As its name implies, this type of heat exchanger consists of a shell a large vessel with a bundle of tubes inside it. 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. Classification of heat exchanger linkedin slideshare. As its name implies, this type of heat exchanger consists of a shell a large vessel. 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. A plate heat exchanger is a compact type of heat exchanger that uses a series of thin plates to transfer heat between two fluids. Aug 17, 2015 the heat exchanger will be supplied with oil, at 55o c 548. Because heat exchangers come in so many shapes, sizes, makes, and models, they are categorized according to common characteristics. Heat exchangers are crucial in thermal science and engineering because of their essential role across the landscape of technology, from geothermal and fossil power generation to refrigeration, desalination, and air conditioning. The basic design equation and overall heat transfer coefficient the basic heat exchanger equations applicable to shell and tube exchangers were developed in chapter 1. The es extended surface heat exchanger is designed as a compressor intercooler with the ability to cool large volumes of air with. Mechanical engineering heat and mass transfer nptel. Heat exchanger problem calculation lmtd and effectiveness.
Regenerative heat exchanger a regenerative heat exchanger, or more commonly a regenerator, is a type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid. The gas goes through various cleanup and pipedelivery processes to get to our stoves. The inspection of heat exchangers is the one area of equipment inspection where i firmly advocate the use of a check list to make sure you got everything. Exchanger inspection 101 visual inspection of shell and tube heat exchangers.
The optimum heat transfer rate takes place in a balanced counter flow heat exchanger and by using this optimum rate of heat transfer, the concept of heat exchanger efficiency is. Exchangers are initially oversized to allow for the. Heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 6 41 the cross. A heat exchanger is a system designed to transfer heat between two fluids to control the temperature of one of the fluids. The term heat exchanger applies to all equipment used to transfer heat between two streams. This is composed of multiple, thin, slightlyseparated plates that have very large surface areas and fluid flow passages for heat transfer. Counterflow heat exchangers the relation above for the log mean temperature difference is developed using a parallelflow heat exchanger, but we can show. Q is the rate of heat transfer between the two fluids in the heat exchanger in buthr, u is the overall heat transfer coefficient in btuhrft 2 o f, a is the heat transfer surface area in ft 2, and. The performance of a heat exchanger is very important for the conservation of energy, assurance of product quality, process viability and environmental protection. Lecture 65 heat exchanger testing lecture 66 heat exchanger testing continued. Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations.
Here, we will cite only those that are immediately useful for design in shell and tube heat exchangers with sensible heat transfer on the shellside. Heat exchange involve convection in each fluid and conduction through the separating wall. 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. Nptel provides elearning through online web and video courses various streams.
Heat exchangers have widespread industrial and domestic applications. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. Plate heat exchanger another type of heat exchanger is the plate heat exchanger. Nov 05, 2016 regenerative heat exchanger a regenerative heat exchanger, or more commonly a regenerator, is a type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid. Heat exchangers are practical devices used to transfer energy from one fluid to another. A variety of highintensity heat transfer processes are involved with combustion and chemical reaction in the gasi. This stacked plate arrangement can be more effective, in a given space, than the shell and tube heat exchanger. Space radiator a heat exchanger that transfers heat from the hot fluid to the surrounding space by radiation. 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.
Particulate fouling, taking place due to the accumulation of suspended particles in the fluid stream on the surface of the heat exchanger. Minimum amount of cooling water vibration free can provide internal demister low air side pressure drops cataract steel industries extended surface heat exchangers contact us today for a free. A shell and tube heat exchanger is a class of heat exchanger. Heat transfer and exergy analysis of a spiral heat exchanger article pdf available in heat transfer engineering 3712 october 2015 with 1,848 reads how we measure reads. 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. Heat exchanger design handbook mechanical engineering.
The heat exchanger will be supplied with oil, at 55o c 548. One common characteristic that can be used to categorize. Jul 01, 2016 because the cooler fluid exists the counter flow heat exchanger at the end where the hot fluid enters the heat exchanger, the cooler fluid will approach the inlet temperature of the hot fluid. Stefan boltzmann law, heat transfer, conduction, convecton, radiation. Multimedia edition of heat exchanger design handbook hedh is the standard reference source for heat transfer and heat exchanger design. If the heat exchanger is located at the inlet or discharge of a blower with a pulsating flow, such as a roots type rotary lobe blower, the heat exchanger must be protected from the pulsation by a chambered silencer. In cross flow heat exchangers, one fluid flows through tubes and second fluid passes around the tubes perpendicularly. The ratio of the heat transfer surface area on one side of the heat exchanger to the volume is used as a measure of compactness.
