Design Considerations for Plate Type Heat Exchanger
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A plate type heat exchanger consists of corrugated metal plates clamped together in a frame. Fluids flow between the plates, which have a high surface area and induce turbulence, allowing for efficient heat transfer. Key advantages are compact size, ability to handle low flow rates, and the option to perform multiple duties with one unit. Design involves selecting the number and dimensions of plates based on flow rates, properties of the fluids, and heat transfer correlations or manufacturer charts.
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HEAT EXCHANGERS. Heat exchangers are devices that facilitate the exchange of heat between two fluids that are at different temperature while keeping them from mixing with each other.
2. Double Pipe Heat Exchangers
3. A typical double pipe heat exchanger basically consists of a tube or pipe fixed concentrically inside a larger pipe or tube They are used when flow rates of the fluids and the heat duty are small (less than 5 kW) These are simple to construct, but may require a lot of physical space to achieve the desired heat transfer area.
4. Double-pipe exchangers is the generic term covering a range of jacketed 'U' tube exchangers normally operating in countercurrent flow of two types which is true double pipes and multitubular hairpins. One fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Two types of flow arrangement: Parallel flow Counter flow
5. • The fluids may be separated by a plane wall but more commonly by a concentric tube (double pipe) arrangement shown in fig. If both the fluids move in the same direction, the arrangement is called a parallel flow type. In the counter flow arrangement the fluids move in parallel but opposite directions. In a double pipe heat exchanger, either the hot or cold fluid occupies the annular space and the other fluid moves through the inner pipe. The method of solving the problem using logarithmic mean temperature difference is typical and more iteration must be done. So it takes more time for the problem to solve. Therefore another method is practiced for solving this type of problems. This method is known as Effectiveness and Number of Transfer Units or simply ε-NTU method.“Effectiveness of heat exchangers is defined as actual heat transfer rate by maximum possible heat transfer rate”.The LMTD method may be applied to design problems for which the fluid flow rates and inlet temperatures, as well as a desired outlet temperature, are prescribed.
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This document discusses heat exchangers, which allow the transfer of heat between two fluids without direct contact. It describes several types of heat exchangers including double pipe heat exchangers, which involve two concentric pipes, and shell and tube heat exchangers, which involve tubes inside a cylindrical shell. Shell and tube heat exchangers are widely used and involve tubes, tube sheets, baffles, and multiple passes to increase heat transfer. The document also discusses applications and advantages and disadvantages of different heat exchanger designs.
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This document provides an overview of the methodology for heat exchanger design. It discusses that heat exchanger design is a complex, multidisciplinary process that involves specifying requirements, evaluating design concepts, detailed sizing and optimization. Key considerations in the design process include thermal and hydraulic design of the exchanger, mechanical design to ensure structural integrity, and manufacturing factors that influence cost. The methodology involves iterative thermal modeling, mechanical analysis, and consideration of manufacturing to arrive at an optimized design.
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Heat exchangers transfer heat from one fluid to another without direct contact between the fluids. The most common type is the shell-and-tube heat exchanger, which consists of tubes in a shell container. Fluids flow inside the tubes and outside in the shell. Other key types include double-pipe exchangers, plate-and-frame exchangers, air-cooled exchangers, and spiral exchangers. Spiral exchangers have two fluids spiraling in opposite directions to enhance heat transfer.
Selection of Heat Exchanger Types
Selection of Heat Exchanger Types
0 INTRODUCTION/PURPOSE
1 SCOPE
2 FIELD OF APPLICATION
3 DEFINITIONS
4 BACKGROUND
5 FACTORS INFLUENCING SELECTION
5.1 Type of Duty
5.2 Temperatures and Pressures
5.3 Materials of Construction 5.4 Fouling
5.5 Safety and Reliability
5.6 Repairs
5.7 Design Methods
5.8 Dimensions and Weight
5.9 Cost
5.10 GBHE Experience
6 TYPES OF EXCHANGER
6.1 Shell and Tube Exchangers
6.2 Cylindrical Graphite Block Heat Exchangers
6.3 Cubic Graphite Block Heat Exchangers
6.4 Air Cooled Heat Exchangers
6.5 Gasketed Plate and Frame
6.6 Spiral Plate
6.7 Tube in Duct
6.8 Plate-fin
6.9 Printed Circuit Heat Exchanger (PCHE)
6.10 Scraped Surface/Wiped Film Exchangers
6.11 Welded or Brazed Plate
6.12 Double Pipe
6.13 Electric Heaters
6.14 Fired Process Heaters
TABLE
(1) ADVANTAGES AND DISADVANTAGES OF DIFFERENT SHELL AND TUBE DESIGNS
FIGURES
1 ESTIMATED MAIN PLANT ITEM COSTS
2 ESTIMATED INSTALLED COSTS
3 TEMA HEAT EXCHANGER NOMENCLATURE
4 F ‘CORRECTION FACTORS' : TEMA E SHELL WITH EVEN NUMBER OF PASSE
5 SHELL AND TUBE HEAT EXCHANGER HEAD TYPES
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Recognize numerous types of heat exchangers, and classify them.
