This document is a project report on the design and construction of a double pipe heat exchanger. It includes sections on heat transfer fundamentals, the objectives of determining the log mean temperature difference (LMTD), efficiency, and overall heat transfer area of the exchanger. The report describes the key components, working procedure, advantages, and applications of a double pipe heat exchanger. The project aims to build the most common type of heat exchanger to study its heat transfer capabilities.
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow). The results show that overall heat transfer coefficients increase with increasing inner Dean number and mass flow rates. Heat transfer rates also increase with higher inner mass flow rates. Counter flow configuration provides better heat transfer than parallel flow. Increasing the inner tube size decreases the total heat transfer rate due to a reduction in annulus cross-sectional area. Measured inner Nusselt numbers agree reasonably well with existing correlations.
Parallel flow heat exchanger is analysed with CFD tool. A comparative study of the analytical and experimental data is carried out to better understand the temperature profile, surface heat flux and heat transfer co-efficient parameters of the heat exchanger
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGERhemantnehete
Heat exchangers are the important engineering systems with wide variety of applications including power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, chemical processing and food industries. Helical coil configuration is very effective for heat exchangers and chemical reactors because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficients. This project focus on an increase in the effectiveness of a heat exchanger and analysis of various parameters that affect the effectiveness of a heat exchanger and also deals with the performance analysis of heat exchanger by varying various parameters like number of coils, flow rate and temperature. The results of the helical tube heat exchanger are compared with the straight tube heat exchanger in both parallel and counter flow by varying parameters like temperature, flow rate of cold water and number of turns of helical coil.
Esign and thermal evaluation of shell and helical coil heat exchangereSAT Journals
Abstract
Heat exchangers are the important engineering equipments used for transferring heat from one fluid to another. Heat exchangers are widely used in various kinds of application such as power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, petrochemical, mechanical, biomedical industries. Helical coil heat exchangers are gaining wide importance now-a-days because it can give high heat transfer coefficient in small footprint of surface area. This paper focuses on the designing of shell and helical coil heat exchanger and its thermal evaluation with counter flow configuration. The thermal analysis is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient.
Keywords— Helical coil heat exchanger, Counter flow, Flow rate, effectiveness, heat transfer coefficient etc.
This document describes a heat exchanger design project. It provides theory on heat exchanger design including heat transfer rate calculations. It then details the CFD simulation process used to model and analyze different heat exchanger designs. This included an initial 2D model, mesh refinement studies to determine optimal mesh size, and modeling variations in pipe spacing, flow direction, and a 3D design. Results were analyzed using temperature, turbulence, and velocity contours to evaluate design performance.
Helically Coiled Tube with Different Geometry and Curvature Ratio on Convecti...AM Publications
A helically coil-tube heat exchanger is generally applied in industry applications due to its compact structure, larger heat transfer area and higher heat transfer capability. Several studies from literature have also indicated that heat transfer rate in helically coiled tube are superior to straight tube due to complex flow pattern exist inside helical pipe. The concept behind compact heat exchanger is to decrease size and increase heat load which is the typical feature of modern helical tube heat exchanger. While the heat transfer characteristics of helical coil heat exchangers are available in the literature, This paper elaborates a brief review on different curvature ratio and geometry of tubes in heat transfer through heat exchangers.
Optimization of a Shell and Tube Condenser using Numerical MethodIJERA Editor
The purpose of this study was to investigate the effect of installation of the tube external surfaces, their parameter and variable in a shell-and-tube condenser. Variation of heat transfer coefficient with each variable of shell and tube condenser was measured each test. The optimization tube outside diameter size was analyzed and use extended surface area attached tube with tube material and tube layout and arrangement (Number of tube a triangular or hexagonal arrangement) on shell-and tube condenser. The computer programming was used to get faster output in less time. Results suggest that mean heat transfer coefficient in variable condition were mainly at velocity is fixed. And also average additional surfaces and tube layout and the arrangement comparison with the quantity of the heat transfer.
Heat exchangers are used widely in industrial application such as chemical,
food processing, power production, refrigeration and air-conditioning
industries. Helical coiled heat exchangers are used in order to obtain a large
heat transfer per unit volume and to enhance the heat transfer rate on the inside
surface. In the present study, CFD simulations are carried out for a counter
flow tube in tube helical heat exchanger where hot water flows through the
inner tube and cold water flows through the outer tube. From the simulation
results heat transfer coefficient, pressure drop and nusselt number are
calculated. The heat transfer characteristics of the same are compared with that
of a counter flow tube in tube straight tube heat exchanger of same length
under same temperature and flow conditions. CFD simulation results showed
that the helical tube in tube heat exchanger is more effective than the straight
tube in tube heat exchanger.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...iosrjce
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow). The results show that overall heat transfer coefficients increase with increasing inner Dean number and mass flow rates. Heat transfer rates also increase with higher inner mass flow rates. Counter flow configuration provides better heat transfer than parallel flow. Increasing the inner tube size decreases the total heat transfer rate due to a reduction in annulus cross-sectional area. Measured inner Nusselt numbers agree reasonably well with existing correlations.
Parallel flow heat exchanger is analysed with CFD tool. A comparative study of the analytical and experimental data is carried out to better understand the temperature profile, surface heat flux and heat transfer co-efficient parameters of the heat exchanger
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGERhemantnehete
Heat exchangers are the important engineering systems with wide variety of applications including power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, chemical processing and food industries. Helical coil configuration is very effective for heat exchangers and chemical reactors because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficients. This project focus on an increase in the effectiveness of a heat exchanger and analysis of various parameters that affect the effectiveness of a heat exchanger and also deals with the performance analysis of heat exchanger by varying various parameters like number of coils, flow rate and temperature. The results of the helical tube heat exchanger are compared with the straight tube heat exchanger in both parallel and counter flow by varying parameters like temperature, flow rate of cold water and number of turns of helical coil.
