Top PDF Design Optimization of Shell and Tube Heat Exchanger by Vibration Analysis

Design Optimization of Shell and Tube Heat Exchanger by Vibration Analysis

Design Optimization of Shell and Tube Heat Exchanger by Vibration Analysis

exchanger is an integral element of its thermal design. A proper design is one that is absolutely safe against failure of tubes due to flow induced vibration. Most sophisti- cated thermal design software packages carry out vibra- tion analysis as a routine ingredient of thermal design. This is essential since it is during thermal design that the geometry of a heat exchanger is finalized and it is this same geometry, along with flow, physical and property parameters, determines whether the given heat exchanger is safe against failure of tubes due to flow-induced vibra- tions. Flow-induced vibration is a very complex subject and involves the interplay of several parameters, many of which are not very well established. Although many cases of failure of tubes due to flow-induced vibration has been reported in the past several years, and an understanding of the factors responsible for these failures leave much to be desired. The literature depicts several interesting studies on specific facets of the vibration problem; however, very few investigations have considered the specific problems associated with shell and tube heat exchangers.
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													Vibration analysis of shell and tube heat exchanger by changing baffle spacing using chemcad

1. Vibration analysis of shell and tube heat exchanger by changing baffle spacing using chemcad

Vibration is a mechanical phenomenon. Vibration motions create unwanted sounds and so are typically unwanted. Due to vibration wastage of energy in a mechanical operation takes place. Vibration becomes a problem in heat exchangers when the intensity increases to the point that it causes some part of the exchanger to fail mechanically, upsets the process conditions, or creates a condition that endangers those who work in that area. Prolonged tube vibration with large amplitudes leads to leakage between the shell side and tube side fluids due to the mechanical failure of tubes. Tubes being the most flexible part of a heat exchanger are vulnerable to flow-induced vibration caused by the flow of fluid past them. Danger of failure arises when the frequency of the tube vibration becomes appreciably high. So, careful designs are made to minimize unwanted vibrations. Vibration Analysis (VA) in any industry aims to detect equipment faults. The shell and tube heat exchangers find their applications in a many sectors. The unsupported tube span in an STHE has major impact on the various vibration mechanisms[1]. The flow-induced vibration analysis of a shell and tube heat exchanger is an integral element of its thermal design.
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Multi Objective Optimization of Shell and Tube Heat Exchanger – A Case Study

Multi Objective Optimization of Shell and Tube Heat Exchanger – A Case Study

The existing design and the modified STHE obtained using Univariate optimization approach and ACO method results are summarized in Table 4.9. The table demonstrates that the Univariate design approach and the ACO design approach can reduce the total cost compared to the original design approach. Quantitatively, a remarkable reduction in the total cost was achieved using the Univariate approach (by 12.87 %) and the Ant Colony Optimization approach (by 37.34 %) as compared to the original design, whereas heat transfer rate increased by 45.78 % and 47.02 % by using Univariate and ACO method respectively as compared to the original design. Therefore, design optimization of modified STHE by using ACO approach can be the best choice. The results found from univariate and ACO were selected from 49 and 2,401 alternative STHEs respectively. To get the same result in univariate technique as ACO values, Univariate technique needs 2,401 trials on Excel spreadsheet. But it is tedious and takes time and also leads to input data as well as output analysis error. That is why sensitivity analysis is used to avoid this challenge.
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Design and Analysis of Oil Cooling Shell and Tube Type Heat exchanger

Design and Analysis of Oil Cooling Shell and Tube Type Heat exchanger

Andre L.H. Costa and Eduardo M. Queiroz [1] presented a paper which deals with study about the design optimization of shell-and- tube heat exchangers. The formulated problem consists of the minimization of the thermal surface area for a certain service, involving discrete decision variables. Additional constraints represent geometrical features and velocity conditions which must be complied in order to reach a more realistic solution for the process task. The optimization algorithm is based on a search along the tube count table where the established constraints and the investigated design candidates are employed to eliminate non optimal alternatives, thus reducing the number of rating runs executed.
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Temperature Analysis of Shell and Tube Heat Exchanger

Temperature Analysis of Shell and Tube Heat Exchanger

Andre L.H. Costa and Eduardo M. Queiroz [1] presented a paper which deals with study about the design optimization of shell-and-tube heat exchangers. The formulated problem consists of the minimization of the thermal surface area for a certain service, involving discrete decision variables. Additional constraints represent geometrical features and velocity conditions which must be complied in order to reach a more realistic solution for the process task.

