Cooling coils, helical liquids

If only small amounts of heat need to be transferred, the tank wall is a satisfactory heat transfer surface, when appropriately jacketed (Fig. 1.2). The wall surface often is inadequate for heat transfer, particularly in the case of industrial tanks, because upon scale-up the liquid volume increases according to D whereas the surface area only increases according to D. Additional heat transfer surfaces have then to be installed in the form of differently designed pipe coils or pipe bundles (helical coils, meander coils (cooling basket) tube bundles see Fig. 1.3). 

For heating or cooling liquids in a baffled cylindrical tank equipped with a helical coil and a turbine impeller,... 

---