Tubular heat exchanger

liquid/liquidstainless steelcorrosion-resistant

The combined heat exchangers combine the advantages of tubular heat exchangers and electrical heating. If the heating fluid is not yet available (e.g. boiler fired by heavy oil), electrical preheating is effected. The tubular heating surface transfers the thermal energy of one medium to the other. The fluids involved are mainly liquid but can also be gaseous. The type and properties of the fluids, pressures and temperatures as well as the desired operating points in the process are important for the design. One fluid in the combined heat exchangers dissipates the energy, and this energy is transferred through a pipe wall to the other fluid. Here, it is important that the design be matched to the general conditions, for each fluid has its specific properties. Combined heat exchangers are mainly used for heating heavy-oil storage tanks. Of course, they can be used for all fluids which can be used for tubular heat exchangers and electrical flow-type heaters. I. Water Drinking water, max. surface load depending on the water hardness 4 – 6 W/cm² Circulating and/or heating water, max. surface load approx. 10 W/cm² Softened water; observe the maximally admissible chloride content, max. surface load approx. 19.0 W/cm² Ultra-pure water; here, a low-pocket or pocket-free design with a defined surface quality is useful in most cases. Fully desalted water; here, non-ferrous heavy metals should not be used, maximum surface load approx. 10 W/cm² II. Oil Heavy oil, not pumpable in a cold condition, maximum surface load between 1 and 2 W/cm² depending on the quality Hydraulics oil, maximum surface load approx. 0.6 – 1.2 W/cm²