Cooling is vital to ensure comfortable conditions for customers and staff on London’s new Elizabeth
Line, part of the colossal Crossrail project. It is also essential to ensure the reliability of power and
electronic systems. However, the contractors found no commercially available chiller that complied
with the strict safety standards for equipment deployed underground.
End User: Elizabeth Line, Crossrail
Application: Cooling for underground stations
Equipment: 15 customised Carrier AquaSnap® air-cooled liquid chillers with Greenspeed Intelligence®
Carrier’s UK team worked closely the company’s chiller research and development centre in Montluel, France, to develop a solution that met the stringent fire prevention and safety standards for the project.
We assessed the detailed material and design requirements for the underground chillers and identified the variances from our standard factory specification. This required detailed research on alternative components and their application. The result was a design for a bespoke chiller that fully met the requirements for the project.
The units are equipped with zero-halogen, low-smoke insulation and cables, and finished with specialist paint, formulated to emit very limited smoke and/or fumes if exposed to heat or flame. The team went back to the drawing board and designed a completely new chiller wiring loom.
In addition to the importance of fire-safe materials for equipment used underground, reliability is a key issue. The chillers are built on a heavy-gauge galvanized steel frame and come with a range of security grilles and hail guard options. Safety features include low ambient head pressure control and high short circuit current rating.
The bespoke design was assessed by the contractor and the Crossrail engineering team and found to be fully compliant.
Having gained approval, Carrier built and supplied 15 customised Carrier AquaSnap® air-cooled liquid chillers with Greenspeed Intelligence® to provide resilient, reliable cooling for new Elizabeth Line stations at Tottenham Court Road, Paddington, Woolwich and Farringdon.
Matthew Maleki, Carrier’s product manager who headed the compliance project, said: “The brief was challenging. However, Carrier’s technology specialists were very innovative, and we worked closely with them to develop a custom-made chiller that met all of the requirements, in order to provide efficient and reliable cooling with proven Carrier technology.”
Carrier is believed to be the only manufacturer able to supply chillers in full compliance with the fire safety and materials standards for use on London underground stations.