Finned Tube

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Advanced Equipment:

Testing equipments, mainly are followings,22MN water-seal extruding machine introduced from Japan;Roller bright annealing furnace introduced from Germany;Coils drawing machine introduced from Britain;Casting furnaces;Rolling machines and drawing machines;Spectrum analyzer introduced from Switzerland.

Rich Experience:

Persevering in development orientation of"special, innovation, shaped and preciseness", we have accumulated more than 40 years'manufacturing experience and held yearly capability of 16,000 tons.

One-stop servic:

From the begining inquiry and throughout the entire process until you receive the goods. we are dedicated to supporting you every step of the way.

Our certificate:

Guilin lijia has a professional management system, which is certified by iso 9001: 2015, iso 14001: 2015 and ohsas 18001: 2007.

What is Finned Tube

Finned tubes are elongated flat tubes that are made of aluminum cladded carbon steel and are provided with brazed aluminum fins. these tubes are used in a series in heat exchangers. the advantage they offer over ordinary tubes is that the fins offer greater contact with the liquid outside. this quickens the exchange of heat between the liquid inside the tube and the one outside it. with a normal tube, the rate of exchange of heat would be much slower.

Benefits of Finned Tube

Increase Heat Transfer Rate
The fins in a finned tube increase the surface area of contact.this allows it to quicken the heat transfer rate.

Improve Heat Transfer Coefficient
In an ordinary tube,the outer surface area is just about the same or slightly different from the inner surface area.in such a case,the fluid with the lowest heat transfer coefficient will drive the entire heat transfer rate.a finned tube increases the surface area significantly.this is particularly helpful when the heat transfer coefficient of the fluid inside the tube is greater than that of the fluid outside the tube.

Reduces Size of the Equipment and Makes Project Cost Efficient
Finned tubes can significantly increase the surface area.the use of a finned tube can cut down the number of tubes used in an application. this results in a considerable reduction in the size of the equipment. in the long run,this can lead to a decrease in the cost of the project.

What are the Applications of Finned Tube

Oil & Gas Industry Applications

Finned tubes can be found in many applications within the oil & gas industry. they are often used in boilers and furnaces, where their enhanced surface area allows for more effective heat transfer from combustion gases to water or steam. in addition, finned tubes are also commonly used in refinery process heating systems and other high-pressure applications due to their superior strength and durability compared to plain tubing.

Power Generation Industry Applications

Finned tubes are also widely utilized within the power generation industry. they can be found in both coal-fired power plants and nuclear power plants, where they are typically used to cool reactor components by circulating liquid coolant through them. additionally, finned tubes can also be used in gas turbine exhaust systems to reduce noise levels while still maintaining effective cooling performance.

HVAC Industry Applications

Finally, finned tubes can also be found in various hvac applications such as air conditioning systems, refrigeration units, and ventilation systems. the larger surface area provided by the fins allows for greater heat dissipation from hot air streams while still providing efficient airflow through the system. this makes them an ideal choice for many commercial and industrial hvac systems which require high-performance cooling capabilities without sacrificing energy efficiency or noise levels.

Types of Finned Tube

01/

Wound-on I-Fin
This is the most basic type. a strip is wounded on the tube like a helix in a "i" shape.in the basic construction, the contact between tube and fin is achieved by the tension applied during manufacture.loss of pressure contact due to thermal dilatation must be taking into account when selecting this tube type.the most common materials for fins are carbon steel or, in special cases, stainless steel.

02/

L-fin tube
A strip is bended in an "l" shape before wounded over the tube.
here applies the same comment above regarding to temperature limitation to avoid loss of contact pressure between tube and fin. due to this fact, this type of finned tube is used only at moderate temperatures.

03/

Extruded fin
A bare tube, usually of carbon steel (but may be stainless steel or copper alloys) is jacketed by an aluminium tube. the fins are raised by extrusion from this outer tube of aluminium. during the extrusion process, a tight bond is achieved between the extruded aluminium tube and the bare tube.

04/

Extruded fin tube
A bare tube, usually of carbon steel (but may be stainless steel or copper alloys) is jacketed by an aluminium tube. the fins are raised by extrusion from this outer tube of aluminium. during the extrusion process, a tight bond is achieved between the extruded aluminium tube and the bare tube.

