| Planned occupancy | Though currently void, it is possible that the property will be occupied during the works. The knocking-through of the two properties creates a spacious 4-bedroom house likely to be occupied by a family of six to seven people, including a potential four children going to school and two or three adults, at least one of which may be inactive and in the property for large parts of every day. |
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| Space heating strategy | Gas Micro-CHP (combined heat and power) unit to supply space heating following electricity generation. |
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| Water heating strategy | Gas Micro-CHP (combined heat and power) unit for hot water supply boosted by 5 square metres of rooftop solar thermal panels. |
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| Fuel strategy | Dual fuel solution. Gas fired low carbon Micro-CHP + supplementary electricity supply. |
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| Renewable energy strategy | Whilst not renewable, the micro-CHP unit generates electricity and the roof mounted solar thermal panels reduce the overall CHP demand, i.e. to balance electrical and heating demand. |
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| Passive Solar strategy | Existing window sizes and positions are to be retained, although new windows are proposed. The knock-through includes the removal of unauthorised building extension work. This will enable increased solar access to living areas and kitchen. |
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| Space cooling strategy | Mixed mode via natural ventilation from openable windows and free cooling from the MVHR system. |
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| Daylighting strategy | Existing window sizes and positions are to be retained, although sun-pipes are proposed to bring better daylight into landing areas. The knock-through includes the removal of unauthorised building extension work. This will enable increased solar access to living areas and kitchen, increasing average daylight factors overall. |
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| Ventilation strategy | Mixed mode via natural ventilation from openable windows and high efficiency MVHR system to extract from bathrooms, kitchen and toilets. |
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| Airtightness strategy | Significant improvement, targetting best practice standards of 3. An 'Airtightness Champion' will coordinate between consultants and trade sub-contractors on site. Laps in membranes to be rigorously sealed. Gaps around window/door frames to be sealed. All windows and external doors to be draughtstripped. Holes around services passing through the external wall to be sealed.Holes around service pipes and sun pipes passing through suspended timber floors, around light fittings and pull cords in the ceiling to be sealed. Joints between the ceiling and the external wall to be sealed. Joints between drylining and skirting board to be sealed. Suspended floor air barrier to front and side of property to be sealed to flank wall. |
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| Strategy for minimising thermal bridges | Returns in all internal insulation to match reveals as part of continuous insulation. All major elements junctions considered. Doors and secondary glazing in particular specified to reduce thermal bridging through frames and fittings. |
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| Modelling strategy | Whole house dynamic modelling was undertaken in an iterative manner using ies ve software, SAP 2005 9.81 + SAP extension - see energy forecast below. ies ve software used with SAP interface (SAP2005 9.81 via JPA Designer vr 4.04b1 build 002). |
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| Insulation strategy | Targeting best practice standards, therefore application of internal superinsulation to solid walls (to achieve U-value of 0.2 W/m2K); high performance windows (to achieve U-value of 0.9 W/m2K). Extensive upgrades also include new doors (to achieve U-value of 0.9 W/m2K). Existing suspended floor insulated (to achieve U-value of 0.171 W/m2K); roof insulation between and under existing rafters in addition to joist level to create warm roof (to achieve U-value of 0.163 W/m2K). |
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| Other relevant retrofit strategies | Low energy lights, appliances, cooking and water-saving devices are also going to be supplied and installed. Despite property being currently void, much of the retrofit can be undertaken with tenants in situ (external wall insulation, installation of micro-CHP etc.). Additional data logging devices proposed to provide enhanced monitoring feedback to exceed TSB base specification. |
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| Contextual information | Whilst the buildings are currently in an area with a particularly recognisable aesthetic that the team wished to maintain, it was necessary to consider how the envelope could be improved to reduce space heating demand and create comfort indoors.The knock-through of the properties allowed for some space to be given to internal insulation allowing the elevations to remain intact, though upgraded with re-pointing etc.. |
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