Orchard Field, Plot 17 (21 Severells Drive)
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as PDF Part of a development of 88 new-build dwellings to the AECB Building Standard.
Orchard Field, Plot 17 (21 Severells Drive) : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | 5768 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 82 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 19 kg CO₂/m².yr | - |
| Annual space heat demand | - | 23 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Solar PV | 3478 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 32 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 7 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | AECB Silver |
| Other energy targets | - |
| Forecast heating load | 13 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 14 November 2022 | 1.02m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 05 April 2021 |
| Occupation date | 14 November 2022 |
| Location | Siddington Gloucestershire England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | |
| Other construction type | |
| Party wall construction | |
| Floor area | 175 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  AECB silver standard certified building |
Project Team
| Organisation | Stonewood Homes |
|---|---|
| Project lead person | Stonewood Homes |
| Landlord or Client | Stonewood Homes |
| Architect | Stonewood Design |
| Mechanical & electrical consultant | Greengauge Building Energy Consultants |
| Energy consultant | Greengauge Building Energy Consultants |
| Structural engineer | JDL Consultants |
| Quantity surveyor | Stonewood Homes |
| Consultant | |
| Contractor | Stonewood Homes |
Design strategies
| Planned occupancy | Up to 7 person occupancy (4 bedrooms). |
|---|---|
| Space heating strategy | Air source heat pump with underfloor heating and radiators. |
| Water heating strategy | Air source heat pump with cylinder. |
| Fuel strategy | Mains electricity |
| Renewable energy strategy | Solar PV |
| Passive Solar strategy | Windows and solar gain designed to balance useful winter solar against summer overheating using PHPP. |
| Space cooling strategy | Natural ventilation |
| Daylighting strategy | Balanced window layout. |
| Ventilation strategy | Mechanical ventilation with heat recovery with additional ventilation through windows. |
| Airtightness strategy | Floor - screed. Walls - OSB. Roof - airtight membrane. Tape between junctions and joints. |
| Strategy for minimising thermal bridges | Continuous insulation around junctions.Ground floor uses low conductivity block. Windows use internal reveal insulation.Psi values calculated for floor-wall (ground floor and intermediate floor) and window junctions. |
| Modelling strategy | Whole building modelling undertaken in PHPP. |
| Insulation strategy | Floor insulation above slab to achieve 0.10 W/m2K. Insulation timber frame system to achieve 0.16 W/m2K. Insulation joists to achieve 0.09 W/m2K. |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | Up to 7 person occupancy (4 bedrooms). |
|---|---|
| Space heating | Daikin heat pump |
| Hot water | From heat pump with cylinder |
| Ventilation | Lindab MVHR |
| Controls | Programmable room thermostat and TRVs |
| Cooking | Electric |
| Lighting | LEDs |
| Appliances | Electric |
| Renewable energy generation system | Solar PV with panels from JA solar |
| Strategy for minimising thermal bridges | Continuous insulation around junctions.Ground floor uses low conductivity block (Thermalite Aircrete Hi-Strength 7). Windows use internal reveal insulation.Psi values calculated for floor-wall (ground floor and intermediate floor) and window junctions. |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 437m³ |
| Thermal fabric area | 505 m² |
| Roof description | 520 mm mineral wool between and above joists |
| Roof U-value | 0.09 W/m² K |
| Walls description | Sigma II wall panel with 235 mm Knauf Supafil insulation |
| Walls U-value | 0.16 W/m² K |
| Party walls description | Mineral wool between timber frame. |
| Party walls U-value | 0.00 W/m² K |
| Floor description | 200 mm Xtratherm Thin-R Plus Hyfloor |
| Floor U-value | 0.10 W/m² K |
| Glazed doors description | Solarlux bifold doors |
| Glazed doors U-value | 0.90 W/m² K uninstalled |
| Opaque doors description | Rationel AURAPLUS |
| Opaque doors U-value | 0.80 W/m² K uninstalled |
| Windows description | Rationel AURAPLUS |
| Windows U-value | 0.80 W/m² K uninstalled |
| Windows energy transmittance (G-value) | 53 % |
| Windows light transmittance | 73% |
| Rooflights description | Keylite Triple Glazed |
| Rooflights light transmittance | 55% |
| Rooflights U-value | 1.00 W/m² K |