Ppt heat exchangers powerpoint presentation id1755346. 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. The use of compact heat exchangers can offer a number of. The present book concerns plate heat exchangers phes, which are one of the most common types in practice. 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. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between. Heat transfer heat exchanger types of heat exchangers. Online calculators to perform iterative thermal rating calculations for shell and tube heat exchangers. 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.
We here focus on the thermal analysis of heat exchangers, but proper design and use requires additional fluid. 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. This calculator is based on equation 3 and can be used to calculate the heat radiation from a warm object to colder surroundings. Review of literature on heat transfer enhancement in compact. The tubular exchanger manufacturers association tema is an association of manufacturers of shell and tube heat exchangers. Heat exchangers heat transfer heat exchanger scribd. Heat exchangers 73 individual thermal resistances of the system.
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. Table 1, below, indicates some of the common industries and applications of the types of heat exchangers previously mentioned. In industries, heat exchangers are used in industrial process to recover heat between two process fluids. Review of literature on heat transfer enhancement in. Will save you an incredible amount of calculation work. The calculators are quite sophisticated and, although they have been made user friendly, require sufficient knowledge of heat exchangers. The engineer may have little knowledge of the attributes of these other types so is not able to make a reasonable selection. Heat exchangers are devices used throughout industry for both heating and cooling processes. 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. Pdf selection of heat exchanger types gerard hawkins.
But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. Types of heat exchangers and their applications ppt. Selection, rating, and thermal design for gathering into one place the essence of the information they needinformation formerly scattered throughout the. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. Cross flow parallel flow heat exchanger the two fluid streams travel in the same direction. Shellandtube heat exchangers are the most widely used heat exchangers in process industries because of their. Lewin heat exchanger design lecture objectives nbe familiar with the major types of available heat exchange equipment, with particular emphasis on shellandtube heat exchangers.
Iii aircooled heat exchangers and cooling towers d. Due to the custom nature of all xchanger heat exchangers, this manual discusses the characteristics and procedures that are common to all exchangers. Understanding heat exchangers types, designs, applications and. Many types of heat exchangers have been developed for use in steam power plants, chemical processing plants, building heat and air conditioning systems. 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 doublepipe heat exchanger is one of the simplest types of heat exchangers. 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. 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. 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.
Note that the input temperatures are in degrees celsius. 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. Review of literature on heat transfer enhancement in compact heat exchangers written by kevin stone under supervision of prof. Performance analysis of shell and tube heat exchangers free download as pdf file. 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. 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. Chapter 11 heat exchangers objectives when you finish studying this chapter, you should be able to. The heat exchanger design handbook hedh is the standard reference source for design and other information on heat transfer, heat exchangers, and associated technologies. The two streams enter at one end and leave at the other end. Performance analysis of shell and tube heat exchangers scribd. The motivation for heat transfer enhancement is discussed, and the. When the heat exchanger is under running or pressurizing, never unscrew any of the tightening bolts. Common heat exchanger applications, including steam preheaters and condensors. Thermal rating for a shell and tube heat exchanger.
For heat exchangers, different types of rolled as well as extruded aluminium products are used. 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. 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. 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 compact heat exchangers types that heatric manufactures are printed circuit heat exchangers pches, formed plate heat exchangers fphes, and hybrid heat exchangers h 2xs. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Examples of common tema type heat exchangers straight tube, fixed tubesheet eg. Several variants of heat exchangers are available and find application in a wide range of industries, including. Heat exchangers have widespread industrial and domestic applications. Furthermore, dont touch it until complete cooldown to the normal temperature after the shutdown. Unesco eolss sample chapters thermal power plants vol. 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. Combining each of these resistances in series gives. A removable bonnet or cover plate design is provided to facilitate tube cleaning.
Kroger encyclopedia of life support systems eolss 2. Understanding heat exchangers types, designs, applications. When heat exchanger handles steam and other fluid of high temperature, it has hazard of burns. Aa, bg, c, d, hp, hr, lc, and tv series heat exchangers. Plate heat exchangers can also be used to cool oils using water, where the two liquids cant mix. Warranty and service contact information is also included. The simplest type of heat exchanger is an open feed water heater. Within this type of heat exchanger, several layers of tubes are helically wound around a large centre tube, known as a mandrel. These are simple to construct, but may require a lot of physical space to achieve the desired heat transfer area. The efficiency of a counter flow heat exchanger is due to the fact that the. 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. 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.
Heat exchangers jordan university of science and technology. Specifying plateandframe heat exchangers engineers often fail to realize the differences between heat transfer technologies when preparing a speci. Beside the questions of thermodynamic basics, the book addresses several important issues, such as conceptions, design, operations, fouling and cleaning of heat exchangers. 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. The motivation for heat transfer enhancement is discussed, and the principles behind compact heat exchangers are summarized. 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. 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.
Air cooled heat exchangers dominate the plots of refineries, petrochemical complexes, natural gas processing facilities and power plants, so consider this. A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. 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. Among different types of heat exchangers th at are used for cooling and heating the fluids in industries, spiral plate heat exchanger sphe has an especial place. Heat exchanger is a device for transferring heat from one medium to another. 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. These are simple to construct, but may require a lot of.
Performance analysis of shell and tube heat exchangers. Although the majority of heat exchangers used on chemical plant are shell and tube units, there are many other types available. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction. It is a device that is used to transfer thermal energy from one body or fluid stream to another. 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. Pdf effect of different types of baffles on heat transfer. These are all formed from alternating layers typically hotcold, hotcold etc. Heat loss from a heated surface to unheated surroundings with mean radiant temperatures are indicated in the chart below. 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. 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. Thistype of heat exchanger need a large area of heat transfer therefore it is rarely used in practice. Tema has established a set of construction standards for shell and tube heat exchangers. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids.
This article focuses on heat exchangers, exploring the various designs and. Heat transfer by shell and tube heat exchangers scribd. In this case, the two fluids enter the heat exchanger from the same end with a large temperature difference. In most cases the plate type is the most efficient heat exchanger. Each of the three types of heat exchangers has advantages and disadvantages. Engineering page heat exchangers, thermal calculators. Next, various methods for evaluating and comparing different types of heat transfer enhancement devices using ftrst andor second law analysis are presented. Indirect heat exchangers are available in several main types plate, shelland tube, spiral etc.
John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 4 41. Heat exchangers are classified into three categories 1. 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. Pratap vanka abstract this paper features a broad discussion on the application of enhanced heat transfer surfaces to compact heat exchangers.