Engert, Scheriau, Wimmer SS 2010 Energy and sustainable development, Prof. Schleicher

 Empirical study for an office building ◦ Building, actual state analysis, proposals for improvement  Energy efficient example of an office building  Proposals before building an office building

 6 Floors - 5, m 2  97 offices + 3 common rooms  31 aluminium shop windows with thermal glazing  147 wooden windows with thermal glazing  no Insulation  Electricity consumption: kWh  Cooling system: fan coil units  Heating system: District heating - 508,008 kWh  Water consumption: m 3

 Heating  Cooling  Electricity  Water use

Oil heating Gas heating natural gas Pellet- fuelled heating District heating Heat pump Wood chips heating Renewability ––+ // + Heating comfort / Required space/ + / ++– Regional value added// + // + Local environmental effects/ + / ++– Climate effects ––++ / + Shelf life +–+––+ Market development / trend – / ++++

① Plasterboard ② Battens/dry lining ③ Vapour barrier ④ Adhesive tape with lathwork ⑤ Interior insulation between wooden battens ⑥ Previous interior plaster ⑦ Masonry ⑧ External plaster

 Central air conditioning  Decentral air conditioning

 Fan coil units

 max. 3-5⁰ C less than outdoor temperature  windows closed  sun shades  fluorescent lamps and tubes, energy saving lamps and flat screens  plants  insulation  revolving door

Energy saving installations  Power strips, socket switcher, power safer boxes, timer and motion sensors Lightning  Energy saving bulbs and motion sensors  Change of user behaviour

 water reduction in office kitchen and toilets  leaking taps  tap aerators  toilets with dual-flush  water efficient dishwasher

in Floridsdorf, Vienna

 Office building in passivehouse standard  Size: m 2 for 200 offices and 300 jobs  Costs: about 14 million €  Construction time: june 2007 to july 2008

 Certified passive house standard: ◦ Insulation of 31 cm ◦ Triple glazing ◦ Ventilation with heat recovery ◦ 80 % less energy consumption for cooling, heating, ventilation and lightning ◦ Savings per year: € ◦ CO 2 -reduction: 180 tons per year

 Heating and Cooling ◦ Through building component activation ◦ Groundwater provides energy to temper the building ◦ Solarcooling

 Use of renewable ressources: ◦ Solar energy: 400 m 2 pv facility: kWh per year for electricity and 300 m 2 solar thermal facility ◦ geothermics for heating and cooling ◦ hydro power to cover further energy demand

 Additional facts: ◦ Special sun blinds for light regulation ◦ 65 % saving for lightning ◦ 500 plants as green puffer zone ◦ Groundwater for toiletts ◦ Light-weight wood construction ◦ No air condition and radiators

 Energy-efficient technologies  Location (trees, landscaping, and hills can provide shade and block wind)  South facing windows increases the amount of sun, entering the building, minimizing energy use, by maximizing passive solar heating  Tight building design (insulation), including energy-efficient windows, well-sealed doors, and additional thermal insulation of walls, basement slabs and foundation (reduce heat by 25 to 50%)

 Lightly colored roofs (energy reduction about 40 percent for cooling than buildings with darker roofs)  Proper placement of windows and skylights and use of architectural features that reflect light into a building (reduce need for artificial lightning)  Compact fluorescent lights  Water efficient products and appliances (toilets with dual flush, water efficient taps)

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Thank you for your attention!