Esign and thermal evaluation of shell and helical coil heat exchangereSAT Journals
Abstract
Heat exchangers are the important engineering equipments used for transferring heat from one fluid to another. Heat exchangers are widely used in various kinds of application such as power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, petrochemical, mechanical, biomedical industries. Helical coil heat exchangers are gaining wide importance now-a-days because it can give high heat transfer coefficient in small footprint of surface area. This paper focuses on the designing of shell and helical coil heat exchanger and its thermal evaluation with counter flow configuration. The thermal analysis is carried out considering the various parameters such as flow rate of cold water, flow rate of hot water, temperature, effectiveness and overall heat transfer coefficient.
Keywords— Helical coil heat exchanger, Counter flow, Flow rate, effectiveness, heat transfer coefficient etc.
This document describes a heat exchanger design project. It provides theory on heat exchanger design including heat transfer rate calculations. It then details the CFD simulation process used to model and analyze different heat exchanger designs. This included an initial 2D model, mesh refinement studies to determine optimal mesh size, and modeling variations in pipe spacing, flow direction, and a 3D design. Results were analyzed using temperature, turbulence, and velocity contours to evaluate design performance.
Helically Coiled Tube with Different Geometry and Curvature Ratio on Convecti...AM Publications
A helically coil-tube heat exchanger is generally applied in industry applications due to its compact structure, larger heat transfer area and higher heat transfer capability. Several studies from literature have also indicated that heat transfer rate in helically coiled tube are superior to straight tube due to complex flow pattern exist inside helical pipe. The concept behind compact heat exchanger is to decrease size and increase heat load which is the typical feature of modern helical tube heat exchanger. While the heat transfer characteristics of helical coil heat exchangers are available in the literature, This paper elaborates a brief review on different curvature ratio and geometry of tubes in heat transfer through heat exchangers.
Optimization of a Shell and Tube Condenser using Numerical MethodIJERA Editor
The purpose of this study was to investigate the effect of installation of the tube external surfaces, their parameter and variable in a shell-and-tube condenser. Variation of heat transfer coefficient with each variable of shell and tube condenser was measured each test. The optimization tube outside diameter size was analyzed and use extended surface area attached tube with tube material and tube layout and arrangement (Number of tube a triangular or hexagonal arrangement) on shell-and tube condenser. The computer programming was used to get faster output in less time. Results suggest that mean heat transfer coefficient in variable condition were mainly at velocity is fixed. And also average additional surfaces and tube layout and the arrangement comparison with the quantity of the heat transfer.
The document summarizes an experiment to determine heat transfer coefficients in a cross-flow plate heat exchanger under both continuous and batch operations. For continuous operation, the heat transfer rate and coefficient increased with increasing cold water flow rate. The heat transfer coefficient was highest at around 5 gallons per minute. For batch operation, the heat transfer coefficient was determined to be 7490 ± 300 W/m2K using linear regression modeling, which was higher than continuous operation. Heat losses to the environment likely contributed to the lower coefficient in continuous operation compared to batch.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
The document summarizes an experimental study comparing the performance of a helical coil heat exchanger to a straight tube heat exchanger. Researchers designed, fabricated, and tested both types of heat exchangers. Results showed that the helical coil design had higher heat transfer rates, effectiveness, and overall heat transfer coefficients than the straight tube design across all flow rates and operating conditions. This is because the coiled tube shape induces secondary fluid flows that enhance mixing and heat transfer compared to the straight tube. The study concludes that helical coil heat exchangers have better performance than straight tube designs for industrial heat exchange applications.
This document discusses various types of heat exchangers including shell-and-tube, double-pipe, plate-and-frame, fired heaters, and aerial coolers. It provides details on shell-and-tube exchangers including baffles, tube layout, and TEMA classifications. Examples are given for sizing problems including determining heat duty, selecting the exchanger type, and calculating the number of tubes needed. Common software for heat exchanger design is also listed.
This document discusses heat exchangers and includes the following key points:
- It describes different types of heat exchangers including concentric-tube, cross-flow, shell-and-tube, and compact heat exchangers.
- It discusses the overall heat transfer coefficient and factors that influence it such as convection, conduction, fins, and fouling.
- It introduces the log mean temperature difference (LMTD) method for calculating heat transfer in heat exchangers and how LMTD is evaluated for different flow configurations.
- It provides an example problem demonstrating how to determine the overall heat transfer coefficient and heat transfer rate for a heat recovery device.
Review on Comparative Study between Helical Coil and Straight Tube Heat Excha...IOSR Journals
The purpose of this study is to determine the relative advantage of using a helically coiled heat
exchanger against a straight tube heat exchanger. It is found that the heat transfer in helical circular tubes is
higher as compared to Straight tube due to their shape. Helical coils offer advantageous over straight tubes due
to their compactness and increased heat transfer coefficient. The increased heat transfer coefficients are a
consequence of the curvature of the coil, which induces centrifugal forces to act on the moving fluid, resulting in
the development of secondary flow. The curvature of the coil governs the centrifugal force while the pitch (or
helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the
development of secondary flow. Due to the curvature effect, the fluid streams in the outer side of the pipe moves
faster than the fluid streams in the inner side of the pipe. The difference in velocity sets-in secondary flows,
whose pattern changes with the Dean number of the flow.
In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall
heat transfer coefficient, effect of coldwater flow rate on effectiveness of heat exchanger when hot water mass
flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept
constant studied and compared for parallel flow, counter flow arrangement of Helical coil and Straight tube
heat exchangers. The inner heat transfer coefficient calculated from Wilson plot method. Then Nusselt no and
correlation obtained on the basis of inner heat transfer coefficient. All readings were taken at steady state
condition of heat exchanger.
