Project Description. Projected build start date 01 Mar 2010 Projected date of occupation 01 Aug Energy target.

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1 Project name Larch House, Ebbw Vale, Wales Project summary The Larch House, designed by bere:architects, is the UKs first zero carbon (code 6), low cost, Certified Passivhaus, built as prototype social housing and launched at the National Eisteddfod for Wales in 2010.The three bedroom house is 1000ft above sea level in an exposed and misty hilltop location in Ebbw Vale. In spite of this, most energy needs are met by heat from the sun, occupants and appliances and the house generates as much energy from the sun, from solar thermal and photovoltaic panels as well as by glazing, as it uses for the whole year making it Zero Carbon by UK definition and showing how we can live comfortably with minimal impact on the natural world.the house achieved the UK's best air test for a free standing house with... Project Description Projected build start date 01 Mar 2010 Projected date of occupation 01 Aug 2010 Project stage Under construction Project location Ebbw Vale, Blaenau Gwent, Wales Energy target Build type New build Page 1

2 Building sector Public Residential Property type Detached Existing external wall construction Other Existing external wall additional information Timber frame construction Existing party wall construction Floor area 87 m² Floor area calculation method PHPP Building certification Passivhaus certified Project team Organisation Project lead Client Architect Mechanical & electrical consultant(s) Energy consultant(s) Structural engineer Quantity surveyor Other consultant Contractor bere:architects bere:architects United Welsh Housing Association bere:architects Alan Clarke Rob McLeod (BRE) Bob Johnson e-griffin Consulting Pendragon Design strategies Planned occupancy Space heating strategy Water heating strategy Fuel strategy Renewable energy generation strategy Passive solar strategy Space cooling strategy 4-5 people A heat recovery ventilation ensures not only fresh air but also recovers the heat from the extraction. Additionally if needed there are two towel radiators installed in each bathroom. A solar thermal is in place to heat the domestic hot water. There is a gas condensing boiler for back up. Mains gas. Mains electricity 2.52kWp of Photovoltaics are installed. The rear elevation faces South and the large southern elevation to maximise solar gains. Natural cross and stack ventilation will ensure that the Welsh Passivhaus stays cool during the summer time. Page 2

3 Daylighting strategy Ventilation strategy Airtightness strategy Strategy for minimising thermal bridges Modelling strategy Insulation strategy Other relevant retrofit strategies Other information (constraints or opportunities influencing project design or outcomes) The Welsh Passivhaus benefits from large window openings. The house is shallow enough to maximise day-lighting. The kitchen achieves a minimum average daylight factor of at least 2% and the living rooms achieve average daylight factor of at least 1.5% Comfort ventilation with 92% heat recovery (winter)natural ventilation with extract only in the Summer OSB with taped joints and an intello membrane. Passivhaus detailing around windows and other openings. Particular care and supervision of M&E penetrations. Careful detailing and site supervision.preliminary testing to help site identify air leakage routes. Bridge-free construction throughout and all junctions have been modelled in Heat2 and the results fed into the PHPP. Every junction of the building was optimised using a thermal modelling programm and then fed back into the Passivhaus Planning Package. External wall : timber frame with 280mm of mineral wool insulation in between the studs, with a 100mm service void on the inside with wood fibre insulation and a 100mm rigid wood fibre insulation layer on the outside (U-value = W/m2K)Roof: 560mm of mineral wool insulation on top of the first floor ceiling (U-value = W/m2K)Floor slab: 480mm of EPS insulation under the concrete slab (U-value = W/m2K). Energy use Fuel use by type (kwh/yr) Fuel previous forecast measured Electri c 1644 Gas 2662 Oil LPG Wood Page 3

4 Fuel previous forecast measured Primary energy requirement & CO2 emissions Annual CO2 emissions (kg CO2/m².yr) Primary energy requirement (kwh/m².yr) previous forecast measured Renewable energy (kwh/yr) Renewables technology forecast measured Photovoltaics Energy consumed by generation Airtightness ( 50 Pascals ) Date of test Pre-development airtightness - - Final airtightness - - Test result Annual space heat demand ( kwh/m².yr ) Space heat demand Pre-development forecast measured Whole house energy calculation method Other energy calculation method Predicted heating load Other energy target(s) PHPP 10.7 W/m² (demand) Building services Occupancy Space heating Hot water Ventilation Controls Cooking Lighting Appliances Renewables Strategy for minimising thermal bridges Building construction Page 4

5 Storeys Volume Thermal fabric area Roof description Roof U-value Walls description Walls U-value Party walls description Party walls U-value Floor description Floor U-value Glazed doors description Glazed doors U-value Opaque doors description Opaque doors U-value Windows description Windows U-value Windows energy transmittance (G-value) Windows light transmittance Rooflights description Rooflights light transmittance Rooflights U-value Page 5

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