Mineral Insulated Heating Elements
Temperature Range -273°C to 1000°C
extremely versatile, easily deformable, high energy density
- Standard Heating Elements with cold ends 1,0-3.0mm
(Available from 100Watt to 3500Watts)
- Single Core Heating Elements
- Just-in-time building materials readily available from stock.
- which are readily available in arbitrary lengths
- Twin Core Heating Elements with and without cold ends
- PTFE and Fiberglass Power Supply Cables
- Metal Ceramic Connections
Introduction to heating
- Resistance heating
Resistance heating is one of the first applications of electricity. In the course of a century, thousands of heating problems have been solved ranging from megawatts down to a few watts, or less. The fundamentals are always the same, the requirements and solutions widely different. Between a large furnace constructed as an individual unit and a domestic heater produced in large quantities, there exist a number of cases where no «ready-made» solution is available.
For such cases often presents a suitable answer to
• Heating from the cryogenic temperatures up to 1000°C.
• Heat dissipation either very low or very high power (from few watts to several tens of kilowatts).
• For use in air, under vaccum or high pressure and in any corrosive enviroment compatible with the sheath material.
• In applications requiring high reliability components.
- Heat transfer
Heat transfer only takes place when there is a difference of temperature between two bodies. In electrical heating this difference always occurs at the point where energy is dissipated and its surroundings. The heat transfer mechanism is always a combination of:
When heating solids, conduction plays a major role ; in a liquid, conduction is always the start but convection will take over its importance. In a gaseous medium, one can hardly speak of conduction, and heat transfer is mainly a question of convection. Radiation, though always present is strongly dependant on its temperature level and, often, the only way of heat transfer in vacuum. In heat transfer these three phenomena play a role, only local circumstances will define the share played by each. THERMOCOAX will provide a suitable solution to each heating application.
- Construction of heating elements
The heating elements are screened electrical resistances of small diameter designed to be shaped and incorporated into heating systems from the simplest to the most sophisticated.
They consist of one or two straight current carrying cores in a flexible metal sheath, electrically insulated from one another and from the sheath by means of a highly compacted refractory powder. To cope with the problems of high heat density dissipation, a special cold-end construction has been developed.
Here the resistive core is extended at both ends by a different material of significantly lower resistance.
The outer sheath is continuous only the inner core construction changes. These ends can be fitted with connectors.
By combining small diameter and hard packed insulation, a heater made of such a cable can be given virtually any shape without deterioration of either its insulation or its sheath.
To improve the heat contact, and thus heat transfer, the cable can be deformed, brazed or welded into its optimum position.