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. We here focus on the thermal analysis of heat exchangers, but proper design and use requires additional fluid. Abstract diverse sorts of heat exchangers are broadly utilized as a part of many design applications, for example, petroleum refining, refrigeration, cooling, nourishment industry, and so forth. The compact heat exchangers types that heatric manufactures are printed circuit heat exchangers pches, formed plate heat exchangers fphes, and hybrid heat exchangers h 2xs.
When the heat exchanger is under running or pressurizing, never unscrew any of the tightening bolts. Ppt heat exchangers powerpoint presentation id1755346. Thistype of heat exchanger need a large area of heat transfer therefore it is rarely used in practice. Will save you an incredible amount of calculation work. Selection, rating, and thermal design for gathering into one place the essence of the information they needinformation formerly scattered throughout the. Types of heat exchangers industrial heat exchanger. Typ es heat exchangers are offtheshelf equipment targeted to the efficient transfer of heat from a hot fluid flow to a cold fluid flow, in most cases through an intermediate metallic wall and without moving parts. Performance analysis of shell and tube heat exchangers scribd. The engineer may have little knowledge of the attributes of these other types so is not able to make a reasonable selection. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. In most cases the plate type is the most efficient heat exchanger. These are simple to construct, but may require a lot of physical space to achieve the desired heat transfer area. Heat exchangers jordan university of science and technology. A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids.
Common heat exchanger applications, including steam preheaters and condensors. Heat transfer heat exchanger types of heat exchangers. Pdf selection of heat exchanger types gerard hawkins. The present book concerns plate heat exchangers phes, which are one of the most common types in practice. Warranty and service contact information is also included. The efficiency of a counter flow heat exchanger is due to the fact that the. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. Furthermore, dont touch it until complete cooldown to the normal temperature after the shutdown. Lewin heat exchanger design lecture objectives nbe familiar with the major types of available heat exchange equipment, with particular emphasis on shellandtube heat exchangers. Heat transfer by shell and tube heat exchangers scribd. It is called a doublepipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first. The two streams enter at one end and leave at the other end. The common applications of compact heat exchangers the factors to be taken into account when designing, selecting and operating compact heat exchangers the potential market for compact heat exchangers in the uk has grown significantly, helped by the continuing development of new types.
Compact heat exchangers used when a large heat transfer surface area per unit volume is desired and at least one of the fluids is a gas heat transfer correlated in terms of the colburn j factor jh st prm and the reynolds number, where both the stanton st hgcp and reynolds re gdhu numbers are based on the maximum mass velocity types. Aa, bg, c, d, hp, hr, lc, and tv series heat exchangers. The motivation for heat transfer enhancement is discussed, and the. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between. They made it clear that the heat transfer rate of the spiral heat exchanger is more than that of the other types of heat exchangers 6. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another hot and cold fluid. Heat exchangers are devices used throughout industry for both heating and cooling processes.
Due to the custom nature of all xchanger heat exchangers, this manual discusses the characteristics and procedures that are common to all exchangers. Review of literature on heat transfer enhancement in. Unesco eolss sample chapters thermal power plants vol. Abstract diverse sorts of heat exchangers are broadly utilized as a part of many design applications, for example, petroleum refining, refrigeration, cooling, nourishment industry, and so. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. The overall objectives are to present comprehensive descriptions of such heat exchangers and their advantages and limitations, to provide indepth thermal and hydraulic design theory for phes, and to present stateoftheart knowledge. The use of compact heat exchangers can offer a number of. Next, various methods for evaluating and comparing different types of heat transfer enhancement devices using ftrst andor second law analysis are presented.
A unique, singlesource volume offering essential material on heat exchanger design in a unified approach suitable to many applications, fundamentals of heat exchanger design details an indepth thermal and hydraulic design theory underlying twofluid heat exchangers for steadystate operation. Review of literature on heat transfer enhancement in compact. District heating systems can benefit from plate heat exchangers or gasket plate heat exchangers, allowing individual houses to use the correct amount of hot water from a centralised source. Examples of common tema type heat exchangers straight tube, fixed tubesheet eg. The calculators are quite sophisticated and, although they have been made user friendly, require sufficient knowledge of heat exchangers. Depending on the type of heat exchanger employed, the heat transferring. Many types of heat exchangers have been developed for use in steam power plants, chemical processing plants, building heat and air conditioning systems. The general principles of the mechanical design of the following types of exchangers are given in the heat exchanger design handbook 1994, and full descriptions of each, are given under the corresponding entries in this encyclopedia. These are all formed from alternating layers typically hotcold, hotcold etc. Tema has established a set of construction standards for shell and tube heat exchangers. Beside the questions of thermodynamic basics, the book addresses several important issues, such as conceptions, design, operations, fouling and cleaning of heat exchangers. 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. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction. Specifying plateandframe heat exchangers engineers often fail to realize the differences between heat transfer technologies when preparing a speci.
