Inlaid G-shaped finned tube-aluminum tape wound copper tube

Classification and Concept of G‑Type Finned Tubes: To enhance heat transfer efficiency, fins are typically added to the surface of heat exchange tubes. G‑type finned tubes increase the total surface area (or internal surface area) of the tube, thereby improving heat transfer performance. Such heat exchange tubes are referred to as G‑type finned tubes. Based on their shape and structure, G‑type finned tubes can be categorized into square finned tubes, helical finned tubes, longitudinal finned tubes, helical serrated finned tubes, and internally finned tubes.

Classification and Concept of G‑Type Finned Tubes: To enhance heat transfer efficiency, fins are typically added to the surface of heat exchange tubes. G‑type finned tubes increase the total surface area (or internal surface area) of the tube, thereby improving heat transfer performance. Such heat exchangers are referred to as G‑type finned tubes. Based on their shape and structure, G‑type finned tubes can be categorized into square finned tubes, helical finned tubes, longitudinal finned tubes, helical serrated finned tubes, and internally finned tubes. According to material, they are classified as single‑metal finned tubes and bimetallic composite finned tubes; and depending on the manufacturing process, they are further divided into rolled finned tubes, welded finned tubes, rolled‑and‑welded finned tubes, and nested finned tubes. 
G‑type finned tubes are heat‑exchange components attached to the outer surface of heat‑transfer tubes. These fins enhance heat transfer by increasing the effective surface area, thereby improving thermal performance. Since finned tubes are installed in boilers and other equipment that operate under sustained high‑temperature conditions, it is essential to select models with superior characteristics. 1. The finned tubes exhibit excellent corrosion resistance. If the selected tubes lack adequate corrosion resistance, they will readily degrade under prolonged exposure to high temperatures. 2. They also possess outstanding wear resistance. Wear on the fins can adversely affect heat‑transfer efficiency; therefore, choosing tubes with strong abrasion resistance is critical. 3. G‑type finned tubes feature low contact thermal resistance. Only by selecting tubes with low contact thermal resistance can their performance be maintained under continuous high‑temperature operation. 4. The tubes demonstrate robust stability. Only stable finned tubes will ensure consistent heat‑transfer performance even under sustained high‑temperature conditions. 5. The tubes offer effective ash‑resistance. 
G‑type finned tube installation is simple and cost‑effective, with significantly fewer connection points, making assembly more economical and efficient. This also reduces the likelihood of connector leaks, while product maintenance is straightforward and convenient—requiring virtually no upkeep after assembly. 
After a G‑type finned tube absorbs solar radiation, the temperature difference between the fin tip and base becomes significant, leading to an increase in the average fin temperature and a reduction in the driving temperature difference for heat transfer with the surroundings—conditions that are unfavorable for capturing solar energy. As fin height increases, convective heat transfer initially rises and then declines, reaching a maximum; thus, a greater fin height is not always advantageous. When both fin height and solar irradiance are high, the fins may begin to radiate heat to the environment; in such cases, a lower convective heat transfer coefficient can help enhance the overall heat transfer rate. Given the fluid temperature inside the tube and the heat transfer coefficient, a theoretical model of a single G‑type finned tube in another collector/evaporator is established, from which analytical expressions for the temperature distribution and the heat transfer rate are derived.

• G型翅片管