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Design and Development of Shell & Tube Heat Exchanger for Beverage

Design and Development of Shell & Tube Heat Exchanger for Beverage

In the first part of this paper, a simplified approach to design a Shell & Tube Heat Exchanger [STHE] for beverage and process industry application is presented. The design of STHE includes thermal design and mechanical design. The thermal design of STHE involves evaluation of required effective surface area (i.e. number of tubes) and finding out log mean temperature difference [LMTD]. Whereas, the mechanical design includes the design of main shell under internal & external pressure, tube design, baffles design gasket, etc. The design was carried out by referring ASME/TEMA standards, available at the company. The complete design, fabrication, testing and analysis work was carried out at Alfa Laval (India), Ltd., Pune-12. In the second part of this paper detail view of design optimization is presented by flow induced vibration analysis [FVA].
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IJRTSM INTERNATIONAL JOURNAL OF RECENT TECHNOLOGY SCIENCE & MANAGEMENT CFD ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER USING BAFFLES WITH DIFFERENT ANGLE OF INCLINATION Karishma Jawalkar 1, Yogesh Kumar Tembhurne2 , Dr. Mohit Gangwar 3

IJRTSM INTERNATIONAL JOURNAL OF RECENT TECHNOLOGY SCIENCE & MANAGEMENT CFD ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER USING BAFFLES WITH DIFFERENT ANGLE OF INCLINATION Karishma Jawalkar 1, Yogesh Kumar Tembhurne2 , Dr. Mohit Gangwar 3

In present day shell and tube heat exchanger is the most common type heat exchanger widely use in oil refinery and other large chemical process, because it suits high pressure application. Firstly modeling done on CATIA software and the process in solving simulation consists of modeling and meshing the basic geometry of shell and tube heat exchanger using CFD package ANSYS 14.0. The objective of the project is design of shell and tube heat exchanger with series of baffles and study the flow and temperature field inside the shell using ANSYS software tools. The process in solving simulation consists of modeling and meshing the basic geometry of shell and tube heat exchanger using CFD package ANSYS 14.0. The objective of the project is design of shell and tube heat exchanger with baffle and study the flow and temperature field inside the shell using ANSYS software tools. The heat exchanger contains 5 tubes and 600 mm length shell diameter 90 mm. The helix angle of baffle will be varied from 10 0 to 20 0 . In simulation will show how the pressure vary in shell due to different helix angle and flow rate. The flow pattern in the shell side of the heat exchanger with continuous baffles was forced to be rotational and Baffles Series due to the geometry of the continuous baffles, which results in a significant increase in heat transfer coefficient per unit pressure drop in the heat exchanger.
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Failure Analysis of Tube and Shell Heat Exchanger

Failure Analysis of Tube and Shell Heat Exchanger

The excessive tube fouling usually causes performance problems. In a heat exchanger during normal operations the tube surface gets covered by deposits of ash, soot, and dirt and scale etc. This phenomenon of rust formation and deposition of fluid impurity is called fouling. Deposition of foul ants on the inside of the tube surface reduces the available flow area and increase the skin friction, causing an increase in pressure loss and decrease in heat transfer. Uneven rates of fouling of tubes usually occur in units with low flow velocity design. Uneven fouling may occur on the shell side of the tubes due to a poor baffling scheme which leads to a flow misdistribution. Highly non-uniform fouling on severely modifies the metal temperature profile in some tubes resulting in large tubes to tube sheet joint leads. Thermal stresses in the internal of the heat exchanger can cause serious degradation of heat duty. The most obvious example is failure of welds joining pass partition plates to each other and to the channel.
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Optimization of Shell and Tube Heat Exchanger

Optimization of Shell and Tube Heat Exchanger

M.Serna and A.Jimenez:[3]-They have presented a compact formulation to relate the shell-side pressure drop with the exchanger area and the film coefficient based on the full Bell–Delaware method. In addition to the derivation of the shell side compact expression, they have developed a compact pressure drop equation for the tube-side stream, which accounts for both straight pressure drops and return losses. They have shown how the compact formulations can be used within an efficient design algorithm. They have found a satisfactory performance of the proposed algorithms over the entire geometry range of single phase, shell and tube heat exchangers.
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DESIGN AND DEVELOPMENT OF SHELL AND TUBE HEAT EXCHANGER BY USING CFD

DESIGN AND DEVELOPMENT OF SHELL AND TUBE HEAT EXCHANGER BY USING CFD

Computational fluid dynamics (CFD) is a computer-based simulation method for analysing fluid flow, heat transfer, and related phenomena such as chemical reactions. This project uses CFD for analysis of flow and heat transfer (not for analysis of chemical reactions). Some examples of application areas are: aerodynamic lift and drag (i.e. airplanes or windmill wings), power plant combustion, chemical processes, heating/ventilation, and even biomedical engineering (simulating blood flow through arteries and veins). CFD analyses carried out in the various industries are used in R&D and manufacture of aircraft, combustion engines, as well as many other industrial products.
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SHELL AND TUBE HEAT EXCHANGER CFD ANALYSIS USING BAFFLES WITH DIFFERENT ANGLE OF INCLINATION

