Retrofitting a post Decent Home/Scottish Housing Quality Standard, concrete no-fines property to reach one-eighth of the existing energy use and carbon emissions.
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as PDF Low energy and low carbon retrofitting of a two- bed end-terraced house in Rosyth, Scotland originally built in 1970 s to achieve 85% reductions in carbon emissions. The project s objective is to firstly halve the demand of energy use using passive design and fabric-related energy efficiency measures, then double the efficiency by installing efficient equipment and controls, and finally halve the carbon content of supplies using nominal level of well proven zero carbon technologies, to reach 1/8th of the existing emissions.
Retrofit for the future ZA303S
Retrofitting a post Decent Home/Scottish Housing Quality Standard, concrete no-fines property to reach one-eighth of the existing energy use and carbon emissions. : 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 | 904.8 kWh/yr | 904.85 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 22834.5 kWh/yr | 3566.63 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 368 kWh/m².yr | 82 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 68 kg CO₂/m².yr | 16 kg CO₂/m².yr | - |
| Annual space heat demand | - | 21.49 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| 1 kWp photovoltaic panel array | 833.5999756 kWh/yr | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | 55 kWh/m².yr | - |
| Annual CO₂ emissions offset by renewable generation | 10 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 | - | 13.36m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | - |
Project description
| Stage | Under construction |
|---|---|
| Start date | |
| Occupation date | |
| Location | Rosyth Scotland |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | End Terrace |
| Construction type | Other |
| Other construction type | 210mm Cast in Situ concrete no fines wall , no insulation |
| Party wall construction | 210mm Cast in Situ concrete no fines wall construction |
| Floor area | 77.4 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Home in Scotland |
|---|---|
| Project lead person | |
| Landlord or Client | |
| Architect | |
| Mechanical & electrical consultant | |
| Energy consultant | |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | 2 occupants, one of them spends most of the weekdays and weekend days in the house. |
|---|---|
| Space heating strategy | Heating from mains gas. High efficiency condensing boiler feeding radiators |
| Water heating strategy | Solar hot water, with high efficiency gas condensing boiler back up. |
| Fuel strategy | Mains gas and mains electricity |
| Renewable energy strategy | South-oriented 1 kWp photovoltaic panel array to be installed |
| Passive Solar strategy | Solar gains from south facing windows. Efficient building fabric to minimise heat loss. |
| Space cooling strategy | Naturally ventilated house, SAP assessment shows overheating risk 'not significant'. |
| Daylighting strategy | Window sizes and positioning provide good levels of daylighting throughout the house. Kitchen, living room and dining room achieve a minimum average daylight factor of at least 2%. |
| Ventilation strategy | Natural ventilation through manually openable windows , passive stack ventilation for wet areas. |
| Airtightness strategy | Air - permeability of 3m3/hm2 @ 50 Pa is targeted, highest recommended level for naturally ventilated buildings. Upgradation of windows and doors, minimising thermal bridges and insulating and sealing all air leakage pathways identified in the air pressure test will ensure an airtight fabric is achieved. |
| Strategy for minimising thermal bridges | Using accredited construction details, by detailing for continuous insulation and air barrier on external walls to prevent condensation. Party wall insulation to minimise the thermal bridge between the party wall (back and front) and external wall, and to reduce heat losses to the neighbouring property. |
| Modelling strategy | SAP 2005 was used as the primary modelling tool. All SAP calculations were carried out in the approved SAP 2005 software SAPCalc. A PHPP analysis was also carried out for verifying the final package of measures. |
| Insulation strategy | The concrete no-fines wall will be insulated externally with vacuum insulation panels (VIP) to provide a U-value of 0.17W/m2K. The party wall will be thermally and acoustically insulated to avoid heat loss to the neighbouring property and to reduce noise related issues identified in the occupant survey. The existing pitched roof will be insulated with 250mm of polyurethane to achieve a U-value of 0.1W/m2K. The concrete ground floor slab will be insulated with vacuum insulation panels to minimise increasing the overall thickness of the floor, while still achieving a U-value of 0.2W/m2K. |
| Other relevant retrofit strategies | |
| Contextual information | A pre-retrofit occupant feedback survey was carried out during Phase 1, to understand the impact of occupant behaviour on energy use. The tenants co-operated enthusiastically and completed a questionnaire survey (both residents) and open-ended interview, which helped us in understanding their satisfaction levels, perception of comfort and control, and their aspirations in the retrofitting project. The tenants also completed logging sheets for thermal comfort and related activities. This survey underpinned the proposed strategies for the 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 |