The fluids can be single or two phase and, depending on the exchanger type, may be separated or in direct contact. It varies somewhat with temperature, and in various heat transfer situations an. Types of heat exchangers industrial heat exchanger. The devices that are used to facilitate heat transfer between two or more fluids at different temperatures are known as heat exchangers. Find out ntu from the ntu relationships for different types of heat. The actual design of heat exchangers is a complicated problem. They can also be classified into parallel and counter flow types. Simplified heat exchanger design calculations2 if inlet and outlet temperatures and one mass flow rate are known 1. Many types of heat exchangers have been developed for use in steam power. As a heat exchanger, the adiabatic wheel acts as a mechanism for storing the heat before it is. These are also known as recuperators heat exchangers. Table 1 shows the different heat exchanger types tested, table 2 gives an overview of the. Cross or counter flow as per their construction materials 1. Shellandtube heat exchangers are the most widely used heat exchangers in process industries because of their.
Experimental comparison of two heat exchanger concepts for latent. 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. A heat exchanger is a piece of equipment built for efficient heat transfer. In the present work, two different types of heat exchangers are experimentally compared, namely a finandtubes. 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. A third 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. Perhaps the simplest is the concentric tube or doublepipe heat exchanger shown in figure 1, in which one pipe is placed inside another. Although heat exchangers come in every shape and size imaginable, the construction of most heat exchangers fall into one of two categories. 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 convection refers to heat transfer that occurs between a surface and a moving fluid which are different temperatures. Platetype heat exchangers consist of a large number of thin, vertical steel plates that. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Each of these components is available in a number of standard designs. Review of literature on heat transfer enhancement in compact heat exchangers acrc tr105.
A compact heat exchanger is a device characterized by a high heat transfer area per unit volume more than 300 m2m3. Adiabatic wheel heat exchangers the term adiabatic pertains to the thermodynamic process that happens without any loss or gain in heat. Heat exchangers are manufactured from robust materials, have no moving parts and operate at a variety of different pressures and temperatures, therefore if a heat exchanger is used in the correct way then there is no reason why it shouldnt be able to remain operational for many years. Types of heat exchangers classification of heat exchangers. Different types of heat exchangers are shown in figure 42. Types of heat exchangers used on ship marine insight. Heat exchangers, their types and applications oil and. Calculate q and the remaining mass flow rate using energy conservation 2. The heart of the heat exchanger contains a fully welded circular plate pack made by pressing and cutting round plates and welding them together. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions. The dominant type of heat exchanger in process plants.
Aug 09, 2017 heat exchangers all work by passing a hot fluid and a cold fluid across opposite sides of a piece of metal. Oil cooling oil of the engine main lubrication circuit, the manual and automatic. A heat exchanger is a device built for efficient heat transfer from one medium to another. One of the contributions of this paper is the presentation of heat. The selection of a heat exchanger depends on many factors including capital and operating costs, fouling, corrosion tendency, pressure drop, temperature ranges, and safety issues tolerance to leakage. The different types of heat exchangers are classified in three main categories. Additionally, heat exchangers may be classified according to the type of fluid used.
John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 4 41. In shell and tube heat exchangers, one fluid flows through a set of metal tubes while the second fluid passes through a sealed shell that surrounds them. Comparison of heat exchanger types china stainless steel. Contents preface li acknowledgments liii author lv chapter1 heatexchangers. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. There are two inputs and two outputs, and the spaces between plates alternate between the two liquids hot, cold, hot, cold, etc. Review of literature on heat transfer enhancement in. Counter flow heat exchangers where the fluids enter in the exchanger from opposite sides.
Tema heat exchanger designations front end head types part 1 of 3 shell and tube heat exchangrs can be divided into three major parts, these parts are the front head, shell section, and rear head. Comparison of heat exchanger types each of the three types of heat exchangers parallel, cross and counter flow has advantages and disadvantages. Convection heat transfer is subdivided into two different kinds according to the nature of the flow. Types of heat exchangersall heat exchangers do the same jobpassing heat from one fluid to anotherbut they work in many different ways. The heat in the gas is transferred into a liquid, usually water or a thermal oil. A heat exchanger is a device used to transfer heat between two or more fluids. Heat exchanger design handbook by kuppan thulukkanam.
