| Planned occupancy | The property is currently void, but suitable new tenants will be found who buy into the monitoring strategy. They will be fully briefed on their new home and given a simple home information pack to explain the various technologies and controls along with local community facilities, recycling centers and public transport. |
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| Space heating strategy | Heating will be provided by mains gas via a micro CHP unit and new radiators. Heat will be recovered from exhaust air via the use of mechanical ventilation with high efficiency heat recovery unit. |
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| Water heating strategy | Hot water will be provided by mains gas via a micro CHP unit and new hot water cylinder |
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| Fuel strategy | Mains Gas, Mains electricity |
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| Renewable energy strategy | Onsite electric production by 1 kWp photovoltaic slates and low carbon electricity production via gas fired micro CHP unit. |
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| Passive Solar strategy | As this is a retrofit within a conservation area, options for reconfiguration of fenestration to improve passive solar gain will not be possible. |
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| Space cooling strategy | Sub soil heat exchanger combined with HRV unit to regulate intake air temperature. Daytime use of HRV with summer bypass and night purging during heat waves. |
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| Daylighting strategy | As this is a retrofit of a historic building within an area of architectural merit , options for reconfiguration of fenestration to improve daylight levels will not be possible. |
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| Ventilation strategy | Sub soil heat exchanger combined with a heat recovery ventilatiounit to regulate intake air temperature and additional natural ventilation by opening windows during summer months as required. |
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| Airtightness strategy | All existing vents and chimneys blocked up. New air barrier created by OSB board at ceiling level with taped joints and perimeters taped to masonry walls and plastered over. Service void created bellow this to eliminated penetrations. Windows, floors, junctions and all penetrations sealed with proprietary air tight tapes, membranes and grommets. All voids such as cavities filled to mitigate thermal bypass. |
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| Strategy for minimising thermal bridges | Continuous insulation maintained throughout. Geometric thermal bridges minimised. Junctions assessed include: Ground floor junction, external corner, party wall, party roof, party floor, eaves, verge, window jamb, head and sill, door jamb, head and threshold. Internal insulation has been returned on party walls. |
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| Modelling strategy | Whole house modeling was undertaken in both PHPP and SAP, with the use of extension sheets for both. The results provided for existing energy usage were calculated in SAP, as this software is more suitable for modeling poor performing buildings. The proposed results were modeled in PHPP as this software is more accurate for predicating energy usage in high performing buildings. Dynamic simulation was used to assess the impact of our proposed micro CHP heating system with the results fed back into PHPP/SAP. |
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| Insulation strategy | - The existing solid floor extesnon will be insulted with a thin layer of aerogel laminated chipboard to achieve a U-value of 0.48 w/m2K - The main existing suspended floor will be removed and replaced with a carbon enriched expanded polystyrene system p |
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| Other relevant retrofit strategies | We propose to fit an intelligent heating controller designed to save energy and improve comfort in residential buildings. The system controls both central and water heating, reducing energy consumption by automatically monitoring and learning occupant behavior and preferences. It also provides an easy to use and simply user interface as well as covering all energy monitoring requirements. We also propose to undertake additional monitoring of Total VOC levels. This will happen before and after retrofit, before and after the commissioning of HRV system, and in rooms with different paint specifications. The results will help educate on the affects of retrofit on indoor air quality. |
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| Contextual information | With the Government targets of 80% carbon reduction for the UK and an aspiration for emissions from domestic buildings to go beyond this, the tension that currently exists between addressing the energy efficiency of existing stock and Conservation Area planning regulations is something that needs to be resolved. There are 9080 such Conservation Areas in England alone so it is anticipated and intended that our approach to this retrofit project would be widely applicable to properties of a similar status. The project team will work closely with Westminster Council planning department to ensure that the package of measures used works within the rules in place to protect the special character of the area. |
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