the original competition entry

Initial Proposals


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Initial Proposals


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bere:architects Grove Road

The proposed Retrot works as shown on theoriginal competition entry

Initial Proposals


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Initial Proposals


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A Passivhaus Planning Package (PHPP) assessment o the energy

requirements o the existing house

A PHPP assessment o the proposed Retrot works as shown on the

original competition entry

3 Passfield drive3 Passfield drive

Passeld Drive

Initial Proposals


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Passive House Verification

Photo or Drawing

Building: TSB retrofit for the future property proposed work

Location and Climate: Hounslow, London GB-London

Street: 78 Grove Road

Postcode/City: TW3 3PT London

Country: United Kingdom

Building Type: Detached house

Home Owner(s) / Client(s): Hounslow Council

Street: Lampton Road

Postcode/City: TW3 4DN Hounslow

Architect: bere:architects

Street: 73 Poets Road

Postcode/City: N5 2SH

Mechanical System: Alan Clarke T

Street: The Woodlands, Woodland Close, Whitecroft

Postcode/City: GL15 4PL Lydney

Year of Construction: 1950's

Number of Dwelling Units: 1 Interior T emperature: 21.0 C T

Enclosed Volume Ve: 353.1 m3 Internal Heat Gains: 2.1 W/m2

Number of Occupants: 2.7

Specific Demands with Reference to the Treated Floor Area

Treated Floor Area: 84.2 m2

Applied: Monthly Method PH C ertificate: Fulfilled? Verification:

Specific Space Heat Demand: 26 kWh/(m2a) 15 kWh/(m2a) No

Pressurization Test Result: 0.6 h-1 0.6 h-1 Yes

Specific Primary Energy Demand

(DHW, Heating, Cooling, Auxiliary and Household Electricity):94 kWh/(m2a) 120 kWh/(m2a) Yes

Specific PrimaryEnergyDemand

(DHW, Heating and AuxiliaryElectricity):53 kWh/(m2a)

Specific PrimaryEnergyDemand

EnergyConservation bySolar Electricity: kWh/(m2a)

Heating Load: W/m2

Frequencyof Overheating: 8 % over 25 C

Specific Useful Cooling EnergyDemand: kWh/(m2a) 15 kWh/(m

2a)

Cooling Load: W/m2

A Passivhaus Planning Package (PHPP) assessment o the energy

requirements o the existing house

A PHPP assessment o the proposed Retrot works as shown on the

original competition entry

78 Grove road 78 Grove road

Grove Road

Initial Proposals


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78 Grove Road beore the Retrot works

78 Grove Road beore the Retrot works

Existing Buildings


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Architect: Schulze Darup & Partner

Location: Bernadottestrae, Nrnberg

Year o rst construction: 1964

Year o retrot: 2006

Heated foor area: 918m2

Number o residences: 24 > 31

images: Dr. Burkhard Schulze Darup schulze darup & partner architekten nrnberg

Precedent Study


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Retrot:

Walls: 200-240mm external insulation = 0.16-0.14 W/(mK)

Roo Terrace: 200mm external insulation = 0.18 W/(mK)

Ceilings: 120-240mm = 0.16-0.22 0.18 W/(mK)

Windows: triple glazing = 0.92 W/(mK)

Heat Recovery Ventilation = 85% Eciency

District heating system

Precedent Study


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Retrot:

Walls: 200-240mm external insulation = 0.16-0.14 W/(mK)

Roo Terrace: 200mm external insulation = 0.18 W/(mK)

Ceilings: 120-240mm = 0.16-0.22 0.18 W/(mK)

Windows: triple glazing = 0.92 W/(mK)

Heat Recovery Ventilation = 85% Eciency

District heating system

New Build Lot Apartments:

6 new Passivhaus certied apartments 70-110m

Precedent Study

204 26 15

heating demand

kWh/(my)

Beore Ater Lots


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Retrot Works



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Passivhaus Windows and Doors


