Measured data from renewable generation is not yet available.
Pre-development | Forecast | Measured | |
Electricity use | - | 6097 kWh/yr | - |
---|---|---|---|
Natural gas use | - | - | - |
Oil use | - | - | - |
LPG use | - | - | - |
Wood use | - | - | - |
Other Fuel | - | - | - |
Pre-development | Forecast | Measured | |
Primary energy requirement | - | 147 kWh/m².yr | - |
---|---|---|---|
Annual CO₂ emissions | - | 35 kg CO₂/m².yr | - |
Annual space heat demand | - | 20 kWh/m².yr | - |
Electricity generation | Forecast | Measured |
---|---|---|
Renewables Technology | - | - |
Other Renewables Tech | - | - |
Electricity consumed by generation | - | - |
Primary energy requirement offset by renewable generation | 147 kWh/m².yr | - |
Annual CO₂ emissions offset by renewable generation | 35 kg CO₂/m².yr | - |
Whole house energy calculation method | |
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Other whole house calculation method | - |
Energy target | Near Passivhaus |
Other energy targets | - |
Forecast heating load | 16 W/m² demand |
Date | Result | |
Pre-development air permeability test | 03 March 2008 | - |
---|---|---|
Final air permeability test | 02 June 2008 | 1.94m³/m².hr @ 50 Pascals |
Stage | Occupied |
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Start date | 15 August 2008 |
Occupation date | |
Location | York North Yorkshire England |
Build type | New build |
Building sector | Public Residential |
Property type | |
Construction type | |
Other construction type | |
Party wall construction | |
Floor area | 104 m² |
Floor area calculation method | Actual Floor Area (SAP) |
Building certification |
Organisation | |
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Project lead person | |
Landlord or Client | York Housing Association |
Architect | Phil Bixby of Constructive Individuals |
Mechanical & electrical consultant | Nu-Aire |
Energy consultant | |
Structural engineer | Thermal Timber Frame |
Quantity surveyor | Brian Stace |
Consultant | |
Contractor | Transcore |
Planned occupancy | All dwellings were planned as 3 bedroom units. |
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Space heating strategy | The main space heating strategy was to design out central heating systems by providing high levels of insulation (all opaque fabric U-vales less than 0.12 W/m2K) and setting ambitious air permeability targets. Electric resistance heating and positive input ventilation air with pre-heated air combine to provide back-up space heating. |
Water heating strategy | Flat panel solar hot water panels to meet up to 60% of the solar hot water demand and electric immersion to provide back-up. |
Fuel strategy | The sole fuel source is mains electricity. |
Renewable energy strategy | No renewable energy generation was proposed. |
Passive Solar strategy | Principles of passive solar design were followed: Larger areas of glazing are provided to the southern facing elevations with minimal glazing to the rear of the dwelling. |
Space cooling strategy | Main cooling is primarily through natural ventilation. Mechanically driven cooling using night-time positive input ventilation is also an option. |
Daylighting strategy | The passive solar design assists in providing daylight to the living and some bedroom spaces. Rooflights are used to provide natural light to the first floor bathroom and second bedroom. |
Ventilation strategy | Positive input ventilation to supply fresh air, with pre-heating provided by passing outside air through solar hot water panel. |
Airtightness strategy | The primary airtightness barrier is a continuous internal barrier composed as follows: Roof = Panels sized to minimise number of construction joints and panels covered with DuPont Airgurad membrane, lapped and taped to wall membrane. Wall = Continuation of internal membrane on OSB, taped and sealed to all openings and penetrations and down to floor slab. Battened service voids provided internally to protect integrity of air barrier. |
Strategy for minimising thermal bridges | The construction detailing was developed over a series of two similar, super-insulated timber frame schemes and informed by and developed with input from the contractor. |
Modelling strategy | |
Insulation strategy | |
Other relevant retrofit strategies | |
Contextual information |
Occupancy | Varies - From 2 to 4 occupants. |
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Space heating | 2 kW electric panel heater with additional contribution from a NuAire'Sunwarm' positive input ventilation system. |
Hot water | 2 No. 1.25 x 2.5 solar hot water flat panels from NuAire with backup electric immersion heater. |
Ventilation | NuAire'Sunwarm' positive input ventilation system with a single suppy air diffuser. This unit passes incoming air thorough the solar hot water panels to pre-heat supply air and can reverse this operation during warm nights to provide some cooling. A separate hood extract is provided in the ktichen. |
Controls | The NuAire 'Sunwarm' system is controlled by a single user control panel with one adjustable dial to choose from six supply air speed settings. The single electric panel heater is controlled by a room thermostat and timer. |
Cooking | All cooking appliances supplied by tenants. |
Lighting | 100% compact fluorescent bulbs throughout. |
Appliances | All appliances supplied by tenants. The one exception to this is that the housing association requires all tumble dryers to be condensing models to avoid the need to puncture the air membrane for a dryer vent. |
Renewable energy generation system | None. |
Strategy for minimising thermal bridges | None calculated. |
Storeys | 3 |
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Volume | 253m³ |
Thermal fabric area | 187 m² |
Roof description | Double pitched roof finished in plain clay pantiles on a 407mm deep, fully insulated engineered timber joist/rafter OSB clad panel. Prefabricated roof panels span from the wallplate to a ridge beam. An internal service void has been created using 25x50 battens with the ceiling finished with 12mm plasterboard. |
Roof U-value | 0.08 W/m² K |
Walls description | Two types of external cladding: Stained softwood vertical board on board cladding to ground floor; Thermowood horizontal boarding above. The cladding boards fixed to 25 x 50mm battens on OSB sheathing on 300mm engineered timber studs lined internall with OSB and fully filled with mineral wool. An internal service void is provided by fixing plasterboard on 25 x 50 battens. |
Walls U-value | 0.10 W/m² K |
Party walls description | Timber cavity comprised of the following construction on either side of a 50mm cavity: 12mm plasterboard on 18mm timber boarding on 89mm timber frame. Only one of the two halves of the party wall construction is insulated with mineral fibre. |
Party walls U-value | - |
Floor description | Floating floor construction comprised of 22mm tongue and groove timber boards with all edges glued on two layers of 75mm extruded polystyrene insulation on 100mm concrete slab on ground. |
Floor U-value | 0.12 W/m² K |
Glazed doors description | Solid stained softwood doors with double glazing. |
Glazed doors U-value | 2.00 W/m² K uninstalled |
Opaque doors description | |
Opaque doors U-value | - - |
Windows description | Double glazed timber windows with low emissivity coating, 16mm argon fill. |
Windows U-value | 1.70 W/m² K uninstalled |
Windows energy transmittance (G-value) | 60 % |
Windows light transmittance | 70% |
Rooflights description | Fakro triple glazed rooflights in laminated timber frame. |
Rooflights light transmittance | 50% |
Rooflights U-value | 1.70 W/m² K |