The result shows that the heat transfer coefficient is affected by the geometry of the heat exchanger.
Helical coil heat exchanger are superior in all aspect studied here.
This document discusses heat exchangers and their analysis. It begins by listing the objectives of classifying heat exchangers, determining heat transfer coefficients, and analyzing heat exchangers using effectiveness-NTU and LMTD methods. Several types of heat exchangers are then described, including compact, shell-and-tube, regenerative, plate-frame, and condensers/boilers. Methods for determining overall heat transfer coefficient and fouling factors are provided. The document concludes by explaining the LMTD and effectiveness-NTU methods for analyzing heat exchangers.
Analysis of Coiled-Tube Heat Exchangers to Improve Heat Transfer Rate With Sp...IJMER
Steady heat transfer enhancement has been studied in helically coiled-tube heat exchangers. The outer side of the wall of the heat exchanger contains a helical corrugation which makes a helical rib on the inner side of the tube wall to induce additional swirling motion of fluid particles. Numerical calculations have been carried out to examine different geometrical parameters and the impact of flow and thermal boundary conditions for the heat transfer rate in laminar and transitional flow regimes. Calculated results have been compared to existing empirical formula and experimental tests to investigate the validity of the numerical results in case of common helical tube heat exchanger and additionally results of the numerical computation of corrugated straight tubes for laminar and transition flow have been validated with experimental tests available in the literature. Comparison of the flow and temperature fields in case of common helical tube and the coil with spirally corrugated wall configuration are discussed. Heat exchanger coils with helically corrugated wall configuration show 80–100% increase for the inner side heat transfer rate due to the additionally developed swirling motion while the relative pressure drop is 10–600% larger compared to the common helically coiled heat exchangers. New empirical Co-relation has been proposed for the fully developed inner side heat transfer prediction in case of helically corrugated wall configuration.
Design and Development of Parallel - Counter Flow Heat ExchangerAM Publications
This document reviews literature related to parallel and counter flow heat exchangers and modifications made to improve performance. Various papers are summarized that discuss developments in parallel and counter flow heat exchangers, including using software, changing designs, tube shapes, and applying the second law of thermodynamics. Key factors like fluid velocity, Reynolds number, heat transfer coefficient, baffle spacing, and pressure drop play important roles in heat exchanger performance. The development of heat exchanger systems is important to optimize performance and reduce costs.
This document discusses a thesis that analyzes heat transfer in a helical coil heat exchanger using computational fluid dynamics (CFD). The thesis was submitted in partial fulfillment of a Bachelor of Technology degree in Mechanical Engineering. The student conducted CFD analysis using ANSYS Fluent to simulate heat transfer between fluids flowing in parallel and counter-current directions in a tube-in-tube helical coil heat exchanger. Contours, vectors, and plots of parameters like temperature, velocity, heat flux, and Nusselt number were generated to analyze heat transfer performance under varying conditions. The overall goal was to provide data on heat transfer behavior in helical coil exchangers to address the lack of experimental results available for their
Summary of lmtd and e ntu. The Log Mean Temperature Difference Method (LMTD) The Logarithmic Mean Temperature Difference(LMTD) is valid only for heat exchanger with one shell pass and one tube pass. For multiple number of shell and tube passes the flow pattern in a heat exchanger is neither purely co-current nor purely counter-current. The temperature difference between the hot and cold fluids varies along the heat exchanger. It is convenient to have a mean temperature difference Tm for use in the relation. s mQ UA T
3. The mean temperature difference in a heat transfer process depends on the direction of fluid flows involved in the process. The primary and secondary fluid in an heat exchanger process may flow in the same direction - parallel flow or cocurrent flow in the opposite direction - countercurrent flow or perpendicular to each other - cross flow
The document presents information on helical baffle heat exchangers. It begins with introducing heat exchangers and defining a helical baffle heat exchanger. It then discusses the design of helixchangers, including thermal analysis of the helical baffles and tube side as well as hydrodynamic analysis of the shell side. Overall heat transfer coefficient is also examined. Key advantages of helixchangers are reduced bypass effects, fouling, vibration, and maintenance compared to traditional shell and tube exchangers. Future areas of research include CFD optimization and analysis of flow patterns and velocities.
Storing latent heat with liquid crystals (13th european conference on liquid ...Jokin Hidalgo
Thermal energy storage a key element in thermal
processes management especially in those related
to renewable energies. When processes entail
water condensation/evaporation, the best approach
is storing energy as latent heat with phase change
materials (PCM’s) that undergo state transitions at
temperatures close to the steam working conditions
(i.e. 140ºC-340 ºC). Current PCM’s exhibit solid to
liquid transitions and have a very poor thermal
conductivity Power density of the whole storage
is reduced and power in discharge is not constant.
Experimental investigation of double pipe heat exchanger with helical fins on...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document discusses shell and tube heat exchangers. It defines a shell and tube heat exchanger as consisting of tubes mounted inside a cylindrical shell to transfer heat between two fluids without direct contact. It then classifies shell and tube heat exchangers based on flow direction as parallel, counter, or cross flow, and based on number of passes as 1-1, 1-2, or 2-4 shell and tube configurations. The document provides details on each type of classification.
The document discusses heat exchangers and fouling factors. It describes how fouling decreases heat transfer over time by creating additional thermal resistance. Fouling depends on operating conditions like temperature and fluid velocities. The types of fouling include precipitation of solids, corrosion, chemicals, and biological growth. The document also summarizes methods for analyzing heat exchangers and factors to consider when selecting a heat exchanger, such as heat transfer rate, size, cost, pumping power requirements, and materials.
