are used for higher outputs and an available operating water system. In regions with high air temperatures these are used in conjunction with evaporation coolers to maintain the minimum cooling water supply temperature of 34 °C for frequency converters and 45 °C for induction furnaces.
Exchangers function like an electrical transformer. If for example 34.5 m3/h flow through the furnace circuit, which must be cooled down from 65 °C to 38 °C, 103.5 m3/h must flow on the cooling tower side or operating water side, which in turn will be heated up from 21 °C to 30 °C.
The product of volume x temperature difference must be the same on both sides. 103.5 m3/h x 9 K=34.5 m3/h x 27 K ➜ 931.5 mm3 K/h=931.5 m3 K/h