The principle of finned tube heat transfer

For example, the hot air curtain for heating or the radiator on the car belong to this A type of heat transfer, that is, the heat of the hot water is transferred through the tube wall to the cold fluid outside the tube—air.It can be seen that the heat transfer process is closely related to the two convective heat transfer processes on both sides of the partition wall.For the above example: the convective heat transfer coefficient on the water side of the tube is about 5000,while theconvective heat transfer coefficient on the air side is about 50,and the difference between the two is 100 times. Due to the heat exchange on the air side the"capacity"is much lower than the water side, which limits the performance of the heat exchange"capacity"of the water side and makes the air the side becomes the"bottleneck"of the heat transfer process,limiting the increase in heat transfer.

Material of Finned Tube

Finned tubes are usually made of four metals-stainless steel, carbon steel, copper and aluminum.

Components of Finned Tube

Tubes:

The core component of the heat exchanger consists of a network of tubes through which one fluid flows, transferring heat to or from another fluid. The material and size of these tubes depend on the application and the properties of the fluids being exchanged.

Fins:

Fins are extended surfaces attached to the outside of the heat exchange tubes. They increase the surface area of the tubes and, as a result, improve heat transfer efficiency. Fins can be of various shapes, including plain, serrated, or corrugated, and are typically made of materials like aluminum or copper.

Tube Sheets:

Tube sheets are typically located at both ends of the heat exchanger and serve to hold and support the tubes. They help to maintain the proper spacing and alignment of the tubes.

Headers:

Headers are the inlet and outlet components of the heat exchanger that connect the tubes to the fluid distribution system. They distribute the fluid evenly across the tubes to ensure efficient heat exchanger.

Process of Finned Tube

The first is the process of applying strip stock to the outside of the tube in a perpendicular to tube configuration. The second is forming or pressing the fins into the tube wall creating extruded shaped fins.The third is to form the tube using dies to create dimples or shapes in the tube wall.

Properties of Cuni

In order to improve the heat exchange efficiency,fins are usually added on the surface of the heat exchange tube to increase the heat exchange.The outer surface area (or inner surface area) of the tube,so as to achieve the purpose of improving the heat exchange efficiency, soThe heat exchange tubes are called finned tubesThe finned tube is used as a heat exchange element and works under high temperature flue gas conditions for a long time,such as a pot The finned tubes for furnace heat exchangers are used in harsh environments,high temperature and pressure,and corrosive atmosphere.

How To Maintain Finned Tube

1.Regularly check whether the finned tube Wuxi cleaning is perfect, whether there are deposits,coking, water rust layer and other scale attached,and instantly clean. In this at the same time must also check each fin tube and rubber gasket bonding is tight,the rubber gasket itself is intact,so as to avoid rubber gasket degumming and damage caused by the leakage.

2.Plate heat exchanger compression nuts and upper and lower guide rods, should often be lubricated with lubricating grease.

3.Each instrument adjustment should be responsible for a person, and strictly implement the operating procedures for operation and maintenance.

4.Each time the finned tube is re-clamped, pay attention to the scale position of the last clamp, do not over-press the rubber gasket to reduce the service life of the gasket.

certificate

Guilin Lijia has a professional management system, which is certified by ISO 9001: 2015, ISO 14001: 2015 and OHSAS 18001: 2007.

Factory pictures

Guilin lijia metals co., ltd, established in 1976, is a key enterprise of copper fabrication in guangxi, china. our enterprise, as a key exporting enterprise in guangxi, is the council member of china nonferrous metals association. we are located in tieshan industrial park of guilin high and new technology industrial development district.

FAQ

Q: What are the materials used in fins in heat transfer?

A: Commonly used materials for fins include aluminium, copper, and steel. The fluid properties, including the flow rate and temperature, also play a crucial role in determining the effectiveness of the fins in heat transfer.

Q: What is finned tube heat exchanger?

A: Finned tubes are the main components of heat exchangers. They are a series of tubes where fins have been added on the outside to increase the contact area with the outside fluid, to exchange heat and between the fluid inside the tube and the fluid outside the tube.

