Selection of plate heat exchangers
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Our company needs to purchase a heat exchanger; a plate heat exchanger would be suitable, but we have no experience using them. Could any expert provide us with some information on this topic?
1. Introduction to Plate Heat Exchangers A plate heat exchanger is a new type of efficient heat exchanger constructed by stacking a series of metal sheets with a wavy shape. Thin rectangular channels are formed between various plates, through which heat exchange takes place via the half-plates. Compared with conventional shell-and-tube heat exchangers, it has a much higher heat transfer coefficient under the same flow resistance and pump power consumption, and shows a tendency to replace shell-and-tube heat exchangers within its applicable range. The main types of plate heat exchangers are frame-type (removable) and brazed types. The plate configurations include herringbone corrugated plates, horizontally flat corrugated plates, and nodular plates. 1.1 Basic structure of plate heat exchangers Plate heat exchangers are mainly composed of two major parts: a frame and plates. The plates are thin sheets made of various materials, which are pressed into waves of different shapes using various types of grinding tools; corner holes are provided at the four corners of the plates to serve as channels for the medium to flow through. The perimeter of the plate and the corner holes are sealed with rubber gaskets. The frame consists of a fixed pressing plate, a movable pressing plate, upper and lower guide rods, and clamping bolts, etc. A plate heat exchanger consists of plates that are stacked between a fixed compression plate and a movable compression plate, and then secured together with clamping bolts. 1.2 Characteristics of plate heat exchangers (comparison with shell-and-tube heat exchangers) a. High heat transfer coefficient: Due to the overlapping arrangement of the different corrugated plates, complex flow channels are formed, causing the fluid to flow in a three-dimensional rotational manner within these channels. Turbulence can occur at relatively low Reynolds numbers (typically Re=50~200), resulting in a high heat transfer coefficient; it is generally considered to be 3~5 times higher than that of shell-and-tube heat exchangers. b. Large logarithmic mean temperature difference, small terminal temperature difference: In shell-and-tube heat exchangers, the two fluids flow separately in the tube side and the shell side, resulting in a cross-flow pattern; hence, the logarithmic mean temperature difference correction factor is low. In plate heat exchangers, the fluids generally flow in parallel or counterflow, and the correction factor is usually around 0.95. Additionally, in plate heat exchangers, the cold and hot fluids flow parallel to the heat exchange surface without any bypass flow, which results in a small terminal temperature difference – it can be less than 1°C for heat exchange with water, whereas in shell-and-tube heat exchangers it is typically around 5°C.
c. Small footprint: Plate heat exchangers have a compact structure, with a heat exchange area per unit volume that is 2 to 5 times that of shell-and-tube heat exchangers. Moreover, there is no need to reserve space for removing the tube bundles for maintenance, as in shell-and-tube heat exchangers. Therefore, to achieve the same heat transfer capacity, plate heat exchangers require only about 1/5 to 1/8 of the space needed by shell-and-tube heat exchangers. d. It is easy to change the heat exchange area or the combination of processes; by adding or removing a few plates, it is possible to increase or decrease the heat exchange area ； By changing the arrangement of the plates or replacing a few of them, it is possible to achieve the desired combination of processes and adapt to new heat exchange conditions, whereas it is almost impossible to increase the heat transfer area of shell-and-tube heat exchangers. e. Light weight: The thickness of the plates in plate heat exchangers is only 0.4–0.8 mm, while the thickness of the heat exchange tubes in shell-and-tube heat exchangers is 2.0–2.5 mm. The shell of a shell-and-tube heat exchanger is much heavier than the frame of a plate heat exchanger; generally, a plate heat exchanger weighs only about 1/5 as much as a shell-and-tube heat exchanger. f. Low cost: Using the same materials and with the same heat exchange area, the cost of plate heat exchangers is approximately 40%~60% lower than that of shell-and-tube heat exchangers. g. Easy to manufacture: The heat transfer plates of plate heat exchangers are produced by stamping, featuring a high degree of standardization and allowing for mass production, whereas shell-and-tube heat exchangers are generally manufactured manually. h. Easy to clean: In frame-type plate heat exchangers, the plate bundles can be separated by loosening the tightening bolts, and the plates can be removed for mechanical cleaning, which is very convenient for heat exchange systems that require frequent cleaning. i. Low heat loss: In plate heat exchangers, only the outer shell plates of the heat transfer plates are exposed to the atmosphere; therefore, heat loss is negligible, and no insulation measures are required. Shell-and-tube heat exchangers have high heat losses and require insulation. j. The capacity is smaller, at 10%~20% of that of a shell-and-tube heat exchanger. k. High pressure loss per unit length: Due to the small gaps between the heat transfer surfaces and the irregularities on these surfaces, the pressure loss is higher compared to that of traditional smooth tubes. l. It is resistant to scaling: Due to the strong turbulence inside, scaling does not occur easily; its scaling coefficient is only 1/3 to 1/10 that of shell-and-tube heat exchangers.
m. The operating pressure should not be too high, nor should the temperature of the fluid be too high, as this may lead to leaks. Plate heat exchangers use gaskets for sealing, and the operating pressure generally should not exceed 2.5 MPa; the fluid temperature should be below 250°C, otherwise leaks may occur. n. Prone to clogging: Due to the narrow channels between the plates, which are typically only 2–5 mm wide, the channels can easily become blocked when the heat exchange medium contains large particles or fibrous substances. 1.4 Applications of plate heat exchangers a. Refrigeration: Used as condensers and evaporators. b. HVAC: Intermediate heat exchangers used in conjunction with boilers, intermediate heat exchangers for high-rise buildings, etc. c. Chemical industry: soda ash industry, synthetic ammonia, alcohol fermentation, resin synthesis cooling, etc. d. Metallurgical industry: heating or cooling of aluminate mother liquors, cooling in steelmaking processes, etc. e. Machinery industry: cooling of various quenching fluids, cooling of reducer lubricants, etc. f. Power industry: cooling of high-voltage transformer oil, cooling of generator bearing oil, etc. g. Paper industry: heat recovery in bleaching processes, heating pulp wash liquors, etc. h. Textile industry: cooling of viscose filaments in alkaline solutions, cooling of boiled nitrocellulose, etc. i. Food industry: sterilization and cooling of fruit juices, heating and cooling of animal and vegetable oils, etc. j. Fat processing: soap-based atmospheric drying, heating or cooling of liquids used in various processes. k. Centralized heating: District heating using waste heat from thermal power plants to heat water for bathing. l. Others: petroleum, pharmaceuticals, ships, seawater desalination, geothermal utilization. 1.5 Issues to Consider When Selecting Plate Heat Exchangers 1.5.1 Selection of Plate Type The type of plate, whether it be flat or corrugated, should be determined based on the actual requirements of the heat exchange application. For situations with high flow rates and a low allowable pressure drop, a plate type with low resistance should be selected; conversely, a plate type with high resistance should be chosen. Based on the fluid pressure and temperature conditions, determine whether to choose a detachable or brazed type. When determining the plate layout, it is not advisable to choose plates with too small a surface area, as this may result in an excessive number of plates, lower flow velocities between them, and consequently a lower heat transfer coefficient. This issue is particularly important to consider in larger heat exchangers. 1.5.2 Selection of flow paths and channels A flow path refers to a set of parallel channels within a plate heat exchanger in which a fluid flows in the same direction, whereas a channel is the flow path for the fluid formed by two adjacent plates within a plate heat exchanger. Generally, several flow channels are connected in parallel or series to form various combinations of cold and hot medium channels. The process combination form should be determined based on heat transfer and fluid resistance calculations, while meeting the requirements of the process conditions. Try to make the convective heat transfer coefficients in the cold and hot water channels equal or similar, thereby achieving the best heat transfer performance. Because the heat transfer coefficient attains a higher value when the convective heat transfer coefficients on both sides of the heat transfer surface are equal or similar. Although the flow velocities between the plates of a plate heat exchanger vary, the average flow velocity is still used in heat transfer and fluid resistance calculations. Since the nozzles of the single \"U\"-shaped process are all fixed on the pressing plate, they are easy to install and remove. 1.5.3 Pressure drop verification In the design and selection of plate heat exchangers, certain requirements are generally imposed on the pressure drop; therefore, it is necessary to conduct a verification. If the verified pressure drop exceeds the allowable value, redesign and selection calculations must be carried out again until the process requirements are met. Return Plate Heat Exchangers Overview The BR-type plate heat exchangers produced by this factory feature high heat exchange efficiency, low pressure losses due to fluid flow, a compact design, precise temperature control, great operational flexibility, easy installation and disassembly, and a long service life. They represent the most advanced efficient and energy-saving heat exchange equipment available in China at present. The plate heat exchangers produced by our factory can handle a very wide range of materials. From ordinary industrial water to highly viscous liquids, from food and pharmaceutical fluids with high hygiene requirements to acidic and alkaline liquids with certain corrosive properties, as well as liquid materials containing particles or powders and suspended liquids with a small amount of fibers, all can be processed using plate heat exchangers. It can be used in applications such as heating, cooling, evaporation, condensation, sterilization, and heat recovery. Such as internal circulation in the cooled generator set and rectifier ； Used as mechanical lubricant in metallurgical mines and similar applications ； Sterilization and disinfection of hydraulic stations, egg liquid, and edible oil; sterilization of beer and wine ； Used for waste heat recovery in the light textile industry and papermaking sector ； Collect condensate water for centralized heating ； Convert from steam to water heating ； Intermediate heat exchange in the boiler deaeration system, etc. It is currently widely used in industrial sectors such as metallurgy, mining, petroleum, chemicals, power generation, pharmaceuticals, food processing, chemical fibers, light textiles, paper manufacturing, shipbuilding, and centralized heating. Structural Principle The detachable plate heat exchanger is composed of numerous corrugated thin plates that are arranged at regular intervals; the edges of these plates are sealed using gaskets, and they are pressed together by a frame and compression screws. The corner holes in the plates and gaskets serve as distribution and collection channels for the fluid, while also allowing the cold and hot fluids to be separated properly, so that they flow in the channels on either side of each plate, thereby enabling heat exchange through those plates. Design features of plate heat exchangers: 1. High efficiency and energy savings: Their heat transfer coefficient ranges from 3,000 to 4,500 kcal/m2·°C·h, which is 3 to 5 times higher than that of shell-and-tube heat exchangers. 2. Compact structure: The plates of a plate heat exchanger are arranged closely together; compared to other types of heat exchangers, it occupies less floor space and volume. For the same heat transfer capacity, a plate heat exchanger requires only 1/5 of the space needed by a shell-and-tube heat exchanger. 3. Easy to clean and assemble: Plate heat exchangers use clamping bolts to hold the plate sheets in place, which makes them easy to disassemble and clean at any time. Additionally, due to the smooth surface of the plates, turbulence is high, making scaling less likely to occur. 4. Long service life: Plate heat exchangers are made from stainless steel or titanium alloy plates, allowing them to resist various corrosive substances. The gaskets can be replaced easily, and the units can be assembled, disassembled, and maintained conveniently. 5. Strong adaptability: The plates of plate heat exchangers are independent components, allowing the flow path to be adjusted as needed, with various configurations available ； It can be applied to various different process requirements. 6. No cross-contamination of fluids: The seal grooves of plate heat exchangers are equipped with drainage channels, preventing different fluids from mixing together; even in the event of a leak, the fluid will always be discharged outward. Applications of plate heat exchangers Plate heat exchangers are widely used in industries such as metallurgy, mining, petroleum, chemicals, power generation, pharmaceuticals, food processing, chemical fibers, papermaking, light textiles, shipbuilding, and heating. They can be utilized for heating, cooling, evaporation, condensation, sterilization, waste heat recovery, and various other applications. Chemical industry Production of titanium oxide, alcohol fermentation, ammonia synthesis, resin production, rubber manufacturing, cooling of phosphoric acid, cooling of formalin solutions, alkali-carbon industry, and electrolytic soda production. Steel industry: Cooling quenching oils, cooling fluids for electroplating, lubricants for cooling reducers, and cooling fluids for rolling mills and wire drawing machines. Metallurgical industry: heating and cooling of aluminate mother liquors, cooling of sodium aluminate, cooling of lubricants in aluminum smelting