To heat a cooler fluid by means of a hotter fluid 2. A heat exchanger is a device in which energy is transferred from one fluid to another across a solid surface. Computational fluid dynamics in heat exchanger design and. The second type is regenerative type, in which hot and cold fluids are in the same space which contain a matrix of materials which work alternately as source for heat flow. Pdhonline course m371 2 pdh shell and tube heat exchangers. Shell and tube heat exchanger is one such heat exchanger, provides more area for heat transfer between two fluids in comparison with other. The heat recovery from hot fluid is used to increase the temperature of cold. Results show that, maximum heat flux of the nanofluid is about 46 % higher than that of water. Deionized water and cuowater nanofluid were used as working fluids in the thermosyphon. Shell and tube heat exchanger provide relatively large ratio of heat transfer area to volume and weight and they can be easily cleaned. Heat exchange involve convection in each fluid and. A cfdbased analysis on trends of heat exchanger fouling. Cfd analysis of heat transfer in a helical coil heat exchanger using fluent a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in mechanical engineering by soumya ranjan mohanty 109me0388 under the guidance of dr.
Heat exchangers a heat exchanger is a system designed to transfer heat between two fluids to control the temperature of one of the fluids. The optimum thermal design of a shell and tube heat exchanger involves the consideration of. Jul 08, 2016 ppt on failure analysis of shell and tube heat exchangers 1. The term heat exchanger applies to all equipment used to transfer heat between two streams. Counterflow heat exchangers have an even temperature difference across the heat transfer length. Jul 08, 2016 report on failure analysis of shell and tube heat exchangers 1. Heat exchanger problem calculation lmtd and effectiveness. Numerical and heat transfer analysis of shell and tube. In the analysis of heat exchangers, it is often convenient to work with an overall heat transfer coefficient, known as a ufactor. Counter flow heat exchangers are the most efficient of the three types. In this article the mathematical model of the heat exchanger is defined, which is subsequently applied to the plate heat exchanger, which is connected in series with the other heat exchanger tubular heat exchanger. Pdf cfd analysis of heat transfer enhancement in shell.
Jul 01, 2016 heat can flow only from hotter to cooler fluids, as per the second law of thermodynamics. Shell and tube heat exchanger offer great flexibility to meet almost any service requirement. Heat exchanger is the equipment which is used to reduce temperature of one process fluid, which is desired to cool, by transferring heat to another fluid which is desired to heat with or without intermixing the fluid or changing the physical state of the fluid. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid. From a practical point of view it lack many characteristics, for example a good treatment of exchanger construction and the general problem of the design in itself. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Shell and tube heat exchangers basic calculations pdh online. Confirm complex heat exchanger performance bryan research. Pdf cfd analysis of heat exchanger over a staggered tube. Simulation results are generally found within 2%10% of experimental outcomes. Heat exchanger analysis heat exchanger calculation. The process fluid was analysed to obtain its physical properties, and, using a flow simulation software package with the cad software, the behaviour of the fluid in the heat exchanger was calculated.
Consider an infinitesimal part of the heat exchanging tube of area da, where temperatures of hot and cold fluid are th and tc, respectively. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a. The two most common heat exchanger design problems are those of rating and sizing. Combining each of these resistances in series gives. Exchanger analysis and design therefore involve both convection and conduction. Also by increasing the nanofluid concentration, the wall. A heat exchanger could remove thermal energy from a fluid used in an airconditioning system or add thermal energy to a system where processes require a certain temperature to work properly.
The study showed that energy can be tapped from engine exhaust. If the heat exchanger is located at the inlet or discharge of a blower with a pulsating flow, such as a roots type rotary lobe blower, the heat exchanger must be protected from the pulsation by a chambered silencer. Due to the high heat transport capacity, heat exchanger with heat pipes has become much smaller than traditional heat exchangers in handling high heat fluxes. Temperature pathlines by static temperature from the that we had obtained we can analyze that the design of double pipe heat exchanger had reached a great sucesss. The step by step procedure for determination of overall heat transfer coefficient are described below. These rules can save you hours and hours of stages of analysis and design. First, the heat exchanger with its inlet header was redesigned using 3d cad software. If it is too high, revise the heat exchanger configuration until the pressure drop is acceptable. College of engineering pune introduction of heat exchangers 3. The heating is to be accomplished by passing hot engine oil, which is at 160c, through the shell side of the exchanger. Heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids. The improvement in overall heat transfer coefficient, nanofluid heat transfer coefficient and efficiency of plate heat exchanger obtained from the simulations were 23%, 30% and 12%, respectively.
Numerical analysis of tubefin heat exchanger using fluent. Regenerative heat exchangers improve system efficiency by returning energy to the system. Asme section iii stress analysis of a heat exchanger. The present work report, the analysis of pressure drop and heat transfer characteristics over a staggered tube bank heat exchanger with different tube bundle arrangements by using fluent software. Roberto ruiz ensa engineering department avda juan carlos i, 8, 39600. The heat transfer rate for a heat exchanger can be calculated using the equation below. The ufactor is defined by an expression analogous to newtons law of cooling. These are being effectively used for analysis of all heat exchanger problems. Chapter 5 heat exchangers faculty of engineering and. As its name implies, this type of heat exchanger consists of a shell a large vessel. From the baffle arrangement flow analysis results the 35o inclinations of baffle gives good heat transfer rate comparing other inclination angles. Make a more detailed estimate of the overall heat transfer coefficient, u, based on the preliminary heat exchanger configuration. The figure below shows the temperature profile along the direction of flow in parallel. Cfd has become an integral part of design process, eliminating need of prototyping.
