Passiv Haus Retrofit: refurb and regenerate

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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
Images Graphs Figures Description Strategies Building

Passiv Haus Retrofit: refurb and regenerate : Project images

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CO2 emissionsPrimary energy requirement
Energy target
Retrofit for the Future

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions
Renewables

Measured data from renewable generation is not yet available.

Fuel use

 Pre-developmentForecastMeasured
Electricity use 5500 kWh/yr 1360 kWh/yr 2668 kWh/yr
Natural gas use17500 kWh/yr 4600 kWh/yr 5775 kWh/yr
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
 Pre-developmentForecastMeasured
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 generationForecastMeasured
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

 DateResult
Pre-development air permeability test03 August 201014.53m³/m².hr @ 50 Pascals
Final air permeability test01 January 20132.75m³/m².hr @ 50 Pascals

Project description

StageUnder construction
Start date01 February 2010
Occupation date15 June 2010
Location Liverpool Merseyside  England
Build typeRefurbishment
Building sectorPublic Residential
Property typeEnd Terrace
Construction typeSolid Brick
Other construction typeSolid Brick = 220mm
Party wall constructionUninsulated Party Wall
Floor area 89.2
Floor area calculation method Treated Floor Area (PHPP)
Building certification

Project Team

OrganisationPlus Dane Group
Project lead personPlus Dane Group
Landlord or ClientPlus Dane Group
ArchitectLarrosa Marshall
Mechanical & electrical consultant Rodney Enviro
Energy consultantCamco
Structural engineerPenny Lane
Quantity surveyorPenny Lane
ConsultantParity Projects, Maple
ContractorPlus Dane Group

Design strategies

Planned occupancyFamily of four, living 'PassivHaus' low energy lifestyle.
Space heating strategyHeat reovered from ventilation. Supplementary heating from mains gas fired boiler feeding radiators.
Water heating strategySolar hot water through Solartwin system, with gas condensing boiler back up.
Fuel strategyMains Gas. Mains electricity.
Renewable energy strategy
Passive Solar strategySouth facing windows with proportions optimised for solar gain.
Space cooling strategyNatural ventilation and daytime use of MVHR. Adequate shading and night-time ventilation.
Daylighting strategyAdequate daylight factor.
Ventilation strategyVentilation 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 strategyWhole 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 strategyInternal 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 strategiesA 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

OccupancyNULL
Space heatingNULL
Hot waterNULL
VentilationNULL
ControlsNULL
CookingNULL
LightingNULL
AppliancesNULL
Renewable energy generation systemNULL
Strategy for minimising thermal bridgesNULL

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