Definition and Requirements
Types of Heat Exchangers
The Overall Heat Transfer Coefficient
The Convection Heat Transfer Coefficients—Forced Convection
Heat Exchanger Analysis
Heat Exchanger Design and Performance Analysis
This document provides a project report on a tri duct heat exchanger. It includes an introduction to heat transfer and functions of heat exchangers. It describes the construction and flow arrangements of a tri duct heat exchanger. The theory section discusses overall resistance to heat transfer, which includes resistance from the hot and cold fluid films and the metal wall. Dimensionless parameters like Nusselt, Reynolds and Prandtl numbers are also introduced.
This document discusses heat exchangers and provides details on shell-and-tube heat exchangers. It describes the basic components and design of shell-and-tube heat exchangers, including tubes, tube sheets, baffles, and shells. Equations for heat transfer and thermal analysis of shell-and-tube exchangers are presented. An example problem demonstrates the design calculations to determine the required heat exchanger area and fluid flow rates.
CFD ANALYSIS OF DOUBLE PIPE HEAT EXCHANGEREzhil Raj s
This document summarizes a CFD analysis of a double pipe heat exchanger. It describes the geometry of the heat exchanger with an inner copper tube and outer aluminum tube. It also discusses the meshing and boundary conditions used in the CFD model. The results show that counter-current flow has a more uniform temperature distribution and higher heat transfer rate compared to parallel flow. The conclusion is that counter-current flow is more effective for heat transfer in a double pipe heat exchanger.
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.
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.
The document summarizes an experiment to determine heat transfer coefficients in a cross-flow plate heat exchanger under both continuous and batch operations. For continuous operation, the heat transfer rate and coefficient increased with increasing cold water flow rate. The heat transfer coefficient was highest at around 5 gallons per minute. For batch operation, the heat transfer coefficient was determined to be 7490 ± 300 W/m2K using linear regression modeling, which was higher than continuous operation. Heat losses to the environment likely contributed to the lower coefficient in continuous operation compared to batch.
Experimental Investigation of a Helical Coil Heat Exchangerinventy
The document summarizes an experimental study comparing the performance of a helical coil heat exchanger to a straight tube heat exchanger. Researchers designed, fabricated, and tested both types of heat exchangers. Results showed that the helical coil design had higher heat transfer rates, effectiveness, and overall heat transfer coefficients than the straight tube design across all flow rates and operating conditions. This is because the coiled tube shape induces secondary fluid flows that enhance mixing and heat transfer compared to the straight tube. The study concludes that helical coil heat exchangers have better performance than straight tube designs for industrial heat exchange applications.
This document discusses various types of heat exchangers including shell-and-tube, double-pipe, plate-and-frame, fired heaters, and aerial coolers. It provides details on shell-and-tube exchangers including baffles, tube layout, and TEMA classifications. Examples are given for sizing problems including determining heat duty, selecting the exchanger type, and calculating the number of tubes needed. Common software for heat exchanger design is also listed.
This document discusses heat exchangers and includes the following key points:
- It describes different types of heat exchangers including concentric-tube, cross-flow, shell-and-tube, and compact heat exchangers.
- It discusses the overall heat transfer coefficient and factors that influence it such as convection, conduction, fins, and fouling.
- It introduces the log mean temperature difference (LMTD) method for calculating heat transfer in heat exchangers and how LMTD is evaluated for different flow configurations.
- It provides an example problem demonstrating how to determine the overall heat transfer coefficient and heat transfer rate for a heat recovery device.
Review on Comparative Study between Helical Coil and Straight Tube Heat Excha...IOSR Journals
The purpose of this study is to determine the relative advantage of using a helically coiled heat
exchanger against a straight tube heat exchanger. It is found that the heat transfer in helical circular tubes is
higher as compared to Straight tube due to their shape. Helical coils offer advantageous over straight tubes due
to their compactness and increased heat transfer coefficient. The increased heat transfer coefficients are a
consequence of the curvature of the coil, which induces centrifugal forces to act on the moving fluid, resulting in
the development of secondary flow. The curvature of the coil governs the centrifugal force while the pitch (or
helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the
development of secondary flow. Due to the curvature effect, the fluid streams in the outer side of the pipe moves
faster than the fluid streams in the inner side of the pipe. The difference in velocity sets-in secondary flows,
whose pattern changes with the Dean number of the flow.
In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall
heat transfer coefficient, effect of coldwater flow rate on effectiveness of heat exchanger when hot water mass
flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept
constant studied and compared for parallel flow, counter flow arrangement of Helical coil and Straight tube
heat exchangers. The inner heat transfer coefficient calculated from Wilson plot method. Then Nusselt no and
correlation obtained on the basis of inner heat transfer coefficient. All readings were taken at steady state
condition of heat exchanger.
The result shows that the heat transfer coefficient is affected by the geometry of the heat exchanger.
Helical coil heat exchanger are superior in all aspect studied here.
This document discusses heat exchangers and their analysis. It begins by listing the objectives of classifying heat exchangers, determining heat transfer coefficients, and analyzing heat exchangers using effectiveness-NTU and LMTD methods. Several types of heat exchangers are then described, including compact, shell-and-tube, regenerative, plate-frame, and condensers/boilers. Methods for determining overall heat transfer coefficient and fouling factors are provided. The document concludes by explaining the LMTD and effectiveness-NTU methods for analyzing heat exchangers.
