OLYMPICS CASE STUDY AQUATICS CENTRE
Line of north roof supports
Line of south roof supports
Training pool
Filtration plant room
Competition pool
Dive tank
The low-velocity warm air supply louvres
provide comfortable conditions in the pool surrounds, while the self-balanced, low-level air extraction service limits the build-up and spread of moisture and pollutants. As this is dedicated to the pool surround, the total air change over the pool hall volume is only approximately one air change per hour. The air is supplied at the required space temperature, typically at 30C so buoyancy is reduced. Heating is provided by other systems.
Heating The poolside area has underfloor heating. This provides comfort for the swimmers and radiant heat to offset the radiant losses to surrounding surfaces. The system also provides a hidden function that, by warming the low- velocity supply air, encourages upwards air flow, thereby reducing the risk of air recirculation by the pool surround air extraction.
Spectator environment Spectators will typically require different comfort conditions to those at the warm poolside, and so are provided with separate ventilation that is only required when events are running. A dedicated spectator ventilation system provides conditioned heated or cooled fresh air to underseat grilles for the 2,500 spectators in the seating areas. This system consists of perforated plate grilles at each seat location supplying slightly cooler air down to 26C at low velocity. Air is extracted
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Above: The 4,200 sq m main pool hall is enclosed under a 120m long span roof with two temporary spectator stands on each side of the pool hall
Relationship between glazed façade u-value to the overall averaged u-value
15% improvement than Part-L
Part-L standard Overall averaged u-value
Below: Façade integrated heating system schematic Above: U-value comparison
Sensors to monitor condensation risk
Façade heating Heat loss from the façades is treated separately by the use of natural convectors fed from the heating hot water system. Along the perimeter there is a trench heater system to offset heat losses, and limit condensation build up. On the taller façade elements, the mullions and transoms have integrated hot water pipes embedded to reduce the risk of condensation and limit downdraughts. Each curtain wall is fed by a dedicated variable temperature circuit that is weather compensation control. The façade itself is made up of 3m
Return mullion
Flow mullion
by 1.5m double-glazed panels giving an overall U-value including frames of 1.40 W/sq m K. The façade has a ‘light’ solar performance coating to limit summer time solar gain, although generally throughout the year passive solar gain on this facade plays a key role in reducing heating demand.
July 2012 CIBSE Journal 29
at the top of the raked seating area. At peak times (midsummer with full capacity spectators) fresh air cooling will be necessary to cool the supply air to 26C. Cooling energy is provided by two 390 kW water-cooled ammonia chillers. Each of the two non-HFC (hydrofluorocarbon) chillers is connected to a pair of dry air coolers and is located on the south-end of the building, enclosed by a green wall system. The condensing water circuits are connected with the pool heating circuit for diverting waste heat for pool water heating, reducing the overall heating demand.
U-value of glazed façade
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