Pre-development | Forecast | Measured | |
Electricity use | - | 2058 kWh/yr | - |
---|---|---|---|
Natural gas use | - | 3034 kWh/yr | - |
Oil use | - | - | - |
LPG use | - | - | - |
Wood use | - | - | - |
Other Fuel | - | - | - |
Pre-development | Forecast | Measured | |
Primary energy requirement | - | 83 kWh/m².yr | - |
---|---|---|---|
Annual CO₂ emissions | - | 18 kg CO₂/m².yr | - |
Annual space heat demand | - | 15 kWh/m².yr | - |
Electricity generation | Forecast | Measured |
---|---|---|
Renewables Technology | - | - |
Other Renewables Tech | - | - |
Electricity consumed by generation | - | - |
Primary energy requirement offset by renewable generation | 83 kWh/m².yr | - |
Annual CO₂ emissions offset by renewable generation | 18 kg CO₂/m².yr | - |
Whole house energy calculation method | PHPP |
---|---|
Other whole house calculation method | - |
Energy target | |
Other energy targets | - |
Forecast heating load | 10 W/m² demand |
Date | Result | |
Pre-development air permeability test | 14 January 2010 | 0.41m³/m².hr @ 50 Pascals |
---|---|---|
Final air permeability test | 11 March 2010 | 0.34m³/m².hr @ 50 Pascals |
Stage | Occupied |
---|---|
Start date | 15 May 2009 |
Occupation date | 06 June 2010 |
Location | Denby Dale West Yorkshire |
Build type | New build |
Building sector | Private Residential |
Property type | Detached |
Construction type | Masonry Cavity |
Other construction type | 300mm cavity |
Party wall construction | |
Floor area | 104 m² |
Floor area calculation method | Treated Floor Area (PHPP) |
Building certification | ![]() |
Organisation | Green Building Store |
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Project lead person | Bill Butcher & Chris Herring, Green Building Store |
Landlord or Client | Geoff & Kate Tunstall |
Architect | Derrie O'Sullivan |
Mechanical & electrical consultant | |
Energy consultant | Pete Warm, WARM low energy building practice |
Structural engineer | |
Quantity surveyor | |
Consultant | |
Contractor | Green Building Company |
Planned occupancy | |
---|---|
Space heating strategy | Heating from mains gas fired boiler. Space heating need was calculated as 1.18 kW (at - 10 degrees celcius) .Total heating need (including water heating) was 3kW but the smallest gas boiler we could find was 4.8 kW. To create adequate capacity for the boiler (in terms of water volume etc) we installed 1 radiator, 2 towel rails and a duct heater for MVHR system. |
Water heating strategy | Heating from mains gas fired condensing boiler. Grant-funded solar thermal panels added later by clients. |
Fuel strategy | Mains gas, Mains electricity |
Renewable energy strategy | None in original build and budget - preferring to concentrate funds on the Passivhaus measures and building fabric itself.However, the clients have subsequently installed grant-assisted solar thermal and solar PV panels on their roof. |
Passive Solar strategy | South elevation. Window proportions optimised using PHPP. Clients wanted a large solar space - as part of the house which was modelled in PHPP to avoid over-heating. |
Space cooling strategy | Daytime use of MVHR with night purging during heat waves.Measures to provide summer shading include:Large roof overhang, external venetian blinds, proposed deciduous vine on a pergola. |
Daylighting strategy | |
Ventilation strategy | Comfort ventilation with heat recovery (winter)Openable windows (summer) |
Airtightness strategy | Wet plaster coating to interior walls.Concrete floor slab is carried across the top of the blockwork of the inner leaf of the wall to minimize shrinkage cracking between the wall and the floorAttention to airtightness detail around window and door openings and junctions between floors, walls and roofs, including use of airtightness membranes and tapes. To improve airtightness around the window opening, a plywood box was set into the wall. An adhesive-backed airtightness tape was then attached to the plywood with a fleece wrapped into the wet plaster, making the junction between the plywood and plaster airtight. Another airtightness tape was used to seal the gap between the window and the plywood box.Various details at first floor junction to avoid penetration of the inner leaf blockwork including: use of timber wall plate; parging of the blockwork behind the wall plate; use of-anchored stainless steel threaded bar to carry the 302mm timber I-beam structure. Use of I-B... |
Strategy for minimising thermal bridges | Use of 300mm insulation in the cavity going right down to the strip foundation, so that any heat lost from the concrete floor slab will have a longer thermal transfer path. Use of lightweight aerated block below ground level, which does not transfer heat as readily as standard concrete block.Use of basalt and resin cavity wall ties (instead of the usual steel ties).Positioning of windows and doors at the centre line of the insulation layer. |
Modelling strategy | Whole house modelling was undertaken in PHPP. |
Insulation strategy | Walls: 300mm fibreglass batts Under groundfloor: 225mm polyfoam insulationRoof void: 500mm fibreglass quiltWindows and doors: triple glazing with insulated thermal break in frame. |
Other relevant retrofit strategies | |
Contextual information |
Occupancy | |
---|---|
Space heating | Vaillant Eco-Tec 612 (4.8kW) |
Hot water | |
Ventilation | PAUL Thermos 200 MVHR unit. SAPQ and Passivhaus Instiut certified.92% efficiency. |
Controls | |
Cooking | Gas with recirculating cooker hood. |
Lighting | Low energy LED lighting system in most areas. |
Appliances | |
Renewable energy generation system | |
Strategy for minimising thermal bridges | Psi values have been calculated for internal and external values. External psi-value have been entered into PHPP. |
Storeys | 2 |
---|---|
Volume | - |
Thermal fabric area | - |
Roof description | PlasterboardMineral wool |
Roof U-value | 0.10 W/m² K |
Walls description | Gypsum plasterDense concrete blockCavity fill mineral woolSandstone |
Walls U-value | 0.11 W/m² K |
Party walls description | |
Party walls U-value | - |
Floor description | ScreedKnauf polyfoam |
Floor U-value | 0.10 W/m² K |
Glazed doors description | Ecopassiv triple glazed FSC 100% timber windows |
Glazed doors U-value | 0.80 W/m² K installed |
Opaque doors description | |
Opaque doors U-value | - - |
Windows description | Ecopassiv triple glazed FSC 100% timber windows |
Windows U-value | 0.80 W/m² K - |
Windows energy transmittance (G-value) | 52.9 % |
Windows light transmittance | 70.9% |
Rooflights description | |
Rooflights light transmittance | - |
Rooflights U-value | - |