Eco-retrofit Colne
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as PDF This tenure-neutral whole-house solution on an existing hard-to-treat property aims to meet low CO2 objectives by the innovative retrofitting of Passivhaus standards . The UK-based supply chain includes an innovative internal superinsulation, an air source heat pump with integral mechanical ventilation with heat recovery, space-saving low H2O radiators, and specially-fabricated Passivhaus-standard windows. This is a radical all-electric solution and a first-of-its-kind retrofit in an area where many properties require extensive renovation.
Retrofit for the future ZA614G
Eco-retrofit Colne : 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 | 3779 kWh/yr | 4189 kWh/yr | 9558 kWh/yr |
|---|---|---|---|
| Natural gas use | 9302 kWh/yr | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 227 kWh/m².yr | 118 kWh/m².yr | 269 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | 47 kg CO₂/m².yr | 28 kg CO₂/m².yr | 64 kg CO₂/m².yr |
| Annual space heat demand | - | 23 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| 0.9kWp photovoltaics | 574.2700195 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 102 kWh/m².yr | 269 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | 24 kg CO₂/m².yr | 64 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | - |
| Energy target | Retrofit for the Future |
| Other energy targets | Original target for space heating demand was 15 kwh/m2/year as per Passivhaus standards. This was reduced to balance reduction of loss to the internal floor area. Main targets include a total Annual CO2 emissions: 17 kg/m2/yr and total Primary energy: 11 |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | 4.22m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 12 April 2010 |
| Occupation date | 26 July 2010 |
| Location | Colne Lancashire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Solid Brick |
| Other construction type | Brick wall with stone facing |
| Party wall construction | Two leaves of brick with a minor, inconsistent cavity |
| Floor area | 88.78 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Housing Pendle |
|---|---|
| Project lead person | Housing Pendle |
| Landlord or Client | Housing Pendle |
| Architect | Broadway Malyan Ltd. |
| Mechanical & electrical consultant | |
| Energy consultant | Broadway Malyan Ltd. |
| Structural engineer | |
| Quantity surveyor | Wates Living Space North West |
| Consultant | |
| Contractor | Wates Living Space North West |
Design strategies
| Planned occupancy | This property is currently void, but will be occupied following the retrofit works. It is a two-bedroom family property with a possible occupancy of four people made up of two adults and two children. This is to be confirmed nearer the date by the Landlord. |
|---|---|
| Space heating strategy | Exhaust air source heat pump (ASHP) solution serving slimline high-efficiency radiators with LTHW @55 deg C. In-built MVHR recovers heat from bathroom and kitchen. |
| Water heating strategy | Domestic hot water will be delivered via an integrated thermal store within the indoor Air Source Heat Pump unit. |
| Fuel strategy | This is an ultra-low all-electric solution, offset by roof photovoltaic electricity generation. |
| Renewable energy strategy | 0.9kWp roof-mounted photovoltaics to be installed. |
| Passive Solar strategy | New high performance low solar transmission glazing replaces existing large windows to living areas and bedrooms reducing overheating risks in Summer but allowing passive solar energy as per Passivhaus principles. This is an approximately East-West facing mid-terrace house with kitchen area getting solar access in the morning and living area getting solar access in the evening. |
| Space cooling strategy | Cooling effect available from cross flow ventilation via MVHR system, plus openable windows for natural ventilation in Summer months. |
| Daylighting strategy | Existing window sizes and positions are retained although new secure windows are provided to allow good daylight factors into all living and kitchen areas. The two reception rooms achieve average daylight factors of at least 1.5% but the kitchen does not currently meet a minimum average daylight factor of at least 2%. This is compensated as much as possible using low energy lighting. |
| Ventilation strategy | High efficiency MVHR system linked to exhaust air heat pump system. Openable windows for single-sided room ventilation. |
| Airtightness strategy | Significant improvement, targetting Passivhaus standards. An 'Airtightness Champion' will coordinate between consultants and trade sub-contractors on site. Laps in membranes to be rigorously sealed. Gaps around window/door frames to be sealed. All windows and external doors to be draughtstripped. Holes around services passing through the external wall to be sealed.Holes around service pipes passing through suspended timber floors, around light fittings and pull cords in the ceiling to be sealed. Joints between the ceiling and the external wall to be sealed. Joints between drylining and skirting board to be sealed. Suspended floor air barrier to rear of property and new extension to be sealed direct to masonry wall. Loft area compartmented. |
| Strategy for minimising thermal bridges | Returns in internal insulation to match reveals as part of continuous insulation. All major elements and their junctions considered. Specially-fabricated "Passivhaus-standard" doors and windows in particular specified to reduce thermal bridging through frames and fittings |
| Modelling strategy | Whole house dynamic modelling was undertaken in an iterative manner using ies ve software, SAP 2005 9.81 + SAP extension - see energy forecast below. ies ve software used with SAP interface (SAP2005 9.81 via JPA Designer vr 4.04b1 build 002). |
| Insulation strategy | Targeting Passivhaus standards, therefore considered use of internal superinsulation to solid external and party walls (to achieve U-value of 0.15 W/m2K); high performance windows (to achieve U-value of 0.7 W/m2K). Extensive upgrades also include new doors (to achieve U-value of 0.9 W/m2K). Existing suspended floor insulated (to achieve U-value of 0.201 W/m2K). The renewal of the existing roof and placement of insulation between and under existing rafters in addition to joist level to create warm roof (to achieve U-value of 0.15 W/m2K). |
| Other relevant retrofit strategies | Low energy lights, appliances, cooking and water-saving devices are also going to be supplied and installed. Despite property being currently void, some of the retrofit can be undertaken with tenants in situ (e.g. installation of Heat Pump etc.). Additional data logging devices proposed to provide enhanced monitoring feedback to exceed TSB base specification. |
| Contextual information | As the house will be undergoing Decent Homes works, the Retrofit for the Future works will be undertaken in conjunction to align trades and take the opportunity to undertake a whole-house retrofit. |
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 |