Isos Housing Group - End Terrace Retrofit
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as PDF The proposed property, built around the turn of the century, is an end terrace with an Energy Efficiency Rating of 32. Its Environmental Impact (CO2) Rating is 27. There are 386,580 similar Victorian properties in the North East alone, allowing for great replicability potential (source: Compendium of North East England Housing & Population Data, North East Regional Information Partnership, www.nerip.com). The aim of the project from the outset was to balance carbon reductions with cost effectiveness, and provide exemplar pioneering solutions with high levels of comfort. The project team wished to use technologies sourced locally as far as possible and use the local labour force for installation and maintenance.
Retrofit for the future ZA213Y
Isos Housing Group - End Terrace Retrofit : 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 | 980 kWh/yr | 1974 kWh/yr | - |
|---|---|---|---|
| Natural gas use | 27559 kWh/yr | 1033 kWh/yr | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | 485 kWh/m².yr | 87 kWh/m².yr | - |
|---|---|---|---|
| Annual CO₂ emissions | 89 kg CO₂/m².yr | 20 kg CO₂/m².yr | - |
| Annual space heat demand | - | 42.3 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Solar Photovoltaic | 598 kWh/yr | - |
| 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 | 15 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 | We aim to reduce energy consumption further than predicted by the use of addional technologies that cannot be modelled e.g. 1. The use of voltage regulators predicted to give 15-20% savings on electricity. 2. The use of energy readouts within the property |
| Forecast heating load | - |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | 11.64m³/m².hr @ 50 Pascals |
|---|---|---|
| Final air permeability test | - | 11.83m³/m².hr @ 50 Pascals |
Project description
| Stage | Under construction |
|---|---|
| Start date | 01 July 2010 |
| Occupation date | 01 October 2010 |
| Location | North Shields England |
| Build type | Refurbishment |
| Building sector | Public Residential |
| Property type | End Terrace |
| Construction type | Solid Brick |
| Other construction type | Approx 300mm thick |
| Party wall construction | Approx 250mm solid brick |
| Floor area | 70.4 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |
Project Team
| Organisation | Isos Housing Group |
|---|---|
| Project lead person | Isos Housing Group |
| Landlord or Client | NomadE5 Housing Association (Isos Housing Group is the parent company) |
| Architect | |
| Mechanical & electrical consultant | Envirohomes Limited |
| Energy consultant | Envirohomes Limited / Northumbria University |
| Structural engineer | |
| Quantity surveyor | |
| Consultant | Northumbria University / North Energy Associates Limited |
| Contractor |
Design strategies
| Planned occupancy | One female adult and one minor, generally in the property most of the time. |
|---|---|
| Space heating strategy | Heating from siamesed exhaust air heat pump and combi-gas boiler. Distribution system by radiators. Heat pump will take the vast majority of the heating load supplimented by the gas boiler in exceptional circumstances. Heat recovered from exhausted air from property. |
| Water heating strategy | Solar water heating to suppliment combi-gas boiler. No back up resitance heating. |
| Fuel strategy | Mains gas for hot water. Mains electricity utilising off peak electricity for space heating by exhaust air heat pump. |
| Renewable energy strategy | 1.0 kWp photovoltaic panel array to be installed on the roof of the dwelling + 4m2 solar thermal panels. |
| Passive Solar strategy | Property within 45 degrees south. Plan to keep the larger southerly facing windows. |
| Space cooling strategy | Natural ventilation using windows used for majority of time. To be assisted by exhaust air heat pump when required. This will be also used at night in exceptional cases. |
| Daylighting strategy | To maintain the current daylight factor of all the rooms within the building. This means all rooms in the band of 2-5% daylight factor. |
| Ventilation strategy | Windows to remain opening for summer ventilation. Winter ventilation by exhaust air heat pump. |
| Airtightness strategy | Airtightness membrane to internal face of exterior walls. All internal walls and ceilings parged to assist with airtightness and give a continuous barrier. |
| Strategy for minimising thermal bridges | Use of continuous insulation throughout the property. Application of best practice for tackling thermal bridging e.g. by Energy Saving Trust - Robust Details etc. Geometric thermal bridges kept to a minimum. |
| Modelling strategy | Use of accredited SAP2005 software with whole house SAP extension sheet version 1.6 from TSB web site. |
| Insulation strategy | Application of internal insulation to walls using nanopore technology - target U-value 0.25W/m2K. Replacement of solid floor with insulated solid floor using vacuum insulation panels - target U-value 0.17 W/m2K. Remove existing poor mineral fibre and replace with EnergyFlo Dynamic insulation - target U-value 0.08 W/m2K (however this system can easily attain 0.05W/m2K with no physical change to components). |
| Other relevant retrofit strategies | We wish to look at the use of off peak electricity and the use of the siamesed heat pump to heat the property. The high thermal mass of the property and the exceptional insulation will keep it warm through the day. If in exceptional periods, extra heat in the day is required, this will be supplimented with the gas boiler. This will reduce heating bills further than using a conventional heat pump or gas boiler which is beneficial to the tenants. |
| Contextual information | The property is located in the Riverside ward which ranks among the most deprived 5% in the country. Whilst gas is available, which is the cheapest form of heating, the design of the dwelling means it is considerably less efficient than more modern house types. It is one of 74 houses and 19 flats of similar build, owned by Isos Housing Group, in the immediate vicinity. This type of buliding is common across the UK, particularly across the North East. The property is a solid walled brick end of terrace. Because of this it was decided to internally insulate the building. Due to limited space exteranlly and interanlly and new to the market technology, the chosen heating system is a siamesed air heat pump and A-rated combi-gas boiler |
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 |