1. Introduction
In modern industrial heat exchange systems, the demand for high-efficiency, reliable, and cost-effective heat transfer elements continues to grow, driven by the goals of energy conservation, emission reduction, and industrial upgrading. Finned tubes, as core components that enhance heat transfer by expanding the heat transfer area, are widely used in various industrial fields. Among them, single-metal finned tubes have gained increasing attention due to their unique structural and performance advantages—homogeneous material composition ensures excellent compatibility between the base tube and fins, avoiding interface detachment, thermal resistance increase, and corrosion failure caused by material mismatch, which are common issues in bimetallic finned tubes.
Single-metal finned tubes are defined as finned tubes where both the base tube and fins are fabricated from the same metallic material, forming an integral structure through specialized manufacturing processes. This structural design not only simplifies the manufacturing process but also ensures uniform thermal conductivity throughout the component, as there is no interface between different materials to impede heat transfer. The heat transfer efficiency of single-metal finned tubes is closely related to their material properties, structural design, and manufacturing precision—materials with high thermal conductivity (such as copper and aluminum) are suitable for low-temperature heat exchange scenarios, while materials with high-temperature resistance and corrosion resistance (such as stainless steel and nickel-based alloys) are preferred for harsh working environments.
Compared with bimetallic finned tubes, single-metal finned tubes offer distinct advantages: simplified manufacturing, lower production costs, superior structural integrity, and easier maintenance. However, their performance is highly dependent on the selected material, requiring careful matching with the working conditions of the heat exchange system. With the continuous development of manufacturing technologies and material science, single-metal finned tubes have been optimized in terms of structure, process, and performance, expanding their application scope to more complex and harsh industrial scenarios.
This paper focuses on the core knowledge of single-metal finned tubes, systematically elaborating on their heat transfer principles, structural characteristics, manufacturing processes, application scenarios, and selection methods. By integrating industry standards, practical engineering experience, and the latest technical developments, this paper aims to provide comprehensive and professional technical support for relevant practitioners, helping them grasp the key technologies of single-metal finned tubes and promote their rational application in industrial heat exchange systems.
2. Fundamental Principles of Single-Metal Finned Tubes
The core function of single-metal finned tubes is to enhance heat transfer efficiency by expanding the effective heat transfer area of the base tube, while leveraging the homogeneous material properties to ensure stable and efficient heat conduction. The working principle of single-metal finned tubes involves two key aspects: heat transfer mechanism and structural design principles, both of which are closely related to the material properties of the selected metal.
2.1 Heat Transfer Mechanism
The heat transfer process of single-metal finned tubes mainly includes three stages: heat conduction from the fluid inside the base tube to the tube wall, heat conduction from the base tube wall to the fins, and heat convection from the fin surface to the external fluid. Unlike bimetallic finned tubes, single-metal finned tubes eliminate the contact thermal resistance between the base tube and fins, as they are made of the same material and form an integral structure. This homogeneous structure ensures that heat is conducted smoothly from the base tube to the fins without significant energy loss, thereby improving the overall heat transfer efficiency.
Another key factor affecting the heat transfer efficiency of single-metal finned tubes is the fin efficiency $$\eta_f$$, which refers to the ratio of the actual heat transfer rate of the fin to the ideal heat transfer rate (assuming the entire fin surface is at the base temperature). The fin efficiency is affected by the fin height, thickness, thermal conductivity of the material, and the convective heat transfer coefficient of the external fluid. For single-metal finned tubes, materials with high thermal conductivity (such as copper and aluminum) can achieve higher fin efficiency, while materials with lower thermal conductivity (such as carbon steel) require optimized fin design (e.g., reduced fin height, increased fin thickness) to ensure effective heat transfer.
2.2 Structural Characteristics
Single-metal finned tubes have a simple and integral structure, consisting of a base tube and integrally formed or welded fins. The structural design of the fins directly affects the heat transfer area, fluid resistance, and heat transfer efficiency. Common fin types for single-metal finned tubes include spiral fins, straight fins, serrated fins, corrugated fins, and variable-pitch fins, which are similar to those of conventional finned tubes but are fabricated from the same material as the base tube.
- Base Tube: The base tube is the core part of the single-metal finned tube, responsible for carrying the internal fluid and transferring heat to the fins. The diameter, wall thickness, and material of the base tube are selected according to the working pressure, temperature, and corrosive environment of the heat exchange system. Common base tube diameters range from 10mm to 150mm, and wall thicknesses range from 1mm to 10mm, depending on the application scenario.
