PassivHaus Retrofit - Octavia Housing
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as PDF PassivHaus retrofit of a three storey solid brick Victorian terraced house in a conservation area. Produce a comfortable and healthy house that requires no conventional heating system. Our focus will be on the key areas of insulation, airtightness and thermal bridging whilst we will also use innovative renewable and low energy technologies to generate heat and power on site. Heat loss and airtightness will be measured before and after the retrofit. We will install ongoing monitoring equipment in two identical properties, which will act as control houses (renovated to Decent Homes and Decent Homes plus only)
Retrofit for the future ZA152J
PassivHaus Retrofit - Octavia Housing : 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 | - | 5359 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | 151 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | - | 36 kg CO₂/m².yr | - |
| Annual space heat demand | - | 11 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 151 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 36 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 | 7.2 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Occupied |
|---|---|
| Start date | 12 April 2010 |
| Occupation date | 28 February 2011 |
| Location | London London England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Solid Brick |
| Other construction type | Exposed Bricks |
| Party wall construction | Solid Brick |
| Floor area | 89 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  Passivhaus certified building |
Project Team
| Organisation | Octavia Housing |
|---|---|
| Project lead person | Green Tomato Energy |
| Landlord or Client | Octavia Housing |
| Architect | Paul Davis and Partners |
| Mechanical & electrical consultant | Princedale Ltd. |
| Energy consultant | Eight Associates |
| Structural engineer | Brian James |
| Quantity surveyor | Pellings |
| Consultant | n/a |
| Contractor | Princedale Ltd. |
Design strategies
| Planned occupancy | family of 6 people |
|---|---|
| Space heating strategy | labyrinth heat exchanger air source heat pump to provide additional heating through the MVHR system when required |
| Water heating strategy | solar thermal heat pump in MVHR unit to provide back up hot water |
| Fuel strategy | sunelectricity from grid |
| Renewable energy strategy | none |
| Passive Solar strategy | full use of solar gains in winter |
| Space cooling strategy | labyrinth heat exchanger provides cooling in summer |
| Daylighting strategy | light colours existing windows |
| Ventilation strategy | balanced mechanical ventilation with heat recovery (MVHR) |
| Airtightness strategy | continuous OSB layer between layers of insulation, taped at joints |
| Strategy for minimising thermal bridges | secondary structure to support floor joists detached from the main external walls |
| Modelling strategy | SAP & PHPP |
| Insulation strategy | internal insulation continuous throughout the building |
| Other relevant retrofit strategies | triple glazed sash windows, highly insulated doors |
| Contextual information | conservation area |
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 |