Develop an awareness of fouling on surfaces, and determine the overall heat transfer coefficient for a heat exchanger.
Perform a general energy analysis on heat exchangers.
Obtain a relation for the logarithmic mean temperature difference for use in the LMTD method, and modify it for different types of heat exchangers using the correction factor.
Develop relations for effectiveness, and analyze heat exchangers when outlet temperatures are not known using the effectiveness-NTU method.
Know the primary considerations in the selection of heat exchangers.
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This design project aims to propose a plate type heat exchanger that can meet given heat duty and find the number of plates required. Plate type heat exchanger uses metal plates to transfer heat between two fluids. Starting point of this design is to define given properties
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The document discusses unit operations in food process engineering. It describes the objectives as studying principles and laws governing physical, chemical, or biochemical process stages and related equipment. It classifies unit operations into physical, chemical, and biochemical stages involving operations like grinding, sieving, filtration, and fermentation. It also discusses mass transfer, heat transfer, and simultaneous mass-heat transfer unit operations. The document then focuses on heat exchangers, describing types like plate, tubular, and shell-and-tube heat exchangers. It discusses parameters for heat exchanger design like overall heat transfer coefficient, log mean temperature difference, and fouling factor.
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A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids flowing in opposite directions. It consists of many corrugated metal plates clamped together in a frame to create channels for fluid flow. Plate heat exchangers offer benefits like high heat transfer efficiency in a compact design, but are limited to lower pressures and flow rates than some other heat exchanger types. They are widely used in industrial processes for applications like heating and cooling.
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Recuperators are heat exchangers that transfer heat from one fluid stream to another without mixing the fluids. They are commonly used to recover waste heat from exhaust gases to preheat intake air in applications like gas turbines, furnaces, and ventilation systems. This increases efficiency by reducing the amount of fuel or additional heat needed. Recuperators transfer heat through a solid barrier separating the fluid streams and come in designs like plate, tube, or rotary. They provide efficiency gains over alternatives but require maintenance to address deposits on heat transfer surfaces over time.
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Heat exchangers transfer heat between two or more fluids that are at different temperatures. They work by bringing the fluids into thermal contact through a conducting surface while preventing mixing. There are several types of heat exchangers classified by their heat exchange process, fluid flow direction, mechanical design, and physical state. A common type is the shell and tube heat exchanger, which consists of a shell with a bundle of tubes inside. One fluid flows through the tubes while another flows over the tubes to transfer heat between the fluids. Double pipe heat exchangers are a simpler design with one pipe inside a larger pipe, allowing fluids to flow within and between the pipes.
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HEAT EXCHANGERS. Heat exchangers are devices that facilitate the exchange of heat between two fluids that are at different temperature while keeping them from mixing with each other.
2. Double Pipe Heat Exchangers
3. A typical double pipe heat exchanger basically consists of a tube or pipe fixed concentrically inside a larger pipe or tube They are used when flow rates of the fluids and the heat duty are small (less than 5 kW) These are simple to construct, but may require a lot of physical space to achieve the desired heat transfer area.
4. Double-pipe exchangers is the generic term covering a range of jacketed 'U' tube exchangers normally operating in countercurrent flow of two types which is true double pipes and multitubular hairpins. One fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Two types of flow arrangement: Parallel flow Counter flow
5. • The fluids may be separated by a plane wall but more commonly by a concentric tube (double pipe) arrangement shown in fig. If both the fluids move in the same direction, the arrangement is called a parallel flow type. In the counter flow arrangement the fluids move in parallel but opposite directions. In a double pipe heat exchanger, either the hot or cold fluid occupies the annular space and the other fluid moves through the inner pipe. The method of solving the problem using logarithmic mean temperature difference is typical and more iteration must be done. So it takes more time for the problem to solve. Therefore another method is practiced for solving this type of problems. This method is known as Effectiveness and Number of Transfer Units or simply ε-NTU method.“Effectiveness of heat exchangers is defined as actual heat transfer rate by maximum possible heat transfer rate”.The LMTD method may be applied to design problems for which the fluid flow rates and inlet temperatures, as well as a desired outlet temperature, are prescribed.