Heat transfer heat exchanger types of heat exchangers. 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. Typically in the manufacturing industry, several differing types of heat exchangers are used for just one process or system to derive the final product. Types of heat exchangers shell and tube, plate type. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. There are also a number of different types of heat exchangers that you can get depending on what you are looking for. Heat on its own does not mean anything, and is typically the amount of energy one thing has, compared to another thing. 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. Chapter 5 heat exchangers faculty of engineering and. Choosing the right heat exchanger hx requires some knowledge of the different heat exchanger types, as well as the environment where the unit must operate. Shellandtube heat exchangers accounts for more than 50% of all heat exchangers installed. 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.
Nov 15, 2016 not to disagree with the previous answer, but those are forms of heat transfer. Heat transfer and entropy analysis of three different types of heat exchangers operated with nanofluids. Heat exchangers 73 individual thermal resistances of the system. For parallelflow bphes, there are two different flow configurations. In general, for the calculation and design of the different components of heat. Combining individual film coefficients into an overall coefficient of heat. Pdf heat exchanger types and classifications researchgate.
Optimization of circuitry arrangements for heat exchangers. Plate heat exchangers also differ in the types of plates that are used, and in the. Combining each of these resistances in series gives. Devices involving energy sources such as nuclear fuel pins or fired heaters are not normally regarded as heat. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction.
Such types of heat exchangers are used predominantly in air conditioning, humidification, industrial hot water heating, water cooling and condensing plants. A shell and tube heat exchanger with a 25% baffle cut was used in this study. They transfer heat by convection and by conduction through the wall. Finned tube heat exchanger or air cooled heat exchanger. Since the heat transfer coefficient is high with the liquid flow, there is no need to use fins. Heat exchangers have widespread industrial and domestic applications. In the most commonly used type of heat exchanger, two fluids of different temperature flow in spaces separated by a tube wall.
There are different types of compact heat exchanger design available. In industries, heat exchangers are used in industrial process to recover heat between two process fluids. Carrier system design manual, carrier air conditioning co. 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. Other approaches to control fouling control combine the blind application of. Fluids can pass through the bphe in different ways. Both the tube and shell fluids are pumped into the heat exchanger and therefore heat transfer is by forced convection.
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. Types of hot water heat exchanges brazetek heat exchangers. Plate fin heat exchangers are usually made of aluminum alloy with varied designs such as cross flow, counter flow, along with different types of fins which result in very effective heat. The most important difference between these four basic types lies in the relative. Temperature profiles of the main kinds of thermal behavior are indicated on figure 8. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. 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. You can see heat exchangers in all kinds of places, usually working to heat or cool. 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.
Gasketed plate heat exchangers hxxxliquid gasketed plate heat exchangers are particularly suitable for large fl ows and high cooling capacities. Shell and tube heat exchangers are widely used and very popular in the process industry, due to their versatility. Heat exchangers are manufactured with various flow arrangements and in different designs. The basic principle of its use is to transfer heat.
Vasilev 6 explains about different types of heat pipes like conventional heat pipes, loop heat pipes, vapour dynamic thermosyphons, spaghetti heat pipes, sorption heat pipes etc. It is through this technology that most of the industrial processes are successfully carried out. This type of heat exchangers can be adopted by using either the tube bundles or plate exchangers. Gbhepeghea506 selection of heat exchanger types information contained in this publication or as. A third type of heat exchanger is a plate and shell heat exchanger, which combines plate heat exchanger with shell and tube heat exchanger technologies. The media may be separated by a solid wall, so that it never mix or may be in direct contact. The rate of change of angular momentum in the limit. A plate type heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids.
