Chillers maximise free cooling

19 July, 2005

Designed to maximise free cooling and energy-efficient operation — Airedale’s Ultima Compact chillers now have cooling capacities up to 450 kW.

Airedale has added higher-output chillers to its Ultima Compact range of free-cooling chillers with scroll compressors. The additions cover cooling capacities from 160 to 450 kW, complementing existing 75 to 150 kW units. There are 15 new models in a choice of super quiet, quiet and standard versions. Each of the new models has multiple scroll compressors, with up to six stages of cooling capacity to precisely match application. Free cooling is given priority wherever available, with the compressor used as top-up cooling when free cooling cannot satisfy the requirement. Based on Met. Office figures for London, energy savings of 35% can be expected compared with a conventional air-cooled liquid chiller. There is a complete range of hydronic packages, including pumps, by-pass legs, expansion vessels and pressurisation units. Sickle-bladed fans, high-efficiency plate evaporators and integrated condenser coils ensure efficient heat rejection. Electronic expansion valves improve seasonal energy-efficiency ratios. These chillers are designed and optimised for R407C and take advantage of the glide characteristics to maximise the performance of the heat exchanger.

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