lectrical flow-type heaters are designed for efficiently heating liquid or gaseous flowing fluids. The design is based on the general conditions such as the type and properties of the respective fluid, pressure and temperature as well as the desired operating points in the process
Electrical flow-type heaters can be designed for mobile operation, on structures similar to hand trucks for smaller powers, on racks for larger powers. Thus, the electrical heater can easily be moved from place to place.
Electrical flow-type heaters directly heat fluids, converting electrical energy in the heating rods to thermal energy. The thermal energy is then transferred from the heating rods to the fluid. Here, it is important that the design be matched to the general conditions, for each fluid has its specific properties.
For example, these fluids are heated in mobile electrical flow-type heaters:
I. Water
Drinking water, e.g. for sanitization, max. surface load 4 – 6 W/cm² 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. 10 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