A nonregenerative heat exchanger rejects heat to the surroundings. Air cooled heat exchanger it is tubular heat transfer equipment in which ambient air passes over the tubes and thus acts as the cooling medium. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid. Inlet and outlet boundary conditions for the analysis of shell and tube heat exchanger inlet and outlet conditions for hot fluid the hot water is entered at a temperature of 348 k, and different mass flow rates such as 0. Cfd analysis of heat transfer in a helical coil heat exchanger using fluent a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in. Heat exchangers can be classified into four types, according to. The results obtained from the analysis are given below, fig. The analysis carried out for making it inclined to the flow of hot fluid in the way of 5o,10 o,15 o,20 o,25 o, 30o and 35 o. Heat exchanger failure analysis of heat exchanger page. Cfd applications in various heat exchangers design. Ppt on failure analysis of shell and tube heat exchangers 1. For analysis boiler is divided in three sub region.
May 18, 2018 the flow in the heat exchanger is considered under steadystate and fully insulated at the outer surface. The first type of a heat exchanger is called the recuperative type, in which heat are exchanged on either side of a dividing wall by fluids. Pdf computational fluid dynamics analysis of shell and. A plate heat exchanger, phe, is a compact heat exchanger where thin corrugated plates some 0. Ppt on failure analysis of shell and tube heat exchangers. Heat exchangers 73 individual thermal resistances of the system. Seebeck effect, thermoelectric generator, heat exchanger, thermoelectric materials and. Enrique gomez ensa engineering department avda juan carlos i, 8, 39600 maliano, cantabria, spain tel. Model of double pipe heat exchanger the analysis was done in ansys fluent. Computational fluid dynamics analysis of shell and tube heat exchanger article pdf available november 2014 with 6,864 reads how we measure reads. The image above gives a representation of the fluid flow. Examples are water cooling towers and jet condensers in. The book is suggested for academics or to develop a theoretical analysis of heat exchanger design.
Numerical analysis of tubefin heat exchanger using fluent m. The flow in the heat exchanger is considered under steadystate and fully insulated at the outer surface. Balanced counter flow heat exchanger assuming and cc, then the lmtd becomes undefined as. Simulation and cfd analysis of heat pipe heat exchanger. Cfd analysis of the plate heat exchanger mathematical. Air is available in unlimited quantities compared to water. The oil provides an average convection coefficient ho 400 wm2k on the outside of the tubes. A sthe is the most common type of heat exchanger in oil re fineries and other large chemical processes, and is suited for higherpressure applications. For the heat transfer to occur two fluids must be at different temperatures and they must come thermal contact. Application of numerical simulations based on the cfd calculation when the mass and heat transfer between the fluid flows is essential component of thermal calculation. Heat leaves the warmer body or the hottest fluid, as long as there is a temperature difference, and will be transferred to the cold medium. Request pdf a cfdbased analysis on trends of heat exchanger fouling with the use of finite volume method, this study focuses on the twoequation kepsil turbulence model with enhanced wall. Highlights commercial cfd softwares are reducing the need of special purpose cfd codes.
Failure analysis of shell and tube heat exchangers raj kulsange mis no121524006 under guidance of. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. Thermal analysis of double pipe heat exchanger by changing. Types of heat exchangers the three main types of heat exchangers are, 1. Kirar patel college of science and technology, rajiv gandhi proudyogiki vishwavidhyalaya, ratibad, bhopal 462036, india email. Design and analysis of heat exchanger for automotive. Shell and tube heat exchanger can be designed for high pressure relative to the. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact. Estimate the pressure drop across the heat exchanger. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. A computational fluid dynamics model for simulation of a thermosyphon with twophase flow including phase change heat transfer was developed. Heat exchangers are commonly used in industry, and proper design of a heat exchanger depends on many variables.
John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 6 41 the cross. Asme section iii stress analysis of a heat exchanger tubesheet with a misdrilled hole and irregular or thin ligaments dr. Pdf cfd analysis of heat transfer and fluid flow in. Space radiator a heat exchanger that transfers heat from the hot fluid to the surrounding space by radiation. This is to certify that the project report on design and analysis of heat exchanger is the bona fide work of akash behl and yash rane, students from indian institute of technology roorkee, who carried out the project work under my supervision during the summer internship 2012. The aim of the study is design tube and box heat exchanger with various pattern of tubes and examine the flow and temperature field at inlet and outlet point of tube and container using ansys programming tool. A heat exchanger is a component that allows the transfer of heat from one fluid liquid or gas to another fluid. The inner pipe is a suction pipe of the pump in which hot hydrocarbon flows and in outer annulus cold crude oil passes from opposite direction. A shellandtube heat exchanger must be designed to heat 2. Shell and tube heat exchangers are having special importance in boilers, oil coolers, condensers, preheaters. Exergy loss or irreversibility in regioni air and fuel enters this sub region at atmospheric condition.
Plate type heat exchanger this is constructed by a series of corrugated parallel plates held firmly together between frames. Very hightemperature gascooled reactor vhtr is a proposed generation iv geniv nuclear reactors by the generation iv forum. Collection and analysis of commoncause failures of heat. Density and viscosity can be determined by analysis. The heat recovery from hot fluid is used to increase the temperature of cold fluid. A heat exchanger is a heat management system that uses fluids to transfer heat from one medium to the other. Heat exchanger design handbook, second edition, 20, 1260. The model prepared in the solid works was simplified in to symmetric fluid sections in the design modeler for the easy computation of analysis. To reduce the temperature of a hot fluid by means of a cooler fluid 3. In this study the results were obtained by both numerical simulations and experimental data. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to. To develop the methodology for heat exchanger analysis and design, we look at the problem of heat transfer from a fluid inside a tube to another fluid outside. Consider an infinitesimal part of the heat exchanging tube of area da, where temperatures of hot and cold fluid are t h and t c, respectively.
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