The Greenhouse
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as PDF Detached dwelling located in small village, surround on south sides by dense woodland, exposed to north. Privacy and overlooking of neighbours led to curved plan with mainly south west and west facing windows. Planners restricted height of building, limited scope for solar panels.
The Greenhouse : 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 | - | - | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | - | - |
|---|---|---|---|
| Annual CO₂ emissions | - | - | - |
| Annual space heat demand | - | 12 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | - | - |
| Annual CO₂ emissions offset by renewable generation | - | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | PassivHaus |
| Other energy targets | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 10 August 2008 | 1.01m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Occupied |
|---|---|
| Start date | 10 September 2007 |
| Occupation date | |
| Location | Sheperdswell, near Dover Kent England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Masonry Cavity |
| Other construction type | Timber framed upper storey |
| Party wall construction | |
| Floor area | 194 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Conker Conservation Ltd |
|---|---|
| Project lead person | Paul Mallion |
| Landlord or Client | Mr and Mrs Williams |
| Architect | Conker Conservation Ltd |
| Mechanical & electrical consultant | Conker Conservation Ltd |
| Energy consultant | Paul Mallion |
| Structural engineer | Alan Baxter Partnership LLP |
| Quantity surveyor | |
| Consultant | |
| Contractor | Eco-Librium Solutions Ltd |
Design strategies
| Planned occupancy | 5 persons |
|---|---|
| Space heating strategy | Post heater on MVHR. Towel rails in bathrooms. Column radiator in Master Bedroom. Condensing gas boiler, Worcester Greenstar. |
| Water heating strategy | Solar thermal ready, panels to be placed on future garage. Backed up by gas boiler. |
| Fuel strategy | Mains gas. Mains electricity |
| Renewable energy strategy | Solar thermal to be installed later. Garage roof will be suitable for PV. |
| Passive Solar strategy | Proximity of woodland limits solar gain, but could allow solar overheating from West. Deep overhanging eaves to south facing windows. |
| Space cooling strategy | Natural cross ventilation. |
| Daylighting strategy | Large areas of south west facing windows, small north windows to smaller rooms. |
| Ventilation strategy | MVHR, intake and exhaust located on north side. Fresh air supply to living space and bedrooms, extract from kitchen and each bathroom/WC. |
| Airtightness strategy | Compriband tapes and sealant to windows and doors. Vapour control layer sealed carefully to timber frame. Additionally external breather membrane sealed to timber frame and junction with masonry. Cavity walls rendered internally and externally. |
| Strategy for minimising thermal bridges | Carbonlite details and passivhaus principles. 20mm plywood window linings to bridge cavity walls. Stainless steel two part cavity ties. |
| Modelling strategy | Modelling in PHPP 2006. |
| Insulation strategy | 300mm mineral wool cavity fill to ground storey, 300mm cellulose fibre to timber framed upper storey. 200mm XPS in floor, 400mm cellulose fibre in roof. |
| Other relevant retrofit strategies | |
| Contextual information | Difficult site due to shading at south end and overlooking of neighbours. Strict planning controls over window location and size, requires most solar gain from west facing windows. |
Building services
| Occupancy | As design stage |
|---|---|
| Space heating | As design stage |
| Hot water | As design stage |
| Ventilation | As design stage |
| Controls | As design stage |
| Cooking | As design stage |
| Lighting | |
| Appliances | |
| Renewable energy generation system | |
| Strategy for minimising thermal bridges | As design stage |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 515m³ |
| Thermal fabric area | 562 m² |
| Roof description | 400mm deep timber I joists with OSB sheathing top and bottom, internal service void and plasterboard. 100mm deep ventilation void and sawn softwood diagonal boards with zinc standing seam roof finish. |
| Roof U-value | 0.08 W/m² K |
| Walls description | Ground storey cavity wall. Internal leaf of 100mm dense concrete blocks, 300mm cavity of mineral wool in 3 layers of 100mm, stainless steel two part ties, external leaf of medium density blocks, rendered finish.First floor of 300mm timber I joists lined both sides with OSB, insulated with cellulose fibre, finished with larch cladding. |
| Walls U-value | 0.11 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | 240mm expanded polystryrene, 150mm concrete slab, 75mm screed. |
| Floor U-value | 0.14 W/m² K |
| Glazed doors description | Triple glazed timber framed units, Geischen supplied by Ecomerchant Ltd Faversham Kent. Not thermally broken frames, but carefully detailed installation with insulation overlapping face of frame. |
| Glazed doors U-value | 0.80 W/m² K uninstalled |
| Opaque doors description | |
| Opaque doors U-value | - - |
| Windows description | Triple glazed timber framed units, Geischen supplied by Ecomerchant. Not thermally broken frames. |
| Windows U-value | 0.80 W/m² K - |
| Windows energy transmittance (G-value) | 0.6 % |
| Windows light transmittance | 0.6% |
| Rooflights description | |
| Rooflights light transmittance | - |
| Rooflights U-value | - |