| Planned occupancy | 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 an Air source heat pump and new radiator system. Heat will be recovered from exhaust air via the use of mechanical ventilation with heat recovery unit. |
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| Water heating strategy | Hot water will be provided by high efficiency flat plate solar collectors and large capacity thermal store with an air source heat pump as a backup |
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| Fuel strategy | Electricity |
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| Renewable energy strategy | Onsite electric production by 2.1 kWp photovoltaic panels and heat production by solar thermal collectors. |
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| Passive Solar strategy | As this is a retrofit of a historic building within an area of architectural merit , options for reconfiguration of fenestration to improve passive solar gain will not be possible. |
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| Space cooling strategy | HRV with summer bypass combined with natural ventilation for summer period. 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 | Heat recovery ventilation 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 will be insulted with a thin layer of aerogel laminated chipboard to achieve a U-value of 0.47 w/m2K - The existing solid walls will be dry lined internally with a high performance aerogel laminated board to achieve a U-value |
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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 | This four-property terrace was built in 1948 to commemorate a member of a local family who fought and died in the Second World War - Hastoe Housing Association holds the properties in trust. Of the four properties, the end of terrace, single-storey 2 bedroom bungalow is currently unoccupied. The other three cottages in the terrace are occupied by elderly tenants of the housing association, who are all very concerned about heat loss, condensation and rising fuel costs as the dwellings have never been modernised. The work done on this property will form the model for low carbon refurbishment of the complete terrace as well as other schemes within Hastoes predominantly rural stock over the coming years. |
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