Design and Numerical Simulation of Heat Transfer Rate of Triple Concentric Copper Tube Heat Exchanger (original) (raw)
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Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger
International Journal of Engineering and Advanced Technology
Triple concentric-tube exchanger (TCTHE) is an improved version of double concentric tube heat exchanger (DCTHE). Introducing an intermediate tube to a DCTHE provides TCTHE and enhances the heat transfer performance. Recognizing the need of experimental results, extremely scarce in the literature and essential to validate theoretical analyses, the aim of this work is to investigate thermal behavior of TCTHE. The present study includes design, development and experimental analysis of TCTHE for oil (ISO VG 22) cooling application required for industrial purposes. It comprises of water (cooling fluid) flowing through innermost tube as well as outer annulus and oil (hot fluid) flows through inner annulus. The experimental studies of the temperature distribution for three fluids along the length and heat transfer characteristics for TCTHE under insulated condition for counter current flow mode are carried out and discussed. The effect of change in oil (hot fluid) temperatures is analyzed...
The heat exchanger plays a crucial role in various industries, to decrease the energy consumption rate by increased heat transfer rate through heat exchanger. Heat exchanger increases the efficiency and performance of system. In industry, the tube in tube heat exchangers are used as condensers, vaporizers, sub-coolers, heat recovery exchangers, crystallizers etc. In this research work, to enhance the efficiency and performance of heat exchanger, a triple tube heat exchanger was modeled and numerical simulation has been done for the analysis of performance and efficiency. This triple tube heat exchanger is an updated and modified variant of conventional modified double tube heat exchanger. The triple tube heat exchanger is made up of three different diameters of tubes and all three tubes are arranged in concentric way. In this, cold or normal water flows in most outer and inner tube while hot water is flowing through a middle pipe. The triple tube heat exchanger was analyzed at various different mass flow rate and temperature of hot water. The model of triple tube heat exchanger was prepared and analyzed in Ansys Fluent and numerical simulation was also done and verified the results. In this type of heat exchanger maximum area of middle hot water flowing pipe is in contact with both inner and outer normal water flowing pipe, it provides maximum area for transfer of heat and gives maximum heat transfer rate and performance instead of double pipe heat exchanger. The results of both numerical and software simulation of triple tube heat exchanger shows the increased rate of heat transfer coefficient in compact size of heat exchanger. The triple tube heat exchanger gives better performance as compare to convention double tube heat exchanger.
Analysis of the heat transfer in double and triple concentric tube heat exchangers
IOP conference series, 2016
The tubular heat exchangers (shell and tube heat exchangers and concentric tube heat exchangers) represent an important category of equipment in the petroleum refineries and are used for heating, pre-heating, cooling, condensation and evaporation purposes. The paper presents results of analysis of the heat transfer to cool a petroleum product in two types of concentric tube heat exchangers: double and triple concentric tube heat exchangers. The cooling agent is water. The triple concentric tube heat exchanger is a modified constructive version of double concentric tube heat exchanger by adding an intermediate tube. This intermediate tube improves the heat transfer by increasing the heat area per unit length. The analysis of the heat transfer is made using experimental data obtained during the tests in a double and triple concentric tube heat exchanger. The flow rates of fluids, inlet and outlet temperatures of water and petroleum product are used in determining the performance of both heat exchangers. Principally, for both apparatus are calculated the overall heat transfer coefficients and the heat exchange surfaces. The presented results shows that triple concentric tube heat exchangers provide better heat transfer efficiencies compared to the double concentric tube heat exchangers.
Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger 3901
2019
Triple concentric-tube exchanger (TCTHE) is an improved version of double concentric tube heat exchanger (DCTHE). Introducing an intermediate tube to a DCTHE provides TCTHE and enhances the heat transfer performance. Recognizing the need of experimental results, extremely scarce in the literature and essential to validate theoretical analyses, the aim of this work is to investigate thermal behavior of TCTHE. The present study includes design, development and experimental analysis of TCTHE for oil (ISO VG 22) cooling application required for industrial purposes. It comprises of water (cooling fluid) flowing through innermost tube as well as outer annulus and oil (hot fluid) flows through inner annulus. The experimental studies of the temperature distribution for three fluids along the length and heat transfer characteristics for TCTHE under insulated condition for counter current flow mode are carried out and discussed. The effect of change in oil (hot fluid) temperatures is analyzed...
