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 chamber, multi-bladed tubular electric heating elements, insulation layer, junction box, optional fan, and control system. Among them, the electric heating elements are the core components of the heater, which produce heat through the action of electricity to heat the air to the required temperature. The insulation layer is used to reduce heat loss and improve heating efficiency.
Section II: Working Principle
The working principle of the duct heater is relatively simple. When cold air passes through, it is heated by the electric heating tube. The heated air collects temperature signals through the exhaust outlet, which are then fed back to the control cabinet. The instruments on the control cabinet control the on/off of the heater 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: Due to the use of advanced electric heating elements and optimized heat exchange design, the duct-type heater boasts an exceptionally 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: The air duct heater, utilizing a specialized alloy material as the heating element, exhibits superior mechanical properties and strength under the impact of high-pressure air flow.
Long lifespan: The duct heater can last for decades without violating the operating procedures.
Air Cleanliness: The hot air produced during the heating process is dry, moisture-free, non-conductive, non-flammable, non-explosive, chemically non-corrosive, and non-polluting, ensuring safety and reliability.
Section 4: Application Fields
Air 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 accessories testing. Moreover, due to its...
Heating any gas is possible, with the resulting hot air boasting numerous excellent properties, thus it is also used for various applications such as drying, sulfuring, heat treatment, reheating, and dehumidification of different substances.