6. Application of Double Pipe Heat Exchanger Pasteurization or sterilization of food and bioproducts Condensers and evaporators of air conditioners Radiators for internal combustion engines Charge air coolers and intercoolers for cooling supercharged engine intake air of diesel engines.
heat exchanger
This document discusses heat exchangers, which allow the transfer of heat between two fluids without direct contact. It describes several types of heat exchangers including double pipe heat exchangers, which involve two concentric pipes, and shell and tube heat exchangers, which involve tubes inside a cylindrical shell. Shell and tube heat exchangers are widely used and involve tubes, tube sheets, baffles, and multiple passes to increase heat transfer. The document also discusses applications and advantages and disadvantages of different heat exchanger designs.
Design plate heat exchangers
This document discusses the advantages of considering compact heat exchangers like plate-and-frame exchangers early in the process design stage. Plate-and-frame exchangers can be significantly smaller than traditional shell-and-tube exchangers while meeting the same heat transfer needs. Specifying design requirements without considering the characteristics of different exchanger types can lead to oversized and more expensive designs. Charts are provided to help estimate the required area of plate-and-frame exchangers for preliminary sizing.
Heat exchanger design
Heat exchangers transfer thermal energy between two or more fluids at different temperatures. They are classified based on their transfer process, geometry, heat transfer mechanism, and flow arrangement. Shell-and-tube heat exchangers consist of a set of tubes in a shell container and are the most important type, used across many industries. Their design involves calculating the heat transfer rate, selecting appropriate materials and geometry, and ensuring optimal fluid velocities and pressure drops within design limits.
Heat exchanger design.
This document provides an overview of the methodology for heat exchanger design. It discusses that heat exchanger design is a complex, multidisciplinary process that involves specifying requirements, evaluating design concepts, detailed sizing and optimization. Key considerations in the design process include thermal and hydraulic design of the exchanger, mechanical design to ensure structural integrity, and manufacturing factors that influence cost. The methodology involves iterative thermal modeling, mechanical analysis, and consideration of manufacturing to arrive at an optimized design.
types of heat exchanger
Heat exchangers transfer heat from one fluid to another without direct contact between the fluids. The most common type is the shell-and-tube heat exchanger, which consists of tubes in a shell container. Fluids flow inside the tubes and outside in the shell. Other key types include double-pipe exchangers, plate-and-frame exchangers, air-cooled exchangers, and spiral exchangers. Spiral exchangers have two fluids spiraling in opposite directions to enhance heat transfer.
Selection of Heat Exchanger Types
Selection of Heat Exchanger Types
0 INTRODUCTION/PURPOSE
1 SCOPE
2 FIELD OF APPLICATION
3 DEFINITIONS
4 BACKGROUND
5 FACTORS INFLUENCING SELECTION
5.1 Type of Duty
5.2 Temperatures and Pressures
5.3 Materials of Construction 5.4 Fouling
5.5 Safety and Reliability
5.6 Repairs
5.7 Design Methods
5.8 Dimensions and Weight
5.9 Cost
5.10 GBHE Experience
6 TYPES OF EXCHANGER
6.1 Shell and Tube Exchangers
6.2 Cylindrical Graphite Block Heat Exchangers
6.3 Cubic Graphite Block Heat Exchangers
6.4 Air Cooled Heat Exchangers
6.5 Gasketed Plate and Frame
6.6 Spiral Plate
6.7 Tube in Duct
6.8 Plate-fin
6.9 Printed Circuit Heat Exchanger (PCHE)
6.10 Scraped Surface/Wiped Film Exchangers
6.11 Welded or Brazed Plate
6.12 Double Pipe
6.13 Electric Heaters
6.14 Fired Process Heaters
TABLE
(1) ADVANTAGES AND DISADVANTAGES OF DIFFERENT SHELL AND TUBE DESIGNS
FIGURES
1 ESTIMATED MAIN PLANT ITEM COSTS
2 ESTIMATED INSTALLED COSTS
3 TEMA HEAT EXCHANGER NOMENCLATURE
4 F ‘CORRECTION FACTORS' : TEMA E SHELL WITH EVEN NUMBER OF PASSE
5 SHELL AND TUBE HEAT EXCHANGER HEAD TYPES
6 GENERAL ARRANGEMENT OF A CYLINDRICAL GRAPHITE BLOCK HEAT EXCHANGER
7 EXPLODED VIEW OF A CUBIC GRAPHITE BLOCK
HEAT EXCHANGER