Analysis of Coiled-Tube Heat Exchangers to Improve Heat Transfer Rate With Sp...IJMER
Steady heat transfer enhancement has been studied in helically coiled-tube heat exchangers. The outer side of the wall of the heat exchanger contains a helical corrugation which makes a helical rib on the inner side of the tube wall to induce additional swirling motion of fluid particles. Numerical calculations have been carried out to examine different geometrical parameters and the impact of flow and thermal boundary conditions for the heat transfer rate in laminar and transitional flow regimes. Calculated results have been compared to existing empirical formula and experimental tests to investigate the validity of the numerical results in case of common helical tube heat exchanger and additionally results of the numerical computation of corrugated straight tubes for laminar and transition flow have been validated with experimental tests available in the literature. Comparison of the flow and temperature fields in case of common helical tube and the coil with spirally corrugated wall configuration are discussed. Heat exchanger coils with helically corrugated wall configuration show 80–100% increase for the inner side heat transfer rate due to the additionally developed swirling motion while the relative pressure drop is 10–600% larger compared to the common helically coiled heat exchangers. New empirical Co-relation has been proposed for the fully developed inner side heat transfer prediction in case of helically corrugated wall configuration.
Design and Development of Parallel - Counter Flow Heat ExchangerAM Publications
This document reviews literature related to parallel and counter flow heat exchangers and modifications made to improve performance. Various papers are summarized that discuss developments in parallel and counter flow heat exchangers, including using software, changing designs, tube shapes, and applying the second law of thermodynamics. Key factors like fluid velocity, Reynolds number, heat transfer coefficient, baffle spacing, and pressure drop play important roles in heat exchanger performance. The development of heat exchanger systems is important to optimize performance and reduce costs.
This document discusses a thesis that analyzes heat transfer in a helical coil heat exchanger using computational fluid dynamics (CFD). The thesis was submitted in partial fulfillment of a Bachelor of Technology degree in Mechanical Engineering. The student conducted CFD analysis using ANSYS Fluent to simulate heat transfer between fluids flowing in parallel and counter-current directions in a tube-in-tube helical coil heat exchanger. Contours, vectors, and plots of parameters like temperature, velocity, heat flux, and Nusselt number were generated to analyze heat transfer performance under varying conditions. The overall goal was to provide data on heat transfer behavior in helical coil exchangers to address the lack of experimental results available for their
Summary of lmtd and e ntu. The Log Mean Temperature Difference Method (LMTD) The Logarithmic Mean Temperature Difference(LMTD) is valid only for heat exchanger with one shell pass and one tube pass. For multiple number of shell and tube passes the flow pattern in a heat exchanger is neither purely co-current nor purely counter-current. The temperature difference between the hot and cold fluids varies along the heat exchanger. It is convenient to have a mean temperature difference Tm for use in the relation. s mQ UA T
3. The mean temperature difference in a heat transfer process depends on the direction of fluid flows involved in the process. The primary and secondary fluid in an heat exchanger process may flow in the same direction - parallel flow or cocurrent flow in the opposite direction - countercurrent flow or perpendicular to each other - cross flow
The document presents information on helical baffle heat exchangers. It begins with introducing heat exchangers and defining a helical baffle heat exchanger. It then discusses the design of helixchangers, including thermal analysis of the helical baffles and tube side as well as hydrodynamic analysis of the shell side. Overall heat transfer coefficient is also examined. Key advantages of helixchangers are reduced bypass effects, fouling, vibration, and maintenance compared to traditional shell and tube exchangers. Future areas of research include CFD optimization and analysis of flow patterns and velocities.
Storing latent heat with liquid crystals (13th european conference on liquid ...Jokin Hidalgo
Thermal energy storage a key element in thermal
processes management especially in those related
to renewable energies. When processes entail
water condensation/evaporation, the best approach
is storing energy as latent heat with phase change
materials (PCM’s) that undergo state transitions at
temperatures close to the steam working conditions
(i.e. 140ºC-340 ºC). Current PCM’s exhibit solid to
liquid transitions and have a very poor thermal
conductivity Power density of the whole storage
is reduced and power in discharge is not constant.
Experimental investigation of double pipe heat exchanger with helical fins on...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document discusses shell and tube heat exchangers. It defines a shell and tube heat exchanger as consisting of tubes mounted inside a cylindrical shell to transfer heat between two fluids without direct contact. It then classifies shell and tube heat exchangers based on flow direction as parallel, counter, or cross flow, and based on number of passes as 1-1, 1-2, or 2-4 shell and tube configurations. The document provides details on each type of classification.
The document discusses heat exchangers and fouling factors. It describes how fouling decreases heat transfer over time by creating additional thermal resistance. Fouling depends on operating conditions like temperature and fluid velocities. The types of fouling include precipitation of solids, corrosion, chemicals, and biological growth. The document also summarizes methods for analyzing heat exchangers and factors to consider when selecting a heat exchanger, such as heat transfer rate, size, cost, pumping power requirements, and materials.
Definition and Requirements
Types of Heat Exchangers
The Overall Heat Transfer Coefficient
The Convection Heat Transfer Coefficients—Forced Convection
Heat Exchanger Analysis
Heat Exchanger Design and Performance Analysis
This document provides a project report on a tri duct heat exchanger. It includes an introduction to heat transfer and functions of heat exchangers. It describes the construction and flow arrangements of a tri duct heat exchanger. The theory section discusses overall resistance to heat transfer, which includes resistance from the hot and cold fluid films and the metal wall. Dimensionless parameters like Nusselt, Reynolds and Prandtl numbers are also introduced.
This document discusses heat exchangers and provides details on shell-and-tube heat exchangers. It describes the basic components and design of shell-and-tube heat exchangers, including tubes, tube sheets, baffles, and shells. Equations for heat transfer and thermal analysis of shell-and-tube exchangers are presented. An example problem demonstrates the design calculations to determine the required heat exchanger area and fluid flow rates.
CFD ANALYSIS OF DOUBLE PIPE HEAT EXCHANGEREzhil Raj s
This document summarizes a CFD analysis of a double pipe heat exchanger. It describes the geometry of the heat exchanger with an inner copper tube and outer aluminum tube. It also discusses the meshing and boundary conditions used in the CFD model. The results show that counter-current flow has a more uniform temperature distribution and higher heat transfer rate compared to parallel flow. The conclusion is that counter-current flow is more effective for heat transfer in a double pipe heat exchanger.
