| 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 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 0.7 kWp photovoltaic panels and low carbon electricity production via gas fired micro CHP unit. |
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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 SAP, with the use of extension sheet produced for this competition. Dynamic simulation was used to assess the impact of our proposed micro CHP heating system with the results fed back into the SAP extension sheet. |
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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 0.54 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 carry out additional monitoring of the innovative heat saving thermal blinds. |
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| Contextual information | Cambridge Housing Society manages over 2200 homes and provides care and support services for 520 people. This project will focus on a particular housing archetype - the almshouse - and will seek to establish a complementary and replicable set of measures which significantly reduce energy use and CO2 emissions. The challenges to low carbon retrofit presented by this property typify many of the issues prevalent in this housing type: uninsulated solid wall construction, poor quality single glazing, sensitive architectural character etc. It is intended that the findings will inform the remainder of Cambridge Housing Society's historic properties and will thus be widely applicable to other social landlords or building owners with similar stock. |
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