Classification of heat exchangers according to different. From above three cases counter flow heat exchangers is most efficient among all these because it can transfer high amount of heat and it has higher temperature difference along its unit length. Any time a heat exchanger is being replaced, the opportunity should be taken to. Examples are water cooling towers and jet condensers in steam power plants. Heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. Selection, rating, and thermal design written by sadik kakac, hongtan liu and anchasa pramuanjaroenkij is very useful for mechanical engineering mech students and also who are all. Heat transfer heat exchanger types of heat exchangers. Heat transferheat exchangers wikibooks, open books for an. Heat exchangers log mean temperature difference lmtd. Shellandtube heat exchangers are the most widely used heat exchangers in process industries because of their. If a heat exchanger was built to the factory standard design, it carried a six digit number, the first three being the commodity code indicating the type of unit.
Revised and updated with new problem sets and examples, heat exchangers. Lewin heat exchanger design lecture objectives nbe familiar with the major types of available heat exchange equipment, with particular emphasis on shellandtube heat exchangers. The term heat exchanger applies to all equipment used to transfer heat between two streams. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. Different types and sizes of heat exchangers are used in steam power plants, chemical processing units, building heating and air conditioning, house hold. A practical guide for planning, selecting and designing of shell and tube exchangers takes users on a stepbystep guide to the design of heat exchangers in daily practice, showing how to determine the effective driving temperature difference for heat transfer. Heat exchanger and its types engineering solutions. A heat exchanger is a device built for efficient heat transfer from one medium to another. The information presented here along with the books referenced here is certainly a good start. It possesses large surface areas for heat transfer and is capable of operating at high temperatures and pressures. Aquahot heat exchangers are designed to work with aquahot hydronic heating systems, maximizing comfort and heating e. In industries, heat exchangers are used in industrial process to recover heat between two process fluids. 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.
Additionally, heat exchangers may be classified according to the type of fluid used liquidtoliquid. Chapter 5 heat exchangers faculty of engineering and. Mar 18, 2017 revised and updated with new problem sets and examples, heat exchangers. Likewise heat exchangers are used in almost every industry for heat transfer and heat recovery applications. Classifications of heat exchanger heat exchanger guide. Heat exchangers are classified according to transfer process number of fluids. Combustion air preheater, e2, heats the air using ip steam as well. Heat exchangers are mainly classified by their flow arrangements. Next, various methods for evaluating and comparing different types of heat transfer enhancement devices using ftrst. Reflecting the authors extensive practical experienc. A piece of equipment built for efficient heat transfer from one medium to another. 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.
Any time a heat exchanger is being replaced, the opportunity should be taken to reassess if the type used is best for the given process. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. The motivation for heat transfer enhancement is discussed, and the principles behind compact heat exchangers are summarized. 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. In addition socalled regenerative heat exchangers are used in some industries.
Types of heat exchangers the simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in figure 1, called the doublepipe heat exchanger. Compact heat exchangers widely used to achieve large heat rates per unit volume, particularly when one or both fluids is a gas. Types of heat exchangers the various types of heat exchangers are. Heat exchanger problem posted in process heat transfer. Comparison of heat exchanger types parallel heat exchanger. The different types of heat exchangers are classified in three main categories. Detailed process layout diagram and heat exchanger data are attached.
Heat exchanger background exchange heat between fluids latent heat and sensible heat transfer common to chemical process industry types of heat exchangers air cooled double pipe spiral plate and tube shell and tube need to provide context background for your work, but. The most popular abbreviation for heat exchanger is. Based on the matches made, the new heat exchanger network configuration is decided. The amount of heat transfer is equal to the maximum heat transfer thermodynamically possible. In this case, the two fluids enter the heat exchanger from the same end with a large temperature difference. Design of heat exchangers3 user needs of heat exchanger include types of fluids, quality of fluids fouled fluids, clean fluids,etc. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. If the heat exchangers were builttoorder, it carried an alphanumeric number called a. Objectives recognize what is heat exchanger differentiate numerous types of heat exchanger, their classification and their applications know the heat transfer equipment terminologies know the primary consideration in. Selection, rating, and thermal design, third edition presents a systematic treatment of the various types of heat exchangers, focusing on selection, thermalhydraulic design, and rating. If the heat exchangers were builttoorder, it carried an alphanumeric number called a qnumber. The efficiency of a counter flow heat exchanger is due to the fact that the average t difference in temperature. In counter flow heat exchangers, the two fluids flow in.