Windows and doors achieve

0.8 W/(m2K)

Timber rames position

windows and doors within

line o insulation

Frames provide tolerance

to allow early ordering o

windows

Existing windows remain in

place longer


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Airtight membranes provide continuity

between the window sealing tapes and

the parge coat o the external walls

The window sealing tapes are continuous

with rabbit ears at the corners to

acilitate sealing and allow or dierential

movement

The rabbit ears are olded back so that

they can be sealed to the membranes



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membranes and tapes

provide continuous seal to

parge coat


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External Insulation


240mm EPS insulation to

ront and rear walls. (180mm

extended one meter below

ground creating thermal

bubble beneath building)

Average U-values:

pre-retrot = 1.76 W/(m2K)

post retrot = 0.117W/(m2K)


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External Insulation


200mm and 250mmm EPS

insulation to ront and

rear walls. (180mm extended

one meter belowground creating thermal

bubble beneath house)

Average U-values:

pre-retrot = 1.76 W/(m2K)

post retrot = 0.13 W/(m2K)


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New Construction


New extension insulated

with 375mm wood bre

insulation to walls and

225mm mineral wool and

150mm wood bre

insulation to roo.


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New Construction


New bay window

construction insulated

with 375mm wood bre

insulation to walls and

225mm mineral wool.


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Floor Insulation


150mm Mineral wool

suspended between

timber joists on geo-textile

membrane


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Geo-textile membranes were laid across the foor joists to

support mineral wool insulation. OSB boards are laid over

the foor and taped to the walls to provide an airtightness

barrier. This work was also carried out on a room by room

basis

Original proposals assumed that the suspended timber foor could be

replaced with a similar insulated slab requiring a decant o the tenants

Floor Insulation


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Floor Insulation


10mm thick Vacuum

Insulation panels protected

by 4mm sheets o EPS

sheets


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Original proposals assumed that the ground foor slab could be replaced

with a new insulated slab requiring a decant o the tenants

Preabricated vacuum insulation panels were tted above

the existing concrete ground foor slab; protected with oam

sheets. The insulation could be installed one room at a time

Floor Insulation


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Roo Insulation


490mm mineral wool

insulation to attic space


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Roo Insulation


100mm mineral wool and

300mm cellulose insulation

to attic space

U value = 0.10 W/(m2K)

PUR insulation at eaves

provides continuity oinsulation rom attic space

to walls


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Eaves were extended to allow continuity o insulation rom

the lot to the walls without removing the entire roo

Original proposals assumed that the existing roo tiles could be replaced

allowing insulation to be installed between and above the raters.

Hounslow Homes wanted to avoid the requirement or a temporary roo

and requested an alternative solution.

Roo Insulation


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Heat Recovery Ventilation


Paul Novus 300 Heat

Recovery Ventilation units

located in lot spaces

provide continuous hygienic

ventilation

Tilt and turn windowsprovide secure natural

ventilation in summer


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Heat Recovery Ventilation


Duct routes ollow chimney

breasts and existing storage

spaces to minimise intrusion

into living spaces


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Solar Thermal


Grove Road:

3 no. AuroTHERM exclusive

VTK570/2 tube collectors

with new Vaillant solar

cylinder and boiler.

Passeld Drive:

2 no. AuroTHERM plus VFK150V collectors with Vaillant

cylinder and reconditioned

Vaillant boiler.


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Other Measures


Breathable internalinsulation on party walls

Low fow taps and dual fush

WC throughout

High perormance insulation

(0.038 W/m2K at 40C)

to hot water pipes.

All timber products were

either FSC or PEFC.

Water butt and outside tap

provided to assist residents

commitment to their garden

Additional kitchen and

bathroom upgrades carried

out by RSLs during retrotworks to minimise later

disruptions


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Air Tightness


Continuous membraneinstalled in attic sealed to

parge coat on walls.

Continuous seal rom parge

coat to airtightness

membranes in extension.

Windows sealed to parge

coat with continuous

tapes.

Airtightness grommets tted

to all service

penetrations.

Passeld Drive:

Improved airtightness rom

5.6 ach - 1.9 ach at 50Pa

Grove Road:

Improved airtightness rom

6.3 ach - 1.7 ach at 50Pa

(as veried by ALDAS and BSRIA)


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A continuous membrane installed in the lot at Passeld Drive to create the

airtightness barrier, sealed to the external walls.