- Fins: Fins are the key components that expand the heat transfer area. They are integrally connected to the base tube, ensuring no interface gaps. The fin height, thickness, pitch, and type are optimized according to the heat transfer requirements and fluid characteristics. For example, spiral fins are suitable for high-velocity fluids, as they enhance fluid turbulence and reduce boundary layer thickness; serrated fins are suitable for high-heat-flux scenarios, as they break the fluid boundary layer and improve heat transfer efficiency.
- Integral Structure Advantage: The homogeneous and integral structure of single-metal finned tubes ensures superior structural stability, avoiding fin detachment caused by thermal expansion and contraction, vibration, or corrosion—problems that often occur in bimetallic finned tubes due to material mismatch. This integral structure also simplifies maintenance, as there is no need to inspect or repair the interface between the base tube and fins.
2.3 Material-Dependent Performance
The performance of single-metal finned tubes is highly dependent on the selected metallic material, as the material determines the thermal conductivity, high-temperature resistance, corrosion resistance, mechanical strength, and cost of the finned tube. Common materials used for single-metal finned tubes include carbon steel, stainless steel, aluminum, copper, and nickel-based alloys, each with distinct performance characteristics and applicable scenarios.
- Carbon Steel: Low cost, good mechanical strength, and easy manufacturing. Thermal conductivity is moderate (about 45 W/(m·K)). Suitable for low-to-medium temperature (below 450℃), low-to-medium pressure, and non-corrosive or slightly corrosive working environments, such as ordinary industrial boilers, waste heat recovery pipelines, and air-cooled condensers. Disadvantage: poor high-temperature oxidation resistance and corrosion resistance, requiring anti-corrosion treatment (e.g., galvanizing, painting) in corrosive environments.
- Stainless Steel: Excellent corrosion resistance, high-temperature oxidation resistance, and mechanical strength. Thermal conductivity is lower than carbon steel (about 15-25 W/(m·K) for austenitic stainless steel). Suitable for high-temperature (up to 800℃), high-pressure, and strong corrosive working environments, such as nuclear power plant heat exchangers, chemical corrosion-resistant heat exchangers, and marine heat exchange systems. Common types include 304, 316L, 321, and 310S stainless steel.
- Aluminum: High thermal conductivity (about 237 W/(m·K)), light weight, low cost, and good corrosion resistance (natural oxide film). Suitable for low-temperature (below 200℃) heat exchange scenarios, such as refrigeration and air conditioning, automotive radiators, and low-temperature waste heat recovery systems. Disadvantage: low mechanical strength and poor high-temperature resistance, not suitable for high-temperature and high-pressure environments.
- Copper: Excellent thermal conductivity (about 401 W/(m·K)), good corrosion resistance, and high mechanical strength. Suitable for low-to-medium temperature (below 300℃) heat exchange scenarios, such as refrigeration and air conditioning, cold storage, cryogenic equipment, and marine heat exchangers. Disadvantage: high cost, limiting its application in large-scale industrial scenarios.
- Nickel-Based Alloys: Superior high-temperature resistance (up to 1200℃), corrosion resistance, and creep resistance. Thermal conductivity is moderate (about 10-20 W/(m·K)). Suitable for extremely harsh working environments, such as petrochemical high-temperature reactors, thermal power plant superheaters, and nuclear power plant heat exchangers. Disadvantage: very high cost, used only in high-demand scenarios.
3. Manufacturing Processes of Single-Metal Finned Tubes
The manufacturing process of single-metal finned tubes is crucial to ensuring their structural integrity, heat transfer performance, and service life. The core requirement of the manufacturing process is to achieve an integral connection between the base tube and fins, eliminating interface gaps and ensuring uniform material distribution. Common manufacturing processes for single-metal finned tubes include extrusion, rolling, high-frequency welding, stamping, and casting, each with distinct technical characteristics, applicable materials, and production efficiency.
3.1 Extrusion Process
The extrusion process is mainly used for manufacturing single-metal finned tubes with soft metals, such as aluminum and copper. The process involves heating the base tube blank to a suitable temperature (below the melting point, in the plastic deformation range), then extruding the tube blank through a specialized die to form integral fins on the outer surface. The extrusion process can produce finned tubes with dense fins, uniform dimensions, and excellent structural integrity, as the fins are formed directly from the base tube material without additional welding or bonding.
