Steijger Solar House
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as PDF Timber framed, super insulated detached dwelling with whole house ventilation and heat recovery. Rainwater harvasting system and P.V. on south facing roof.
Steijger Solar House : 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 | - | 2000 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | 900 kWh/yr | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 54 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 11 kg CO₂/m².yr | - |
| Annual space heat demand | - | 10 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Photo Volataic | 500 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | 500 kWh/yr | - |
| Primary energy requirement offset by renewable generation | 54 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 11 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | OTHER |
|---|---|
| Other whole house calculation method | Lumped parameter calculation, SAP was not able to incorperate all the features of the house |
| Energy target | none was avialble at time of build |
| Other energy targets | - |
| Forecast heating load | 100 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Occupied |
|---|---|
| Start date | 17 July 2001 |
| Occupation date | 30 March 2002 |
| Location | South Normanton Derbyshire England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Softwood frame |
| Other construction type | red cedar cladding |
| Party wall construction | |
| Floor area | 110 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | Silvercrest Energy and Automation |
|---|---|
| Project lead person | Claremont Construction, Cromford |
| Landlord or Client | Mr. L. Steijger |
| Architect | A. Newton, Idridgehay |
| Mechanical & electrical consultant | |
| Energy consultant | Silvercrest Energy and Automation |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | Two adults, mostly working from home. |
|---|---|
| Space heating strategy | Solid bio-fuel stove, due to super insulation and air circulation little other heating is required. |
| Water heating strategy | Air source heat pump, extracting heat from excess in the dwelling. |
| Fuel strategy | Mains electricity, bio-fueled stove |
| Renewable energy strategy | 1 kWp. photovoltaics on south facing roof. |
| Passive Solar strategy | Large due south facing conservatory with overhanging roof provided heating in the winter whilst preventing overheating in the summer. |
| Space cooling strategy | Due to incorperating all factors into the design, not required. One of the standard features of MVHR now is to bypass the heat recovery during warm periods. |
| Daylighting strategy | Strategically placed windows on east and west provide sufficient daylight most whole year round, whilst preventing too much solar gain in summer. |
| Ventilation strategy | Mechanical ventilation with heat recovery in winter, summer bypass and opening windows in case of extreme heat. |
| Airtightness strategy | Blown in insulation material ensured that all possible gabs are filled. Foam filling between window ledges and windows ensured air tightness at these points. |
| Strategy for minimising thermal bridges | Use of masonite beams reduced the thermal (wooden) bridges between inner and outer leaf. |
| Modelling strategy | Lumped parameter modeling, later design confirmed with modelling package TRNSys |
| Insulation strategy | Blown in woodfibre (Warmcell) ensured an insulation value below 0.13 W/m2'C |
| Other relevant retrofit strategies | |
| Contextual information |
Building services
| Occupancy | 2 people, mostly working from home |
|---|---|
| Space heating | Central 9 kW woodstove |
| Hot water | WWK 300 heat pump Stieble Eltron |
| Ventilation | ITHO MVHR |
| Controls | Not required |
| Cooking | Induction hob |
| Lighting | Mainly low energy, Halogen in living area |
| Appliances | All appliances A or better rated, apart from condensing dryer. However, the heat is transferred in to the house and not lost as such. |
| Renewable energy generation system | 1.02 kWp PV |
| Strategy for minimising thermal bridges | Masonite beams in external walls |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 374m³ |
| Thermal fabric area | - |
| Roof description | Pitched at 40 degrees for optimal solar collection |
| Roof U-value | 0.13 W/m² K |
| Walls description | Timber frames, mesonite wall |
| Walls U-value | 0.13 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | floating concrete floorslab with expanded polystyreen insulation. |
| Floor U-value | 0.15 W/m² K |
| Glazed doors description | Timber doors with either double glazed or timber plate. |
| Glazed doors U-value | 3.00 W/m² K installed |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | Turn and tilled double glased units. All windows have a close fitting thermal lined curtain. The U-value is estimated at 3 W/m2'C with the curtains open and 1.2 with the curtains closed. |
| Windows U-value | 1.20 W/m² K - |
| Windows energy transmittance (G-value) | - |
| Windows light transmittance | 80% |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |