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Heat transfer efficiency and smoothness of spiral finned tubes
2022 / 07 / 25
The spiral finned tube is very efficient in heat exchange, and to a certain extent, the heat dissipation area is very large, so it can be applied to a wide range of jobs. The finned tube has a longer service life, and the spiral finned tube uses the high-frequency power supply as the main heat source. The spiral finned tube has a very good heat transfer efficiency. If it is compared with other finned tube products, its heat transfer efficiency should be considered high. The efficiency is about four times higher. For the integral spiral finned tube, the entire fins are integrally rolled with the base tube, but other ordinary finned tubes are directly welded to the surface of the base tube. Therefore, on the welded joint surface, The phenomenon of thermal resistance is relatively easy and often occurs, resulting in a serious impact on the effect of heat transfer. Because the overall spiral finned tube is better than the ordinary finned tube in the ability to resist dust accumulation, because of its high-quality performance characteristics, the effect of use has been significantly improved and improved. In the process of production, it is mainly produced by rolling with multiple rollers. It has relatively high smoothness on the surface, and the overall density of the structure is also very high. The gap between the fin tube and the base tube is The height is relatively natural, so its anti-corrosion performance has been significantly improved. The advantage of the spiral finned tube is to increase the heat exchange area wi
How to check and maintain the fault of electric heating reactor?
2022 / 07 / 18
Maintenance and Troubleshooting Maintenance of Electric Heating Reactor: 1. The electric heating reaction kettle should be operated and used strictly according to the working pressure and working temperature calibrated on the product nameplate to avoid danger. 2. The electric heating reactor strictly abides by the regulations on cooling and oil injection in the product instruction manual, and does a good job in the maintenance and maintenance of the equipment. 3. When all valves of the electric heating reactor are used, the valve stem (needle) should be slowly rotated to press the cover tightly to achieve the sealing effect. Do not use excessive force when closing, so as not to damage the sealing surface. 4. The electrical control instrument of the electric heating reactor should be operated by special personnel, and overload protection facilities should be set up according to regulations. Troubleshooting of Electric Heating Reactor: 1. When there is leakage at the sealing surface, re-tighten the screw, and re-grind and polish the sealing surface. 2. Repair and replace the valve stem (needle) and valve port when there is leakage at the valve. 3. The outer magnet rotates, but the inner magnet does not rotate. When the motor current decreases, notify the supplier and replace the inner magnet. 4. When there is friction noise in th
The working principle and application of finned tube
2022 / 07 / 18
Application of finned tubes The application of finned tubes is now very extensive. Its main purpose is heat exchange, so it is mainly installed on the surface of the heat exchange tube to improve the heat exchange efficiency. However, for the finned tube, there are still certain requirements for its performance, mainly including wear resistance, stability, etc., especially when used in harsh environments, its performance requirements are better, and it also has low contact thermal resistance. and good dust resistance. What principles should we follow when we use finned tubes for heat transfer? (1) If the heat transfer coefficients on both sides of the tube are very different, the finned tube should be installed on the smaller side. (2) If the heat transfer coefficient on both sides of the tube is small, the finned tube can be installed on both sides, but do not install only one side, it will not be effective. (3) If the heat transfer coefficient on both sides of the tube is large, do not install finned tubes. The previous spiral plate heat exchanger was difficult to clean, the structure was too compact, and the tools were not very convenient to use. A detachable device that has been developSed now is easy to clean and all parameters are the same as those of the non-detachable device. At present, this detachable technology has not been promoted, and many manufacturers do not know that there is such a method. But as long as the customer who has the blockage problem can use this equipment to solve the problem, because i
Application of Laser Welding Finned Tubes in Heat Exchangers
2022 / 07 / 18
The heat exchanger is the key equipment of the thermal system, and the laser welded finned tube is an important part of the heat exchanger. For example, the tube-fin heat exchanger is a heat exchanger structure with high technical content and complex production process. The cold and hot fluid walls are cross-flow heat exchange, and the outside of the tube is filled with refrigerant and air. The main body of the tube is phase change heat transfer. The tubes are generally arranged in a serpentine shape, with multiple tubes, and the fins are divided into single-row, double-row or multi-row structures. This heat exchanger is widely used in petrochemical, aviation, vehicle, power machinery, food, cryogenic, atomic energy, aerospace and other industrial fields. For example, superheaters, economizers, air preheaters, condensers, deaerators, feed water heaters, cooling towers, etc. in boiler thermal systems; hot blast stoves, air or gas preheaters in metal smelting systems, waste heat Boilers, etc.; evaporators, condensers, heat accumulators in refrigeration and low temperature systems; heating and cooling equipment are widely used in petrochemical industry, sugar liquid evaporators and pulp evaporators In sugar industry and paper industry, these are all replacements. Numerous examples of heater applications.
About Laser Welded Finned Tubes
2022 / 07 / 18
Application and material of finned tube Finned tubes are widely used in electric power, chemical and other industries. Many helical heat transfer surfaces or threaded tubes can be considered finned tubes. It has a significant effect on expanding the heat exchange area and promoting turbulent flow, and has a great effect on single-phase heat transfer and phase change convective heat transfer. The structure of the finned tube heat exchanger is basically the same as that of the general shell and tube heat exchanger. Just use finned tubes instead of bare tubes as heat transfer surfaces. Finned tube heat exchangers are also commonly used to heat or cool gas outside the tubes, steam or water passing through the tubes, such as air coolers, boiler economizers, radiators, etc. , Finned tube has a wide range of materials, including stainless steel, carbon steel, titanium copper alloy and so on. Industrial corrosion resistance is greatly improved.
The principle of finned tube heat exchanger - the characteristics of finned tube heat exchanger
2022 / 07 / 14
The heat exchanger is a very good energy-saving equipment, which can reuse the energy that would otherwise be wasted. The finned tube heat exchanger is a member of the heat exchanger family. Some working principles of fin-tube heat exchangers and its characteristics are convenient for everyone to have a better understanding of fin-tube heat exchangers. The principle of finned tube heat exchanger - the characteristics of finned tube heat exchanger 1. High heat transfer efficiency Because the disturbance of the fin to the fluid causes the boundary layer to break continuously, so it has a large heat transfer coefficient; at the same time, because the separator and fin are very thin and have high thermal conductivity, the finned tube heat exchange The device can achieve high efficiency. 2. Compact Because the finned tube heat exchanger has an expanded secondary surface, its specific surface area can reach 1000㎡/m3. 3. Lightweight The reason is that it is compact and mostly made of aluminum alloys, and now steel, copper, composite materials, etc. have also been mass-produced. 4. Strong adaptability The finned tube heat exchanger can be applied to: gas-gas, gas-liquid, liquid-liquid, heat exchange between various fluids, and phase change heat that occurs when the set state changes. Through the arrangement and combination of flow channels, it can adapt to different heat exchange conditions such as countercurrent, cross-flow, multi-stream,
What are the performance requirements for finned tubes?
2022 / 07 / 14
Finned tube radiator is generally used for heating or cooling air, and has the characteristics of compact structure and large unit heat exchange area. It can be widely used in textile, printing and dyeing, petroleum, chemical, drying, electric power and other industries. All play a vital role in heat dissipation. Finned tube is a kind of ribbed wall, which is widely used in power, chemical and other industries. Many spiral heat exchange surfaces or threaded tubes can also be regarded as finned tubes. It has a significant effect on expanding the heat exchange area and promoting turbulent flow, whether it has a great effect on single-phase heat transfer or phase-change convection heat transfer. The structure of the finned tube heat exchanger is basically the same as that of the general shell and tube heat exchanger. Only the finned tube is used instead of the bare tube as the heat transfer surface. Due to the enhanced heat transfer and compact structure, it can be made into a compact heat exchanger; the finned tube heat exchanger is also often used to heat or cool the gas outside the tube, while Pass steam or water in the tube, such as air cooler, boiler economizer, radiator, etc.
