The mix of winners and losers at this year’s Sochi Winter Olympics may have been unpredictable, but one thing was for certain; keeping the relevant competition areas adequately snow-covered for the entire event duration was critical to the Games’ viability and success. Sufficient natural snow could not be guaranteed, so it had to be complemented on demand by snow from an alternative, man-made source.
Eight of WEG’s 22kW motors formed a crucial part of the system; they were located within a pair of large Evapco AT Cooling Towers assembled besides a centrally located pumping station. The feed pipes radiated from the building to competition areas requiring snow cover, where they terminated in tubing areas which were the supply points for mobile snow cannons. In this application the cooling towers were not running 24/7, but they had to respond quickly on demand. They generated chilled water which, after supplemental conditioning, was supplied to the snow cannon. When this conditioned water left the cannon in a sufficiently cold atmosphere, it turned to snow.
The two Evapco AT Cooling Towers used were induced draft axial fan counterflow cooling types. Their design combined low energy consuming axial fans with high performance counterflow heat exchange. Each Sochi unit, with a footprint of approximately 11m × 6m and a height of nearly 6m, had four axial fans, each driven by a WEG 22kW motor. Both cooling towers achieved air flows of 214m³/s.
These cooling towers had to be resistant to extremes of temperature and aggressive corrosion, as models like those at Sochi are installed across Europe, North Africa and the Middle East. Those at Sochi had to be subjected to standby temperatures of -20degC while others in the Middle East may experience temperatures of +50degC. Conditions within the towers were even more challenging with temperature extremes and relative humidity levels of 100 per cent exacerbating the corrosive environment. In the AT range, long-lasting corrosion protection was guaranteed with heavy gauge mill hot-dip galvanised steel zinc casing. The galvanised steel construction withstands the most difficult environmental and operating conditions.
Evapco selected WEG motors to drive their cooling tower fans partly because they accepted WEG as a globally recognised brand name and accordingly used their products as standard components. However WEG’s ability to understand Evapco’s special design concerns, and flexibility in meeting them, was of equal importance. With anti-corrosion coating and environmentally protected enclosures, WEG’s products had to comply with Evapco’s cooling tower specification for motors, as well as being Russian state standard GOST certified.
Rob Vandenboer, Product Manager at Evapco Europe comments: “We needed little or no help from WEG during project build their motors as delivered had been prepared perfectly for the job. We’re extremely happy with the quality of WEG’s products and service, and especially delighted with the support received from WEG’s office here in Belgium. They have consistently performed well for us over many years”.
For more information on WEG motors visit www.weg.net/uk.