Tackling Solid Walled Voided Properties - Optimising Internal Wall Insulation Solutions.
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as PDF This project is addressing the key barriers to internal wall insulation (disruption to occupiers and loss of living area) to by installing a new, thin, super insulation (Spacetherm) to social houses in the void process (empty between tenancies) along with other internal work to identify the marginal cost. We will assess the carbon performance of 3 properties fitted with different combinations of measures; one property to be insulated with Spacetherm (floor as well as walls) and heated with an ASHP and PV (ie test the thin IWI with a low temperature heating system), one property to be insulated with Spacetherm and heated with a combination boiler and the third property to be insulated with cheap but thick IWI product and a system boiler.
Retrofit for the future ZA391Y
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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 | 1512 kWh/yr | 4658 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 29533 kWh/yr | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 503 kWh/m².yr | 155 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 93 kg CO₂/m².yr | 37 kg CO₂/m².yr | - |
| Annual space heat demand | - | 41 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| PV | 1667 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 99 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 24 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 | - |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | 15 March 2010 |
| Occupation date | 01 June 2010 |
| Location | Wakefield (most likely) West Yorkshire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Mid Terrace |
| Construction type | Stone |
| Other construction type | |
| Party wall construction | |
| Floor area | 75 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Yorkshire Housing |
|---|---|
| Project lead person | Yorkshire Housing |
| Landlord or Client | Yorkshire Housing |
| Architect | |
| Mechanical & electrical consultant | |
| Energy consultant | |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | Camco, |
| Contractor | Parity Projects |
Design strategies
| Planned occupancy | To be determined - will choose houses in the void process. |
|---|---|
| Space heating strategy | Heating from air source heat pump and six radiators. Mechanical ventilation with heat recovery. |
| Water heating strategy | Hot water form air source heat pump with cylinder, top up with immersion heater. |
| Fuel strategy | Mains and PV electricity. Air source heat pump. |
| Renewable energy strategy | 2 kWp photovoltaic panel array and 7kw air source heat pump to be installed. |
| Passive Solar strategy | |
| Space cooling strategy | Natural cooling with open windows in summer. Mechanical ventilation with heat recovery also installed. |
| Daylighting strategy | Large windows and little overshading |
| Ventilation strategy | Natural ventilation with open windows most of the time. Mechanical ventilation with heat recovery in kitchen and bathroom. |
| Airtightness strategy | 3 tests to ensure target is reached. Dry-lining all walls |
| Strategy for minimising thermal bridges | Assessing all junctions when installing internal wall insulation. |
| Modelling strategy | Figures were calculated from SAP modelling (NHER plan assessor software) and the SAP extension worksheet provided by TSB with applying the measures proposed for the third property, the 'super house'. Result was 15kgCO2/yr/m2. To calculate the predicted carbon savings, sufficient data for a typical property was collected to enable a baseline SAP assessment to be carried out and compared to the super house. |
| Insulation strategy | Application of internal wall insulation to solid walls ( to achieve U-value of 0.25 W/m2K ); Application of floor insulation and loft insulation top up. (U-values of of 0.4 and 0.13 respectively) ; |
| Other relevant retrofit strategies | Doing everything in the void process along with kitchenb and bathroom refitting to minimise costs. Close open fireplace and flue Replacement windows and doors - A rated windows Energy efficient appliances Low energy light bulbs |
| 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 | 0 |
|---|---|
| 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 |