The membrane proved dicult to install; requiring many taped joints and

dicult sealing details around service penetrations

Air Tightness


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The boards allowed access to be maintained in the roo space and simple

seals to be used around services

18mm OSB provides the airtight barrier. Membranes are used to seal

around roo timbers and connect to the external walls

Grove Road

Air Tightness


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Air Tightness: potential losses


air inltration through

interstitial foors suggested

party walls may be source

o some air losses


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Air Tightness: potential losses


additional losses through

discontinuity o air tightness

layer at oundation level


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bere:architects Handover

These vents remove possiblestale and damp air rom thekitchen, bathroom and WC.The heat recovery unit savesheat, which saves money. Theventilation runs continuously all

year round but specialmotors have tinyenergy consumption.The extract air ventlter in the kitchenneeds to be cleanedabout every 3 monthsdepending on use.

Passeld DriveUser Guide

bere:architects

This unit saves heatrom the internal airproduced by solargains, people andelectric items to pre-heat a supply o reshair. I air heating is notrequired only reshltered air is supplied.These lters need to bereplaced every 6months

in London. The system saves about 10 times moreenergy than it uses! It is located in the store in aninsulated cupboard.

The resh airsystem can belet on autobut the anspeed can also

be manuallychangedusing thispanel duringcooking or i thebathrooms are

steamy. I you go away or a period o time dont turnit o but leave it on the lowest speed.

This unit stores hot water produced bythe panel (8) on your roo and or theheating and added water heated by thegas boiler (7). The tank is well insulatedmeaning there is hot water day and

night. The temperate o the tank isset with the control panel below. Thespace heating is controlled with the

Thermostat inthe entranceway (5) andnot via thispanel.

In summeralmost all thewater in thesolar tank isheated by the

sun shiningon the solarpanel on theroo. In winter

the panel can heat the bottom hal o the tank andthe boiler is used to top up the temperature. Thismeans there is always hot water available in the tankeven on a cloudy day.

To keep the internaltemperature cool in thesummer utilise the coolernight temperatures byleaving the windows

open in the secure tiltposition overnight. Iits hotter outside inthe day you can shut

the windows then turn the heat recovery ventilationto summer by pass using the user settings on thecontrol panel (4) to keep cool inside. Please reer tothe heat recovery ventilation unit manual surplied byAD enviro.

This house has beenwrapped in insulation, foorwalls and roo. The ront wallhas 200mm, rear 250mm,the roo 490mm andvacuum insulation on thefoors. Every penetrationso this insulation has beensealed to produce a dratree building suitable orusing a heat recovery unit.These improvement willmake your energy cost muchlower.

Alan Clarke (Building Services Engineer)Tel: 01594 563356E-mail: [email protected]

bere:architects (passivhaus specialists)Tel: 020 7359 4503E-mail: [email protected]

The thermostatin the entranceway sets thetemperatureor your house.20-21C isthe normaltemperature,but you couldturn it down i

you are away or a ew days or just or a ew hours tosave energy. To adjust the room temperature, locatethe room temperature display and simple rotate theright knob up or down.

This boiler serves asback up or the solartank (6). I there has notbeen enough sun thewater in the solar tankmay not be hot enoughor heating or showering.In this instance the gasboiler will top up the solartank. There is no needto amended the settingon the boiler. To turnthe heating up use thethermostat (5).

The resh air (pre-warmedin winter) is supplied bythe heat recovery unitand delivered to thebedrooms and living

room using these resh airvents. The heating system(6,7) is automatic but youcan adjust the an speed(4) manually with the wall

mounted panel in the kitchen. This will keep the airresh during a amily gathering or intensive cooking(in addition to the extractor an.