What finned tubes are used in industry
2022 / 07 / 14
What kind of performance does the radiator and heat exchanger have for the finned tube? The finned tube is required as a heat exchange element, and it works under the condition of high temperature flue gas for a long time. In a corrosive atmosphere, this requires that the finned tube should have high performance indicators. So what kind of performance requirements do radiators and heat exchangers have for finned tubes? 1. Corrosion resistance 2. Wear resistance 3. Low contact thermal resistance 4. High stability 5. Anti-fouling ability
Allowable temperature for finned tube radiators
2022 / 07 / 14
1; It is related to the fin material, for example, the fin material is aluminum, and the melting point is 660 °C. Therefore, the steel-aluminum composite finned tube is not suitable for the heat exchange system of high temperature flue gas. Considering that the high-temperature flue gas has sulfur components, the finned tube radiator is made of ND steel, and the fin type adopts high-frequency spiral finned tubes. 2; and processing technology. For example, the steel-aluminum composite finned tube begins to manifest at 210 °C, while the contact thermal resistance curve of the ordinary finned tube around the steel sheet shows an obvious upward trend from about 150 °C. 3; In general, it has little effect on the wall thickness of the base pipe. Under the normal wall thickness of ordinary seamless steel pipe, its pressure resistance capacity is relatively high. When the wall thickness of the steel pipe is constant, the pressure resistance capacity decreases with the increase of the diameter of the steel pipe. 4; It is related to the design strength of the tube sheet and the tube box. Tube sheet, the thicker the wall thickness of the tube box, the higher the pressure bearing capacity of the finned tube radiator. 5; It is related to the welding process. The pores, slag inclusions, incomplete penetration, cracks, etc. generated during welding all affect the pressure bearing capacity of the finned tube radiator, and the pressure and temperature are generally proportional to each other.
Factors to consider when purchasing inlaid finned tubes
2022 / 07 / 13
1. The finned tube with qualified quality has complete markings. The label will indicate the unit weight, heat dissipation, pressure, heating area, etc. in detail, and you should pay attention to it when purchasing. 2. Focus on checking the quality of its solder joints, and judge whether it is smooth or not by touching the surface with your hands. 3. Measure its weight. This is a simpler way to judge whether the thickness of the finned tube sheet meets the standard and whether the manufacturer is cutting corners. 4. According to the diversity of materials and styles, customers should choose according to their own needs and heating conditions. 5. Whether there is a purchase contract, and whether there is a pressure test (pressure test) and warranty related promises in the contract. 6. When purchasing finned tubes, try to purchase their heating renovation services to eliminate the loss caused by the unclear responsibility of both sides due to problems in the installation of their own workers.
What should be considered in the selection of KL type finned tubes
2022 / 07 / 13
safety This factor is very important. If this point cannot be satisfied, some people will not use it. It cannot be classified as a prohibited item to ensure its own safety, and it cannot be sold in the market. Therefore, it is generally only necessary to purchase from a reliable foundry. This problem not easy to cause. Durability When purchasing finned tubes, pay attention to their service life. The longer the life span, the lower the loss rate, and the replacement will be slower and more cost-effective. There is no doubt that the factory expects to spend less money. Therefore, durability has always been an option. Key elements of finned tubes. Green Environmental protection is similar to safety, but a lot of environmental protection is about the potential safety hazards to environmental quality. Therefore, when selecting finned tubes, low-carbon environmental protection should be selected, and the professional safety department will often come to inspect the factory's processing methods. Therefore, it is not necessary to select the organic waste gas discharged from the waste water and the sewage discharged from the waste water. Once the problem is found, it will encounter obvious problems of punishment and closure of the factory. Therefore, when selecting finned tubes, the first consideration is still cost-effectiveness and safety factors. These are all fundamental purchasing factors. Groups in different industries can consider them according to their own needs.