SHELL AND TUBE HEAT EXCHANGER CFD ANALYSIS USING BAFFLES WITH DIFFERENT ANGLE OF INCLINATION

In present day shell and tube heat exchanger is the most common type heat exchanger widely use in oil refinery and other large chemical process, because it suits high pressure application. Firstly modeling done on CATIA software and the process in solving simulation consists of modeling and meshing the basic geometry of shell and tube heat exchanger using CFX package ANSYS 19.2. The objective of the project is design of shell and tube heat exchanger with series of baffles and study the flow and temperature field inside the shell using ANSYS software tools. The process in solving simulation consists of modeling and meshing the basic geometry of shell and tube heat exchanger using CFD package ANSYS 19.2. The objective of the project is design of shell and tube heat exchanger with baffle and study the flow and temperature field inside the shell using ANSYS software tools. The heat exchanger contains 5 tubes and 600 mm length shell diameter 90 mm. The helix angle of baffle will be varied from 90 0 , 30 0 to 45 0 . In simulation will show how the pressure vary in shell due to different helix angle and flow rate. The flow pattern in the shell side of the heat exchanger with continuous baffles was forced to be rotational and Baffles Series due to the geometry of the continuous baffles, which results in a significant increase in heat transfer coefficient per unit pressure drop in the heat exchanger.
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Design and Computational Analysis of Shell and Tube Heat Exchanger Considering various Parameters

Design and Computational Analysis of Shell and Tube Heat Exchanger Considering various Parameters

exchanger is carried out. While going through the process we have to predict the performance of STHE. The process solving in simulation consist of modeling and meshing the basic geometry of shell and tube heat exchanger using Computational Fluid Dynamics Package using ANSYS 13.0. The slaying of heat exchanger is carried out by using the package CFD with FLUENT and after that it is compared to the existing performed values. After this an attempt has been made to know the performance of the heat exchanger by taking into account the helix baffles instead of the so used steady Segmental Baffles and hence the result so obtained has to be compared. The performance parameters related to heat exchanger like effectiveness, overall heat transfer coefficient, energy extraction rate etc., has to be reported in this work. The intent of this project is to contrive the shell tube heat exchanger with helical baffle and then study the flow and temperature field inside the shell. This type of heat exchanger contains seven tubes of diameter 20 mm and the shell length consists of 600 mm long and the diameter 90 mm. the helixes angle ranges from 0 0 to 20 0 . Here the
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Design Analysis and Performance Evaluation of Shell and Tube Heat Exchanger in Automotive Engine

Design Analysis and Performance Evaluation of Shell and Tube Heat Exchanger in Automotive Engine

Automotive engines eliminate a considerable amount of heat energy to the environment through the exhaust gas. Significant reduction of engine fuel consumption could be attained by recovering of exhaust heat by using thermoelectric generators. One of the most important issues is to develop an efficient heat exchanger which provides optimal recovery of heat from exhaust gases. The work presents a design and performance measurements of a prototype thermoelectric generator mounted on self-ignition (Diesel) engine. Using the prototype generator as a tool, benchmark studies were performed for improvements in the heat exchanger including determination of temperature distribution and heat flux density.
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Optimization of Shell & Tube Heat Exchanger by Baffle Inclination & Baffle Cut

Optimization of Shell & Tube Heat Exchanger by Baffle Inclination & Baffle Cut

ABSTRACT: Heat exchanger is an equipment for heat transfer from one medium to other. This paper deals with optimizations of shell and tube heat exchanger for maximum heat transfer, by the optimization of baffle cut & baffle angle of a particular shell and tube heat exchanger using CFD analysis. The performance of the shell and tube heat exchanger was studied by varying the parameters using CFD software package fluent. To validate the CFD algorithm the experiment was conducted on an existing single pass counter flow shell and tube heat exchanger. The optimum values obtained are baffle angle 5°, baffle cut 25%.
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Design, Analysis and Fabrication of Shell and Tube Heat
              Exchanger

Design, Analysis and Fabrication of Shell and Tube Heat Exchanger

On the basis of above study it is clear that a lot of factors affect the performance of the heat exchanger and the effectiveness obtained by the formulas depicts the cumulative effect of all the factors over the performance of the heat exchanger. It may be said that the insulation is a good tool to increase the rate of heat transfer if used properly well below the level of critical thickness. Amongst the used materials the cotton wool and the tape have given the best values of effectiveness. Moreover the effectiveness of the heat exchanger also depends upon the value of turbulence provided. However it is also seen that there does not exists direct relation between the turbulence and effectiveness and effectiveness attains its peak at some intermediate value. The ambient conditions for which the heat exchanger was tested do not show any significant effect over the heat exchanger’s performance.
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CFD Analysis of Heat Transfer Prediction for Corrugated Shell & Tube Heat Exchanger

