The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside. 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. Plate fin heat exchangers a plate fin heat exchanger is a form of compact heat. Heat exchangers are extensively used in diverse industries covering power generation. Pdhonline course m371 2 pdh shell and tube heat exchangers.
Heat exchangers fundamentals and design analysis prof. So, here also we can use the extended surfaces or fins. The profitability of an investment in waste heat recovery depends heavily on the efficiency of heat exchangers and their associated life cycle costs purchase, maintenance, etc. Mod05 lec04 pinch technology for heat exchanger network. Moholkar,department of chemical engineering,iit guwahati. 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.
Heat transfer nptel online videos, courses iit video. Heat exchanger 2 lmtd method counter flow heat exchanger multipass and cross flow heat exchangers in these heat exchangers, the correction factor is used where the log mean temperature difference is expressed as. Understanding heat exchangers types, designs, applications. The course can also serve as a refresher for graduate students. Although heat exchangers come in every shape and size imaginable, the construction of most heat. Jul 02, 2014 lecture series on heat and mass transfer by prof. Let us say that there will be i mean there we need heat exchange between 2. The notes are intended to describe the three types of heat transfer and provide. The heat is transferred from the hot fluid to the metal isolating the two fluids and then to the cooler fluid. 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. Companies dealing with the design and fabrication of heat exchangers, auto mobile industries, process industries, oil refineries. Mod07 lec29 various types of shell and tube heat exchangers. It is a very efficient device of transferring heat from a point of high temperature to a point of low temperature. Combining each of these resistances in series gives.
They are the most versatile type of heat exchangers. Understanding the fundamentals governing heat transfer is key to designing equipment that involves heat exchange. 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. Nptel chemical engineering chemical engineering design ii joint initiative of iits and iisc funded by mhrd page 2 of 21 lecture 1. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction. Aa, bg, c, d, hp, hr, lc, and tv series heat exchangers. Here, we will cite only those that are immediately useful for design in shell and tube heat exchangers. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectivenessnumber of.
Tm is the log mean temperature difference given as t t. This quantity is called the number of transfer units ntu and is expressed as. Types of heat exchanger, process design of shell and tube heat exchanger, condenser, and reboilers. Companies dealing with waste heat recovery and renewable. Boilers and condensers in thermal power plants are the example of large industrial heat exchangers. Shell diameter should be selected in such a way to give a.
Apr 19, 2012 shell and tube heat exchanger shell and tube heat exhangers are one of the most common heat exchange equipment found in all plants. Now we will try to go in details about this shell and tube heat exchangers. Dec 10, 2008 lecture series on heat and mass transfer by prof. Plate fin heat exchangers a plate fin heat exchanger is a form of compact heat exchanger consisting of a block of alternating layers of corrugated fins and flat separators known as parting sheets. Pinch analysis principles will be applied to identify the energy saving potential or target. A heat exchanger is an equipment where heat energy is transferred from a hot fluid to a colder fluid.
Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Warranty and service contact information is also included. Heat exchangers are used to transfer heat between two sources. Classification of heat exchangers transfer of heat from one fluid to another is an important operation for most of the chemical industries. Sep, 2019 the latter types are called regenerators, recuperator surface exchangers. Different designs all these factors vary considerably between different heat exchanger technologies. Such devices for efficient transfer of heat are generally called heat exchanger. View notes mod1 from ech 143 at hanoi university of mining and geology. Nptel chemical engineering chemical engineering design ii joint initiative of iits and iisc funded by mhrd page 2 of 41 lecture 1. And today we will be talking about the shell and tube heat exchangers in details, but before going to that in. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and. Due to different requirement we have got different construction of heat exchanger. 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.
A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Boilers and condensers in thermal power plants are examples of large industrial heat exchangers. Wheeled mobile crusher is also known as portable crusher or mobile crushing plant. A key component in waste heat recovery is the heat exchanger.
Nptel online videos, courses iit video lectures well organized. Heat exchangers 73 individual thermal resistances of the system. Noc heat transfer and combustion in multiphase systems. They can operate at high pressures, are easy to clean and can be made of a wide variety of. Heat exchanger design pdf nptel tollersofredheadangels. Sukhatmes course on heat and mass transfer, based on incropera. 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.
Plate type heat exchangers are not widely used because of the inability to reliably seal the large gaskets between each of the plates. Dense arrays of finned tubes or plates flow passages that are typically small less than about 5 mm for typical applications one fluid is a gas with low convection coefficient very large heat transfer surface area per unit volume, a s v. Introduction to heat exchangers bengt sunden lund institute of technology. This type provides a large heat transfer surface in a small space. In a heat exchanger there is no direct contact between the two fluids. There are heat exchangers in our automobiles in the form of. Fundamentals and design analysis usb media storage type. The solution is heated in the heat exchanger without boiling and the superheated solution flashes off partially evaporated at a lower pressure are reduced in the flash chamber. One can easily show that thermodynamically, the most efficient heat exchanger is the counterflow heat exchanger figure 5. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural. 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. So, again we are back in our course on heat exchangers. A piece of equipment built for efficient heat transfer from one medium to another.
Due to the custom nature of all xchanger heat exchangers, this manual discusses the characteristics and procedures that are common to all exchangers. Noc heat exchangers fundamentals and design analysis. Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. 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. Process design decisions and project economics by dr. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. Heat exchangers have widespread industrial and domestic applications. Iits and iiscs free open online web and video courses for science and engineering under nptel similar websites like nptel. To get fluid streams to the right temperature for the next process.
Mar 22, 2016 effectiveness relations of the heat exchangers typically involve the dimensionless group uas cmin. Gaitonde, department of mechanical engineering, iit bombay. All the companies generating coal based and nuclear based power ntpc, different state electricity boards, cpri, barc, and npcl etc. Tlm,cf is the log mean temperature difference for a counter flow heat exchanger. Heat exchangers study notes for mechanical engineering. The transfer of heat energy between the two fluids could be carried out. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. 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 transfer nptel online videos, courses iit video lectures. Proceedings of icapp 08 anaheim, ca usa, june 812, 2008 paper 8009 design considerations for compact heat exchangers david southall, renaud le pierres, and stephen john dewson. The hot utility demand of the process is 1200 units shown by h and the cold utility demand is 360 units shown by c.
Shell and tube heat exchanger shell and tube heat exhangers are one of the most common heat exchange equipment found in all plants. Nptel chemical engineering chemical engineering design ii lecture 1. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Thermal design and optimization of heat recovery steam. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another.
Aloke kumar ghosal, department of chemical engineering, iit guwahati. This course for undergraduate students covers the fundamental aspects and quantitation of different modes of heat transport. Heat exchangers heat exchangers are used to transfer heat between two sources. Shell shell is the container for the shell fluid and the tube bundle is placed inside the shell. Mechanical design standards of shell and tube heat exchangers mechanical design of heat exchangers includes design of various pressure and nonpressure parts. The pump pumps feed and liquor from the flash chamber and forces it through the heat exchanger tubes back to the flash chamber. So, we will start with the tubular heat exchanger where the simplest geometry that we have already discussed about is tube in tube or more commonly known as. Heat exchangers are practical devices used to transfer energy from one fluid to another. Handout that help students for design of heat exchangers based on kerns method. Heat exchangers are also abundant in chemical and process industries. Since all heat exchangers considered in this experiment have a single pass for both the hot and cold fluids, the discussion below is limited to singlepass heat exchangers.
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