Page 195 - AGC_EN_iBook

195
Circulating water in the exposed concrete ceilings helps regu- late temperature differences during of ce hours.The ceilings are thus used for storing heat during of ce hours and releasing it outside of ce hours, with this thermal inertia limiting cooling requirements.
Puri ed air is pulsed at a temperature of 18 to 20°C, depending on the temperature of the outside air.
Complementing this pro-active use of the concrete, the oor convectors are used to cool inside rooms in hot weather (when the outside temperature exceeds 15°C).
the conference centre meeting rooms
The treatment of ambient air in the small meeting rooms is identi- cal to that in the small partitioned-off rooms in the of ce wings. Ventilation at a rate of 17,917 m3/h comes from the central air con- ditioning unit and is shared with the restaurant on the rst oor. The unit is also equipped with a hygroscopic heat recovery wheel. In the larger meeting rooms (seating more than 10 people) the ventilation rate is controlled by the air quality measured by a CO2 sensor built into the return air duct. Minimum ventilation is pro- vided in all partitioned rooms when in use.
the kitchen
Ventilation of the kitchen is via a separate 10,000 m3/h air-condi- tioning unit tted with a heat pipe6 to pre-heat outside air.
The kitchen ranges are equipped with capture jet hoods, cutting the air ow used by 35 to 47% of that of conventional systems7. The hoods are also all equipped with low-loss cyclonic lters offer- ing 95% ef ciency on fat particles ≥ 8 μm and with a UV-C process- ing unit for neutralizing the fat particles and vapours contained in the exhaust air. Linked to an active carbon lter anti-smell system, this technology enables the recovery of heat from exhaust air and its discharge outside via the car-park courtyard. The UV treatment of the exhaust air helps regenerate the active carbon lters.
the gallery
Under normal use conditions, the thermal comfort of the gallery does not require comprehensive air-conditioning. Comfort is maintained by keeping the thermal mass of the reinforced con- crete roof overlooking the second- oor gathering areas at a con- stant temperature, by radiation from the main lobby’s under oor heating, by the 1,400 m3/h pulsation of puri ed air from the con- vectors at the foot of the 7.2 m high rst- oor glass windows of the north and south facades, and by the 600 m3/h pulsation at the foot of the ground- oor reception desk.
Puri ed air, supplied only during of ce hours, is extracted via the toilet areas on the rst and second oors.
When the gallery is used for presentations, additional ventilation at a ow-rate of 11,320 m3/h comes from a separate air-condition- ing unit via the plenum oor and its associated outlets. Extraction takes place in the gallery’s upper part.
the logistic area
Ventilation of the logistic area is via a separate 5,150 m3/h air-con- ditioning unit tted with a double-plate heat exchanger. Ventilation is controlled by time switches in a way similar to that of the other air-conditioning units.
The rooms are heated via panel radiators sized to operate at low temperatures (50/40°C).
Situation in the gallery – summer/winter