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
Air duct heaters are primarily composed of the inner chamber, multi-blade tubular electric heating elements, insulation layer, junction box, fan (optional), and control system, etc. Among them, the electric heating elements are the core components of the heater, which are heated by the current.
The function generates heat, raising the air to the desired temperature. The insulation layer is used to reduce heat loss and enhance heating efficiency.
II. Working Principle
The working principle of the ducted heater is relatively simple. When cold air blows through, it passes over an electric heating element to be heated. The heated air, after collecting temperature signals through the exhaust outlet, feeds these signals back to the control cabinet. Instruments on the control cabinet...
The table controls the heater's on/off operation based on the set target temperature, achieving the purpose of 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: With advanced electric 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 rapid 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: The duct heater demonstrates good mechanical properties and strength due to the use of special alloy materials as the heating element, withstanding the impact of high-pressure air flow.
Long service life: The lifespan of the duct heater can reach several decades as long as it is not used against the operational instructions.
Air Purification: Heat-generated air is dry, moisture-free, non-conductive, non-combustible, non-explosive, chemically inert, and pollution-free, ensuring safety and reliability.
Section 4: Application Fields
Duct heaters have been widely used in aerospace, arms industry, chemical industry, and research and production laboratories in colleges and universities. 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 also suitable for applications such as drying, sulfuring, heat treatment, reheating, and dehumidification of various materials.
