| Planned occupancy | The planned occupancy will be a small family 3-4 people in full-part time work with children in school on weekdays |
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| Space heating strategy | The Space heating will provided by an Air to water heat pump, boosting a thermal store. This will be delivered via a wet system underfloor/radiant heating.The Solar Wall will provide warm air as a feedstock to the Heat pump raising the COP. M Fully controlled ventilation in the form of Mechanical ventilation with Heat recovery, will be used to provide a comfortable living environment. |
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| Water heating strategy | SolarWall to thermal store, Air to water heat pump (COP of 3) providing hot water delivered via underfloor heating system |
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| Fuel strategy | Dwelling is switching to mains electricity. It will be interesting to see the effects of space heating and domestic hot water heating via electricty as the primary fuel. |
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| Renewable energy strategy | 1.52KW P.V array circa 8 m2. microgeneration in the form of Photo voltaic panels. This has been used in the appropiarte context. i.e property faces south. |
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| Passive Solar strategy | Property is on a east/west axis. living rooms is orientated to the south. Window proportions have been size for maxium daylight and passive solar gains. Shading stratergy has been considered to prevent summer overheating risk. Optimised using PHPP. |
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| Space cooling strategy | As the passivhaus standard is being implemented, the high levels of insulation and excellent air tightness levels will help to moderate the heat gains into the building during summer. Controlled ventilation will be used during the night time, increasing the air flow rates at the coldest periods. This will be used in conjunction conventional with shading systems. e.g Roller blinds, overhangs etc. reduce excessive solar gains Night purging maybe required during heat waves. Existing thermal mass from the existing precast concrete frame will also help moderate summer heat fluctuations |
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| Daylighting strategy | All kitchens achieve a minimum average daylight factor of at least 2% All living rooms, dining rooms and studies achieve average daylight factor of at least 1.5% In line with the legislative requirements of the Welsh housing quality standard and design quality requirements for Wales |
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| Ventilation strategy | Comfort ventilation will be provided by the MVHR unit. In conjunction with the passivhaus approach (i.e Super insulation, and excellent air tightness. ) this will provide a pleasant internal environment. With regular filter exchange and maintenance to the MVHR unit, heating can be supply by air. This can also help to regulate the fresh air intake and alleviate respiratory illnesses. |
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| Airtightness strategy | Airtight membrane over roof structure sealed to outside face of Inner OSB SIPS. Internal Plasterboard walls parged to provide continuous air barrier with membrane. Suspended floor air barrier sealed direct to masonry wall. Party wall will have a parging coat to ensure air tightness and mitigate thermal bypass. Air tightness membranes and tapes: Air tightness products will be used were necessary using high performance tapes and 'intelligent' vapour checks can help buildings achieve the high levels of air tightness required for Passivhaus buildings, as well as protecting building structures from condensation, mould, rot and damp. |
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| Strategy for minimising thermal bridges | Thermal bridging analysis undertaken for all primary junctions interfaces (in order to assist with value engineering.) 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. |
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| Modelling strategy | Whole house modelling was undertaken using SAP+extenstion sheet. Phase contact would use PHPP throught the entire design process. Dynamic simulation may also be used to assess the impact of the proposed solar-wall combined with the heat pump heating system. |
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| Insulation strategy | Continuous insulation in the form of SIPS the precast concrete frame over, improves energy efficiency by diminishing the negative effect of thermal bridging. The excellent moisture resistance of OSB intergrated into the SIPS coupled with sealed joints also serves as an air and moisture barrier. |
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| Other relevant retrofit strategies | The property is currently void an therefore disruption to tenants will not be a problem for this project. However as some components are prefabricated off site this could help save time on-site and cause less disruption to tenants. |
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| Contextual information | |
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