Carrier has supplied three high performance screw chillers for the pioneering refurbishment project at PwC’s headquarters at 1 Embankment Place, London.

The Carrier AquaEdge 23XRV chillers have helped the building to achieve what is believed to be the highest ever Building Research Establishment Environmental Assessment Method (BREEAM) rating for both new build and existing buildings.

PwC selected Carrier chillers to achieve optimal energy efficiency and achieve a high BREEAM rating to comply with its corporate environmental policy. Following the project, the nine-storey, 42,000sq m commercial office building scored 96 out of a maximum of 100, giving it an equivalent BREEAM rating of ‘Outstanding’.

The building services solution, designed by consultant ChapmanBDSP Limited, is based on a biofuel-powered combined cooling, heating and power (CCHP) plant. Cooling is supplied by Carrier’s three water-cooled inverter screw chillers and adsorption units by another manufacturer.

The Carrier chillers, equipped with Greenspeed Intelligence, were selected for their high cooling capacity, compact footprint and exceptional energy  efficiency. They have a SEER rating in excess of 10.0.

To provide resilience, the chillers are sized to allow two machines to meet the anticipated total load for the building, enabling one machine to remain on standby. They also provide full back-up in case the CCHP plant has to be taken offline for maintenance.

Chilled water is used to cool the building via chilled beams, with boilers providing heating to augment the low grade hot water circuit from the CCHP system. In addition, high quality comfort conditions are supported throughout the building with a combination of air handing units and fan coil units.