This document has been reproduced directly from the best available copy. Heat transfer, or heat, is energy in transition between communicating systems due to a temperature difference. Heat exchangers jordan university of science and technology. A finned tube heat exchanger, air cooled heat exchanger ache, cooler or dryer works by flowing a liquid into a series of tubes, whilst pumping gas or air around or over the pipework to cool the fluid down. Almost all the systems onboard ship depends on heat exchanger where the fluid is either cooled or heated. A closeup view of a section of a watertoair heat exchanger. A heat exchanger is a device that is used to transfer thermal energy enthalpy. In this type of exchangers the tube sheet is welded to the shell and no relative movement between the shell and tube bundle is possible figure 1. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. Shell and tube exchangers have several different configurations with different types of heads and shells. Two types of convection are natural convection and forced convection. Heat exchangers are devices designed to transfer heat between two or more fluidsi.
Singleembossed pillow plates are formed when the base plate is significantly thicker than the top plate. The most important difference between these four basic types lies in. Simplified heat exchanger design calculations2 if inlet and outlet temperatures and one mass flow rate are known 1. Selection of heat exchanger types linkedin slideshare.
A temperature difference too low avoids the heat to flow. The types of exchangers are mainly defined by their construction and are as follows. A plate heat exchanger is a compact type of heat exchanger that uses a series of thin plates to transfer heat between two fluids. This is composed of multiple, thin, slightlyseparated plates that have very large surface areas and fluid flow passages for heat transfer. Heat transfer by convection between a surface and the fluid surrounding can be increased by attaching to the surface called fins. This type of heat exchanger, also referred to as a surface heat exchanger, can be further classi. Types of cooling fins fin efficiency, applications. All these heat exchangers can be operated in both parallel and. Convection describes heat transfer between a surface and a liquid or gas in motion. A plate type heat exchanger, as illustrated in figure 2, consists of plates instead of tubes to separate the hot and cold fluids. Plate heat exchanger another type of heat exchanger is the plate heat exchanger. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another. Types of heat exchangers and their applications ppt. Types of heat exchangers industrial heat exchanger.
The hot and cold fluids alternate between each of the plates. It means that it is impossible to heat a fluid up to exactly the same temperature as the heating fluid. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. The temperature measurements are read on electrical control panel display. Actually, this step is going to determine physical properties and shape of the heat exchanger. Heat exchanger and its types engineering solutions. Unit converter containing 23 measurements with 200unit conversion. These standards define the style of heat exchanger and the machining and assembly tolerances. Different types of shell and tube designs are possible. A heat exchanger is a system used to transfer heat between two or more fluids. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. In commercial aircraft heat exchangers are used to take heat from the engines oil system to heat cold fuel. Find out ntu from the ntu relationships for different types of heat exchangers 4.
As the fluid or gas travels faster, the convective heat transfer increases. Double pipe heat exchanger simplest heat exchanger. The basic principle of its use is to transfer heat, whether in liquid or gas form, through a series of conductive channels. A piece of equipment built for efficient heat transfer from one medium to another. Plate heat exchangers also differ in the types of plates that are used, and in the configurations of those plates. This stacked plate arrangement can be more effective, in a given space, than the shell and tube heat exchanger. 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 a heat exchanger is a heat transfer device that exchanges heat. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Due to the different types of applications for heat exchanges, different types of hardware and different configurations of heat exchanges are required.
John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 4 41. The type of heat exchanger used for a particular usage depends on the application and requirement. Fins surfaces analyzed in the current paper, for heat exchanger airwater are rectangular. The tubes can also be straight, with one or two passes. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Heat exchangers have widespread industrial and domestic applications. The two most common heat exchanger design problems are those of rating and sizing. Calculate q and the remaining mass flow rate using energy conservation 2. Gbhepeghea506 selection of heat exchanger types information contained in this publication or as otherwise supplied to users is believed to be accurate and correct at time of going to press, and is given in good faith, but it is for the user to satisfy itself of the suitability of the information for its. Oct 11, 2019 different types of heat exchangers are used onboard a ship. Heat travels always from a hot body to a cold body.
Types of heat exchangers used on ship marine insight. Heat exchangers are devices used to transfer heat energy from one fluid to. 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 shell and tube heat exchanger in the photo above has about twelve times the efficiency than a hypothetical singletube heat exchanger of the same size. Introduction to heat exchangers bengt sunden lund institute of technology. There are many different applications that are covered by each type of heat exchanger, but in. Pdf heat exchanger types and classifications researchgate. Experimental analysis of performance of heat exchanger. Oct 23, 2019 phex is an easy to use tool which demonstrates the thermal calculations of gasketed plate heat exchangers, the plate dimensions and materials can be entered, this includes the size of plate heat exchanger and chevron angle. Thermal design during heat exchanger design often overall heat transfer coefficient is used that connects the rate of heat transfer to the temperature difference of the system. There are many types of heat exchangers applied in the process industry. Jul 20, 2016 tema stands for tubular exchangers manufacturers association and is a set of standards that were developed by leading shell and tube manufacturers.