Why do spiral plate heat exchangers clog
2022 / 07 / 11
The common problem of the spiral plate heat exchanger on the market is the blockage problem, which is difficult to solve whether it is the manufacturer or the manufacturer who uses it. Some manufacturers have more impurities in the materials in the process of use, and the pipe wall space of the equipment is relatively small, which is easy to block when importing and exporting. Once the equipment is blocked, it will be shut down for maintenance and cleaning, which greatly affects the normal production process. s In the actual production process, we found that in addition to impurities or coking, the main problem of blockage is coagulation, which is a physical phenomenon. It is inconvenient for us to add other chemical cleaning agents during the production process. To solve the problem of clogging of the spiral plate heat exchanger in the process, it is necessary to improve the production process, and only find a way to work hard in the cleaning process. The previous spiral plate heat exchanger was difficult to clean, the structure was too compact, and the tools were not very convenient to use. A detachable device that has been developed now is easy to clean and all parameters are the same as those of the non-detachable device. At present, this detachable technology has not been promoted, and many manufacturers do not know that there is such a method. But as long as the customer who has the blockage problem can use this equipment to solve the problem, because it solves the problem for the customer
Advanced manufacturing technology of steel-aluminum composite finned tubes
2022 / 07 / 06
The steel-aluminum composite finned tube is composed of composite aluminum fins outside the steel tube. The thickness of the fins is 0.4 mm, and the heat dissipation efficiency is high and does not fall off. Pipe diameter can be made according to customer requirements, from diameter 16 to 32. The steel-aluminum composite finned tube has advanced manufacturing technology. It is formed by rolling steel and aluminum tubes on a special machine tool, so that the steel base tube and the aluminum fins are closely combined. , Small flow loss, strong anti-corrosion performance, long working life and so on. The heat transfer performance of the finned tube radiator decreases with the prolongation of the use time. When the finned tube radiator is installed and debugged, the design effect is not achieved, and the pipeline stroke connection is correct, and the insulation measures are ideal. The flow rate on the hot side in the tube is too low, and the main symptom is that the temperature difference between the inlet and outlet of the hot side is large. Check whether the dirt in the tube is serious, the thermal resistance of 1mm dirt ≈ the thermal resistance of 50mm steel plate. Check whether the fins are lodging or loose, especially the steel tube aluminum wound fin tube. Clean the ash or dust on the surface of the fins in time. Exhaust excess gas in the pipe to ensure that the trap works properly. If it is not for installation reasons, it cannot be ruled out that it is the design and manufacture of finned tube radiators.
The structure of the finned tube
2022 / 07 / 06
The new ways of enhancing heat transfer of air cooler finned tubes are expounded, and the structure, manufacturing process and heat transfer performance of various new finned tubes are introduced. At the same time, the heat transfer and friction resistance performance of the representative new finned tube is compared with the traditional straight finned tube, and the corresponding heat transfer coefficient curve, flow resistance coefficient curve and experimental formula are given. research shows. The heat transfer effect of the air cooler finned tube is significantly improved after the heat transfer enhancement is carried out. It is pointed out that comprehensive factors need to be considered in the manufacture and selection of new-type air cooler finned tubes. Although the performance of using air as a coolant is worse, as long as a suitable air cooler is selected and the inexhaustible air is used as a cooling medium, it is a significant energy-saving device compared with a water cooler, and it also avoids the sensitivity of water pollution and damage to the ecological balance.