rolling mills. Mechanical manufacturing: cooling for various quenching fluids, lubricants for presses and industrial machine tools, and oils for heating engines. Food industry: sterilization and cooling in salt production, dairy products, soy sauce, and vinegar; heating and cooling of animal and vegetable oils; heating and cooling of beer and wort in beer production; sugar production; gelatin concentration; sterilization and cooling; production of monosodium glutamate. Textile industry: heat recovery from various waste liquids, cooling of phosphoric acid-treated fibers, cooling of viscose solutions, cooling of acetic acid and acetic anhydride, cooling of alkaline aqueous solutions, heating and cooling of viscose filaments. Paper industry: cooling black liquor, heating and cooling salts and alkali solutions used in bleaching, heat recovery from cellophane waste liquid, heating acid used in pulping, cooling sodium hydroxide solutions, recycling waste liquid from bleached paper, condensation of exhaust gases, preheating waste liquid containing concentrated pulp. Central heating: Use of waste heat from thermal power plants for heating, as well as for heating domestic water; boiler-based heating.
Oil industry: Used for heating and cooling synthetic detergents, heating whale oil, cooling vegetable oils, cooling sodium hydroxide, and cooling glycerin and emulsified oils. Power industry: cooling of generator shaft pumps, cooling of transformer oil. Ship diesel engines, central coolers, water-cooled jacket coolers, piston coolers, lubricating oil coolers, preheaters, seawater desalination systems (including multi-stage and single-stage types). Others: pharmaceuticals, petroleum, ceramics, glass, cement, geothermal energy utilization, etc.
c. Small footprint: Plate heat exchangers have a compact structure, with a heat exchange area per unit volume that is 2 to 5 times that of shell-and-tube heat exchangers. Moreover, there is no need to reserve space for removing the tube bundles for maintenance, as in shell-and-tube heat exchangers. Therefore, to achieve the same heat transfer capacity, plate heat exchangers require only about 1/5 to 1/8 of the space needed by shell-and-tube heat exchangers. d. It is easy to change the heat exchange area or the combination of processes; by adding or removing a few plates, it is possible to increase or decrease the heat exchange area ； By changing the arrangement of the plates or replacing a few of them, it is possible to achieve the desired combination of processes and adapt to new heat exchange conditions, whereas it is almost impossible to increase the heat transfer area of shell-and-tube heat exchangers. e. Light weight: The thickness of the plates in plate heat exchangers is only 0.4–0.8 mm, while the thickness of the heat exchange tubes in shell-and-tube heat exchangers is 2.0–2.5 mm. The shell of a shell-and-tube heat exchanger is much heavier than the frame of a plate heat exchanger; generally, a plate heat exchanger weighs only about 1/5 as much as a shell-and-tube heat exchanger. f. Low cost: Using the same materials and with the same heat exchange area, the cost of plate heat exchangers is approximately 40%~60% lower than that of shell-and-tube heat exchangers. g. Easy to manufacture: The heat transfer plates of plate heat exchangers are produced by stamping, featuring a high degree of standardization and allowing for mass production, whereas shell-and-tube heat exchangers are generally manufactured manually. h. Easy to clean: In frame-type plate heat exchangers, the plate bundles can be separated by loosening the tightening bolts, and the plates can be removed for mechanical cleaning, which is very convenient for heat exchange systems that require frequent cleaning. i. Low heat loss: In plate heat exchangers, only the outer shell plates of the heat transfer plates are exposed to the atmosphere; therefore, heat loss is negligible, and no insulation measures are required. Shell-and-tube heat exchangers have high heat losses and require insulation. j. The capacity is smaller, at 10%~20% of that of a shell-and-tube heat exchanger. k. High pressure loss per unit length: Due to the small gaps between the heat transfer surfaces and the irregularities on these surfaces, the pressure loss is higher compared to that of traditional smooth tubes. l. It is resistant to scaling: Due to the strong turbulence inside, scaling does not occur easily; its scaling coefficient is only 1/3 to 1/10 that of shell-and-tube heat exchangers.
