Duct heaters, also known as duct-style heaters or duct electric heaters, are specialized devices designed for air heating within ducts. Below is a detailed explanation:
I. Structure and Composition
The duct-type 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 current.
The function generates heat, warming 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 a duct heater is relatively simple. When cold air blows through, it passes over an electric heating element to be heated. The heated air then collects temperature signals through the exhaust outlet, which are fed 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 to achieve 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 ducted 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-type heater demonstrates superior mechanical properties and strength due to the use of specialized alloy materials as the heating element, standing up well under the impact of high-pressure air flow.
Long lifespan: The duct heater can last for decades, provided the operating instructions are not violated.
Air Cleanliness: The heated air produced during the process is dry without moisture, non-conductive, non-flammable, non-explosive, free of chemical corrosiveness, and non-polluting, ensuring safety and reliability.
Section 4: Application Fields
Duct heaters have been widely applied in aerospace, military industry, chemical industry, and scientific research and production laboratories of 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 suitable for a range of applications including drying, sulfuring, heat treatment, reheating, and dehumidification of different substances.