8 TYPICAL AIR COOLED HEAT EXCHANGER
9 GENERAL VIEW OF ONE END OF A 3-STREAM
PLATE-FIN HEAT EXCHANGER
10 TYPICAL PCHE PLATE
11 VICARB ‘COMPABLOC' EXCHANGER
12 ‘BROWN FINTUBE' MULTITUBE HEAT EXCHANGER
13 FIRED HEATER : SCHEMATICS AND NOMENCLATURE
AIR COOLED HEAT EXCHANGER
The document discusses air cooled heat exchangers. It describes how air cooled heat exchangers work by using air as the cooling medium, making them useful when water supply is limited. The document outlines the main components of air cooled heat exchangers, including axial fans, tube bundles, headers, fins and nozzles. It also discusses types of fans, headers, fins, factors that affect performance like fouling, and considerations for inspection and design of air cooled heat exchangers.
HTRI PRESENTATION.pdf
This document provides an overview of using HTRI software to perform thermal design of heat exchangers. It discusses specifying the geometry, process conditions, and fluid properties required for rating, designing, or simulating shell and tube heat exchangers. Key aspects covered include baffle types, temperature profiles, mean temperature differences, and outputs such as duty, heat transfer area, and pressure drop. The goal is to demonstrate the inputs and calculations used in HTRI to analyze heat exchanger performance.
Chapter 7: Heat Exchanger
Recognize numerous types of heat exchangers, and classify them.
Develop an awareness of fouling on surfaces, and determine the overall heat transfer coefficient for a heat exchanger.
Perform a general energy analysis on heat exchangers.
Obtain a relation for the logarithmic mean temperature difference for use in the LMTD method, and modify it for different types of heat exchangers using the correction factor.
Develop relations for effectiveness, and analyze heat exchangers when outlet temperatures are not known using the effectiveness-NTU method.
Know the primary considerations in the selection of heat exchangers.
Plate Type Heat Exchanger Design
This design project aims to propose a plate type heat exchanger that can meet given heat duty and find the number of plates required. Plate type heat exchanger uses metal plates to transfer heat between two fluids. Starting point of this design is to define given properties
Plate heat exchangers
A plate heat exchanger is proposed to cool methanol using brackish water. The initial design requires 97 plates with 48 channels per pass to achieve a heat duty of 4340 kW and overall heat transfer coefficient of 1754 W/m^2°C. Increasing the channels to 60 plates achieves the required coefficient of 1600 W/m^2°C with 121 plates. The pressure drops are estimated to be 0.16 bar for methanol and 0.78 bar for water.
Heat Exchanger
The document discusses unit operations in food process engineering. It describes the objectives as studying principles and laws governing physical, chemical, or biochemical process stages and related equipment. It classifies unit operations into physical, chemical, and biochemical stages involving operations like grinding, sieving, filtration, and fermentation. It also discusses mass transfer, heat transfer, and simultaneous mass-heat transfer unit operations. The document then focuses on heat exchangers, describing types like plate, tubular, and shell-and-tube heat exchangers. It discusses parameters for heat exchanger design like overall heat transfer coefficient, log mean temperature difference, and fouling factor.
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applications of the principles of heat transfer to design of heat exchangers
applications of the principles of heat transfer to design of heat exchangers
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This document provides an overview of gasketed plate heat exchangers. It describes their construction using metal plates separated by gaskets to transfer heat between two fluids without mixing. The fluids flow in alternating passages formed between packed plates in a corrugated pattern that induces turbulence to enhance heat transfer. Key design considerations discussed include mean flow gap, hydraulic diameter, heat transfer coefficient, mass velocity, pressure drop, overall heat transfer coefficient, and heat transfer surface area.
Analysis of Heat Transfer in Spiral Plate Heat Exchanger Using Experimental a...
