Compton, Berkshire
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as PDF This project involves a radical whole house approach to the refurbishment of a 1950s semi detached property. The idea is to upgrade the thermal performance. Our approach to energy saving and CO2 reduction is to follow a lean-clean-green hierarchy: seeking to minimise heat losses from the propertys thermal fabric and ventilation method; to supply residual space and water heating using replicable, low carbon technology; to minimise lighting and appliance energy loads; and finally to consider micro-generation using proven, renewable energy systems.
Retrofit for the future ZA343S
Compton, Berkshire : 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 | 37050 kWh/yr | 3738 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 962 kWh/m².yr | 97 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 227 kg CO₂/m².yr | 23 kg CO₂/m².yr | - |
| Annual space heat demand | - | 57 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 1671 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 54 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 13 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 | - | 4.19m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 2.54m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 26 July 2010 |
| Location | Compton Berkshire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | |
| Party wall construction | Solid masonry |
| Floor area | 96.3 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | ECD Architects |
|---|---|
| Project lead person | Energy Conscious design, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU |
| Landlord or Client | Southern Housing Group, PO Box 643 Horsham, West Sussex RH12 1XJ |
| 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 | The Keegans Group, Studio 2, 193-197 Long Lane, London, SE1 4PD |
| Consultant | Public Participation, Consultation and Research, Studio 2, 193-197 Long Lane, London, SE1 4PD |
| Contractor | TBC |
Design strategies
| Planned occupancy | Existing Tennants - Family, 2 adults and 2 children. |
|---|---|
| Space heating strategy | Heating will be provided by a Ground source heat pump 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 solar thermal panels and large capacity thermal store with a ground source heat pump as backup.. |
| Fuel strategy | Electricity |
| Renewable energy strategy | Onsite electric production by 1.4 kWp photovoltaic panels and solar thermal. |
| 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 walls will be clad externally with an insulated render system to give a U-value of 0.15 w/m2K. - The existing windows will be replaced with high perfo |
| 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. Also the works will be carried out with a tenant in-situ, a common issue with retrofit works. |
| Contextual information | A large proportion of the UK housing stock consists of semi detached houses with gardens in suburban or rural locations. There are still many places in the UK which have no supply of mains gas, in particular rural villages such as Compton in Berkshire. Manor Crescent is a house which has already undergone Decent Homes improvements but does not presently provide satisfactory living conditions. Works such as window replacement and loft/cavity wall insulation have previously been carried out in a piecemeal fashion and have resulted in condensation and mould growth and the tenant reports less than satisfactory comfort levels |
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 |