Finned tube radiators, also known as finned tube heat exchangers or air heaters, are widely used in industrial applications for heating, cooling, and air conditioning. These devices function by transferring heat between a fluid (such as refrigerant, hot water, steam, or heat transfer oil) and the surrounding air. They can be used to either warm the air using a heat medium or cool it using cold water, making them essential components in heat exchange systems.
Finned tube radiators are commonly applied in various industries such as light manufacturing, construction, machinery, textiles, printing and dyeing, electronics, food processing, pharmaceuticals, metallurgy, and painting. Their applications include hot air heating, air conditioning, cooling, condensation, dehumidification, and drying processes.
Heating radiators are one of the key applications of finned tube radiators, which include both heaters and radiators. These systems are designed to efficiently distribute heat through the use of finned tubes that maximize surface area for better thermal performance.
The structure of a finned tube radiator typically includes a heat dissipation tube bundle, an inlet and outlet manifold, and a supporting frame. The heat dissipation tube itself is composed of a base tube with attached fins, which enhance the heat transfer efficiency. The quality of the heat pipes, their arrangement, and installation method significantly affect the overall performance, including heat transfer effectiveness, air resistance, and thermal expansion capabilities.
Common installation methods for finned tubes include frame-fixed types (such as SRZ, SRL, and S series) and frame-supported types (like GL and U series). Frame-fixed designs involve directly welding the tubes to the frame, making them suitable for temperatures below 180°C. Frame-supported types allow the tubes to pass through perforated plates and are connected via pipes or elbows, ideal for higher temperature applications above 180°C.
Different types of heat pipes are used depending on the application. These include steel heat pipes with galvanized fins, steel-aluminum composite pipes, copper heat pipes with tin-treated surfaces, copper-aluminum composite pipes, and stainless steel heat pipes with high-frequency welded fins. Each type has specific advantages, such as corrosion resistance, thermal conductivity, and durability.
Key technical parameters for finned tube radiators include the heat dissipation area, net cross-sectional area for airflow, and the heat transfer coefficient. The heat dissipation area determines the radiator's capacity and cost, while the net cross-sectional area influences airflow resistance. The heat transfer coefficient affects how effectively heat is exchanged between the fluid and the air.
When selecting a drying radiator, important factors include the heat medium (steam or hot water), the properties of the hot air (flow rate, temperature, humidity), and the material being processed (heat consumption and evaporation rate).
For insulation radiators, considerations include the heat medium, the size of the space, and the required insulation level. Parameters like steam pressure and temperature, hot water flow rate and temperature, and the dimensions of the area are critical in determining the appropriate radiator size and configuration.
This information provides a comprehensive overview of finned tube radiators, their applications, design, and selection criteria. It serves as a valuable reference for engineers, technicians, and industry professionals looking to implement efficient heating and cooling solutions.
By: Hardware Business Network Information Center
http://news.chinawj.com.cn
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