South Chingford - Ascham Homes: low carbon refurbishment of typical London 1960s street property
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as PDF This project seeks to maximise the inherent qualities and opportunities the property has in order to radically improve its thermal performance.The building envelop is to be markedly enhanced through the application of high performance external thermal insulation (incorporating Vacuum Insulation Panels where possible), windows and doors. In addition, actions will be taken in order to ensure that airtightness is reduced to levels well below current building regulation recommendations for new properties. Mechanical ventilation with heat recovery will allow effective and energy efficient ventilation of the property whilst providing consistent indoor environmental quality.
Retrofit for the future ZA424P
South Chingford - Ascham Homes: low carbon refurbishment of typical London 1960s street property : 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 | 4454 kWh/yr | 1343 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 31945 kWh/yr | 9257 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 455 kWh/m².yr | 133 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 88 kg CO₂/m².yr | 26 kg CO₂/m².yr | - |
| Annual space heat demand | - | 62 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 1200 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 104 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 19 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 | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 27 June 2010 |
| Location | South Chingford London England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Masonry Cavity |
| Other construction type | |
| Party wall construction | Solid Masonary |
| Floor area | 105.2 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Breyer Group PLC |
|---|---|
| Project lead person | Brayer Group, Faringdon Ave, Harold Hill, Romford, Essex, RM3 8ST |
| Landlord or Client | Ascham Homes, Willow House, 869 Forest Road, Walthamstow, London, E17 4UH |
| Architect | Energy Conscious design, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU |
| Mechanical & electrical consultant | Environmental Design Associates, 31 Wick Road, Teddington, Middlesex, TW11 9DN |
| Energy consultant | ECD Project Services, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU |
| Structural engineer | Carter Clack Partnership, 49 Romney Street, Westminster, London, SW1P 3RF |
| Quantity surveyor | Brayer Group, Faringdon Ave, Harold Hill, Romford, Essex, RM3 8ST |
| Consultant | Public Participation, Consultation and Research, Studio 2, 193-197 Long Lane, London, SE1 4PD |
| Contractor | Brayer Group, Faringdon Ave, Harold Hill, Romford, Essex, RM3 8ST |
Design strategies
| Planned occupancy | Property is currently void, but suitable new tenants will be found who buy into the monitoring strategy. They will be fully briefed on their new home and given a simple home information pack to explain the various technologies and controls along with local community facilities, recycling centers and public transport. |
|---|---|
| Space heating strategy | Heating will be provided by a new high efficiency condensing gas boiler and new radiator system. Heat will be recovered from exhaust air via the use of mechanical ventilation with heat recovery unit. |
| Water heating strategy | Hot water will be provided by high efficiency solar collectors and large capacity thermal store with a high efficiency condensing gas boiler as a backup. |
| Fuel strategy | Mains Gas, Mains electricity (delete as appropriate) |
| Renewable energy strategy | Onsite electric production by 1.44 kWp photovoltaic panels and heat production by solar thermal collectors. |
| Passive Solar strategy | Window fenestration has been simplified in proposed replacement windows to maximise solar gain. |
| Space cooling strategy | HRV with summer bypass combined with natural ventilation for summer period. Night purging during heat waves. |
| Daylighting strategy | Window fenestration has been simplified in proposed replacement windows to maximise day light. |
| Ventilation strategy | Heat recovery ventilation and additional natural ventilation by opening windows during summer months as required. |
| Airtightness strategy | All existing vents and chimneys blocked up. New air barrier created by OSB board at ceiling level with taped joints and perimeters taped to masonry walls and plastered over. Service void created bellow this to eliminated penetrations. Windows, floors, junctions and all penetrations sealed with proprietary air tight tapes, membranes and grommets. All voids such as cavities filled to mitigate thermal bypass. |
| Strategy for minimising thermal bridges | Continuous insulation maintained throughout. Geometric thermal bridges minimised. Junctions assessed include: Ground floor junction, external corner, party wall, party roof, party floor, eaves, verge, window jamb, head and sill, door jamb, head and threshold. |
| Modelling strategy | Whole house modeling was undertaken in SAP, with the use of extension sheet produced for this competition. . Dynamic simulation was used to assess the impact of our proposed micro CHP heating system with the results fed back into the SAP extension sheet. |
| Insulation strategy | - The solid ground floor slab will be left un-insulated to minimise tenant disruption. - The existing cavity walls will be filled and externally insulated to achieve a U-value of 0.26 w/m2K at ground floor and 0.16 w/m2K at first floor. - The existing |
| Other relevant retrofit strategies | We propose to fit an intelligent heating controller designed to save energy and improve comfort in residential buildings. The system controls both central and water heating, reducing energy consumption by automatically monitoring and learning occupant behavior and preferences. It also provides an easy to use and simply user interface as well as covering all energy monitoring requirements. |
| Contextual information |
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 |