CIBSE AWARDS | AMOREPACIFIC HQ TWIN ELEVATORS ARE A DOUBLE WIN The central courtyard arrangement means the lift and stair cores have had Unusually, the scheme features two independent lift cars in each shaft, one on top of the other. Both cabins use the same guide rails and landing doors. According to Arup, this twin-lift arrangement, with hall control, gives an increase in conveyance capacity and a reduction in waiting time, as well as a reduction in energy consumption when compared with a conventional double-deck lift. At the time, it was the largest application of its kind in the region. drybulb/25.5C wetbulb summer, and -11.3C in winter. The opportunity for natural ventilation on the office floors during the swing seasons has been maximised by locating workstations next to the faade, with meeting rooms and auxiliary areas concentrated in the interior zones of floor plates. Motorised ventilation louvres at high and low level ventilate the perimeter spaces in spring and autumn, to reduce power demand from the air conditioning. Underfloor mechanical displacement ventilation serves the central floor zone and provides mixed-mode ventilation to the perimeter. Displacement ventilation was chosen to provide flexibility in the layout for the floor plans and to facilitate a simple zoning control strategy between the perimeter zone (which can be isolated when the windows are open) and the central floor plate zone, which remains operational regardless of window position. During spring and autumn, conditions at the perimeter of the building can be maintained by natural ventilation, as can those in the areas of building facing the courtyard, explains Marsh. In line with LEED, office ventilation rates are 30% higher than ASHRAE 62.1 minimum requirements. The systems are designed to operate at full fresh air when Placing workstations next to windows maximises the use of daylight and exploits views out The courtyard is intended to be the communal centre of the workplace external conditions allow. An interlock prevents operation of the mechanical ventilation system when the louvres are open. Office temperatures are maintained by a combination of perimeter fan-coil units for the perimeter zones, and floor-standing air handling units for the central areas. Fresh air is delivered from central air handling units, located at roof level. Placing workstations next to windows also maximises the use of daylight and exploits views out; 98% of workspaces have a direct line of sight to the outside. A central chilled water system will provide cooling to meet the building requirements. Chilled water plant is installed in the basement, with water cooled chillers, primary and secondary pumps, and ancillary equipment located in a dedicated plant room. Cooling towers provide heat rejection for the chillers. The maximum cooling load for the site is about 10MW. Local codes limit the cooling that can be directly generated using dedicated chillers to 40% of the total building load. The chiller room will house four water-cooled centrifugal chillers. Two chillers provide chilled water 22 June 2021 www.cibsejournal.com CIBSE June 21 pp20-23 Amorepacific.indd 22 21/05/2021 15:59