Technical design principles of far-infrared ceramic heaters
The evaluation of the quality of the far-infrared heating system mainly depends on whether the heating is mainly based on radiant heating, supplemented by conduction and convection heating. The larger the proportion of radiant heating, the better the performance of the system.
After far-infrared workers have measured and theoretically studied the heat energy conversion efficiency of a large number of far-infrared drying tunnels and ovens. In the mid-1980s, two methods to determine the radiation drying tunnel were proposed: one is to measure the temperature of the space inside the drying tunnel and the surface temperature of the element. Only when T space <T element 20～40℃, the drying tunnel is called radiation drying tunnel. When it meets the far-infrared power-saving conditions, it is then called a far-infrared drying tunnel. The second is to change the flow operation to static baking. If there is no unevenness of the paint film (color difference), it can be called a radiation drying tunnel, otherwise it cannot be called far-infrared heating.
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Design principles of far infrared heating technology
After years of research and practical discussion, scientists have summed up the following three design principles for far-infrared drying tunnels and ovens:
(1) Uniform radiation field design: The uniform radiation field design aims to ensure that the radiation energy received by the surface of the workpiece is uniform no matter where it moves. The uniform radiation field design is to use the principle of radiation optics to calculate a set of data, namely: element arrangement, element spacing, reflector form, element and workpiece distance. So as to get rid of the qualitative design of 100-350mm between components and 50-400mm between components and workpieces.
(2) Uniform temperature field design: In order to prevent the uniform temperature field in the drying tunnel from being destroyed, the temperature difference between the upper and lower left and right in the drying tunnel should be kept at ±5～10℃.
(3) Uniform temperature control technology design: On-off temperature control leads to large local temperature fluctuations. Thyristor voltage regulation will reduce the radiation of the component and increase the convection effect. The application of a power regulator to control the temperature makes the far-infrared technology reach the point of perfection.