Passiv Haus Retrofit: refurb and regenerate
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as PDF This is a highly innovative and truly inspirational project, which incorporate the principles behind PassivHaus within the extensive refurbishment of the property. By combining works in the right order, we will maximise cost effectiveness of the project. This pioneering approach will address all the energy needs of the property with a comprehensive package of measures, to achieve a significant emissions reduction. The work will transform the property - this is not only about making good, but also about making a fundamental change which will bring the house back into use.
Retrofit for the future ZA390M
Passiv Haus Retrofit: refurb and regenerate : 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 | 5500 kWh/yr | 1360 kWh/yr | 2668 kWh/yr |
|---|---|---|---|
| Natural gas use | 17500 kWh/yr | 4600 kWh/yr | 5775 kWh/yr |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 380 kWh/m².yr | 97 kWh/m².yr | 149 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 77 kg CO₂/m².yr | 20 kg CO₂/m².yr | 31 kg CO₂/m².yr |
| Annual space heat demand | 234.38 kWh/m².yr | 29 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 | 97 kWh/m².yr | 149 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 20 kg CO₂/m².yr | 31 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 | 13 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | 03 August 2010 | 14.53m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | 01 January 2013 | 2.75m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 February 2010 |
| Occupation date | 15 June 2010 |
| Location | Liverpool Merseyside England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | End Terrace |
| Construction type | Solid Brick |
| Other construction type | Solid Brick = 220mm |
| Party wall construction | Uninsulated Party Wall |
| Floor area | 89.2 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Plus Dane Group |
|---|---|
| Project lead person | Plus Dane Group |
| Landlord or Client | Plus Dane Group |
| Architect | Larrosa Marshall |
| Mechanical & electrical consultant | Rodney Enviro |
| Energy consultant | Camco |
| Structural engineer | Penny Lane |
| Quantity surveyor | Penny Lane |
| Consultant | Parity Projects, Maple |
| Contractor | Plus Dane Group |
Design strategies
| Planned occupancy | Family of four, living 'PassivHaus' low energy lifestyle. |
|---|---|
| Space heating strategy | Heat reovered from ventilation. Supplementary heating from mains gas fired boiler feeding radiators. |
| Water heating strategy | Solar hot water through Solartwin system, with gas condensing boiler back up. |
| Fuel strategy | Mains Gas. Mains electricity. |
| Renewable energy strategy | |
| Passive Solar strategy | South facing windows with proportions optimised for solar gain. |
| Space cooling strategy | Natural ventilation and daytime use of MVHR. Adequate shading and night-time ventilation. |
| Daylighting strategy | Adequate daylight factor. |
| Ventilation strategy | Ventilation with heat recovery through Paul Multi MVHR unit. Openable 'tilt and turn' Nordan NTech Passiv design windows. |
| Airtightness strategy | A thorough process of sealing the building will be undertaken to ensure all air paths are eliminated, assisted by the male/ female jointing detailing of the Maple wall and floor insulation system, which gives exceptionally good air tightness. Air tightness detailing (male female joints) is inherent in the structure to help achieve an exceptionally low air tightness of 1m3/m2/h. Thermal plasterboard to party walls. |
| Strategy for minimising thermal bridges | Continuous insulation maintained throughout. MMC (Modern Method of Construction) system will be used, through the Maple SupaWall and Supafloor system. The MVHR unit is entirely sound-proofed and heat-insulated, avoiding thermal bridging. |
| Modelling strategy | Whole house modelling was undertaken in PHPP. For calculating U-values of materials, we have been provided information by suppliers, and used the BRE U-value calculator. U-value calculations for Supawall and Supafloor have been verified using hot box testing by the National Physical Laboratory. |
| Insulation strategy | Internal wall insulation: SupaWall is a closed timber-framed panel, comprising 140mm studs sheathed both sides with Oriented Strand Board (OSB) and filled with polyurethane foam insulation. Floor insulation: SupaFloor allows insulated ground floor sections to be installed after removal of the existing board and joists - replacing these with a close-tolerance interlocking insulated floor complete with ready-finished floorboard. For this project, the U-value for the SupaWall is 0.11 W/m2K, and for the SupaFloor 0.12W/m2K. Loft insulation to achieve U-value 0.15W/m2. |
| Other relevant retrofit strategies | A key part of this project is not only retrofitting a house to PassivHaus standard, but also enabling the tenants to live a PassivHaus lifestyle. Supplying low energy appliances and engagement with the future occupiers is an essential part of this project, to ensure they understand how the house is designed, how to operate it to its optimum performance, and to deliver maximum comfort. |
| Contextual information |
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 |