The Siemens head offices in Norway have had a control program for Legionella Control running for years. NorKjemi performs control on Legionella-exposed installations in order to minimize the risk of Legionella infection. These days the focus is on conserving energy and cutting energy costs in waterborne energy systems.
Water is widely used as an energy carrier in closed circuit heating, cooling and recycling systems. The liquid consists essentially of water, with additions of glycol, alcohol or brine where anti-freeze properties are needed. Such systems are in general constructed from steel pipes, and as a consequence are prone to corrosion. A water treatment program is therefore recommended. It should be based on air removal, corrosion protection and mechanical filtering to reduce the risk of corrosion and sedimentation.
Clean surfaces of cooling units are also essential to energy transfer. In Norway these days, sea water exchangers and dry coolers are put into operation for the summer season. Adjustment, repair and replacement of equipment is often a part of this routine, but having clean surfaces is as important. 'This is essential to achieve good effect and avoid extra energy costs', explains Product Manager and M.Sc. of Chemistry Van Ha Doan at NorKjemi.
Air pollution, such as particles, dust, car exhaust and pollen, accumulates over time and forms a coating on the outer surfaces of dry coolers and cooling towers, while seawater exchangers experience internal fouling. This reduces energy transfer rapidly, the effect will be poor and energy use increases. Such facilities should be inspected regularly by qualified personnel. Chemical and physical cleaning should be performed as part of maintenance routines or when needed.
At the Siemens building in Oslo, Norway, NorKjemi recently performed a chemical treatment to optimize the effect on closed circuits and cooling towers. 'Clean surfaces and a good water treatment program must be in place to achieve sufficient cooling. NorKjemi helps to ensure that our water systems are working optimally, thus reducing energy consumption', Operational Manager Stein Jørnli says, here on the roof of the Siemens building with its six cooling towers.