Q: What are the fins of shell and tube heat exchanger?

A: Single tubes and special fins are built together in one robust cooler bundle. This construction, together with optimized tolerances, produces a highly efficient and compact heat exchanger – up to 75% smaller than a conventional tubular heat exchanger with plain tubes.

Q: How are finned tubes made?

A: Currently, the production of finned tubes used shielded welding consumable electrode active gas (MAG) and welding with a laser beam, which has contributed to a significant increase in the efficiency of the production process. Another variation is to connect pipes with fins welded high-frequency currents.

Q: What are finned tubes and their types?

A: Finned tubes are elongated flat tubes that are made of aluminum cladded carbon steel and are provided with brazed aluminum fins. These tubes are used in a series in heat exchangers. The advantage they offer over ordinary tubes is that the fins offer greater contact with the liquid outside.

Q: What is the difference between bare tube and finned tube?

A: In the difference between finned tube and bare tube usage is: by using finned tubes required tube quantity on heat exchanger can be reduced up to 1/6. So finned tubes can reduce the equipment cost and also equipment sizes.

Q: What are the materials used in fins?

A: Three key fin materials are offered: the standard being natural aluminium, a pre-coated aluminium called “Blue Fin”, and copper. “Blue Fin” offers a further level of resistance to environmental conditions, with copper offering the best possible protection.

Q: What is the best material for fins?

A: Fiberglass fins or a combination of fiberglass and carbon fiber usually results in the best overall performance. Fiberglass fins are stiff and provide a lot of hold and drive which makes it good for big waves or for powerful surfers.

Q: What is the best material for heat fins?

A: Copper is one of the best materials to choose for heat sinks as it has a high thermal conductivity. But aluminum is most commonly used due to it's lower cost and relatively high thermal conductivity.

Q: What are the fins on a finned tube coil?

A: The fins on a coil accomplish two major functions: they straighten the air out as it comes in contact with the entering-air side of the coil, and they perform some of the heat transfer.

Q: What are the advantages of finned tube?

A: Integral finned tubes have the advantages of high thermal conductivity, uniform heat dissipation, and long service life. They are mainly used in heating furnaces and industrial kiln furnaces or heat exchangers.

Q: What is a finned tube coil?

A: Finned tube coils transfer heat energy from a steam or liquid (inside the tubes) into air (across the fins) or vice versa. We produce finned tube coils from one off small applications to much larger commercial and industrial projects.

Q: What is the purpose of the fins in a heat exchanger?

A: Why are Fins Important for Heat Transfer? According to the fin definition from Wikipedia: “In the study of heat transfer, fins are surfaces that extend from an object to increase the rate of heat transfer to or from the environment by increasing convection.

Q: Why fins are used in heat exchanger?

A: Fins are extensions on exterior surfaces of objects that increase the rate of heat transfer to or from the object by increasing convection. This is achieved by increasing the surface area of the body, which in turn increases the heat transfer rate by a sufficient degree.

Q: What are the roles of fins in most heat exchanger?

A: This is primarily because fins are used for increasing the surface area for convection heat transfer. From a heat transfer perspective, the fin thickness is chosen the thinnest and is of secondary importance for industrial heat exchangers because of the limited range of permissible fin sizes [2].

Q: What is finned tube evaporator?

A: Finned evaporators are bare tube evaporators that have been coated with fins. When the chilled fluid (air or water) passes through a bare tube evaporator, most of the refrigerant's chilling action is lost since there is less surface area for heat transfer from the fluid to the refrigerant.

Q: What is the difference between bare tube and finned tube?

Q: Why is the main purpose of the fins on finned tube evaporators?

A: The fins on a coil accomplish two major functions: they straighten the air out as it comes in contact with the entering-air side of the coil, and they perform some of the heat transfer.

Q: Why are finned surfaces frequently used in practice?

A: 14-53C Finned surfaces are frequently used in practice to enhance heat transfer by providing a larger heat transfer surface area.

Q: What are finned tubes made of?

A: Finned tubes are usually made of four metals – stainless steel, carbon steel, copper and aluminum. Each metal has specific properties; as a result, finned tubes made of these materials have specific roles to play.

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