Key advantages of the extrusion process: high fin density, good surface quality, no interface between fins and base tube, and high production efficiency for mass production. Disadvantages: limited to soft metals (aluminum, copper), high die cost, and difficulty in producing large-diameter or thick-walled finned tubes. Common applications: aluminum finned tubes for air conditioners, copper finned tubes for refrigeration equipment.
3.2 Rolling Process
The rolling process is suitable for manufacturing single-metal finned tubes with medium-hard metals, such as carbon steel and stainless steel. The process involves passing the base tube and a fin strip (of the same material) through a pair of rolling rollers, which apply pressure to deform the fin strip and wrap it around the base tube, forming an integral connection. The rolling process can be divided into spiral rolling and straight rolling, depending on the fin arrangement.
Key advantages of the rolling process: wide applicability to materials (carbon steel, stainless steel, aluminum, copper), low production cost, and ability to produce finned tubes with different fin types (spiral, straight). Disadvantages: fin thickness and height are limited, and the bonding strength between fins and base tube is lower than that of extrusion or welding processes. Common applications: carbon steel spiral finned tubes for waste heat recovery, stainless steel straight finned tubes for low-pressure heat exchangers.
3.3 High-Frequency Welding Process
The high-frequency welding process is the most widely used manufacturing process for single-metal finned tubes, suitable for all common materials (carbon steel, stainless steel, aluminum, copper). The process leverages the skin effect and proximity effect of high-frequency current to rapidly heat the contact interface between the base tube and fin strip (of the same material) to the melting point, then applies pressure to form a metallurgical bond. This process ensures a dense and continuous weld seam, achieving an integral connection between the fins and base tube.
Key advantages of the high-frequency welding process: high production efficiency, uniform welding quality, strong adaptability to materials and fin types, and ability to produce finned tubes with large fin height and thickness. Disadvantages: higher equipment cost than rolling process, and requires strict control of welding parameters to avoid welding defects (e.g., incomplete fusion, cracks). Common applications: stainless steel spiral finned tubes for petrochemical heat exchangers, carbon steel serrated finned tubes for power plant boilers.
3.4 Stamping Process
The stamping process is mainly used for manufacturing single-metal finned tubes with thin fins, such as aluminum and copper finned tubes for small heat exchangers. The process involves stamping a metal sheet (of the same material as the base tube) into fin shapes, then attaching the fins to the base tube through mechanical clamping or spot welding. The stamping process is suitable for producing finned tubes with complex fin shapes (e.g., corrugated fins, serrated fins) and small sizes.
Key advantages of the stamping process: low production cost, high flexibility in fin design, and suitability for small-batch production. Disadvantages: lower structural integrity than extrusion or welding processes, and limited to thin fins and soft metals. Common applications: aluminum corrugated finned tubes for household air conditioners, copper serrated finned tubes for small refrigeration equipment.
3.5 Casting Process
The casting process is used for manufacturing single-metal finned tubes with high-temperature resistant materials, such as nickel-based alloys. The process involves melting the metal material, pouring it into a mold with the desired finned tube shape, and cooling it to form an integral finned tube. The casting process can produce finned tubes with complex structures and large sizes, suitable for extremely harsh working environments.
Key advantages of the casting process: ability to produce large-size and complex-structure finned tubes, suitable for high-temperature resistant materials. Disadvantages: low production efficiency, high cost, and potential casting defects (e.g., pores, cracks) that affect performance. Common applications: nickel-based alloy finned tubes for high-temperature waste heat recovery, stainless steel cast finned tubes for nuclear power plant heat exchangers.
3.6 Quality Control in Manufacturing
Regardless of the manufacturing process, strict quality control is essential to ensure the performance of single-metal finned tubes. Key quality control links include: material inspection (chemical composition, mechanical properties, thermal conductivity), dimensional inspection (base tube diameter, wall thickness, fin height, fin pitch, straightness), structural inspection (interface bonding strength, fin integrity, no cracks or pores), and performance testing (heat transfer efficiency, corrosion resistance, mechanical strength). Industry standards such as GB/T 15386-2017 and ASTM A179/A179M provide clear requirements for the quality of single-metal finned tubes.
