| BUILDING PERFORMANCE CHAMPION The lecture theatre is also mechanically ventilated using an air handling unit (AHU). Because the theatre is a freestanding box in the centre of the concrete floor of the main shed, fresh air is delivered to the unit through underfloor ductwork. The recirculated air is warmed or cooled by the AHU and delivered to the space through grilles positioned beneath the raked seating. There is a return air path from the main shed back to the single-pass AHU, says Thomas. Vitiated air simply rises up and out of the room and into the main shed through acoustically treated openings in the theatres roof. The lecture theatre is the only space in the building to have warm-air heating; the remainder of the spaces are heated by an underfloor system. We did option appraisals on the energy source to heat the building and there was a definite rationale for going for underfloor heating, says Thomas. The system strengthened the argument to use heat pumps and it satisfied the requirement for internal architectural cleanness. A ground source heat pump (GSHP) is used. Heat is supplied by three, 180m-deep boreholes located outside the footprint of the building (see panel, Ground up approach, on page 36). The building opened in July 2017, and the sustainability matrix included detailed energy management measures to help ensure the completed building performs in line with the designers intention. Measures include the requirement Overview of the buildings spaces and environmental strategy Environmental strategy AWARDS Natural ventilation. Underfloor heating and cooling Mechanical supply and extract ventilation. Underfloor heating and cooling Mechanical ventilation with heating and cooling. Air supplied from raked seating. No underfloor heating Mechanical ventilation via grilles at high level and natural ventilation openings. Underfloor heating. Cooling provided by individual fan coil units Natural ventilation via wall panel, plus underfloor heating and cooling Natural ventilation via wall panel, plus underfloor heating. Cooling provided by individual fan coil units Cooling via fan unit located within space Underfloor heating manifold No Nogas gassupply? supply? Strict StrictNO NO targets? x xtargets? Awkward Awkwardflue fluerun? run? E-Tech willwill solve your problems E-Tech solve your problems Electric boilers from ACV UK UK Electric boilers from ACV Commercial and domestic Commercial and domestic Floor standing and wall hung Floor standing and wall hung Single Single phase and three phase andphase three phase Heating and hotand water Heating hot water 9kW - 259kW 9kW - 259kW ForFor more information visit www.acv.com more information visit www.acv.com 34 March 2020 www.cibsejournal.com CIBSE Mar20 pp32-36 Engine shed.indd 34 21/02/2020 14:52