Several principles to understand the principle of finned tubes
2022 / 07 / 06
After understanding several principles and functions of the principle of finned tubes, when to choose finned tubes, there are the following principles: (1) If the heat transfer coefficients on both sides of the tube are very different, fins should be installed on the side with the smaller heat transfer coefficient. Example 1: Boiler economizer, water runs in the tube, flue gas flows out of the tube, and fins should be used on the flue gas side. Example 2: For an air cooler, the liquid flows in the tube and the air flows out of the tube, and the fins should be added on the air side. Example 3: For a steam generator, water boils in the tube, and flue gas goes outside the tube, and fins should be added to the flue gas side. It should be noted that in the design, the side with the small heat transfer coefficient should be placed outside the tube to facilitate the installation of fins. (2) If the heat transfer coefficient on both sides of the tube is very small, in order to strengthen the heat transfer, fins should be installed on both sides at the same time. In this case, if fins are only added on one side, the increase in heat transfer will not have a significant effect. Example 1: In a traditional tubular air preheater, the air flows inside the tube and the flue gas flows outside the tube. Because it is gas-to-gas heat transfer, the heat transfer coefficients on both sides are very low, and it is very difficult to add fins to the tube, so the tube has to be used. Example 2: Heat pipe type air preheater, although the flue
Why do spiral plate heat exchangers clog
2022 / 07 / 06
The common problem of the spiral plate heat exchanger on the market is the blockage problem, which is difficult to solve whether it is the manufacturer or the manufacturer who uses it. Some manufacturers have more impurities in the materials in the process of use, and the pipe wall space of the equipment is relatively small, which is easy to block when importing and exporting. Once the equipment is blocked, it will be shut down for maintenance and cleaning, which greatly affects the normal production process. In the actual production process, we found that in addition to impurities or coking, the main problem of blockage is coagulation, which is a physical phenomenon, and it is not convenient for us to add other chemical cleaning agents during the production process. To solve the problem of clogging of the spiral plate heat exchanger in the process, it is necessary to improve the production process, and only find a way to work hard in the cleaning process. The previous spiral plate heat exchanger was difficult to clean, the structure was too compact, and the tools were not very convenient to use. A detachable device that has been developed now is easy to clean and all parameters are the same as those of the non-detachable device. At present, this detachable technology has not been promoted, and many manufacturers do not know that there is such a method. But as long as the customer who has the blockage problem can use this equipment to solve the problem, because it solves the problem for the customer
Heat transfer efficiency and smoothness of spiral finned tubes
2022 / 07 / 04
The spiral finned tube is very efficient in heat exchange, and to a certain extent, the heat dissipation area is very large, so it can be applied to a wide range of jobs. The finned tube has a longer service life, and the spiral finned tube uses the high-frequency power supply as the main heat source. The spiral finned tube has a very good heat transfer efficiency. If it is compared with other finned tube products, its heat transfer efficiency should be considered high. The efficiency is about four times higher. For the integral spiral finned tube, the entire fins are integrally rolled with the base tube, but other ordinary finned tubes are directly welded to the surface of the base tube. Therefore, on the welded joint surface, The phenomenon of thermal resistance is relatively easy and often occurs, resulting in a serious impact on the effect of heat transfer. Because the overall helical finned tube is better than the ordinary finned tube in the ability to resist fouling, because of its high-quality performance characteristics, the effect of use has been significantly improved and improved. In the process of production, it is mainly produced by rolling with multiple rollers. It has relatively high smoothness on the surface, and the overall density of the structure is also very high. The gap between the fin tube and the base tube is The height is relatively natural, so its anti-corrosion performance has been significantly improved. The advantage of the spiral finned tube is to increase the heat exchange area with a smaller specif
How to improve heat exchange efficienc
2022 / 06 / 24
In order to improve the heat exchange efficiency, fins are usually added on the surface of the heat exchange tube to increase the outer surface area (or inner surface area) of the heat exchange tube, so as to achieve the purpose of improving the heat exchange efficiency. Such a heat exchange tube is called a finned tube. . Finned tubes are divided into: square finned tubes, spiral finned tubes, longitudinal finned tubes, spiral serrated finned tubes, and inner finned tubes according to shape and structure; The finned tube is divided into: single metal finned tube and bimetallic composite finned tube according to the material; Finned tubes can be divided into: rolling finned tubes, welding finned tubes, roll forming finned tubes, and sleeve-forming finned tubes according to different processing techniques. Finned tubes offer many advantages, such as: 1. Strong heat transfer ability: Compared with the light pipe, the heat transfer area can be increased by 2-30 times, and the heat transfer coefficient can be increased by 1-2 times. 2. Compact structure: Due to the increased heat transfer area per unit volume, the heat transfer capacity is enhanced. Compared with the light tube under the same heat load, the Finned Tube Heat Exchanger has fewer tubes, and the diameter or height of the cylinder can be reduced, because the structure is compact and Easy to set up. 3. Materials can be used more effectively and rationally: not only because of the compact structure, the amount of materials is reduced, but also it is possible to flexibly select materials for heat transfer and process requirements, s
Application of laser welded finned tubes in boilers and wall-hung stove.
