Comparison between Air Electric Heater and Duct Electric Heater:
Characteristics of Air Electric Heater:
1. There are generally two types of air electric heaters: resistance wire electric heaters and ceramic electric heaters.
2. Resistance wire electric heaters come in two types: bare wire and tubular.
3. In practical engineering, there are resistance wire electric heaters and ceramic electric heaters.
4. The air electric heater must be interlocked with the supply fan. Startup sequence: supply fan → electric heater; shutdown sequence: air electric heater → (1 minute later) supply fan. The air electric heater must not be turned on if the supply fan is not running.
5. The air electric heater and the metal duct in which it is installed should have good grounding.
6. The duct within 0.8 meters before and after the air electric heater should use insulating non-combustible materials for its insulation.
Technical Characteristics of Air Electric Heater:
1. It can heat air to very high temperatures, up to 450°C, while the shell temperature is only about 50°C.
2. High efficiency: up to 0.9 or more.
3. Fast heating and cooling rates, up to 10°C/s, with quick and stable regulation. The duct-type air electric heater does not experience lead or lag in the controlled air temperature, which prevents temperature control drift, making it very suitable for automatic control.
4. Good mechanical performance: Since the heating element of the duct-type air electric heater is made of special alloy material, it has better mechanical performance and strength than any other heating element under the impact of high-pressure air flow. This is particularly advantageous for systems and accessory tests that require continuous air heating over long periods.
5. When used in accordance with operating procedures, it is durable and has a service life of several decades.
6. Clean air and small size.
7. Multiple types of air electric heaters can be designed according to user needs.