m. The operating pressure should not be too high, nor should the temperature of the fluid be too high, as this may lead to leaks. Plate heat exchangers use gaskets for sealing, and the operating pressure generally should not exceed 2.5 MPa; the fluid temperature should be below 250°C, otherwise leaks may occur. n. Prone to clogging: Due to the narrow channels between the plates, which are typically only 2–5 mm wide, the channels can easily become blocked when the heat exchange medium contains large particles or fibrous substances. 1.4 Applications of plate heat exchangers a. Refrigeration: Used as condensers and evaporators. b. HVAC: Intermediate heat exchangers used in conjunction with boilers, intermediate heat exchangers for high-rise buildings, etc. c. Chemical industry: soda ash industry, synthetic ammonia, alcohol fermentation, resin synthesis cooling, etc. d. Metallurgical industry: heating or cooling of aluminate mother liquors, cooling in steelmaking processes, etc. e. Machinery industry: cooling of various quenching fluids, cooling of reducer lubricants, etc. f. Power industry: cooling of high-voltage transformer oil, cooling of generator bearing oil, etc. g. Paper industry: heat recovery in bleaching processes, heating pulp wash liquors, etc. h. Textile industry: cooling of viscose filaments in alkaline solutions, cooling of boiled nitrocellulose, etc. i. Food industry: sterilization and cooling of fruit juices, heating and cooling of animal and vegetable oils, etc. j. Fat processing: soap-based atmospheric drying, heating or cooling of liquids used in various processes. k. Centralized heating: District heating using waste heat from thermal power plants to heat water for bathing. l. Others: petroleum, pharmaceuticals, ships, seawater desalination, geothermal utilization. 1.5 Issues to Consider When Selecting Plate Heat Exchangers 1.5.1 Selection of Plate Type The type of plate, whether it be flat or corrugated, should be determined based on the actual requirements of the heat exchange application. For situations with high flow rates and a low allowable pressure drop, a plate type with low resistance should be selected; conversely, a plate type with high resistance should be chosen. Based on the fluid pressure and temperature conditions, determine whether to choose a detachable or brazed type. When determining the plate layout, it is not advisable to choose plates with too small a surface area, as this may result in an excessive number of plates, lower flow velocities between them, and consequently a lower heat transfer coefficient. This issue is particularly important to consider in larger heat exchangers. 1.5.2 Selection of flow paths and channels A flow path refers to a set of parallel channels within a plate heat exchanger in which a fluid flows in the same direction, whereas a channel is the flow path for the fluid formed by two adjacent plates within a plate heat exchanger. Generally, several flow channels are connected in parallel or series to form various combinations of cold and hot medium channels. The process combination form should be determined based on heat transfer and fluid resistance calculations, while meeting the requirements of the process conditions. Try to make the convective heat transfer coefficients in the cold and hot water channels equal or similar, thereby achieving the best heat transfer performance. Because the heat transfer coefficient attains a higher value when the convective heat transfer coefficients on both sides of the heat transfer surface are equal or similar. Although the flow velocities between the plates of a plate heat exchanger vary, the average flow velocity is still used in heat transfer and fluid resistance calculations. Since the nozzles of the single \"U\"-shaped process are all fixed on the pressing plate, they are easy to install and remove. 