2022 / 06 / 24
Laser welded finned tubes are used in civil wall-hung stove, industrial boilers, etc. Using German technology and it is just started to be used in China, but have been used in Europe for decades of years. The advantage is that the contact thermal resistance is zero, which is finned compared to high frequency welding Larger, lighter, compact Heat Exchanger assembled, more energy-saving and environmentally friendly, which is complied with national emission requirements. Chinese name: laser welding finned tube, main materials are: stainless steel, titanium, copper, carbon steel.There are many types of finned tubes, mainly high frequency welding finned tubes. Although it is more advanced in terms of product quality and production automation than inlaying and brazing methods, but because of the high frequency welding of finned tubes Difficulties in welding the roots and wrinkles in the roots cause many shortcomings in the high-frequency welding finned tubes in terms of heat exchange efficiency and convenience in preventing dust accumulation. According to above advantage of it and in order to comply it with the national policy on energy conservation and emission reduction. Laser Welded Finned Tube is the most advanced product, which has irreplaceable advantages 1: the thickness of the base tube can be 0.8-1.5 mm, and the thickness of the fin can be 0.3-1 mm, which greatly saves material costs compared to other processes. 2: High penetration rate, can prevent gap corrosion, prolong service life, and reduce heat transfer heat resistance. 3: Break through the limitation of materials and use different materials for processing. 4: Easy se
How to improve the heat transfer efficiency of laser welded stainless steel finned tubes
2022 / 06 / 24
The design of Murphy Thermal Technology's laser welded stainless steel finned tube is mainly to improve the heat exchange efficiency. The finned tube usually adds fins on the surface of the heat exchange tube to increase the outer surface area (or inner surface area), that is, increasing the fin ratio. The finning ratio of the finned tube refers to the multiple of the surface area expansion of the surface of the light tube after adding fins. That is, the total external surface area of the finned tube divided by the external surface area of the original light tube. Under normal circumstances, after adding fins, the finning ratio of commonly used finned tubes is more than 10 times. The heat transfer area and heat transfer efficiency are greatly improved, and the bottleneck problem of the heat transfer effect is solved, which not only improves the product quality and efficiency, but also saves the cost. The calculation method of the finning ratio of Murphy laser welded stainless steel finned tube is calculated by the finned tube with the specification of Φ25*2-50/4/1. The base tube specification is 25*2, the outer diameter of the fin is 50, the pitch is 4mm, and the thickness is 1mm. 1. First calculate the area of the original light pipe, S1=1*3.14*0.025=0.0785㎡; 2. Calculate the total external surface area after adding fins. The total external surface area is divided into a, the area of the light pipe between the fins; b, the area of the top of the fin; c, the area of the front and back sides of the fin; in the Fin Tube of this specification, the light pipe seen by the a fin Area = (total length of fin tube - effective length of fin) * π * base tube outer diameter = 0.0589㎡; b fin top area = fin effective lengt
Introduction of laser welding technology for finned tubes
2022 / 06 / 20
Laser welded spiral finned tube is a new type of wear-resistant heat exchange material in the finned tube welding industry. It is also a high-efficiency and energy-saving heat exchange element, which has the characteristics of high heat exchange efficiency, large heat dissipation area, long service life, wide temperature range, high pressure resistance, and compliance with national energy conservation and environmental protection emission standards. Now it is widely used in petroleum refining, chemical industry, medicine, food, power plants, boilers, nuclear power, ships, military industry, drying refrigeration and other fields and other industries. Laser welding finned tubes adopts laser welding process, which can weld base tubes and fins with thinner wall thickness, as well as denser fin pitches. Thinner base tubes and dense fins can greatly improve the heat exchange efficiency, compared with High-frequency welded finned tubes of the same specification should save more than 30% of energy. Laser welding finned tube is a combination of spiral finned tube laser welding technology, hardware mold, and numerical control automatic control, which can realize welding between different metals (carbon steel, stainless steel, and other combination welding of any single metal). Flexible and convenient. It has overcome a series of problems such as breakage, slow speed, poor forming, and wrinkling of finned tubes during the welding process. Now our company has successfully mastered all the welding of finned tubes such as spiral finned tubes and heat exchangers. Production and coordination of parameters and automatic fixtures.