Heat transfer heat exchanger types of heat exchangers. In principle, there are two different types of pillow plates. The modules listed in the overview are linked to the corresponding pages. Unit operations lab heat exchanger 11 heat exchanger heat exchange is an important unit operation that contributes to efficiency and safety of many processes. 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. Heat exchangers are used in both cooling and heating processes. These devices can be used widely both in daily life and industrial applications such as steam generators in thermal power plants, distillers in chemical industry, evaporators and condensers in hvac applications and refrigeration process, heat sinks, automobile radiators and regenerators. Shell and tube exchangers a shell and tube heat exchanger is essentially a collection of tubes enclosed within a pressurized outer shell. Depending on the type of heat exchanger employed, the heat transferring process can be. Heat exchangers doehdbk1018 193 types of heat exchangers. A heat exchanger is a device used to transfer heat between two or more fluids. With this configuration the fluid is spread out over the multiple plates. Depending on the type of heat exchanger employed, the heat transferring process can be gastogas, liquidtogas, or liquidtoliquid and.
They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural. Heat exchangers are devices that transfer energy between fluids at different temperatures by heat transfer. The log mean temperature difference lmtd is derived in all basic heat transfer texts. You will also see that there are specific sites catered to different product types or categories, brands or niches related with applied numerical methods.
Finned tube heat exchanger or air cooled heat exchanger. There are many types of permanently bonded plate heat exchangers, such as dipbrazed, vacuumbrazed, and welded plate varieties, and they are often specified for closedloop applications such as refrigeration. This article focuses on heat exchangers, exploring the various designs and types available and. 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 exchangers. The heat exchangers effectiveness is calculated for different values of the flow rate between working fluids. The former commonly form the double walls of jacketed vessels, while the latter are assembled to a stack bank to manufacture pillow plate heat exchangers. Access the url below and click on the websimulator icon. 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. The simplest and cheapest type of shell and tube exchanger is with fixed tube sheet design. Lewis, in heat exchanger equipment field manual, 20. Ppt heat exchangers powerpoint presentation id1755346. The shellandtube heat exchanger is composed of a shell containing a large number of tubes. 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.
Different types of heat exchangers suited to different applications are currently available and the most common variants are outlined below. The heat conducting through solids, walls, or boundaries has to be continuously dissipated to the surroundings or environment to maintain the system in a steadystate condition. However, there is a disadvantage to smaller tubes if the fluid in your application is very viscous or has particulates, it can foul up the tube and undermine the heat transfer process. Examples of this type of heat exchanger are shell and tube exchangers. Hisaka websimulator hws plate heat exchanger this is the. This has resulted to different designs of heart exchangers which includes and not limited to. Common types of heat exchangers used in this application are the double pipe heat exchanger as well as the plate and frame heat exchanger.
They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. Understanding heat exchangers types, designs, applications and. If the tube is curved, with the shape of a u, it is called a utube. In process calculations, the main objectives of heat exchanger calculations are to determine the heat. A compact heat exchanger is a device characterized by a high heat transfer area per unit volume more than 300 m2m3. Our library is the biggest of these that have literally hundreds of thousands of different products. In a single pass heat exchanger, the fluid goes into one end of a tube and out the other. Plate heat exchangers a plate heat exchanger, phe, is a compact heat exchanger where thin corrugated plates some 0. There are different types of compact heat exchanger design available. The fluids can be single or two phase and, depending on the exchanger type, may be separated or in direct contact. Fixed tubesheet exchanger nonremovable tube bundle. The pass partitions are near full thickness with no mechanical or. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. Devices involving energy sources such as nuclear fuel pins or fired heaters are not normally regarded as heat exchangers although many of the principles.
It is through this technology that most of the industrial processes are successfully carried out. Other names are used for special cases, like condenser for the case when one. It may be written for a parallel flow or counterflow. Plate heat exchangers were first produced in the 1920s and have since been widely used in a great number of sectors a plate exchanger consists of a series of parallel plates that are placed one above the other so as to allow the formation of a series of channels for fluids to flow between them. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. The heat exchanger is an important component in every large industry. Shell and tube exchangers an overview sciencedirect topics. 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.