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.
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.
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.
ONGC Training on Heat Exchangers, Compressors & PumpsAkansha Jha
Plant overview, working of compressors, pumps, cooling towers, gas turbines.
Mini- Project on shell & tube type heat exchangers in ONGC, Uran plant. Hence,
calculating the effectiveness of heat exchanger using the working data.
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CFD Analysis of Heat Transfer Enhancement in Shell and Tube Type Heat Exchang...ijtsrd
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
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This document summarizes an experimental study on heat transfer in a double pipe heat exchanger with the use of wavy twisted tape inserts in the inner tube. Various wavy twisted tapes with different twist ratios were inserted into the inner copper tube to enhance turbulence and heat transfer. Temperature and pressure measurements were taken at varying flow rates and Reynolds numbers. The results showed that heat transfer, as measured by Nusselt number, increased with decreasing twist ratio of the insert. The wavy twisted tape with a twist ratio of 7.1 produced the highest 172% increase in Nusselt number but also the highest 32.11% increase in friction factor compared to the smooth tube. Correlations were developed for Nusselt number
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This paper provides heat transfer and friction factor data for single -phase flow in a shell and tube heat exchanger fitted with a helical tape insert. In the double concentric tube heat exchanger, hot air was passed through the inner tube while the cold water was flowed through the annulus. The influences of the helical insert on heat transfer rate and friction factor were studied for counter flow, and Nusselt numbers and friction factor obtained were compared with previous data (Dittus 1930, Petukhov 1970, Moody 1944) for axial flows in the plain tube. The flow considered is in a low Reynolds number range between 2300 and 8800. A maximum percentage gain of 165% in heat transfer rate is obtained for using the helical insert in comparison with the plain tube.
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This document discusses heat transfer enhancement in a shell and tube heat exchanger using a conical tape insert. It provides heat transfer and friction factor data from experiments using the heat exchanger fitted with a helical tape insert. Hot air was passed through the inner tube while cold water flowed in the annulus. The helical insert increased heat transfer rate by up to 165% compared to the plain tube, with some increase in pressure drop. Equations and calculations are provided for determining heat transfer coefficients, pressure drops, and other parameters on both the shell and tube sides of the heat exchanger. Graphs of results are also presented.
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ACKNOWLEDGEMENT
We would like to express profound gratitude and appreciation to our
project guide Dr. H.R GHATAK and our project in-charge Dr. AMIT
RAY for his invaluable support, encouragement, supervision and useful
suggestions throughout the project work. His moral support and
continuous guidance enabled us to overcome our dough and complete
our work successfully
We are grateful for the cooperation and constant encouragement
from our honorable Head of Department of chemical technology Mr.
S.M. Ahuja. His regular suggestions made our work easy and proficient.
Last but not least, I am thankful and indebted to all the faculty
members of chemical department and friends who helped us directly or
indirectly in completion of this project.
Thanks to all
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ABSTRACT
A heat exchanger may be defined as equipment which transfers the
energy from a hot fluid to a cold fluid, with maximum rate and
minimum investment and running cost. The rate of transfer of heat
depends on the conductivity of the dividing wall and convective heat
transfer coefficient between the wall and fluids. They are commonly
used in practice in a wide range of applications, from heating and air-
conditioning systems in a household, to chemical processing and power
production in large plants.
This project aims to construct the most common type of heat exchanger
“DOUBLE PIPE HEAT EXCHANGER”.
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CERTIFICATION
SANT LONGOWAL INSTITUTE OF
ENGINEERING & TECHNOLOGY
This is to certify that work presented in the project titled ‘DESIGN OF
DOUBLE PIPE HEAT EXCHANGER’ submitted to the department of
Chemical Technology of SLIET is an authentic record of our own work
carried out during the period of 6th semester under supervision of project
guide Dr. H.R GHATAK, Department of Chemical Technology, SLIET.
RAJNI KANT (DCT/1411003) …………….
PANKAJ KUMAR (DCT/1411045) .…………....
………………………… ……………………….
(Sign. Of Project In-charge) (Sign. Of Project Guide)
…………………………….
(Sign. Of H.O.D.)
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CONTENTS
Ch. no Title
1. INTRODUCTION
1.1 Definition of heat transfer.
1.2 Various modes of heat transfer.
1.3 Heat exchanger.
1.4 Classification of heat exchangers.
2. INTRODUCTION ABOUT DOUBLE PIPE HEAT
EXCHANGER
2.1 Double Pipe Heat Exchanger Design
2.2 Introduction
2.3 General configuration and characteristics of double pipe
2.4 Counter flow and parallel flow in a double pipe exchanger.
3. OBJECTIVE
3.1 LMTD
3.2 EFFICIENCY
3.2 OVERALL HEAT TRANSFER AREA
4. EQUIPMENTS AND THEIR SPECIFICATION
5. WORKING PROCEDURE OF DOUBLE PIPE HEAT
EXCHANGER
5.1 Experimental setup
5.2 Procedure
5.3 calculation
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1.1 HEAT TRANSFER
Heat transfer, also referred to simply as heat, is the movement of thermal
energy from one thing to another thing of different temperature. These
objects could be two solids, a solid and a liquid or gas, or even within a
liquid or gas. There are three different ways the heat can transfer:
conduction (through direct contact), convection (through fluid
movement), or radiation (through electromagnetic waves). Heat transfer
occurs when the temperatures of objects are not equal to each other and
refers to how this difference is changed to an equilibrium state.
Thermodynamics then deals with things that are in the equilibrium state.
OR
Simply we can say heat transfer is energy transfer due to temperature
difference.