Heat exchangers are devices that transfer energy between fluids at different temperatures by heat transfer. In actuality, most large heat exchangers are not purely parallel flow, counter flow, or cross flow. Most direct contact heat exchangers fall under the gas liquid category, where heat is transferred between a gas and liquid in the form of drops, films or sprays. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. The two most common kinds of heat exchanger are the shellandtube and platefin. A finned tube heat exchanger, air cooled heat exchanger. Heat exchanger, heat, turbulent flow, efficiency, heat transfer 1. The heat from one fluid passes across the metal which is thermally conductive into the other fluid without the fluids making contact. The types of exchangers are mainly defined by their construction and are as follows. Heat exchangers are components that allow the transfer of heat from one fluid liquid or gas to another fluid.
The reason for the combination of the various types is to. Comparison of heat exchanger types parallel heat exchanger. Shell and tube heat exchangers are used in various industrial processes, and are one of the most commonly used heat exchangers. This has a major advantage over a conventional heat exchanger in that the. The fluids may be separated by a solid wall to prevent mixing. Other articles where plate heat exchanger is discussed. Numerical study of shell and tube heat exchanger with. As in all mechanical devices, each type has its advantages and disadvantages.
Selection of heat exchanger types linkedin slideshare. Plate heat exchangers, heat exchanger, air cooled heat. Optimization of circuitry arrangements for heat exchangers using derivativefree optimization nikolaos ploskas. Engines in cars, ships, and planes use heat exchangers to work more efficiently, gas. A piece of equipment built for efficient heat transfer from one medium to another. Composite heat exchangers combine the best features of their parent. Different types and sizes of heat exchangers are used in steam power plants, chemical processing units, building heating and air conditioning, house hold. Pdf a heat exchanger is a heat transfer device that exchanges heat between two or more process. Allwelded compact heat exchangers are very compact compared to shell andtube heat. The heated liquid can be then used in an application where you would normally use even more energy to heat it up. However, in many cases, there are more attractive alternatives in terms of cost and energy recovery. Finned tube heat exchangers are often used for heat recovery in processes that exhaust hot gasses.
The stack of heat transfer plates and gaskets is clamped together with bolts in a frame. Heat exchangers are typically classified according to flow arrangement and type of construction. Plate and frame heat exchanger plate heat exchangers plate heat exchangers are constructed with a series of plates held together in a large frame. Heat exchangers are used in both cooling and heating processes. The development of nanotechnology has witnessed an emergence of new generation of heat transfer fluids known as nanofluids. Sahinidis abstract optimization of the refrigerant circuitry can improve a heat exchangers performance. Heat exchangers comparison compare different heat exchangers. The plates themselves are available in different geo metries and patterns as well as choice of materials. Many types of heat exchangers have been developed for use in steam power plants, chemical processing plants, building heat. Almost all the systems onboard ship depends on heat exchanger where the fluid is either cooled or heated. Heat exchangers, cross flow, parallel flow, and counter flow.
Devices involving energy sources such as nuclear fuel pins or fired heaters are not normally regarded as heat exchangers although many of the principles. This counter flow type of heat exchangers is the most efficient as more heat can be transferred at the same amount of time. The heat exchanger is an important component in every large industry. In this case, the two fluids enter the heat exchanger from the same end with a large temperature difference. A heat exchanger is a system used to transfer heat between two or more fluids. Wine and fruit juices are normally deaerated prior to pasteurization in order to remove oxygen and minimize oxidative deterioration of the products. In counter flow heat exchangers, the two fluids flow in. Additionally, heat exchangers may be classified according to the type of fluid used liquidtoliquid. Heat exchangers heat exchangers are one of the most common pieces of equipment found in all plants. Nanofluids are used as coolants which provide excellent thermal performance in shell and tube heat. The type of heat exchanger used for a particular usage depends on the application and requirement.
In this article, we will take a details look at equations required for shell and tube heat exchanger sizing and design. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Heat exchanger and its types engineering solutions. 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. Example of a tube design combining longitudinal seam welding and folding which is. Their are many types of heat exchanger as per their flow arrangement 1. Oct 11, 2019 different types of heat exchangers are used onboard a ship.575 185 1478 1176 68 904 176 1562 1467 58 646 548 824 487 1442 1141 1439 1575 549 1048 1581 1167 1300 19 245 1356 1410 1082 1368 1568 605 951 473 791 573 1504 1551 735 1406 507 732 1283 119 723 400 785