Working principle and application of finned tube
2022 / 06 / 20
The application of finned tubes is now very extensive. Its main purpose is heat exchange, so it is mainly installed on the surface of the heat exchange tube to improve the heat exchange efficiency. For the finned tube, its performance has certain requirements, mainly including wear resistance, stability, etc., especially when used in harsh environments, its performance is required to be good. In addition to low contact thermal resistance and has good dust resistance. What principles should be followed when using finned tubes for heat transfer? (1) If the heat transfer coefficients on both sides of the tube differ greatly, the finned tube should be installed on the smaller side. (2) If the heat transfer coefficients on both sides of the tube are very small, the finned tubes can be installed on both sides, not just on one side, which is ineffective. The working principle of finned tube To understand the heat transfer principle of finned tubes, we must first understand what the heat transfer coefficient is. The heat transfer coefficient refers to the heat transfer per unit temperature difference and unit heat transfer area, which can reflect the heat transfer ability between the fluid and the wall. Assuming that the actual heat transfer area of the finned tube is several times that of the outer surface of the original smooth tube, although the heat transfer coefficient of the flue gas is still very low, the heat transfer effect reflected on the outer surface of the smooth tube will greatly increase the tube an
The structure of the finned tube
2022 / 06 / 06
The new ways of enhancing heat transfer of air cooler finned tubes are expounded, and the structure, manufacturing process and heat transfer performance of various new finned tubes are introduced. At the same time, the heat transfer and friction resistance performance of the representative new finned tube is compared with the traditional straight finned tube, and the corresponding heat transfer coefficient curve, flow resistance coefficient curve and experimental formula are given. research shows. The heat transfer effect of the air cooler finned tube is significantly improved after the heat transfer enhancement is carried out. It is pointed out that comprehensive factors need to be considered in the manufacture and selection of new-type air cooler finned tubes. Although the performance of using air as a coolant is worse, as long as a suitable air cooler is selected and the inexhaustible air is used as a cooling medium, it is a significant energy-saving equipment compared with a water cooler, and it also avoids the sensitivity of pollution of water sources and damage to ecological balance.
How to improve heat exchange efficienc
2022 / 06 / 20
In order to improve the heat exchange efficiency, fins are usually added on the surface of the heat exchange tube to increase the outer surface area (or inner surface area) of the heat exchange tube, so as to achieve the purpose of improving the heat exchange efficiency. Such heat exchange tubes are called finned tubes. . Finned tubes are divided into: square finned tubes, spiral finned tubes, longitudinal finned tubes, helical sawtooth finned tubes, and inner finned tubes according to shape and structure; The finned tube is divided into: single metal finned tube and bimetallic composite finned tube according to the material; Finned tubes can be divided into: rolled finned tubes, welded finned tubes, rolled finned tubes, and sleeve-formed finned tubes according to different processing techniques. Finned tubes offer many advantages, such as: 1. Strong heat transfer ability: Compared with the light pipe, the heat transfer area can be increased by 2-30 times, and the heat transfer coefficient can be increased by 1-2 times. 2. Compact structure: Due to the increase of the heat transfer area per unit volume, the heat transfer capacity is improved. Compared with the bare tube under the same heat load, the finned tube heat exchanger has fewer tubes, and the diameter or height of the cylinder can be reduced because of its compact structure and easy installation. 3. The use of materials is more effective and reasonable: not only the structure is compact, the material consumption is reduced, but the materials can be flexibly selected acco
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