5Pev : Project images
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Energy and fuel use
Renewable electricity generation This project has used the contributions from renewable electricity generation equipment to either meet the Retrofit for the Future target or otherwise reduce the Primary energy requirement and CO₂ emissions associated with the project.
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | 1400 kWh/yr | 900 kWh/yr | 1003 kWh/yr |
|---|---|---|---|
| Natural gas use | 12700 kWh/yr | 2600 kWh/yr | 2707 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 216 kWh/m².yr | 62 kWh/m².yr | 67 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 41 kg CO₂/m².yr | 13 kg CO₂/m².yr | 14 kg CO₂/m².yr |
| Annual space heat demand | - | 20 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | - | 3100 kWh/yr |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 62 kWh/m².yr | -25 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 13 kg CO₂/m².yr | -8 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | |
| Other energy targets | - |
| Forecast heating load | 1800 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 05 December 2013 | 15m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 04 December 2014 | 0.75m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 May 2014 |
| Occupation date | 01 December 2014 |
| Location | Chorlton Manchester England |
| Build type | Refurbishment |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Masonry Cavity |
| Other construction type | Brick and hollow block with 50mm UF filled cavity |
| Party wall construction | |
| Floor area | 84 m² |
| Floor area calculation method | Actual Floor Area (SAP) |
| Building certification |
Project Team
| Organisation | Waxwing Energy |
|---|---|
| Project lead person | Gervase Mangwana |
| Landlord or Client | Sonia Mangwana |
| Architect | none |
| Mechanical & electrical consultant | |
| Energy consultant | Nick Parsons |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | Two Adults and one baby born 6 months after occupancy. One adult working at any one time not always away from home during day. |
|---|---|
| Space heating strategy | Mains gas system boiler 12 kW. Underfloor heating to ground floor. Rads in office and bathroom. Bedrooms unheated. Mechanical Ventilation with Heat recovery. |
| Water heating strategy | 150l cylinder heated via gas boiler. Surplus generated electricity from PV array diverted to immersion when available. |
| Fuel strategy | Mains Gas. Mains electricity. PV electricity |
| Renewable energy strategy | 3.3 kWp array installed 2011 |
| Passive Solar strategy | House within 15 of south. Glazing not optimised. Overheating now occurring. |
| Space cooling strategy | Natural ventilation for most of the cooling season. Daytime use of MVHR with night purging during heat waves. |
| Daylighting strategy | Unknown |
| Ventilation strategy | MVHR via radial semi flexible ducting system supplying 5 habitable areas and 5 wet rooms |
| Airtightness strategy | Target of 2 m3/m2/h. The full strip out gave the opportunity to complete a total airtight layer. |
| Strategy for minimising thermal bridges | Designed out as far as possible. Ceiling joists run through to eaves. One continuous bridge on front plinth wall where aerated block is used to mitigate. |
| Modelling strategy | Very basic heatloss calculations |
| Insulation strategy | Internal PIR to cavity walls. Same to timber frame front and back with woodfibre external to allow vapour to permeate outwards. |
| Other relevant retrofit strategies | Attempted to reuse as much as possible from original house. For example staircase was removed and stored in the garden whilst the internal walls were insulated. |
| Contextual information | The biggest constraints were a self imposed budget of 60,000 (actual 75k) and project length of 6 months (actual 7). These precluded extensions that were considered. Also affected choice of glazing. |
Building services
| Occupancy | 2 adults one very young child |
|---|---|
| Space heating | As design |
| Hot water | As design |
| Ventilation | As design |
| Controls | as design |
| Cooking | Gas hob, electric oven |
| Lighting | Led throughout |
| Appliances | A+++ washing machineA++ Fridge freezer |
| Renewable energy generation system | As pre build |
| Strategy for minimising thermal bridges | As design |
Building construction
| Storeys | 2 |
|---|---|
| Volume | 210m³ |
| Thermal fabric area | 206 m² |
| Roof description | Cold roof insulated at ceiling height with a mix of mineral wool and PIR at the edges where roof slope limits full fill |
| Roof U-value | 0.10 W/m² K |
| Walls description | Cavity walls pre filled and then internally insulated with PIR. Stud walls internally insulated with PIR, filled with mineral wool and externally insulated with wood fibre. |
| Walls U-value | 0.15 W/m² K |
| Party walls description | none |
| Party walls U-value | - |
| Floor description | Dry screed raft on PIR |
| Floor U-value | 0.12 W/m² K |
| Glazed doors description | uPVC 40mm triple glazed |
| Glazed doors U-value | 1.00 W/m² K uninstalled |
| Opaque doors description | None |
| Opaque doors U-value | - - |
| Windows description | Downstairs uPVC 40mm triple glazedUpstairs existing double glazed frames reglazed with low-e, warm spacer, argon filled 28mm units |
| Windows U-value | 1.00 W/m² K - |
| Windows energy transmittance (G-value) | 0.58 % |
| Windows light transmittance | 0.74% |
| Rooflights description | none |
| Rooflights light transmittance | - |
| Rooflights U-value | - |