1 Heat recovery ventilation unit

4 Heat recovery ventilation control panel 6 Solar tank and control panel

7 Bo iler and cont rol pane l 9 Insulation and dra t ree cons truc tion

8 Hot water rom the sun 10 Windows (or summer cooling)

5 Thermostat

Passeld drive north elevation

2 Fresh air vents

3 Extract air vents

The term passivhaus reers to an advanced lowenergy construction standard or buildings, whichhave excellent comort conditions in both winter andsummer. They typically achieve a heating saving o 90%compared to existing housing. Passivhaus buildings areeasy to live in and require little maintenance, but theydo have some important eatures, which are explainedin this guide. The eatures are simple to operate, but aull understanding will help you get the lowest energy

consumption and best comort. This guide has beendesign by Alan Clarke and bere:architects or you (theuser) to understand how a passivhaus works and how tooperate the controls in this house.Each eature is labelled on the drawings below,highlighting their locations and briefy explaining how tooperate them in the corresponding text. Please take thetime to read this guide and amiliarise yoursel with thecontrols.

This house is built towards a buildingstandard called Passivhaus.

AD enviro (passeld drive building contractor)Consult the specic manuactures guides supplied

For urther inormation regarding these eatures:

Ground foor plan First foor plan Second foor plan Section AA

Supply ducts

Extract ducts

Insulation

Wall construction

Outside air intake

KitchenEntrance

Dining area

Sitting area

Sitting area

Bedroom

Radiator

Bedroom

Bathroom

Bedroom

Roo space

BedroomLiving room

Living room

Garden

WC

WC

18

9

9

9

37

10

10

10

10

3

4

5

63

3

2

2

2 2

2

2

2

2


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Photo or Drawing


Location and Climate: Hounslow, London GB-London

Street: 78 Grove Road

Postcode/City: TW3 3PT London


Building Type: Detached house

Home Owner(s) / Client(s): Hounslow Council

Street: Lampton Road

Postcode/City: TW3 4DN Hounslow



Postcode/City: N5 2SH

Mechanical System: Alan Clarke

Street: The Woodlands, Woodland Close, Whitecroft

Postcode/City: GL15 4PL Lydney


Number of Dwelling Units: 1 Interior Temperature: 20.0 C





Applied: Monthly Method PH Certificate: Fulfilled?


Pressurization Test Result: 1.7 h-1 0.6 h-1 No


(DHW,Heating, Cooling,Auxiliary and Household Electricity):97 kWh/(m2a) 120 kWh/(m2a) Yes


(DHW,Heating and Auxiliary Electricity):56 kWh/(m

2a)


Energy Conservation by Solar Electricity:kWh/(m

2a)

Heating Load: W/m2

Frequency of Overheating: 15 % over 25 C

Specific Useful Cooling Energy Demand: kWh/(m2a) 15 kWh/(m

2a)

Cooling Load: W/m2

We confirm that the values given herein have been Issued on:

determined following the PHPP methodology and based

on the characteristic values of the building. The calculations signed:

with PHPP are attached to this application.


Photo or Drawing


Location and Climate: London GB-London

Street: 3 Passfield Drive

Postcode/City: E14 6QJ London


Building Type: Terraced house

Home Owner(s) / Client(s): Southern Housing

Street: P0 Box 643

Postcode/City: West Sussex RH12 1XJ



Postcode/City: N5 2SH London

Mechanical System:

Street:

Postcode/City:


Number of Dwelling Units: 1 Interior Temperature: 20.0 C





Applied: Annual Method PH Certificate: Fulfilled?


Pressurization Test Result: 1.9 h-1 0.6 h-1 No


(DHW, Heating, Cooling, Auxiliary and Household Electricity): 119 kWh/(m2a) 120 kWh/(m

2a) Yes


(DHW, Heating and Auxiliary Electricity):58 kWh/(m

2a)


Energy Conservation by Solar Electricity: kWh/(m2a)

Heating Load: W/m2

Frequency of Overheating: 0 % over 25 C

Specific Useful Cooling Energy Demand: kWh/(m2a) 15 kWh/(m

2a)

Cooling Load: W/m2

We confirm that the values given herein have been Issued on:determined following the PHPP methodology and based

on the characteristic values of the building. The calculations signed:

with PHPP are attached to this application.

Predicted specic heat demand reduction o 91%

78 Grove road3 Passfield drive

Predicted specic heat demand reduction o 94%

Results


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Results


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Results


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Results


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Results


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thank you

Dan Gibbons, bere:architects

www.bere.co.uk

[email protected]

2011 Dan Gibbon Enerphit Retrofit Talk

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