OR
Temperature represents the amount of thermal energy available with the
molecules of substances.
HEAT FLUX
Heat flux or thermal flux is the rate of heat energy transfer through a
given surface per unit time. The SI derived unit of heat rate is joule per
second, or watt. Heat flux density is the heat rate per unit area.
In SI units, heat flux density is measured in [W/m2]. The dimensional
unit is [MT -3].heat rate is a scalar quantity, while heat flux is
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a Victoria quantity. To define the heat flux at a certain point in space,
one takes the limiting case where the size of the surface becomes
infinitesimally small.
1.2 VARIOUS HEAT TRANSFER MODES: -
There are three types of heat transfer modes
1. Convection
2. Conduction
3. Radiation
1. CONVECTION
Convection is a transfer of heat energy between a solid surface and
the nearby liquid or gas in motion.
The presence of bulk motion
fluid is necessary.
2. CONDUCTION
Conduction refers to the heat transfer that occurs across the
medium.
Medium can be solid be or fluid and heat occurring through the
matter without bulk motion of the matter
3. RADIATION
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Radiation takes places intervening. There is net heat transfer
between two surfaces at different temperature
HEAT EXCHANGER
A heat exchanger may be defined as equipment which transfers
the energy from a hot fluid to a cold fluid, with maximum rate and
minimum investment and running cost. The rate of transfer of heat
depends on the conductivity of the dividing wall and convective
heat transfer coefficient between the wall and fluids. The heat
transfer rate also varies depending on the boundary conditions such
as adiabatic or insulated wall conditions.
1.4 CLASSIFICATION OF HEAT EXCHANGER
HEAT EXCHANGER
Recuperators Regenerators
Direct contact type Indirect contact type Fixed-matrix regenerator Rotary regenerator
Tabular Plate Extended surface Drum Type
Double Pipe Gasketed plate Plate fin Disk Type
Spiral Tube Spiral plate Tube fin
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1.1 INTRODUCTION
In double pipe heat exchanger design, an important factor is the type of
flow pattern in the heat exchanger. A double pipe heat exchanger will
typically be either counter flow or parallel flow. Cross flow just doesn't
work for a double pipe heat exchanger. The flow pattern and the
required heat exchange duty allow calculation of the log mean
temperature difference. That together with an estimated overall heat
transfer coefficient allows calculation of the required heat transfer
surface area. Then pipe sizes, pipe lengths and number of bends can be
determined.
1.2 Double Pipe Heat Exchanger Design
Double pipe heat exchanger design is rather straightforward. It uses one
heat exchanger pipe inside another. After determining the required heat
exchanger surface area, for either counter flow or parallel flow, the pipe
sizes and number of bends for the double pipe heat exchanger can be
selected.
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1.3 GENERAL CONFIGURATION AND
CHARACTE RISTICS OF A DOUBLE PIPE
A double pipe heat exchanger, in its simplest form is just one pipe inside
another larger pipe. One fluid flows through the inside pipe and the other
flows through the annulus between the two pipes. The wall of the inner
pipe is the heat transfer surface. The pipes are usually doubled back
multiple times as shown in the diagram at the left, in order to make the
overall unit more compact.
The term 'hairpin heat exchanger' is also used for a heat exchanger of the
configuration in the diagram. A hairpin heat exchanger may have only
one inside pipe, or it may have multiple inside tubes, but it will always
have the doubling back feature shown. Some heat exchanger
manufacturers advertise the availability of finned tubes in a hairpin or
double pipe heat exchanger. These would always be longitudinal fins,
rather than the more common radial fins used in a cross flow finned tube
heat exchanger.
2.4 Counter flow and Parallel Flow in a Double Pipe Heat
Exchanger
A primary advantage of a hairpin or double pipe heat exchanger is that it
can be operated in a true counter flow pattern, which is the most
efficient flow pattern. That is, it will give the highest overall heat
Transfer coefficient for the double pipe heat exchanger design.
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Double pipe heat exchangers can handle high pressures and temperatures
well. When they are operating in true counter flow, they can operate
with a temperature cross, that is, where the cold side outlet temperature
is higher than the hot side outlet temperature.
For example, in the diagrams in this section, consider Fluid 2to be the
hot fluid and Fluid 1 to be the cold fluid. Then, in the counter flow
diagram at the left, you can see that the cold side outlet temperature,
T2out, can approach the hot side entering temperature, T1in, which is
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higher than the hot side outlet temperature, T2out. For the parallel flow
shown at the right, T2out can only approach T1out; it could not be greater.
CHAPTER-3
OBJECTIVE
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LMTD (LOG MEAN TEMPERATURE DIFFRANCE)
The logarithmic mean temperature difference (also known
as log mean temperature difference or simply by
its initialize LMTD) is used to determine the temperature
driving force for heat transfer in flow systems, most notably
in heat exchangers. The LMTD is a logarithmic average of the
temperature difference between the hot and cold feeds at
each end of the double pipe exchanger. The larger the LMTD,
the more heat is transferred. The use of the LMTD arises
straightforwardly from the analysis of a heat exchanger with
constant flow rate and fluid thermal properties.
We assume that a generic heat exchanger has two ends
(which we call "A" and "B") at which the hot and cold
streams enter or exit on either side; then, the LMTD is
defined by the logarithmicmean as follows
LMTD= ∆ TA - ∆ TB
Ln (∆TA ∕ ∆TB)
OVERALL HEAT TRANSFER AREA= 𝝅𝒅𝒍
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Where
d: -diameter of inner pipe
l: -length of the inner pipe
EFFICIENCY
n𝟏 = 𝟏𝟎𝟎%
(𝐓𝟏 − 𝐓𝟐)
(𝐓𝟏 − 𝐭𝟐)
n𝟐 = 𝟏𝟎𝟎%
(𝐭𝟐 − 𝐭𝟏)
(𝐓𝟏 − 𝐭𝟐)
MEAN EFFICIENCY
nm=(n1+n2)/2
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CHAPTER-4
EQIPMENTS USE AND THERE
SPECIFICATION
A. PVC PIPE
We are using PVC pipe as
External pipe,
Length of pipe=60.96cm
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External diameter=11.13cm
B. ALUMINIUM PIPE
Aluminum pipe used
As an internal pipe or
Concentric pipe.