Heat transfer is the key to several processes in industrial application. In a present days maximum efficient heat transfer equipment are in demand due to increasing energy cost. For achieving maximum heat transfer, the engineers are continuously upgrading their knowledge and skills by their past experience. Present work is a skip in the direction of demonstrating the use of the computational technique as a tool to substitute experimental techniques. For this purpose an experimental set up has been designed and developed. Analysis of heat transfer in spiral plate heat exchanger is performed and same Analysis of heat transfer in spiral plate heat exchanger can be done by commercially procurable computational fluid dynamic (CFD) using ANSYS CFX and validated based on this forecasting. Analysis has been carried out in parallel and counter flow with inward and outward direction for achieving maximum possible heat transfer. In this problem of heat transfer involved the condition where Reynolds number again and again varies as the fluid traverses inside the section of flow from inlet to exit, mass flow rate of working fluid is been modified with time. By more and more analysis and experimentation and systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward parallel flow configuration compared to all other counterparts, which observed to vary with small difference in each section. Furthermore, for the increase heat transfer rate in spiral plate heat exchanger is obtain by cascading system.
Heat Exchanger
A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids flowing in opposite directions. It consists of many corrugated metal plates clamped together in a frame to create channels for fluid flow. Plate heat exchangers offer benefits like high heat transfer efficiency in a compact design, but are limited to lower pressures and flow rates than some other heat exchanger types. They are widely used in industrial processes for applications like heating and cooling.
Type of heat exchanger
Type of heat exchanger. Which is mainly used in food industries, like dairy plant, for the pasturization, heat treatment of the beavrages or liquid raw material.
Heat-Exchanger-Classification-and-Selection-II.pdf
The document discusses several types of heat exchangers. It describes how spiral plate heat exchangers (SPHEs) are fabricated by rolling pairs of plates to form spiral passages with maintained spacing. It notes advantages for handling slurries up to 50% solid content and viscosities up to 500,000 cp. Applications include reboiling, condensing, and heating or cooling viscous fluids.
plate heate exchanger
Plate heat exchangers use thin corrugated plates pressed from metal to induce turbulence and improve heat transfer efficiency. They have overall heat transfer coefficients 3-4 times higher than shell and tube heat exchangers. This allows for more compact equipment but also higher pressure drops. Plate heat exchangers are classified as gasketed, brazed, or welded based on how the plates are joined together. Their design involves matching the thermal length requirement of each fluid to the characteristic of the plate channel geometry.
heat exchangers
This document provides information on different types of heat exchangers:
- Multiple pass heat exchangers allow fluids to pass each other more than once using U-bend tubes or shell-side baffles, improving heat transfer.
- Plate heat exchangers use corrugated metal plates separated by gaskets to transfer heat between fluids in alternating channels. They are compact and efficient.
- Scraped surface heat exchangers have an internal rotating cylinder fitted with blades that continuously scrape the heating surface, used for viscous fluids.
- Double pipe heat exchangers consist of two concentric pipes for countercurrent flow, used in boilers, coolers, condensers and evaporators.
Mel709 39
Plate heat exchangers have thin, corrugated plates that induce turbulence and minimize fouling. They offer higher heat transfer coefficients than shell and tube exchangers, resulting in more compact equipment. Plate heat exchangers come in gasketed, brazed, and welded designs. Gasketed plate heat exchangers use pressed metal plates with gaskets to separate fluid channels. They are the most common type of plate heat exchanger.
CPD - PHE's Principles _ Applications(1) - High Res.pdf
This document provides an overview of plate heat exchangers, including their principles and applications. It discusses the types of plate heat exchangers, heat transfer principles, turbulent vs laminar flow, co-current vs counter-current flow, and pressure drop. Applications covered include sizing plate heat exchangers, packaged plate heat exchangers for domestic hot water generation, instantaneous and semi-instantaneous systems, and service and maintenance considerations.
Fertilizer international heat-exchanger
Heat exchangers transfer heat from one medium to another and come in many designs. Shell and tube heat exchangers consist of tubes bundled together within a shell and are commonly used for high pressure and temperature applications. Plate heat exchangers use thin, stacked plates to transfer heat efficiently in a compact space. Selection of the appropriate heat exchanger design considers factors like pressure limits, thermal performance, materials, and cost. Heat exchangers play an important role in many industrial processes like ammonia production.
