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Measured data from renewable generation is not yet available.
Pre-development | Forecast | Measured | |
Electricity use | 2684 kWh/yr | 1277 kWh/yr | - |
---|---|---|---|
Natural gas use | 33051 kWh/yr | 6456 kWh/yr | - |
Oil use | - | - | - |
LPG use | - | - | - |
Wood use | - | - | - |
Other Fuel | - | - | - |
Pre-development | Forecast | Measured | |
Primary energy requirement | 422 kWh/m².yr | 100 kWh/m².yr | - |
---|---|---|---|
Annual CO₂ emissions | 79 kg CO₂/m².yr | 20 kg CO₂/m².yr | - |
Annual space heat demand | - | 18 kWh/m².yr | - |
Electricity generation | Forecast | Measured |
---|---|---|
PV array | 1000 kWh/yr | - |
Other Renewables Tech | - | - |
Electricity consumed by generation | - | - |
Primary energy requirement offset by renewable generation | 76 kWh/m².yr | - |
Annual CO₂ emissions offset by renewable generation | 14 kg CO₂/m².yr | - |
Whole house energy calculation method | SAP |
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Other whole house calculation method | PHPP was used to used model the proposed project. The result are reported in the Phase 2 application submission. While they were |
Energy target | Retrofit for the Future |
Other energy targets | Our main focus was to reduce heating demand as far as possible. |
Forecast heating load | 6.9 W/m² demand |
Date | Result | |
Pre-development air permeability test | - | 17.01m³/m².hr @ 50 Pascals |
---|---|---|
Final air permeability test | - | 1.23m³/m².hr @ 50 Pascals |
Stage | Under construction |
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Start date | 01 March 2010 |
Occupation date | 30 June 2010 |
Location | London London England |
Build type | Refurbishment |
Building sector | Public Residential |
Property type | Mid Terrace |
Construction type | Solid Brick |
Other construction type | |
Party wall construction | Solid brick |
Floor area | 106 m² |
Floor area calculation method | Treated Floor Area (PHPP) |
Building certification |
Organisation | Prewett Bizley Architects |
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Project lead person | Prewett Bizley architects |
Landlord or Client | Family Mosaic |
Architect | Prewett Bizley architects |
Mechanical & electrical consultant | The Green Building Store |
Energy consultant | Prewett Bizley |
Structural engineer | Nabeii Consulatancy |
Quantity surveyor | Prewett Bizley |
Consultant | Structures Dept Greenwich University |
Contractor | Manby contracting |
Planned occupancy | This is a family house and we expect a couple with 2 children to take occupancy. |
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Space heating strategy | The space heating has been minimised by insulating the house very well and controlling the ventilation. However, we intend to locate small radiators in each room fed by a combination boiler. All pipe work will be well lagged. The heat emitters will be controlled by a programmer and thermostatic valves. It is unlikely that the radiators will be necessary in all but the coldest months. |
Water heating strategy | The water heating will be done by a combination boiler. All pipe work will be well lagged to reduce losses. |
Fuel strategy | The heating and hot water will be run on mains gas. Everything else will use grid electricity. |
Renewable energy strategy | A south facing PV array will be installed that should yield around 1000 kWh energy per year. |
Passive Solar strategy | Some passive collection naturally forms part of the calculations. However as this project is low impact in terms of the elevations we have not actively adjusted window openings, but instead focussed on reducing heat demand. |
Space cooling strategy | The house can be well cross ventilated and we don't anticipate over heating being a sigificant problem. PHPP calculations support this conclusion. |
Daylighting strategy | Again we have worked with the existing window pattern which provided very good levels of daylighyt generally. We will return one opening to its original (larger) size to jmprove daylight to that room. Elsewhere, daylight levels were very good. |
Ventilation strategy | The house will use an MVHR system and will have very high levels of air tightness to ensure that it works well. We intend that the system works in extract mode during the summer when windows will allow air to flow in and cross ventilation to occur. The system will be one of the new Paul units and its installation will be designed and commissioned by the Green Building Store. |
Airtightness strategy | The air tightness strategy will rely on continuous plastering to all masonry elements internally. These will extend through the joist zone. Where necessary we will use Proclima tapes to achieve interfaces between wet and dry systems of construction. We have achieved air permeability rating of around 1m3/m2h on similar retrofit work in the past. We will use ALDAS to run the tests and provide guidance on where matters can be improved. |
Strategy for minimising thermal bridges | We tried to eliminate cold bridging wherever possible, through good detailing. Where this has been impractical we have extended extra insulation 'socks' over fabric or into the ground to reduce the effect of the bridge as much as possible. We have analysed most of the interfaces with THERM software to achieve the best possible results. This has resulted in a very low entry for psi values within our PHPP and SAP analysis. |
Modelling strategy | We ran the existing and proposed house through SAP model and then used the extension sheet to test for compliance with the competition. We also modelled the proposed condition using PHPP software supported with THERM for psi values. We used this model to tweak the design for optimal performance. |
Insulation strategy | Front wall internally insulated. Rear wall externally insulated |
Other relevant retrofit strategies | We developed details for 2 interface details: -gutter extension to act as a stop to external rendered insulation -decoupling device to get end of timber joist out of front wall. These detail prototypes were developed to reduce thermal bridging and ensure that the proposed development would be robust and sound for many years to come. This strategy addresses concerns we have with how some retrofit work may compromise the building fabric that it is supposed to enhance. |
Contextual information |
Occupancy | NULL |
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Space heating | NULL |
Hot water | NULL |
Ventilation | NULL |
Controls | NULL |
Cooking | NULL |
Lighting | NULL |
Appliances | NULL |
Renewable energy generation system | NULL |
Strategy for minimising thermal bridges | NULL |
Storeys | |
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Volume | - |
Thermal fabric area | - |
Roof description | NULL |
Roof U-value | 0.00 W/m² K |
Walls description | NULL |
Walls U-value | 0.00 W/m² K |
Party walls description | NULL |
Party walls U-value | 0.00 W/m² K |
Floor description | NULL |
Floor U-value | 0.00 W/m² K |
Glazed doors description | NULL |
Glazed doors U-value | 0.00 W/m² K - |
Opaque doors description | NULL |
Opaque doors U-value | 0.00 W/m² K - |
Windows description | NULL |
Windows U-value | 0.00 W/m² K - |
Windows energy transmittance (G-value) | - |
Windows light transmittance | - |
Rooflights description | NULL |
Rooflights light transmittance | - |
Rooflights U-value | 0.00 W/m² K |