Retrofit - Appledore, Ashford
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as PDF The key project approach is to develop a solution that uses complementary technologies and techniques, and primarily tackles the whole envelope through well insulating the walls, floors and roof, remedying air gaps and installing MVHR, thus reducing the initial heating load to 23 W/m2. A solar gain heat pump coupled with skirting board heating can then be installed to meet the vastly reduced heating and hot water. Finally, a PV system to offset the dwelling's electrical consumption will be installed. This should be done ideally with the residents remaining in situ. Figures in this database have been based on the no.13 property, heated by electric panels heaters and a log fire.
Retrofit for the future ZA646W
Retrofit - Appledore, Ashford : 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 | 30120.855 kWh/yr | 3634 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | 11084 kWh/yr | 1689 kWh/yr | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 1062 kWh/m².yr | 133 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 218 kg CO₂/m².yr | 26 kg CO₂/m².yr | - |
| Annual space heat demand | - | 48 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 1029 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 102 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 19 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | SAP modelling was also carried out |
| Energy target | Retrofit for the Future |
| Other energy targets | TOTAL PHPP Annual fuel costs: £338 TOTAL PHPP Annual CO2 emissions: 20kg/m2yr TOTAL PHPP Primary Energy: 100 kWh/m2yr Results for property no.14: Predicted Heating Load: 42 kWh/m² and yr Predicted Heating Load: 23 W/m² (demand) TOTAL PHPP |
| Forecast heating load | 23 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | 03 May 2010 |
| Occupation date | 06 August 2010 |
| Location | Appledore, Ashford Kent England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | Cavity has been filled |
| Party wall construction | Uninsulated 250mm masonry cavity |
| Floor area | 82.41 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Housing Services, Ashford Borough Council |
|---|---|
| Project lead person | Giles Holloway |
| Landlord or Client | Ashford Borough Council Housing Services |
| Architect | |
| Mechanical & electrical consultant | B. Ball Contractors |
| Energy consultant | CEN Services Ltd |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor | B. Ball Contractors |
Design strategies
| Planned occupancy | One property (A): Two elderly residents. To be compared to identical adjoining property (B) which houses a single parent family with four children. |
|---|---|
| Space heating strategy | Application of a lightweight dual solar thermal and air source panel (solar gain heat pump system) with a low temperature flow skirting board heating system, will provide space heating and hot water to each of the dwellings. The technology will be backed up by an in-line immersion heater. |
| Water heating strategy | Application of a lightweight dual solar thermal and air source panel (solar gain heat pump system) with a low temperature flow skirting board heating system, will provide space heating and hot water to each of the dwellings. The technology will be backed up by an in-line immersion heater. |
| Fuel strategy | Mains electricity. A will also require minimal columes of logs for their open fire. However, we would envisage that the frequency of use of the fire will be decreased greatly due to the increased comfort that the retrofit works will bring to their home. |
| Renewable energy strategy | A 1.2kWp PV photovoltaic panel array to be installed will be applied to each of the properties. |
| Passive Solar strategy | All homes to have roof space of 15.36m2, within 45 degrees of south. |
| Space cooling strategy | Natural ventilation for most of the cooling season. Daytime use of MVHR with night purging during heat waves. |
| Daylighting strategy | Windows will be brought forward so that window reveals are not significantly increased. |
| Ventilation strategy | Mechanical ventilation with heat recovery (winter) Openable windows (summer) |
| Airtightness strategy | * Windows & doors replaced and sealed * Perimeter sealing of solid ground floor and upper floors |
| Strategy for minimising thermal bridges | * Continuous external wall insluation * Perimeter sealing of solid ground floor and upper floors * Replacement of window sills * Specialist installation of windows to prvent bridging |
| Modelling strategy | Whole house modelling was undertaken in PHPP, including each measure modelled seperately, as well as the final solution. |
| Insulation strategy | * Application of external insulation to solid brick walls ( to achieve U-value of 0.14 W/m2K ); * Insulate solid floor ( to achieve U-value of 0.21 W/m2K) ; * Replacement of insulation in roof ( to achieve U-value of 0.10 W/m2K). |
| Other relevant retrofit strategies | We intend to carry out the major works within 5 days so that the tenants are only displaced for this amount of time and so that all works that may cause discomfort and inconvenience to the tenants are carried out while the property is empty. However, we have also demonstrated how this retrofit strategy can be undertaken with the residents in situ, insulating the floor on a room by room basis. |
| Contextual information | The properties are located in an Area of Outstanding Natural Beauty. A brick coloured render system will therefore be applied to the external wall insulation. Alternatively, a brick clip affect could be applied to this solution. |
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 | 0 |
|---|---|
| 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 |