Enfield Homes retrofit, Enfield
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as PDF This project will focus on a property in the heart of the borough that offers particular challenges and will seek to establish a complementary and replicable set of measures which significantly reduce energy use and CO2 emissions. The proposed package of thermal insulation upgrades will go far beyond basic provision carried out to date, using ECD Architects retrofit experience to comprehensively address thermal bridging concerns and fabric air tightness whilst simultaneously employing advanced insulation materials to address heat loss. The whole house approach will also include market leading replacement fenestration. MVHR and cutting edge micro-generation technology in the form of both Combined Heat & Power and photovoltaics.
Retrofit for the future ZA628L
Enfield Homes retrofit, Enfield : 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 | 20013 kWh/yr | 1778.58 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | 5261.94 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 678 kWh/m².yr | 142 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 160 kg CO₂/m².yr | 29 kg CO₂/m².yr | - |
| Annual space heat demand | - | 45 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 1540 kWh/yr | - |
| Micro CHP | 568.2600098 kWh/yr | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 71 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 12 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | - |
| Forecast heating load | 18 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 10.57m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 5.59m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 26 July 2010 |
| Location | Enfield London England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | End Terrace |
| Construction type | Other |
| Other construction type | Brick cavity wall, brick solid wall and tile clad solid wall |
| Party wall construction | Solid masonary |
| Floor area | 73.8 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Enfield Homes |
|---|---|
| Project lead person | Enfield Homes, 36-44 South Mall, The Edmonton Centre, Edmonton Green, London, N9 0TN |
| Landlord or Client | Enfield Homes, 36-44 South Mall, The Edmonton Centre, Edmonton Green, London, N9 0TN |
| 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 | Enterprise, Sandridge Gate Business Centre, Ronsons Way, St Albans Rd, Sandridge, AL4 9XR |
Design strategies
| Planned occupancy | Property is currently void, but suitable new tenants will be found who agree to participate in monitoring and they will be fully briefed on their new home and given a simple Home Information pack to explain the various technologies and controls. |
|---|---|
| Space heating strategy | Heating will be provided by mains gas via a micro CHP unit new radiator system. Heat will be recovered from exhaust air via the use of mechanical ventilation with high efficiency heat recovery unit. |
| Water heating strategy | Hot water will be provided by mains gas via a micro CHP unit and new hot water cylinder |
| Fuel strategy | Mains Gas, Mains electricity |
| Renewable energy strategy | Onsite electric production by 2.1 kWp photovoltaic panels and low carbon electricity production via gas fired micro CHP unit. |
| Passive Solar strategy | Window fenestration has been simplified in proposed replacement windows to maximise solar gain. |
| Space cooling strategy | MVHR 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 | Mechanical ventilation with heat recovery 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 both PHPP and SAP, with the use of extension sheets for both. The results provided for existing energy usage were calculated in SAP, as this software is more suitable for modeling poor performing buildings. The proposed results were modeled in PHPP as this software is more accurate for predicating energy usage in high performing buildings. Dynamic simulation was used to assess the impact of our proposed micro CHP heating |
| Insulation strategy | -The existing walls will be clad externally with a combination of vacuum insulted panels and rigid phenolic board, giving a U-value of 0.15 w/m2K in just 65mm depth. - The existing windows will be replaced with high performance Passivhaus standard window |
| 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 | Enfield Homes is an Arms Length Management Organisation set up by Enfield Council to manage its homes and to improve housing services. This project will focus on a property in the heart of the borough that offers particular challenges in relation to low carbon retrofit and will seek to establish a complementary and replicable set of measures which significantly reduce energy use and CO2 emissions associated with this particular form of dwelling. The measures are intended to be carried out whilst the ...property is unoccupied. It is intended that the findings will inform the remainder of Enfield Homes similar properties. As this property is also part of a terrace it will be subject to a planning application |
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 |