Cooling water is needed to dissipate the heat losses of the furnace coil, caused by the high current and the resistance of the furnace coil, the losses in the iron piles, the short circuit ring and the thermal losses from the crucible wall. The water is usually obtained from the municipal supply system. Only in the case of very hard water with a very high limescale content is it necessary to resort to boiler water or treated water. The water runs within a closed circuit, and only the “lost water” has to be replaced.
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