University of Leeds

University of Leeds

The challenge University of Leeds case study

The high performance computing (HPC) facility of the University of Leeds provides its researchers with access to a large number of computer intensive servers for computational modeling. Higher densities have created an extra 30kW of load per 42U rack, which could not be cooled by conventional CRAC units since this would involve space, design and cabling issues. The University, assisted by the School of Mechanical Engineering, sought an alternative solution that meets the University’s criteria of investment in energy efficient, latest technology in its data centres.

Airedale solution

  • 3 x OnRak™ 28kW rear door heat exchangers cooling three high density racks in the HPC facility

  • 2 x Ultima™ Compact FreeCool 240kW chillers offering free-cooling for up to 65% of the year


“Airedale’s OnRak™ meets the need for novel cooling solutions in the HPC arena, where heat load per square metre has increased dramatically. By meeting our space constraints and slotting into our existing cooling loop, the OnRak™ doors have saved us space in an already densely packed environment. The OnRak™ also gives us the flexibility to fit rear door heat exchangers to legacy or new cabinets from any manufacturer.”

Dr Jon Summers Senior Lecturer, Institute of Thermofluids, Surfaces and Interfaces, School of Mechanical Engineering, University of Leeds (

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