Peterborough EnviroCluster Retrofit Project
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as PDF The comprehensive upgrade of the fabic and services of a 1970s, masonry construction, two storey, three bedroom, semi-detached house to effect an 87% reduction in its overall energy consumption. Including: fully insulating the building and installing super-high performance windows and doors, making the fabric air and wind-tight; installing a sun-space and wind lobby, Installing solar thermal water heating; installing pv micro generation (incorporating battery storage and export to grid facilities); installing heat exchange technology into the fresh air input, together with pre-heated air from the sun-space and roof labyrinth.
Retrofit for the future ZA313T
Peterborough EnviroCluster Retrofit Project : 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 | 547 kWh/yr | 1097 kWh/yr | 2253 kWh/yr |
|---|---|---|---|
| Natural gas use | 23490 kWh/yr | 2569 kWh/yr | 2665 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 372 kWh/m².yr | 75 kWh/m².yr | 114 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 68 kg CO₂/m².yr | 15 kg CO₂/m².yr | 25 kg CO₂/m².yr |
| Annual space heat demand | - | 28 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Roof mounted Photovoltaic panels | 798 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 49 kWh/m².yr | 114 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 9 kg CO₂/m².yr | 25 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | - |
| Forecast heating load | 16.5 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 10.05m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 3.33m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 03 May 2010 |
| Occupation date | 30 October 2010 |
| Location | Peterborough Cambridgeshire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | 280mm o/a brick, uninsulated cavity, blockwork, plaster |
| Party wall construction | 220mm (approx) block, uninsulated cavity, blockwork, plaster |
| Floor area | 76.25 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | UK Centre for Economic and Environmental Development |
|---|---|
| Project lead person | UK Centre for Economc and Environmental Development (UKCEED) |
| Landlord or Client | Axiom Housing Association |
| Architect | Waterland Associates |
| Mechanical & electrical consultant | Cunnington Clarke |
| Energy consultant | Cambridge Centre for Energy Studies (Cambrdge University) |
| Structural engineer | Stanza Consulting |
| Quantity surveyor | Davis Langdon (Peterborough) |
| Consultant | Moixa Energy |
| Contractor | Larkfleet Homes |
Design strategies
| Planned occupancy | The property is a family home, with the principal tenants being a late middle aged couple, with adult children and grand children. Some of the adult children reside sporadically with the principal residents and the grand children regularly spend the night at the premises. |
|---|---|
| Space heating strategy | Heating from existing (SEDBUK 'A' Rated) gas fired combination boiler, through existing radiators. Solar thermal system feeds into the boiler. |
| Water heating strategy | Existing gas fired combination boiler with feed-in water from solar panels and thermal store. No electric back-up. |
| Fuel strategy | Mains Gas, Mains Electricity |
| Renewable energy strategy | 1kWp photovoltaic panel array on the roof. |
| Passive Solar strategy | Solar collection provision in new roof structure (thermal labyrinth) and in exterior thermal cladding (glazed, solar capture elements). Solar heated (tempered) air feeds into Whole House Heat Recovery Ventilation System. |
| Space cooling strategy | Natural ventilation and shading incorporated into exterior cladding. Summer bypass and night purging using Whole House Ventilation system. |
| Daylighting strategy | Daylighting provision remains as is, with glazing interventions maintaining average 2% daylight factor in kitchen and 1.5% in living spaces. |
| Ventilation strategy | Whole House Heat Recovery Ventilation with summer bypass. |
| Airtightness strategy | It is proposed to fully insulate the building externally (on the exterior of the existing fabric), effectively wrapping the entire building envelope in, between 200mm & 400mm of, insulation. Into this insulation zone it is proposed to install a wind and air-tightness membrane so that the entire house is fully wind and air-tight. Special measures will be incorporated at the existing openings (windows, doors, service penetrations etc) to ensure the minimum air infiltration at these points. The existing air-tighness is 10.82 m3/hr.m sq The proposed air tightness will be 0.6 m3/hr.m sq |
| Strategy for minimising thermal bridges | It is proposed to fully insulate the building externally (on the exterior of the existing fabric), effectively wrapping the entire building envelope in, between 200mm & 400mm of, insulation. As a result of this strategy for the insulation, the existing fabric of the building is isolated from the external environment, thus eliminating almost all potential themal bridges. It will be necessary as part of the construction works to investigate the situation at the current points of cavity closure (around windows doors etc) and if necessary take remedial action; allowance has been made for this. |
| Modelling strategy | SAP (2005) with Extension for Whole House v1.6. |
| Insulation strategy | It is proposed to fully insulate the building externally (on the exterior of the existing fabric), effectively wrapping the entire building envelope in, between 200mm(walls) & 400mm(roof) of, insulation. In addition to this it is proposed to insulate above the existing floor using 20mm of vacuum insulated panels and the doors and windows are all to be replaced with super-high performance alternatives. U-Values W/(mK) Existing Roof 2.0; First Floor Ceiling n/a; Walls 1.80; Ground Floor 0.52; Windows 2.80; Doors 3.00. Proposed Roof 0.10; First Floor Ceiling 0.22; Walls 0.16; Ground Floor 0.31; Windows 0.80; Doors 0.65. |
| Other relevant retrofit strategies | We are planning to carry out our package of retrofit measures with tenants remaining, as far as possible, in the dwelling during the proposed works. We intend to demonstrate our approach can be undertaken with minimal disruption to the tenants and with no associated temporary re-housing costs |
| Contextual information | Peterborough is flat and low lying on the edge of the Fens and subject to S-W prevailing winds. Bretton was built on a II World War airfield and is flat and exposed. Extensive, mature (25-30 yrs.) tree planting offers protection. Mid-density 3 and 2 storey housing provides a dense housing area with intermittent open space and access corridors. The site is surrounded with similar 1970s buildings, which the Local Authority Development Control Department do not consider to be of architectural significance. Advice has been sought from the Senior Development Control Officer and he has confirmed that the proposed development would be welcomed as an improvement on the existing local architectural style. |
Building services
| Occupancy | NULL |
|---|---|
| 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 |
Building construction
| Storeys | |
|---|---|
| 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 |