In this paper numerical and experimental analysis of compact heat exchanger has been done. Chapter 5 heat exchangers faculty of engineering and. Combining each of these resistances in series gives. The exchange can take place between a process stream and a utility stream cold water, pressurized steam, etc, a process stream and a power source electric heat, or between two process streams resulting in energy integration and reduction of external heat sources. To get fluid streams to the right temperature for the next process. Dynamic model and control of heat exchanger networks. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid. Balanced counter flow heat exchanger assuming and cc, then the lmtd becomes undefined as. Types of heat exchangers doehdbk1018193 heat exchangers. From the experimental data linearized mathematical model of heat exchanger is developed. Reason for heat exchangers a heat exchanger is a piece of equipment built for. Mechanisms of heat transfer university of oklahoma. Pdf heat transfer and exergy analysis of a spiral heat.
The heat transfer processes involved in these stages are generally less intense. Dynamic model and control of heat exchanger networks 6 1 introduction at the brobekk incineration plant in oslo waste from the surrounding area is burned in two furnaces. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and. Counter flow heat exchangers are the most efficient of the three types. Completely revised and updated to reflect current advances in heat exchanger technology, heat exchanger design handbook, second edition includes enhanced figures and thermal effectiveness charts, tables, new chapter, and additional topicsall while keeping the qualities that made the first edition a centerpiece of information for practicing engineers, research. Classification of heat exchangers transfer of heat from one fluid to another is an important operation for most of the chemical industries. In the aviation engineering, they have a fundamental role especially in reducing the temperatures of the fuel and thus increasing the efficiency of the. Gaitonde, department of mechanical engineering, iit bombay. The heat exchanger having a surface area density on anyone side greater than about 700 m2m3 is known as a compact heat exchanger. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Completely revised and updated to reflect current advances in heat exchanger technology, heat exchanger design handbook, second edition includes enhanced figures and thermal effectiveness charts, tables, new chapter, and additional topicsall while keeping the qualities that made the first edition a centerpiece of information for practicing engineers, research, engineers, academicians. Numerous articles have been published regarding the advantages of compact heat exchangers. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. The resulting energy is used to heat pressurized water, which is in turn heat exchanged with cold water from a district heating network operated by viken fjernvarme as.
Design strategy for controlling shell and tube heat exchangers trouble due to tool characteristics of heat exchanger changes with time. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. According to awad 2011, these phenomena can be divided into. Heat exchangers in the aviation engineering intechopen. T 2 represent the temperature difference between the two fluids at the two ends inlet and outlet of the heat exchanger. Theory and application two fluids, of different starting. For the heat transfer to occur two fluids must be at different temperatures and they must come thermal contact.
The two most common heat exchanger design problems are those of rating and sizing. Heat exchangers heat exchangers are used to transfer heat between two sources. This multimedia edition contains interactive features that bring the rigorous and authoritative material from hedh to life. Oct 18, 2016 heat exchanger numericals 1, ntu method. Learn for free, pay a small fee for exam and get a certificate.
Heat exchanger theory leads to the basic heat exchanger design equation. 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. The optimum heat transfer rate takes place in a balanced counter flow heat exchanger and by using this optimum rate of heat transfer, the concept of heat exchanger efficiency is introduced as the. Welcome to hedh multimedia heat exchanger design handbook. Heat exchangers 73 individual thermal resistances of the system. It is the most common type of heat exchanger in oil refineries and other large chemical processes. Introduction to heat exchangers bengt sunden lund institute of technology. Heat exchanger theory and the heat exchanger design equation. Mod05 lec04 pinch technology for heat exchanger network. Amjed ahmed example 1 in a counter flow heat exchanger, water is being chilled by a sodium chloride brine. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Heat exchanger the purpose of a heat exchanger is just thatto exchange heat. 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.
The most common application of heat transfer is in designing of heat. Nptel, online courses and certification, learn for free. Dec 10, 2008 lecture series on heat and mass transfer by prof. Heat exchangers are devices that facilitate the exchange of heat between two fluids that are at different temperatures. A sthe is the most common type of heat exchanger in oil re fineries and other large chemical processes, and is suited for higherpressure applications. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Minimum amount of cooling water vibration free can provide internal demister low air side pressure drops cataract steel industries extended surface heat exchangers.
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