1.5.3 Pressure drop verification In the design and selection of plate heat exchangers, certain requirements are generally imposed on the pressure drop; therefore, it is necessary to conduct a verification. If the verified pressure drop exceeds the allowable value, redesign and selection calculations must be carried out again until the process requirements are met. Return Plate Heat Exchangers Overview The BR-type plate heat exchangers produced by this factory feature high heat exchange efficiency, low pressure losses due to fluid flow, a compact design, precise temperature control, great operational flexibility, easy installation and disassembly, and a long service life. They represent the most advanced efficient and energy-saving heat exchange equipment available in China at present. The plate heat exchangers produced by our factory can handle a very wide range of materials. From ordinary industrial water to highly viscous liquids, from food and pharmaceutical fluids with high hygiene requirements to acidic and alkaline liquids with certain corrosive properties, as well as liquid materials containing particles or powders and suspended liquids with a small amount of fibers, all can be processed using plate heat exchangers. It can be used in applications such as heating, cooling, evaporation, condensation, sterilization, and heat recovery. Such as internal circulation in the cooled generator set and rectifier ； Used as mechanical lubricant in metallurgical mines and similar applications ； Sterilization and disinfection of hydraulic stations, egg liquid, and edible oil; sterilization of beer and wine ； Used for waste heat recovery in the light textile industry and papermaking sector ； Collect condensate water for centralized heating ； Convert from steam to water heating ； Intermediate heat exchange in the boiler deaeration system, etc. It is currently widely used in industrial sectors such as metallurgy, mining, petroleum, chemicals, power generation, pharmaceuticals, food processing, chemical fibers, light textiles, paper manufacturing, shipbuilding, and centralized heating. Structural Principle The detachable plate heat exchanger is composed of numerous corrugated thin plates that are arranged at regular intervals; the edges of these plates are sealed using gaskets, and they are pressed together by a frame and compression screws. The corner holes in the plates and gaskets serve as distribution and collection channels for the fluid, while also allowing the cold and hot fluids to be separated properly, so that they flow in the channels on either side of each plate, thereby enabling heat exchange through those plates. Design features of plate heat exchangers: 1. High efficiency and energy savings: Their heat transfer coefficient ranges from 3,000 to 4,500 kcal/m2·°C·h, which is 3 to 5 times higher than that of shell-and-tube heat exchangers. 2. Compact structure: The plates of a plate heat exchanger are arranged closely together; compared to other types of heat exchangers, it occupies less floor space and volume. For the same heat transfer capacity, a plate heat exchanger requires only 1/5 of the space needed by a shell-and-tube heat exchanger. 3. Easy to clean and assemble: Plate heat exchangers use clamping bolts to hold the plate sheets in place, which makes them easy to disassemble and clean at any time. Additionally, due to the smooth surface of the plates, turbulence is high, making scaling less likely to occur. 4. Long service life: Plate heat exchangers are made from stainless steel or titanium alloy plates, allowing them to resist various corrosive substances. The gaskets can be replaced easily, and the units can be assembled, disassembled, and maintained conveniently. 5. Strong adaptability: The plates of plate heat exchangers are independent components, allowing the flow path to be adjusted as needed, with various configurations available ； It can be applied to various different process requirements. 6. No cross-contamination of fluids: The seal grooves of plate heat exchangers are equipped with drainage channels, preventing different fluids from mixing together; even in the event of a leak, the fluid will always be discharged outward. Applications of plate heat exchangers Plate heat exchangers are widely used in industries such as metallurgy, mining, petroleum, chemicals, power generation, pharmaceuticals, food processing, chemical fibers, papermaking, light textiles, shipbuilding, and heating. They can be utilized for heating, cooling, evaporation, condensation, sterilization, waste heat recovery, and various other applications. Chemical industry Production of titanium oxide, alcohol fermentation, ammonia synthesis, resin production, rubber manufacturing, cooling of phosphoric acid, cooling of formalin solutions, alkali-carbon