Hot spots on heating elements (hot-points)

A "hot-point" always occurs at the "border" between the heat-giving surface and the fluid film in contact. Naturally, a turbulent flow (presenting high values ​​for the Reynolds Number), helps to homogenize the fluid temperature due to the greater uniformity in the heat distribution provided by convection.

We agree, even with perfect homogenization, a "hot-point" is only definitively eliminated when the temperature of the solid surface (pipe wall) does not exceed the maximum allowed temperature of the fluid.

"In other heating systems this is" impossible ". The occurrence of" hot-points "is commonplace and disastrous, since at first the fluid chars and then cokes".

Due to the concept of Induction heating, and special care with applied engineering regarding the ideal Reynolds Number, Film Coefficient and Power Density, it eliminated the problem of "hot-points" from its equipment.

The INDUCTIVE ELECTRIC HEATERS are not "shelf" items in industrial terms, that is, they are differentiated equipment for each client / process. According to the type of fluid, maximum and minimum flows, temperatures to be reached and maintained, a specific project in the field of Thermal Engineering is born. In contrast, all this specialty does not accumulate costs in the materials used, since the technical variants applied also designate the "physical" ideal of the equipment, making it compatible with the final yield obtained, of the order of 95%. This does not occur in heaters of any other species, as they all promote indirect heating.

Thus, for each BRASCOELMA project, the specifications are born: the number and diameter of the tubes (determinant of the desired speed), and the ideal imposition of the Film Coefficient (determinant for the dimensioning of the Energy Flow, compatible for the non occurrence of "hot-points"). All engineering and design are accurately and rigorously transported for the manufacture and consequent operation of the equipment, since industrial needs are configured in obtaining thermal results.

Therefore, the "electrical energy" used to generate the necessary "thermal energy" at a given moment in the industrial operation of the INDUCTIVE ELECTROTHERMAL HEATER is a "consequence" and not a "cause" in terms of design; although these conditions are reversed during operation.

Advantages of the Inductive Electric Heater

The ELECTRIC INDUCTIVE HEATER for fluids has the following advantages:

In terms of the quality that the process requires, the solution we have adopted characterizes the technical ideal. Bearing in mind that we ensure the highest reliability of the various aspects adopted during the manufacture, installation and operation of the equipment now offered, namely:

• a. The non-occurrence of “hot spots” (hot-point or hot-spot) in the fluid under heating;
• b. The minimum space occupied by our equipment. The electro-electronic control panel is positioned separately along with other commands;
• c. Reliability in a virtually “zero” oscillation of processing temperatures;
• d. The “zero” potential difference in the heating system;
• e. The overall yield of 98% between the thermal load required for heating and the applied thermal power;
• f. Immediate start-up without loss of empty operation;
• g. The degree of safety, obtained by the redundancies in the operational controls of the system, emphasizing that the energy source and the fluid being heated, are physically and electrically isolated;
• h. The level of Engineering made available, at the various stages of the supply contract;
• i. In terms of financial profitability, we allow ourselves to emphasize the occurrence of a zero maintenance index in the electrothermal system, due to the simple absence of components subject to wear, since the helical heating pipe walls act as electrical resistors. < / li>