Next, various methods for evaluating and comparing different types of heat transfer enhancement devices using ftrst andor second law analysis are presented. Process heat group major challenges mit opencourseware. Shellandtube heat exchangers accounts for more than 50% of all heat exchangers installed. This comprehensive reference covers all the important aspects of heat exchangers hestheir design and modes of operationand practical, largescale applications in process, power, petroleum, transport, air conditioning, refrigeration, cryogenics, heat recovery, energy, and other industries. Additionally, heat exchangers may be classified according to the. Two examples of this are adiabatic wheels, which consist of a large wheel with fine threads rotating through the hot and cold fluids, and fluid heat. Quiet, comfortable heat cabin heaters komfort defroster part number exxd16200 for use whan ducting high volume is required. However, in many cases, there are more attractive alternatives in terms of cost and energy recovery. Combining each of these resistances in series gives.
One of the rules used to ensure that the best heat exchanger configuration is found is. When designing or choosing a heat exchanger there is no single correct solution. May 04, 2009 heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. The odd part i am trying to figure out with these two heat. A fourth type of heat exchanger uses an intermediate fluid or solid store to hold heat, which is then moved to the other side of the heat exchanger to be released. The course includes worked examples to reinforce the key learning as well as a demonstration of mechanical design and challenging problems encountered in the operation of heat exchangers. In in line exchangers, the hot and cold fluids move parallel to each other. Amine acid gas preheater, e1, heats the gas using ip steam. Pdf download sadik kakac, hongtan liu and anchasa pramuanjaroenkij by heat exchangers.
Review of literature on heat transfer enhancement in compact. Because of the number of variations in mechanical designs for front and rear heads and shells, and for commercial reasons,the tubular exchanger manufacturers associationtema has designated a system of notations that correspond to each major type of front head, shell style and rear head. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Review of literature on heat transfer enhancement in. Shell and tube heat exchangers are the most commonly used in the chemical processing industries today. Characterized by large heat transfer surface areas per unit volume, small flow passages, and laminar flow. Shell and tube heat exchangers are frequently selected for applications such as. The role of engineering designers is to convert the user needs into the heat exchanger outputs. Heat exchangers, cross flow, parallel flow, and counter flow. Tubetotubesheet joints of some types of shellandtube heat exchangers, such as fixed tubesheet hyydrotest and closed feedwater heaters in which the channel is welded to the shell, are visible only from the channel side with the shell side under pressure and the channel side at atmospheric pressure. You will be exposed to recent development and future trend in heat exchangers. Types and applications of heat exchangers types shellandtube heat exchangers air coolers plateframe exchangers compact platefin exchangers applications singlephase boilingevaporating condensation. Comparison of heat exchanger types china stainless steel. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and.
Lmtd is a good measure of the effectiveness of simlar heat exchangers of different designs often, lmtd counter flow lmtd parallel flow mit dept. Heat exchangers can be classified into four types, according to. Different types of heat exchangers can work equally well. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction. To choose a suitable heat exchanger for a certain application requires a level of knowledge and experience. The devices that are used to facilitate heat transfer between two or more fluids at different temperatures are known as heat exchangers. Heat exchangers a heat exchanger is a system designed to transfer heat between two fluids to control the temperature of one of the fluids. Fundamentals of heat exchanger performance energy balance. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Heat exchangers may be classified according to transfer process, construction, flow arrange ment, surface compactness, number of fluids and heat transfer mechanisms as shown in fig. Heat exchangers have widespread industrial and domestic applications. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 4 41. Comparison of heat exchanger types each of the three types of heat exchangers parallel, cross and counter flow has advantages and disadvantages.
Heat exchangers 73 individual thermal resistances of the system. Objectives recognize what is heat exchanger differentiate numerous types of heat exchanger, their classification and their applications know the heat transfer equipment terminologies know the primary consideration in the selection of heat exchangers. The heat pipe based heat exchanger applications were discussed by amir faghri 4 in his book. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. The fluid in the pipe which boils at one end and condenses at the other acts as the go.
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