Length >60.96cm
External diameter =2.8cm
Internal diameter =2.6cm
We are using aluminum pipe
because of its better heat
conductivity as compares to iron.
C. MOTOR PUMP
Quantity =2pcs.
RPM=2800
Motor pump use to pumps
The water into the external
Pipe and internal pipe
D.CAPS
Quantity =2pcs
Caps are use at the both
Ends of heat exchanger
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E. BALL
Quantity=2pcs
Ball valve used at the outlet
of both of pipe.to control
the flow of heat exchanger
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CHAPTER-5
WORKING PROCEDURE OF DOUBLE
PIPE HEAT EXCHANGER
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Experimental Setup
The hot fluid is hot water, which is obtained from an electric
geyser. Cold water flows through the inner tube, in one
direction. Hot fluid is hot water, which flows through the
annulus. Control valves are provided so that direction of cold
water can be kept parallel or opposite to that of hot water. Thus,
the heat exchanger can be operated either as paralle1 or counter
flow heat exchanger. The temperatures are measured with
thermometer. Thus, the heat transfer rate, heat transfer
coefficient, LMTD and effectiveness of heat exchanger can be
calculated for both parallel and counter flow.
WORKING
First supply the electricity to the pump it would pumps the water
(hot & cold). when cold and hot water enters into the inner pipe and
outer pipe respectively. Hot water flows through the annular space
where as cold water flows through the internal pipe. because
internal pipe is made up of aluminum it will conduct some heat from
annular space hot water to internal pipe by the conduction.
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It results that an internal pipe water gains some heat form the
annular space water (which lose some temperature). And both fluids
get flash out through outlets.
PROCEDURE
i. First of all, connect the both inlets of exchanger to the motor
pumps & supply electricity.
ii. Initially measure the temperature of both (inlet & outlet)
iii. Keep the both valves opened so that arrangement in parallel
flow
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iv. Let the fluid flows through the pipes and then after 1 min. cut
the pumps supply.
v. After that take, the readings from outlets.
vi. Repeat the above procedure to get the better reading.
CALCULATION
Calculation for Logarithmic Mean Temperature Difference
(LMTD)
∆TLM =
∆𝑻𝟏−∆𝑻𝟐
𝐥𝐧[∆𝑻𝟏/∆𝑻𝟐 ]
T1= 55 T2=50°C
t1=31°C t2= 33 °C
∆T1 = 𝟓𝟓 − 𝟑𝟑 = 𝟐𝟐°𝐂 , ∆T2 = 𝟓𝟎 − 𝟑𝟏 = 𝟏𝟗°𝐂
∆TLM = 22-19
ln[𝟐𝟐/𝟏𝟗 ]
= 20.54°C
33°𝐂 COLD
OUT
50°𝐂 HOT
OUT
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CHAPTER-4
ADVANTAGES & DISADVANTAGES
OR APPLICATIONS OF DOUBLE PIPE
HEAT EXCHANGER
Advantages and Disadvantages
Advantages Disadvantages
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Suited to high pressure
applications.
Limited to low heat duties
requiring surface areas less than 47
m2
Standardization, simplifies
maintenance, servicing and
stocking of parts.
Flow pattern is strictly counter
flow; there is no cross flow.
Flexibility, units can be added or
removed as required.
As units are added on the
possibility of leakage increases
because of the number of
connections increases.
Modular type construction.
DoublePipe Heat Exchanger Applications:
Because of compact size, it can be used in applications
where space limitation is present such as marine cooling
systems, cooling of lubrication oil, central cooling and
industrial applications.
In HVACs, due to their compact structure and greater heat
transfer rate.
Used in chemical reactors because of high heat transfer
capacity.
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In cryogenic applications for liquefaction of gases.
Used in hydro carbon processing for the recovery of CO2,
cooling of liquid hydrocarbons, also used in polymer
industries for cooling purposes.
Pasteurization
Digester heating
CONCLUSION
The fabricated heat exchanger is conducted for water to water heat
transfer application. Double pipe heat exchanger has been analyzed in
terms of temperature variation.
The readings (inlet outlets temperatures after the process) obtained from
the experimental investigation of heat exchanger operated in different
temperature are calculated & presented. The tube side flow (cold water
flow) is varied and same time annular side flow rate is maintained
constant to obtained the better heat transfer.
We have done above all process through both flow (counter & co-
current) and we see that LMTD is more efficient in counter current flow
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than co-current flow as experimentally proved that the counter flow heat
exchanger is more efficient than the parallel flow.
Efficiency obtained after calculation around 21% it may be increase by
the increase the process duration or to stay the hot water into the annular
space.
NOMENCLATURE
∆TLM :- LOG MEAN TEMPEATURE DIFFRANCE
T1:- Hot water inlet
T2:- Hot water outlet
t1:- cold water inlet
t2:- cold water outlet
F:- correction factor
R:-Ratio of fall in temperature hot fluid to rise in cold fluid
P:-Heating effectiveness
ῃ1:- annular pipe efficiency
ῃ𝟐:- internal pipe efficiency
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ῃm:- Mean efficiency
REFERANCE
www.webbusterz.org
www.google.com
checalc.com/solved/doublePipe.html
Double pipe heat exchanger Wikipedia
Unit Operations of Chemical Engineering (McCabe smith)