CFD Analysis of Heat Transfer Prediction for Corrugated Shell & Tube Heat Exchanger

Abstract: Corrugated shell and corrugated tube were employed instead of smooth shell and smooth tube through a shell and tube heat exchanger in this Paper. Distinct arrangements of concave and convex type of corrugated tubes were investigated. Previous studies have focused on only thermal characteristics of corrugated tubes. Hence, in the present work heat transfer coefficient is studied for a shell and tube heat exchanger made of corrugated shell and corrugated tube by using software solid works and heat transfer rate is evaluated for different arrangements of corrugated tubes. Maximum heat transfer was observed for heat exchanger made of convex corrugated tube and concave corrugated shell. This paper mainly focuses on improving the heat transfer capability in a shell and tube heat exchanger by varying tubes geometry using solid works. Study carried out on the design of the heat exchanger and by increasing diametrical ratio to prove more heat transfer is possible.
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Thermal design of tube and shell type Heat exchanger –a review

Thermal design of tube and shell type Heat exchanger –a review

Baffles serve two important functions. They support the tubes during assembly and operation and help prevent vibration from flow induced eddies and direct the shell side fluid back and forth across the tube bundle to provide effective velocity and Heat Transfer rates. The diameter of the baffle must be slightly less than the shell inside diameter to allow assembly, but must be close enough to avoid the substantial performance penalty caused by fluid bypass around the baffles. Shell roundness is important to achieve effective sealing against excessive bypass. Baffles can be made from a variety of materials compatible with the shell side fluid. They can be punched or machined. Some baffles are made by a punch which provides a lip around the tube hole to provide more surfaces against the tube and eliminate tube wall cutting from the baffle edge. The tube holes must be precise enough to allow easy assembly and field tube replacement, yet minimize the chance of fluid flowing b etween the tube wall and baffle hole, resulting in reduced thermal performance and increased potential for tube wall cutting from vibration. Baffles do not extend edge to edge, but have a cut that allows shell side fluid to flow to the next baffled chamber. For most liquid applications, the cuts areas represent 20-25% of the shell diameter. For gases, where a lower pressure drop is desirable, baffle cuts of 40-45% is common.
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Optimization of Shell and Tube Heat Exchanger for Tube Arrangements

Optimization of Shell and Tube Heat Exchanger for Tube Arrangements

ABSTRACT: Shell and tube heat exchanger is the most common type heat exchanger widely used in oil refinery and other large chemical process, because it suits high pressure application. The objective of the paper is to study the different parameters affecting heat transfers of a shell and tube heat exchanger and optimize the shell and tube heat exchanger for maximum heat transfer using CFD analysis. Computational analysis mainly carried out in the case of baffle angle and tube arrangement. 5° baffle angle and 45° circular arrangement with 3 cm pitch show uniform tube arrangement and better heat transfer coefficient than other arrangements.
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Numerical analysis of The Tube Bank pressure drop of a Shell and tube heat exchanger using flat face header

Numerical analysis of The Tube Bank pressure drop of a Shell and tube heat exchanger using flat face header

The uniform distribution of flow in tube bundle of shell and tube heat exchangers is an assumption in conventional heat exchanger design as claimed by Bejan and Kraus (Bejan, found that increased turbulence levels lead to an enhancement in the heat transfer for tube banks with a few rows of plain circular tubes at small pitch to diameter ratios. Contrarily, the aim of the passive techniques is to alter the flow by changing the geometry of the arrangement. , 1991). Numericalanalysis of the tube bank pressure drop of a shell and tube heat exchanger (Kartk found that rough surfaces on the tubes of in-line flow have the potential to decrease the pressure drop while simultaneously improving heat transfer, at least within a particular range of Reynolds numbers, which is determined by the roughness parameter.
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Optimization of Fin and Tube Heat Exchanger

Optimization of Fin and Tube Heat Exchanger

Researchers have been studying to reduce the air-side thermal resistance of the fin and tube heat exchanger . There are two type of techniques that are used to increase the heat transfer rate. Passive techniques and Active techniques. In Passive techniques the changes are done in the structure, shape of the fin and tube used in fin and tube type heat exchanger. Fluid additives can also be added. In Active techniques surface vibrations analysis and pumping power analysis is done. In our research paper only passive techniques are analysed and investigated for increase the heat transfer rate of fin and tube type heat exchanger. By creating more turbulence the heat transfer rate can also increase. Generally the interrupted fins are used in fin and tube type heat exchanger to increase the convective heat transfer coefficient on the air-side of the heat exchanger.
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