4. Applications of Single-Metal Finned Tubes
Single-metal finned tubes, with their integral structure, material-dependent performance advantages, and simplified manufacturing, are widely used in various industrial fields that require efficient heat transfer. Their application scope covers petrochemical, power generation, refrigeration and air conditioning, metallurgy, marine engineering, and food processing industries, with specific application scenarios tailored to the material and structural characteristics of the finned tubes.
4.1 Petrochemical Industry
The petrochemical industry involves numerous high-temperature, high-pressure, and corrosive heat exchange processes, requiring heat transfer elements with superior corrosion resistance, structural stability, and heat transfer efficiency. Single-metal finned tubes made of stainless steel or nickel-based alloys are widely used in reactors, heat exchangers, condensers, and waste heat recovery systems.
- Heat Exchangers: In catalytic cracking, hydrogenation, and refining processes, stainless steel single-metal finned tubes (e.g., 316L, 310S) are used as core heat transfer components. Their excellent corrosion resistance allows them to withstand corrosive process fluids and flue gases, while the integral structure ensures no fin detachment under high vibration and thermal shock. For example, in a catalytic cracking unit, stainless steel spiral finned tubes are used in the flue gas heat exchanger, achieving a heat transfer efficiency improvement of 25-35% compared to smooth tubes.
- Waste Heat Recovery: High-temperature flue gas (500-800℃) generated in petrochemical production is recovered using nickel-based alloy or stainless steel single-metal finned tubes. These finned tubes can withstand high temperatures and corrosive flue gases, ensuring long-term stable operation. For example, a large petrochemical refinery uses nickel-based alloy single-metal finned tubes in its flue gas waste heat recovery boiler, achieving a waste heat recovery efficiency of over 75% and annual energy savings of 10,000 tons of standard coal.
4.2 Power Generation Industry
The power generation industry (thermal power, nuclear power, biomass power) requires heat transfer elements with high-temperature resistance, high-pressure resistance, and high reliability. Single-metal finned tubes made of carbon steel, alloy steel, and stainless steel are widely used in boilers, superheaters, economizers, and air preheaters.
- Thermal Power Plant Boilers: Carbon steel or alloy steel single-metal finned tubes are used in economizers and air preheaters to recover flue gas waste heat, improving boiler efficiency. For example, in a 600MW thermal power plant, carbon steel spiral finned tubes are used in the economizer, increasing the heat transfer area by 3-5 times compared to smooth tubes and improving boiler efficiency by 2-3%. High-temperature alloy steel single-metal finned tubes are used in superheaters to withstand high temperatures (up to 650℃) and high pressures, ensuring stable steam production.
- Nuclear Power Plant Heat Exchangers: Stainless steel single-metal finned tubes (e.g., 321, 316L) are used in primary and secondary circuit heat exchangers, leveraging their excellent corrosion resistance and radiation resistance to ensure safe and stable operation. The integral structure of single-metal finned tubes avoids interface defects, reducing the risk of leakage in high-pressure nuclear power systems.
4.3 Refrigeration and Air Conditioning Industry
The refrigeration and air conditioning industry requires heat transfer elements with high thermal conductivity, light weight, and compact structure. Single-metal finned tubes made of aluminum and copper are widely used in air conditioners, refrigerators, cold storage, and cryogenic equipment.
- Air Conditioners: Aluminum single-metal finned tubes (extruded or stamped) are used in evaporators and condensers of central and household air conditioners. Their high thermal conductivity and light weight reduce the volume and energy consumption of air conditioners. For example, extruded aluminum spiral finned tubes are used in central air conditioning condensers, improving heat transfer efficiency by 15-25% compared to traditional finned tubes and increasing the energy efficiency ratio by 10-12%.
- Cold Storage and Cryogenic Equipment: Copper single-metal finned tubes are used in evaporators of cold storage and cryogenic equipment, leveraging their excellent thermal conductivity and low-temperature performance to ensure efficient refrigeration. The integral structure of copper finned tubes avoids fin detachment in low-temperature and humid environments, extending service life.
4.4 Metallurgical Industry
The metallurgical industry generates large amounts of high-temperature waste heat during smelting processes, with harsh working conditions (high temperature, high dust, corrosive flue gas). Single-metal finned tubes made of carbon steel, stainless steel, and high-temperature alloy steel are widely used in waste heat recovery and equipment cooling systems.
- Waste Heat Recovery: Carbon steel or stainless steel single-metal finned tubes are used in blast furnace, converter, and electric furnace flue gas waste heat recovery boilers. For example, high-temperature alloy steel single-metal finned tubes are used in blast furnace flue gas waste heat recovery systems, withstanding temperatures up to 1000℃ and dust wear, achieving a waste heat recovery efficiency of over 65%.