Fouling vibration in tubes lower heat transfer coefficient solution the most common change is a reduction in the heat transfer rate due to fouling of the surfaces. Thermal rating for a shell and tube heat exchanger. Shellandtube exchanger 1 shellandtube exchangers provide large amounts of heat transfer areaup to 5000 ft 2 in relatively small space available in standard sizesspecified by tema of shell diameters and tube counts number of tubes per shell depends on shell diameter, tube diameter. Shellandtube heat exchangers are the most widely used heat exchangers in process industries because of their. Often overlooked, jigs and fixtures are types of manufacturing aids used to produce products and are essential for delivering those products reliably, repeatedly and with high. 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. This article focuses on heat exchangers, exploring the various designs and. Heat exchangers have widespread industrial and domestic applications.
When heat exchanger handles steam and other fluid of high temperature, it has hazard of burns. 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. Although the majority of heat exchangers used on chemical plant are shell and tube units, there are many other types available. Heat exchangers heat transfer heat exchanger scribd. Iii aircooled heat exchangers and cooling towers d. The tubular exchanger manufacturers association tema is an association of manufacturers of shell and tube heat exchangers. Indirect heat exchangers are available in several main types plate, shelland tube, spiral etc. Heat exchanger is a device for transferring heat from one medium to another. Jul 01, 2016 according to flow of fluids, the heat exchangers are classified into three categories.
In this case, the two fluids enter the heat exchanger from the same end with a large temperature difference. 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. Combining each of these resistances in series gives. This calculator is based on equation 3 and can be used to calculate the heat radiation from a warm object to colder surroundings. Note that the input temperatures are in degrees celsius. Plate heat exchangers can also be used to cool oils using water, where the two liquids cant mix. Performance analysis of shell and tube heat exchangers. Heat transfer by shell and tube heat exchangers tema designations of heat exchangers permits the use of one half of the shell at a time. Pratap vanka abstract this paper features a broad discussion on the application of enhanced heat transfer surfaces to compact heat exchangers.
Engineering page heat exchangers, thermal calculators. Pdf effect of different types of baffles on heat transfer. Understanding heat exchangers types, designs, applications. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. Heat exchangers 73 individual thermal resistances of the system.
Type of heat exchangers free download as powerpoint presentation. A removable bonnet or cover plate design is provided to facilitate tube cleaning. Types of heat exchangers and their applications ppt. In industries, heat exchangers are used in industrial process to recover heat between two process fluids. For heat exchangers, different types of rolled as well as extruded aluminium products are used. Cross flow parallel flow heat exchanger the two fluid streams travel in the same direction. Heat loss from a heated surface to unheated surroundings with mean radiant temperatures are indicated in the chart below. Online calculators to perform iterative thermal rating calculations for shell and tube heat exchangers. Each of the three types of heat exchangers has advantages and disadvantages. Scribd is the worlds largest social reading and publishing site. Type bem, aem, nen tubesheet is welded to the shell and the heads are bolted to the tubesheet. Performance analysis of shell and tube heat exchangers free download as pdf file. As shown in figure 1, a sphe consists of two sheets that were rolled around a central rod and therefore two separated concentric channels are made. The heat exchanger design handbook hedh is the standard reference source for design and other information on heat transfer, heat exchangers, and associated technologies.
It is a device that is used to transfer thermal energy from one body or fluid stream to another. Cooling towers the development, practice, and performance of evaporative cooling systems or cooling towers have been described in numerous publications including some of those listed in the bibliography. Heat exchangers are classified into three categories 1. Review of literature on heat transfer enhancement in compact heat exchangers written by kevin stone under supervision of prof. Within this type of heat exchanger, several layers of tubes are helically wound around a large centre tube, known as a mandrel. Chapter 11 heat exchangers objectives when you finish studying this chapter, you should be able to. An and choi et al developed procedure for the detailed phenomena in shell and tube heat exchangers to predict the heat and mass transfer characteristics of shell and tube heat exchangers. Some of the types of shell and tube heat exchangers available include helical coil heat exchangers and double pipe heat exchangers, and some of the applications include preheating, oil cooling, and steam generation. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 4 41. Many types of heat exchangers have been developed for use in steam power plants, chemical processing plants, building heat and air conditioning systems, transportation power systems, and. Understanding heat exchangers types, designs, applications and.
Several variants of heat exchangers are available and find application in a wide range of industries, including. Currently, hedh contains more than 6,000 pages of technical information compiled and edited by the worlds foremost specialists and is presented in five parts. Table 1, below, indicates some of the common industries and applications of the types of heat exchangers previously mentioned. In heat recovery applications, or where the application calls for increased thermal length to acheive effective overall heat transfer, shells can be installed with the flows in series.