industry, and electrolytic soda production. Steel industry: Cooling quenching oils, cooling fluids for electroplating, lubricants for cooling reducers, and cooling fluids for rolling mills and wire drawing machines. Metallurgical industry: heating and cooling of aluminate mother liquors, cooling of sodium aluminate, cooling of lubricants in aluminum smelting rolling mills. Mechanical manufacturing: cooling for various quenching fluids, lubricants for presses and industrial machine tools, and oils for heating engines. Food industry: sterilization and cooling in salt production, dairy products, soy sauce, and vinegar; heating and cooling of animal and vegetable oils; heating and cooling of beer and wort in beer production; sugar production; gelatin concentration; sterilization and cooling; production of monosodium glutamate. Textile industry: heat recovery from various waste liquids, cooling of phosphoric acid-treated fibers, cooling of viscose solutions, cooling of acetic acid and acetic anhydride, cooling of alkaline aqueous solutions, heating and cooling of viscose filaments. Paper industry: cooling black liquor, heating and cooling salts and alkali solutions used in bleaching, heat recovery from cellophane waste liquid, heating acid used in pulping, cooling sodium hydroxide solutions, recycling waste liquid from bleached paper, condensation of exhaust gases, preheating waste liquid containing concentrated pulp. Central heating: Use of waste heat from thermal power plants for heating, as well as for heating domestic water; boiler-based heating.
Oil industry: Used for heating and cooling synthetic detergents, heating whale oil, cooling vegetable oils, cooling sodium hydroxide, and cooling glycerin and emulsified oils. Power industry: cooling of generator shaft pumps, cooling of transformer oil. Ship diesel engines, central coolers, water-cooled jacket coolers, piston coolers, lubricating oil coolers, preheaters, seawater desalination systems (including multi-stage and single-stage types). Others: pharmaceuticals, petroleum, ceramics, glass, cement, geothermal energy utilization, etc.
What are the operating conditions, and what are the process parameters?
There are many posts on the plate heat exchanger forum that provide information on this topic; you can search for them yourself. Here is a software for selecting and calculating plate heat exchangers: http://bbs.hcbbs.com/thread-205302-1-1.html. Take a look. This post was last edited by Pseudo Xiao Bao on 2009-3-30 at 12:40
Plate heat exchangers have high heat exchange efficiency and require little space. But maintenance is rather troublesome, and the biggest drawback is that internal leaks are not detectable.
The poster should specify the operating conditions; since different manufacturers produce different models of heat exchangers, it’s best to let the manufacturer choose the appropriate model. In case there are any problems with the product, you can directly contact the manufacturer for assistance.
What are the operating conditions for the original poster? Plate heat exchangers have clear advantages for heat exchange between liquids. Their main strengths are high heat transfer efficiency and low space requirement, while their drawback is their inability to withstand high temperatures and pressures. It’s mainly the gaskets that tend to get damaged easily
I work in construction; I’ve only been employed for two years. This is the first time I’ve seen a plate heat exchanger on-site – it’s from Alfa Laval. I’m currently learning about the related pressure testing and installation procedures. Thank you to those who provided information above
Search online – there are many resources available. Share your operational parameters and let others give you some advice
Plate heat exchangers have a high heat transfer efficiency, but their operating pressure is relatively low, which means they are more prone to leakage and cross-contamination of fluids. If your materials are of average quality and the operating pressure is not high, you can consider using it. However, if the material is dangerous or highly corrosive, especially when the operating pressure is high, I still recommend using a tubular heat exchanger.
For reference for manufacturers of plate heat exchangers, Shanghai Erxing Heat Exchangers does a good job.