Design of fin plate heat exchanger
What is heat exchanger & its Functions
Types of Heat Exchangers
Compact Heat Exchangers
Part of Fin Plate Heat Exchangers
Advantages & Disadvantages of Fin Plate Exchangers
Materials & Manufacturing
Overall Heat transfer Coefficient & Fouling Factor
LMTD Method
Effectiveness - NTU Method
Heat Exchangers
This document discusses heat exchangers, specifically double pipe and shell and tube heat exchangers. It defines heat exchangers as devices used to transfer heat between fluids or between fluids and solids. It then describes the basic construction and working principles of double pipe heat exchangers, including their applications in areas like aircraft and commercial uses. The document also briefly introduces shell and tube heat exchangers.
heat exchanger
A heat exchanger transfers heat between two fluids through conduction. It can transfer heat between fluids that never mix by using a solid wall, or between directly contacted fluids. Heat exchangers are widely used in applications like HVAC, power plants, refineries, and manufacturing. They are classified based on construction and flow configuration, with shell-and-tube and plate heat exchangers being most common. Proper design considers factors like heat transfer rate, pressure drop, fouling, and effectiveness.
Heat Exchangers
This document provides an overview of different types of heat exchangers. It begins with an introduction to heat exchangers and their basic functions. It then describes several common types of heat exchangers including recuperators, regenerators, plate heat exchangers, shell and tube heat exchangers, and fin tube heat exchangers. It also discusses potential problems with heat exchangers such as fouling and corrosion and provides some precautions and considerations for heat exchanger design and cost.
IRJET- Analysis of Shell and Tube Heat Exchangers
The document analyzes the design and performance of shell and tube heat exchangers. It discusses the components of shell and tube heat exchangers including tubes, tube sheets, baffles, and nozzles. It also describes three common types of shell and tube exchangers: fixed tube sheet, U-tube, and floating head. The document then analyzes the performance of a shell and tube heat exchanger model made of brass with and without baffles using structural and thermal simulations. The results show that heat transfer rate and stresses are lower for the model with baffles compared to without baffles. Brass is also found to have lower stresses than other materials like carbon steel and stainless steel.
CFD Analysis of Heat Transfer Enhancement in Shell and Tube Type Heat Exchang...
Shell and Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre-heaters. Shell and Tube heat exchanger is one such heat exchanger, provides more area for heat transfer between two fluids in comparison with other type of heat exchanger. To intensify heat transfer with minimum pumping power innovative heat transfer fluids called Nano fluids have become the major area of research now a days. The primary aim is to evaluate the effect of different weight concentration and temperatures on convective heat transfer. Increasing the weight concentration and temperatures leads to enhancement of convective heat transfer coefficient. In the present, work attempts are made to enhance the heat transfer rate in shell and tube heat exchangers. A multi pass shell and tube heat exchanger with 3 tubes with fins modelling is done using ANSYS. Nanofluid such as Al2O3-H2O is used. The CFD simulated results achieved from the use of the creating fin in tube side in shell and tube type heat exchanger are compared with without fin. Based on the results, providing fins on tube causes the increment of overall heat transfer coefficient which results in the enhancement of heat transfer rate of heat exchanger. Sudhanshu Pathak | H. S. Sahu"CFD Analysis of Heat Transfer Enhancement in Shell and Tube Type Heat Exchanger creating Triangular Fin on the Tubes" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14259.pdf http://www.ijtsrd.com/engineering/mechanical-engineering/14259/cfd-analysis-of-heat-transfer-enhancement-in-shell-and-tube-type-heat-exchanger-creating-triangular-fin-on-the-tubes/sudhanshu-pathak
Heat transfer
This document provides an overview of heat transfer principles and their application to the design of heat exchangers. It discusses the three main modes of heat transfer (conduction, convection, and radiation) and introduces concepts like heat transfer coefficients. Design considerations for shell and tube heat exchangers are covered, including sizing standards, tube/shell geometry, baffling, and hydraulic performance. Methods for designing single-phase and multiphase exchangers are presented, such as Kern's method and Bell's method. The document concludes with brief discussions on condenser, reboiler, and air cooler design.
Basics of heat transfer
This document provides an overview of heat transfer principles and heat exchanger design. It begins with definitions of the various heat transfer mechanisms - conduction, convection and radiation. It then discusses key concepts in heat exchanger design including overall heat transfer coefficients, sizing standards, thermal and hydraulic design methods, design of different heat exchanger types like condensers and reboilers, and mechanical design considerations. The document serves as a reference for fundamental heat transfer concepts and guidelines for designing common heat exchanger equipment.