- Equipment Cooling: Carbon steel single-metal finned tubes are used in cooling systems of metallurgical equipment (e.g., blast furnace cooling walls, converter cooling pipes), transferring heat from the equipment to cooling water. The integral structure ensures structural stability under high vibration and thermal shock, avoiding fin detachment and equipment failure.
4.5 Other Application Fields
In addition to the above fields, single-metal finned tubes are also widely used in marine engineering, automotive industry, and food processing:
- Marine Engineering: Stainless steel or copper single-metal finned tubes are used in marine heat exchangers (e.g., seawater cooling heat exchangers, marine boiler heat exchangers), resisting seawater corrosion and ensuring the normal operation of marine equipment. The compact integral structure is suitable for the limited space of marine vessels.
- Automotive Industry: Aluminum single-metal finned tubes are used in automotive radiators, intercoolers, and exhaust heat recovery systems, leveraging their light weight and high thermal conductivity to improve engine cooling efficiency and energy utilization. For example, extruded aluminum straight finned tubes are used in automotive radiators, reducing weight by 30% compared to traditional steel radiators.
- Food Processing: Stainless steel single-metal finned tubes are used in heat exchangers for beverage sterilization, food drying, and refrigeration, ensuring food safety and hygiene. Their corrosion resistance and easy cleaning make them suitable for food processing environments.
5. Selection of Single-Metal Finned Tubes
The rational selection of single-metal finned tubes is crucial to ensuring the efficiency, stability, and economy of heat exchange systems. The selection process should comprehensively consider material properties, working conditions, heat transfer requirements, manufacturing processes, and economic factors, following a systematic framework to match the finned tube characteristics with the actual application scenarios.
5.1 Selection Principles
- Material Matching Principle: The material of the single-metal finned tube should be matched with the working temperature, pressure, and corrosive medium of the heat exchange system. For example, high-temperature and corrosive scenarios require stainless steel or nickel-based alloys; low-temperature scenarios can use aluminum or copper; low-cost, non-corrosive scenarios can use carbon steel.
- Heat Transfer Efficiency Principle: The fin type, height, thickness, and pitch should be optimized according to the heat transfer requirements and fluid characteristics. For high-velocity fluids, spiral or serrated fins are preferred; for high-heat-flux scenarios, serrated or corrugated fins are suitable; for low-velocity fluids, straight fins can be used to reduce fluid resistance.
- Structural Stability Principle: The manufacturing process should be selected based on the material and application scenario to ensure structural integrity. For example, soft metals (aluminum, copper) can use extrusion or stamping; hard metals (carbon steel, stainless steel) can use high-frequency welding or rolling; high-temperature resistant materials (nickel-based alloys) can use casting.
- Economic Principle: Under the premise of meeting performance requirements, the most cost-effective material and manufacturing process should be selected. For example, carbon steel is preferred for ordinary industrial scenarios; stainless steel or nickel-based alloys are used only when high corrosion resistance or high-temperature resistance is required.
5.2 Key Selection Factors
5.2.1 Working Conditions
Working conditions are the core factors affecting the selection of single-metal finned tubes, including working temperature, pressure, corrosive medium, and fluid characteristics:
- Working Temperature: Low temperature (below 200℃): aluminum, copper; medium temperature (200-450℃): carbon steel, ordinary stainless steel; high temperature (above 450℃): high-temperature alloy steel, stainless steel (310S), nickel-based alloys.
- Working Pressure: Low pressure (below 1MPa): thin-walled base tube, rolling or stamping process; medium pressure (1-10MPa): medium-walled base tube, high-frequency welding process; high pressure (above 10MPa): thick-walled base tube, extrusion or casting process.
- Corrosive Medium: Non-corrosive (air, water): carbon steel, aluminum; slightly corrosive (weak acid, weak alkali): 304 stainless steel; strongly corrosive (strong acid, seawater): 316L stainless steel, nickel-based alloys; high-temperature corrosive flue gas: 310S stainless steel, nickel-based alloys.
- Fluid Characteristics: High-velocity fluid (gas, high-pressure liquid): spiral, serrated fins; low-velocity fluid (low-pressure liquid): straight fins; viscous fluid: variable-pitch fins to reduce fluid resistance.
