Interesting article about the passive house education center Enterprise Centre at the University of East Anglia (UEA) in Norwich in UK was published in Passive House Plus journal issue 12, 2015. Read the article here (link here). In the article you can find very interesting and detailed information about the building structure and ventilation system.
- Building type: 3,400 m2 (gross internal floor area) detached two-storey timber frame enterprise centre/ business hub
- Location: University of East Anglia Campus, Norwich
- Completion date: June 2015
- Budget: £11,600,000
- Passive house certification: pending
- Space heating demand (PHPP): 8 kWh/(m2.y)
- Heat load (PHPP): N/A
- Primary energy demand (PHPP): 115 kWh/(m2.y) (figure may improve further once the efficiency of UEA’s CHP network is incorporated)
- Environmental assessment method: Designed to Breeam Outstanding
- Airtightness (at 50 Pascals): 0.21 ACH
- Thermal bridging: Thermal bridging was modelled where glulams sat within the cassette (2 locations only). In all other areas a minimum 200mm insulation band was maintained. The following steps helped to achieve this: timber construction throughout, insulation under slab used as formwork, larsen truss zone in the timber frame to create a continuous 200 mm duvet layer, overhangs created by cantilevering glulam beams on top of the roof deck rather than in the i-joist zone, mid level bride soleil is fixed to the facade breather/ sheathing board zone via a stress plate so it does not penetrate the duvet zone, high density insulation used to form door thresholds, high density insulation used to support ground floor glazing directly.
- Ground floor: Raft foundation with 250mm slab underneath. U value: 0.128 W/(m2.K)
- Walls: Cygnum factory-built timber frame featuring, from the outside in, cladding on battens and counter battens (cladding consisting of either thatch cassettes, recycled chemistry lab tables, Medite Tricoya, Baumit lime render or reclaimed oak from local council felling, Sarket breather board. 200mm larsen truss with Warmcel insulation (blown cellulose), 140 mm structural stud zone insulated with Warmcel, 18mm OSB3 airtight layer, 50mm service cavity zone, Birch faced ply, lime render or timber slats to internal surface. U-value: 0.122 W/(m2.K)
- Roof: Cygnum factory-built timber frame with (outside to in): bituminous roof membrane, 25mm ply deck, ventilation zone, Sbreather membrane, 15mm breather sheathing, 300mm I-joist fully filled with insulation, 18mm OSB3 airtight layer, 2 x layers of 15 mm plasterboard. U-value: 0.132 W/(m2.K)
- Windows: Protec aluminium/timber composite windows. Overall U-Value of 0.77 W/(m2.K), G-value 0.49. Doors are Frame + Passive House Institute certified units with overall PHI certified Uvalue of 0.8 W/(m2.K). 6 x Fakro DEF DU6 electrically-opened flat roof windows. Triple-glazed 120 x 220 cm units, with a U-value of 0.81 W/(m2.K).
- Heating system: Custom built heat interface unit linked to UEA’s district heating and combined heat and power network
- Ventilation: 3 x rotary heat exchangePassive House Institute certified MVHR units with efficiencies ~85% using thermal wheel. Auditorium AHU also fitted with cooling coil with
condensers in exhaust air duct.
- Electricity:A 49.6 kW 480 m2 solar photovoltaic array, divided between 160 modules, predicted to generate 43.58 MWh in the first year.
- Green materials: Low carbon concrete using 70% GGBS & recycled sand, recycled sub-base from local demolition, most timber for framing sourced from local forest, local larch used for glulams, lift shaft made from cross-laminated timber, domestically sourced OSB, local straw used for thatching (and by-products used for local flour and beer production), external grade MDF for courtyard cladding, Iroko cladding from old lab desks at UEA, recycled reception desk, wood wool acoustic sound boards, sprayon cellulose acoustic finishing treatment, recycled car tyre flooring, solvent free natural-based paints and oil finishes, ecological wall coverings (including hemp, nettle fabric, earth board, reed boards), low maintenance and long life diamond-ground concrete floor (incorporating low carbon cement), upper floors finished in Marmoleum (linseed and hessian matting on recycled glass screed).