Food engineering assignment
This document discusses different types of heat exchangers used in food processing. It begins by defining heat exchangers and their purpose in food processing applications such as heating, cooling, and heat exchange between food streams. The main types discussed include plate heat exchangers, scraped surface heat exchangers, double pipe heat exchangers, multiple pass heat exchangers, and tubular heat exchangers. Key differences between types include direct contact vs non-contact heat transfer and flow configurations like co-current vs counter-current. Advantages and uses of each type are also summarized.
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- 1. DESIGN CONSIDERATIONS FOR PLATE TYPE HEAT EXCHANGER Arun S CHEMICAL ENGINEERING
- 2. What is a plate type heat exchanger? It’s a type of Heat Exchanger which consists of many corrugated stainless-steel sheets separated by polymer gaskets and clamped into a steel frame •Plate heat exchangers transfer heat by placing thin, corrugated metal sheets side by side and connecting them by gaskets. •Flow of the substances to be heated and cooled takes place between alternating sheets allowing heat to transfer through the metal sheets.
- 3. Assembly Instead of pipe passing through chamber, there are two alternate chambers separated by a corrugated plate Plates are usually spaced by rubber gaskets The plates are pressed to form troughs at right angles to the direction of flow of liquid which runs through the channel Plates produce a large surface area ensuring maximum heat transfer The number and size of the plates are determined by the flow rate, physical properties of the fluids, pressure drop, and temperature Mainly two forms of corrugations are seen ◦ Intermating corrugations ◦ Chevron corrugations
- 4. The frame and the channel plates have portholes that allow process fluids to enter altenating flow patterns These narrow gaps and high number of contact points which change fluid flow direction combine to create a very high turbulence between the plates. For a liquid-liquid heat exchanger whose usual fluid velocity is 0.2 to 1 m/s, the Reynolds No will be< 2100, but due to the presence of corrugations the turbulent characteristics are achieved even at NRe say about 400-500. Evidence of Turbulent characteristics is obtained by measuring heat transfer coefficient which varies with 0.6 to 0.8 power of flow rate and pressure which varies with 1.7 to 2 power of the flow rate General Dimensions of PHE
- 5. Why Plate Heat Exchanger? High heat transfer area High heat transfer coefficient Compact and has lower floor space requirements. By increasing the number of plates the area of heat exchange can be increased Most suitable type heat exchangers for lower flow rates and heat sensitive substances. Multiple duties can be performed by a single un
- 6. Design using correlations From the APV heat transfer handbook- Design and Application of Paraflow- Plate Heat exchangers there are following correlations for PHEs: Where Np is the number of passages w is the width of the plate W is the mass flow rate G is the mass velocity
- 7. Design using charts Only limited design correlations are available for the design of Plate heat exchanger So the preliminary design is on the basis of certain charts by the manufacturers. As per designing of plate and frame filter press by Christopher Haslego, they introduced a set of certain charts which form the basis of preliminary design. The use of the charts were on the basis of following points: ◦ Applicable for liquid-liquid design ◦ Valid for only single pass units ◦ Thermal conductivity of wetted material is same as that of SS ◦ For fluids with viscosity between 100cP to 500 cP , the 100 cP line in the graph should be used.
- 8. A = q/U LMTDF. the number of plates from, N=A/Ap, where A, is the area of a plate
- 11. Plate Fin Type Exchanger
- 12. Limitations….. Cost factor is on the higher side as most of the parts are made of SS. Not suitable for liquids with high viscosity and suspended matters. Often Fouling in plates, leads to requirement of intermittent cleaning and this reduces the life of gaskets. Large difference in fluid flow rates cannot be handled.
- 13. Applications Widely used in diary and food processing industries A whole heat exchange network can be condensed to a plate heat exchanger Pasteurisation of milk uses the plate heat exchanger with three- four sections Also used in food and cosmetics industries.
- 14. References Perry’s Chemical Engineering Handbook ,8th Edition,Don.W.Green, Robert.H Perry Unit Operations of Chemical Engineering, Seventh Edition, Warren.L.McCabe, Julian.C.Smith Designing Plate and Frame Heat Exchanger, Christopher Haslego and Graham Polley