via collector pipes on the supply and return side requires the observation of “Tichelmann’s principle”, if the collector pipes are connected relatively close to each other with short cooling water paths. In older induction furnaces, the supply and return lines on both sides were installed directly next to the coil connections. In this case, the flow direction had to be the same in both pipes, i.e. on the right side the water flows in total from the top and in order to the coil sections. On the left side, the water flows in order from the top down and in total away at the bottom. Tichelmann’s principle refers to the optimum distribution of collective flows between individual flows and the return of individual flows to collective flows. Expressed more simply, the flow direction must be the same in both systems. With water, this can be solved for volumes of over 10 l/min. as shown in Diagram A. With volume regulation by means of narrow pipes (DN 5 – 8 mm) and lengths of 3 -6 m, this principle can be dispensed with, see Diagram B.