5.2.2 Heat Transfer Requirements
Heat transfer requirements include heat transfer rate, heat transfer coefficient, and heat transfer area. The selection of fin type and dimensions should be based on these requirements:
- High Heat Transfer Rate: Select high thermal conductivity materials (aluminum, copper) and high-efficiency fin types (serrated, corrugated fins), increase fin height and density.
- Low Fluid Resistance: Select straight fins or large-pitch spiral fins, reduce fin height and density.
- Limited Space: Select compact fin types (high-density spiral fins), thin-walled base tube, and lightweight materials (aluminum).
5.2.3 Manufacturing and Economic Factors
Manufacturing factors include production efficiency, process maturity, and equipment availability. Economic factors include material cost, manufacturing cost, and maintenance cost:
- Mass Production: Select high-efficiency processes (extrusion, high-frequency welding) and low-cost materials (carbon steel, aluminum).
- Small-Batch Production: Select flexible processes (stamping, rolling) to reduce die or equipment costs.
- Long Service Life: Select corrosion-resistant materials (stainless steel, nickel-based alloys) to reduce maintenance costs, even if the initial cost is higher.
5.3 Selection Framework and Examples
The selection of single-metal finned tubes can be divided into four steps: 1) Determine working conditions (temperature, pressure, corrosive medium, fluid characteristics); 2) Select material based on working conditions; 3) Select fin type and dimensions based on heat transfer requirements; 4) Select manufacturing process based on material and production scale. Below are typical application examples to illustrate the selection process:
- Example 1: Central Air Conditioning Condenser: Working conditions: temperature 5-50℃, pressure 1-2MPa, fluid (refrigerant, air), non-corrosive. Selection: Material (aluminum, high thermal conductivity, light weight); Fin type (spiral fin, high heat transfer efficiency); Manufacturing process (extrusion, mass production, low cost).
- Example 2: Petrochemical Flue Gas Heat Exchanger: Working conditions: temperature 500-700℃, pressure 3-5MPa, fluid (corrosive flue gas). Selection: Material (316L stainless steel, corrosion-resistant, high-temperature resistant); Fin type (serrated fin, high heat transfer efficiency, anti-dust accumulation); Manufacturing process (high-frequency welding, high production efficiency, good structural integrity).
- Example 3: Nuclear Power Plant Heat Exchanger: Working conditions: temperature 300-400℃, pressure 10-15MPa, fluid (corrosive coolant), radiation environment. Selection: Material (321 stainless steel, corrosion-resistant, radiation-resistant); Fin type (straight fin, low fluid resistance); Manufacturing process (casting, high structural stability, no interface defects).
6. Technical Development Trends and Conclusion
6.1 Technical Development Trends
With the continuous development of material science and manufacturing technology, single-metal finned tubes are developing towards high efficiency, high performance, intelligence, and lightweight, to meet the growing demand for energy conservation and emission reduction in industrial production:
- High-Efficiency Heat Transfer Technology: Optimize fin structure (e.g., micro-fins, variable-pitch serrated fins) and surface modification (e.g., nano-coating, surface texturing) to improve heat transfer efficiency. For example, micro-fins on aluminum single-metal finned tubes can increase heat transfer area by 50% or more, improving heat transfer efficiency by 20-30%.
- Advanced Material Development: Develop new high-performance single metals, such as high-strength aluminum alloys, corrosion-resistant stainless steel, and high-temperature nickel-based alloys, to expand the application scope of single-metal finned tubes in harsh environments. For example, new duplex stainless steel single-metal finned tubes have both high corrosion resistance and high mechanical strength, suitable for offshore oil and gas heat exchange systems.
- Intelligent Manufacturing: Integrate 3D printing, robot welding, and automatic parameter control into the manufacturing process, improving production precision and efficiency. For example, 3D printing technology can produce single-metal finned tubes with complex fin structures, meeting customized heat transfer requirements.
- Lightweight and Compact Design: Optimize the structural design of fins and base tubes, using thin-walled materials and high-density fins to reduce weight and volume, suitable for equipment with limited space (e.g., aerospace, automotive, marine equipment).
6.2 Conclusion
Single-metal finned tubes, as integral high-efficiency heat transfer elements, have unique advantages of structural integrity, uniform thermal conductivity, simplified manufacturing, and cost-effectiveness, making them an important choice for industrial heat exchange systems. Their performance is highly dependent on material properties, structural design, and manufacturing processes, and rational selection
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