Devizes - Whole house refurbishment of an off-gas 1930s 3-bed semi with advanced levels of energy efficiency, supplemented by an innovative air source heat pump
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as PDF The objective of this project is to undertake the advanced, whole house refurbishment of an off-gas rural property to a high standard of energy efficiency, supplemented by the new Daikin Altherma air source heat pump. We confirm that the proposed retrofit is for a social housing property. The proposed works will enable us to test and develop a template package of improvements applicable to our void properties before they are re-let. The selected property is electrically heated resulting in high energy bills, high CO2 emissions and restricted comfort and utility for tenants. This project will also dedicate resources to educating future occupiers and staff at Sarsen to promote more sustainable lifestyles.
Retrofit for the future ZA429H
Devizes - Whole house refurbishment of an off-gas 1930s 3-bed semi with advanced levels of energy efficiency, supplemented by an innovative air source heat pump : 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 | 16113 kWh/yr | 2000 kWh/yr | - |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| house coal | 3439 kWh/yr | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 579 kWh/m².yr | 66 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 143 kg CO₂/m².yr | 16 kg CO₂/m².yr | - |
| Annual space heat demand | - | 77 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 | 66 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 16 kg CO₂/m².yr | - |
Calculation and targets
| Whole house energy calculation method | SAP |
|---|---|
| Other whole house calculation method | Figures relate to SAP extension values, for consistent approach to TSB. But have also used Home Energy Masterplan software dev |
| Energy target | Retrofit for the Future |
| Other energy targets | Using the SAP extension worksheet, the Primary Energy Demand= 110kWh/m2/yr, CO2 Target Range = 16Kg/m2/yr. Figures for Fuel Use forecast below has been edited from SAP extension worksheet to take account of SAP 2009 carbon factors being used. |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 12.63m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 6.35m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 March 2010 |
| Occupation date | 01 June 2010 |
| Location | Devizes Wiltshire England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | Semi-Detached |
| Construction type | Masonry Cavity |
| Other construction type | Filled cavity |
| Party wall construction | Filled cavity |
| Floor area | 75.87 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Sarsen Housing Association |
|---|---|
| Project lead person | Sarsen Housing Association |
| Landlord or Client | Sarsen Housing Association |
| Architect | Sarsen Housing Association |
| Mechanical & electrical consultant | Space Air |
| Energy consultant | Camco |
| Structural engineer | - |
| Quantity surveyor | - |
| Consultant | Parity Projects, A Proctor Group |
| Contractor | Sarsen Housing Association |
Design strategies
| Planned occupancy | Family of four - living low energy sustainable lifestyles |
|---|---|
| Space heating strategy | Latest Daikin Altherma Air Source Heat Pump, with underfloor heating and new Daikin Heat Pump Convectors for the first floor. |
| Water heating strategy | Latest Daikin Altherma Air Source Heat Pump will be able to deliver all hot water needs. |
| Fuel strategy | Mains electricity |
| Renewable energy strategy | Air Source Heat Pump (low carbon technology) |
| Passive Solar strategy | New A rated windows, no new openings planned. |
| Space cooling strategy | Natural ventilation |
| Daylighting strategy | Adequate daylight factor |
| Ventilation strategy | Openable windows, Heat recovery ventilators for the bathroom and kitchen. |
| Airtightness strategy | Adavanced draught proofing measures and tightly fitting all new windows and doors. |
| Strategy for minimising thermal bridges | Thermal bridging will be minimised by ensuring a continuous insulation maintained throughout propoertry. Achieved through correct and detailed upgrade of the thermal envelope. |
| Modelling strategy | House modelling was undertaken in using SAP software and whole house calculation. -Also used Home Energy Masterplan software developed by Parity projects. This uses data about building characteristics, resident behaviour and specific appliance use to derive an accurate estimate of the annual energy of the dwelling. The calculation methodology is based on BREDEM8, but uses with supplementary information from sources including CIBSE Guide A to cover aspects such as floor heat losses and appliances. |
| Insulation strategy | All areas of the thermal envelope will be upgraded. Adding internal wall insulation (u-value 0.25W/m2K). The unique high performance aerogel insulation (with a K factor of 0.013W/mK) used in Spacetherm F, combined with the robustness and durability of Fermacell gypsum board, delivers world class thermal conductivity and long term performance. - Top up of loft insulation to 300mm (u-value 0.15) - Insulation of suspended floors and solid floors (u-value 0.25) = Confirmed by suppliers |
| Other relevant retrofit strategies | This project will also dedicate resources to educating future occupiers and staff at Sarsen to promote more 'sustainable' lifestyles. To promote holistic sustainable living, we will also provide measures to reduce energy use and emissions associated with food and transport, such as an unheated greenhouse, allotment space, and bicycle storage. We aim to minimise waste by providing recycling storage bins and a composter. To ensure all these measures are used appropriately, we will be engaging tenants through user guides, workshops, presentations and consultations: this will help raise awareness and motivate the occupiers to realise the benefits of living a sustainable lifestyle. |
| 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 |