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This table gives some detailed information on the buildings illustrated in the powerpoint - Sustainable buildings - 5 examples * Thermal transmittance, also known as U value, is the rate of transfer of heat (in watts) through one square metre of a structure divided by the difference in temperature across the structure. It is expressed in watts per square metre per kelvin, or W/m²K. The lower the U value figure the better the performance in keeping heat in. Feature St Lukes WISE U value roof (Unit is W/m2K)* U value walls U value floor Thermal mass 0.09 0.09 lecture theatre 0.09 terrace 0.14 North 0.11 South 0.12 0.12 0.14 0.16 Type of window Triple glazing in timber frame Some double glazed doors Coloured film on clerestory glazing for aesthetic effect. U value = 1.1 High performance double glazing: Soft low-e coating, argon fill and insulated edge spacers in FSC redwood/oak frames. U value = 1.1 to 1.4 Materials general All timber or tree products lino and rubber flooring, recycled carpet matting from car tyres natural organic paints and oils Cedar shingles Local, low embodied energy natural organic paints and oils. Slate from CAT site and Blaenau. Where possible, indigenous materials and labour have been used Responsible Sourcing and the Green Guide Various, including 0.5mm stainless steel Hemp/lime, Warmcel, perlite and cork Internal - rammed Earth and earth blocks, External- 500mm hemp/lime cast around timber frame Aluminium Sedum roof to north and reused slate and PVs to South High level warmcel Material roof Material insulation Material walls Senedd Canolfan Hyddgen WAG Aberystwyth 012 High thermal mass with earth walls (rammed and pre-made blocks) Recycled cellulose High levels UK grown Douglas Fir cladding Timber frame – glulam in larger spaces In-filled with Pre-fabricated Exposed concrete slabs utilised for their thermal mass Extensive use of slate Concrete floors and blockwork internal walls Recycled masonry core Triple low emissivity glazing in super insulated frames Mainly slate and glass Yes In structural soffits Timber timber panels Douglas Fir, glulam Cement Glulam and solid, all FSC Oak, cedar, larch, ash, whitewood From Wales and Scandinavia Very little, mostly lime Daylighting Maximised North facing clerestory windows Maximised Skylights, lots of windows, various sizes Lighting Energy efficient – automatically adjust to ambient light Passive Classrooms cross-ventilated – manual low level windows and automatic clerestory Natural wind flow LED and fluorescents, some automatic controls Passive solar Carefully controlled. Large canopy along South facing classrooms provides extended tchg space and shade from summer sun Glazing to south face of corridor around Earth wall lecture theatre. Bedrooms face south. Siting Open site Not ideal for solar Ventilation Solar water heating no Water heating Natural, stack, controlled Mechanical ventilation kept to a minimum No air conditioning External solid timber frame – local and FSC Concrete slabs utilised for their thermal mass Concrete floors and blockwork internal walls The funnel, wind cowl and lantern are key to ventilation and lighting in the Siambr A lot Lack of glare on computer screens etc. natural ventilation The Siambr, Committee Rooms and associated public viewing galleries are serviced by a mixed-mode ventilation system, which offers both natural ventilation and airconditioning Lighting controls T5 fluorescent tubes Daylight dimming Mechanical cooling “stack” ventilation via the atrium mechanical vents at ground level Lots of south facing glazing – great for solar gain in the winter – 1/3 of heat demand Brises-soleil added Access corridor between south glazing and most teaching rooms Mid-wales is mild but solar gain is lower than many areas of Britain Unshaded south orientation 70m2 evacuated tubes to provide much of the hot water for the ensuite study bedrooms Point of use instant gas Southerly orientation yes Heating system PVs Underfloor Biomass woodchip Gas back-up no 100kW (electrical) wood chip combined-heat-and-power plant back-up gas underfloor heating earth heat exchangers, coupled with heat pumps The boiler installed has the ability to process both wood chip and pellets. 60m2, 6.58KW peak 7kWp Generate 5987kWj/y – ¼ of the building’s electricity use Intend to add 20kW Wind turbine Monitoring Feedback Simple cartoon guides of how things work in every room Minute by minute monitoring and feedback of energy and water consumption Thorough consultation before with parents, teachers, children and governors Head says ‘Children and staff are keen to work; they love their new learning envir Pupil – ‘a happy building that smiles at you’ Water use Size / function Location visual etc Detailed record of construction, energy and water in use. Electricity and heat energy use Monitored and can be controlled from County Hall Extremely positive from all users. Centre administrator says stays cool on hot days in the summer She explains to users how the building works The building was warm enough through Wales’ coldest winter for 30 years Low flow taps and toilet systems. 438 pupil primary school 2911m2 Efficient heat recovery system 85% reduction in space heating Gas Subsoil pre-heat pipes 200 seat lecture theatre, 4 teaching rooms, 3 seminar rooms, bar, 24 bedrooms, restaurant extension office space for 20, roof terraces Visual impact reduced by being tucked partly into the slate tip at CAT. Rain water harvesting. Water is collected primary supply for flushing the WCs, irrigation and maintenance. (& water saving devices) Waterless urinals and low flush loos and leak detection 410m2 4 training rooms, day and evening classes inc computing, receptn for the Sch, front of hse cncl servs, free int access + Important Key location facing Cardiff Bay District biomass system Yes Also policy to buy green electricity Rainwater harvesting Water efficient fittings ecology Community /public Cost Breeam Sustainable Urban drainage systems Maximum number of trees retained on the site Community use in the evening and weekends for courses and other Permeable paving bat rehab sedum Open to day visitors to site whenever possible Symbolises an open democracy and public accessibility BREEAM excellent Principles – Sustainable materials Community involvement Using building as a curriculum resource Predicted CO2 emissions of 8.8kg/m2/y St Lukes WISE Senedd Faithful and Gould’s benchmark for educational buildings is £1711/m2 Council office Evening classes and meetings £1784/m2 BREEAM excellent 1st public sector building certified by the Passivhaus Institute Annual primary energy use of 112kWh/m2/yr – below passivhaus target Shut everything down at night with mechanical timers Annual heating bill £127 Can H WAG Aber