Carrier water-cooled screw chillers, with a combined cooling capacity of more than 1.4MW, have been installed at Wiltshire County Council’s headquarters.
Two high performance AquaForce 30XW-V variable speed units were selected for the council’s HQ in Trowbridge. The chillers are based on inverter-driven twin-rotor screw compressors, which allow the cooling capacity to be precisely matched to the changing building load, significantly reducing power input.
Automatically adjusting the capacity results in Eurovent-certified industry leading values for European Seasonal Energy Efficiency Rating (ESEER) of up to 8.
“The key requirement for the replacement chillers was they had to be extremely reliable and based on proven technology from a reputable manufacturer. Secondly, the equipment had to be installed by an experienced contractor with a successful track record on similar projects,” said Ian MacDowall, Director, K4 Service, who led the replacement project.
“With the help and technical support of Russ Tyrrell, Carrier’s Senior Sales Engineer, we chose Carrier screw chillers, as they are very energy efficient and rock solid, with an unrivalled reliability record and long operational life.”
Continuity of cooling had to be maintained throughout the project to enable the building to continue operating. To ensure this, K4 Service located a temporary chiller in the car park and connected it to the building’s chilled water system, maintaining supply to the air conditioning during the changeover.
The basement plant room housing the chillers had very restricted access, requiring a carefully planned and executed lift-and-shift operation. The previous units were disconnected and extracted using a crane through a deep well above the plant room, and the new units were lowered into position.
The chillers are based on proven inverter-driven twin-rotor screw compressors
Due to the compact design and configuration of the chillers, it was possible to deliver the units into the tight plant room without the need to modify the structure, saving time and money on the installation. With a width of approximately 1.25 metres for units up to 1,000kW, the chillers can pass through standard-size door openings and require minimum floor space.
“AquaForce screw chillers are a premium and compact solution for commercial and industrial applications where customers require exceptional reliability and excellent energy efficiency. The Carrier units were – literally – a perfect fit for the end user’s requirements,” said Russ Tyrell.
Philip McMullan, Contracts Manager, Hard FM, Wiltshire Council, said: “I am pleased to say the Carrier units have performed impeccably since being installed. Environmental conditions in the building are being maintained at optimum levels, and efficiency performance so far is as anticipated,” said
Peter Lifton of Box Twenty Consulting, Bristol, was the project consultant.
For more details on Carrier’s AquaForce range, click here.