Study on effectiveness of heat pipe heat exchanger with copper tube cylinders
Materials Today: Proceedings, 2020
Heat pipe is a devise which uses sensible heat to transfer heat from one end of tube to the other end. Heat pipe heat exchanger is one of the advanced techniques in storing and releasing of energy. Copper was used as a tube material and Demineralized-water as the working fluid. The heat pipe utilizes the latent heat of the vaporized working fluid instead of the sensible heat. The heat pipe heat exchanger is one of the attractive devices used in waste heat recovery because of its high effectiveness in heat transfer and other special features. Heat pipe heat exchangers have been used in many ways, in boilers, furnaces and dryers, especially for energy recovery in steel industry. The results reveal decrease in transfer of heat with the increase in mass flow rate. The better effectiveness is observed for fixed cold water flow rate. The heat pipe heat exchanger was found to be an effective method to replace conventional heat exchanger with better effectiveness and compactness. The increa...
Analysis of Heat Exchanger through Different Materials Tubes
Double pipe heat exchanger is simplest type's concentric pipes of different diameter. In this paper parallel and counter both flow arrangements will do. Selecting different materials copper, aluminum and steel for heat exchangers and producing tubes of heat exchangers have been studied and the discus effects of thermal conductivity on them. Operations on the different tubes with different materials are having the same dimensions (diameter and length) and the factors affecting heat exchangers. Further, selection of the most appropriate tube material and obtained with regard results to these factors. By analysis and experimentation of systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward counter flow configuration compared to all other factors, except these we observe to vary with small difference in each section. Comparing of these three tube heat exchangers, effectiveness is more for copper tube heat exchanger ie., it can carry out more heat from inner hot fluid to outer cold fluid. The correlations of Nusselt number, Reynolds number and Prandtl number will be determined through multivariate linear normal regression.
Experimental Analysis of Triple Tube Heat Exchanger
In this research work, experimental setup has made for the study carried out for triple tube heat exchanger. Triple tube heat exchanger experiment performed for the N-H-N and C-H-C configuration for the study purpose. In N-H-N, normal temperature water passes from the inner tube and outer annulus and hot water from the inner annulus. In C-H-C, cold temperature water passes from the inner tube and outer annulus and hot water from the inner annulus. The decrease in hot water temperature in both the cases is given in this work.
Analytical and Numerical Design Analysis of Concentric Tube Heat Exchangers – A Review
IOP Conference Series: Materials Science and Engineering
This paper considers an analytical and a numerical approach in the design of a concentric tube heat exchanger. Sensible heat transfer is considered in the analysis and the heat exchanger is developed for actual operating conditions in a chemical plant. The heat exchanger is a concentric tube heat exchanger where hot oil exchanges heat with hot water. Hot oil is in the inner pipe and the heating medium, hot water, is in the outer pipe (annular side) of the heat exchanger. An analytical model employing effectiveness-number of transfer units (ɛ-NTU) approach and log mean temperature difference (LMTD) approach were employed in the design of the concentric tube heat exchanger. In the design process, performance charts were developed for concentric tube heat exchanger. Performance charts describe the performance of the heat exchanger in terms of crucial dimensionless parameters. Performance charts help to select the right number of transfer units (NTU) for the given heat exchanger. Both parallel and counter flow configurations were considered for the design analysis. Likewise, a numerical model was also considered in the design of the heat exchanger. The results from the analysis are presented and compared. From the results it can be seen that both numerical and analytical approaches produce the exact same results. The designer certainly has the flexibility to choose an appropriate design methodology based on the available inputs and requirements.
CONSTRUCTION AND ANALYSIS OF TUBE IN TUBE TYPE HEAT EXCHANGER
This paper is concerned about the study of heat transfer of hot water with different types of cooling fluids used in horizontal tube in tube type Heat Exchanger of 1.6m length. Aim of this study is to compare and plot results for parallel and counter flow in Heat exchanger for different cooling fluids. Cooling fluid used in this experiment for taking readings is water. Water as a coolant play an important role in many industry sectors including power generation, chemical production, airconditioning , transportation and microelectronics. Also this experiment will give heat transfer rates for different flow rate of hot water and cooling fluid.