Duct heaters, also known as duct heaters or duct electric heaters, are specialized equipment designed for air heating within ducts. Below is a detailed explanation:
I. Structure and Composition
The duct heater is mainly composed of the inner tube, multi-blade tubular electric heating elements, insulation layer, junction box, fan (optional), and control system, etc. Among them, the electric heating element is the core component of the heater, powered by electricity.
The function generates heat, heating the air to the required temperature. The insulation layer is used to reduce heat loss and improve heating efficiency.
II. Working Principle
The operation principle of the ducted heater is relatively simple. When cold air blows through, it passes over an electric heating element for heating. The heated air then collects temperature signals through the exhaust outlet, which are fed back to the control cabinet. Instruments on the control cabinet monitor these signals.
The table controls the heater's on/off operation based on the set target temperature to achieve constant temperature control.
III. Technical Features
High heating temperature: The duct-type heater can heat air to very high temperatures, typically up to 450°C, even as high as 850°C. At the same time, the housing temperature remains relatively low, usually around 50°C.
High heating efficiency: Due to the use of advanced electrical heating elements and an optimized heat exchange design, the duct-type heater boasts an extremely high heating efficiency, exceeding 0.9.
Rapid heating and cooling rates: The duct-type heater has both fast heating and cooling rates, with relatively stable adjustments. This makes it highly suitable for automatic control systems, allowing for precise air temperature control.
Excellent mechanical properties: Due to the use of specialized alloy materials as the heating element, the duct-type heater demonstrates good mechanical properties and strength under the impact of high-pressure air flow.
Long lifespan: The duct heater can last for decades when used in accordance with the operating procedures.
Air Purification: Heat-generated air is dry, free of moisture, non-conductive, non-flammable, non-explosive, non-corrosive, and pollution-free, ensuring safety and reliability.
Section 4: Application Fields
Duct heaters have been widely applied in aerospace, military industry, chemical industry, and research and production laboratories of universities and colleges. They are particularly suitable for automatic temperature control and high-flow high-temperature combined systems and accessory testing.
In addition, due to its ability to heat any gas, the resulting hot air possesses various excellent properties, making it suitable for applications such as drying, sulfuring, heat treatment, reheating, and dehumidification of various materials.
