Working environment requirements and precautions for solar electric heating tubes

Solar heating tubes are electrically powered heating devices, so safety is paramount during use. After all, accidents caused by electricity are very serious. The following describes the operating environment requirements and precautions for solar heating tubes.

Operating Environment Requirements and Precautions for Solar Heating Tubes

1. The components are permitted to operate under the following conditions.

A. Relative humidity should not exceed 95%, and there should be no explosive or corrosive gases.

B. The operating voltage should not exceed 1.1 times the rated value, and the housing should be effectively grounded.

C. Insulation resistance ≥ 1MΩ, dielectric strength: 2kV/1min.

2. The heating tube must be properly positioned and secured, and the effective heating area must be completely immersed in liquid or solid metal. Dry heating is strictly prohibited. If scale or carbon deposits are found on the tube surface, they should be cleaned immediately before use to avoid affecting heat dissipation and shortening the service life.

3. When heating fusible metals or solid nitrates, alkalis, asphalt, paraffin wax, etc., the operating voltage should be reduced first. Wait until the medium has melted before increasing it to the rated voltage.

4. When heating air, the components should be arranged evenly and crosswise to ensure good heat dissipation and sufficient heating of the air flowing through them.

5. When heating nitrate salt, safety measures should be considered to prevent explosions.

6. The wiring should be placed outside the insulation layer to avoid contact with corrosive, explosive media, and moisture. The lead wires should be able to withstand the temperature and heating load of the wiring part for a long time. Avoid excessive force when tightening the terminal screws.

7. The components should be stored in a dry place. If the insulation resistance drops below 1MΩ due to long-term storage, they can be dried in an oven at approximately 200°C or heated at a reduced voltage until the insulation resistance is restored.

8. The magnesium oxide powder at the outlet of the electric heating tube should be protected from contaminants and moisture in the location of use to prevent leakage.