Note that the term recuperator is not commonly used in the process. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. 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 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. A heat exchanger is an equipment where heat energy is transferred from a hot fluid to a colder fluid. 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. These notes provide an introduction to engineering heat transfer. Pdf me6502 heat and mass transfer hmt books, lecture. The term heat exchanger applies to all equipment used to transfer heat between two streams. In the design of heat exchangers, the efficiency of the heat transfer process is very important.
Note that the term recuperator is not commonly used in the process industry for shell4 classification of heat exchangers. Heat exchanger design mechanical engineering department by sharon wenger june 11, 2015 heat exchanger design training. 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. Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. Here we have listed different units wise downloadable links of heat transfer notes where you can click to download respectively. Heat transfer objective questions and answers pdf free download for mechanical mcqs lab viva manual questions.
Warranty and service contact information is also included. Direct contact in this type of heat exchangers, heat transfer takes place between two immiscible fluids like a gas and a liquid coming into direct contact. Temperature profiles in a counterflow and b parallel flow single pass heat exchangers. As you can see, in a 12 heat exchanger, the tube side fluid flows the entire length of the shell, turns around and flows all the way back. 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. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Due to the custom nature of all xchanger heat exchangers, this manual discusses the characteristics and procedures that are common to all exchangers. Freestudy heat transfer tutorial 3 advanced studies this is the third tutorial in the series on heat transfer and covers some of the advanced theory of convection. 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. A lot of information is available regarding their design and construction.
Download me6502 heat and mass transfer hmt books lecture notes syllabus part a 2 marks with answers me6502 heat and mass transfer hmt important part b 16 marks questions, pdf books, question bank with answers. Examples of this type of heat exchanger are shell and tube exchangers, double tube exchangers and plate heat exchangers. The fi gure on the right represents the basic structure of a microchannel heat exchanger. Combining each of these resistances in series gives. Note that in a counterflow heat exchanger the outlet temperature of the cold fluid can exceed the outlet temperature of the hot fluid but this cannot happen in a parallel flow system. Pdf download sadik kakac, hongtan liu and anchasa pramuanjaroenkij by heat exchangers. Heat exchangers are devices used to transfer heat between two or more. Stacked, corrugated plates maximize contact with liquid or steam flowing through these brazed plate heat exchangers for faster heat transfer than shell and tube heat exchangers. In parallel flow heat exchangers, both the tube side fluid and the shell side fluid flow in same direction. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another. Also known as shell and tube heat exchangers, these transfer heat using liquid or steam that flows through the shell to heat or cool liquid in the tubes. Convective heat transfer from the outer tube wall to the outside fluid. On the other hand, according to their type of construction, exchangers are classified as. A piece of equipment built for efficient heat transfer from one medium to another.
Aa, bg, c, d, hp, hr, lc, and tv series heat exchangers. Heat exchangers are devices for the exchange of heat between two fluids, separated by a heat conducting partition, usually made of metal berk, 20. Outline introduction why we need to use a systematic approach to design heat exchangers what factors are needed to design a quality heat exchanger how do we approach that goal what. Shellandtube heat exchangers areused widely in the chemical process industries, especially in refineries, because of the numerous advantages they offer over other types of heat exchangers.
According to flow of fluids, the heat exchangers are classified into three categories. Heat exchanger lecture notes heat exchanger heat transfer. These materials were made available to students online, and formed the basis for class sessions. The latter types are called regenerators, recuperator surface exchangers. Heat exchangers jordan university of science and technology. Boilers and condensers in thermal power plants are the example of large industrial heat. Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. Ht pdf notes here you can get future notes of heat transfer pdf notes with unit wise topics. Heat exchangers are used to transfer heat between two sources.
Brazed plate heat exchanger air conditioning danfoss. Selection, rating, and thermal design written by sadik kakac, hongtan liu and anchasa pramuanjaroenkij is very useful for mechanical engineering mech students and also who are all having an interest to develop their knowledge in the field of design. The second type is regenerative type, in which hot and cold fluids are in the same space which contain a. The method suggested by nusselt and developed by kays and london is now being extensively used. 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. Note in the figures shown above that the hot stream may be cooled to t1 for counter flow, but may only be cooled to t2 for parallel flow.
Design of heat exchangers contents lecture notes on unit. Heat exchanger lecture notes free download as word doc. Heat exchangers are typically classified according to flow arrangement and type of. In most heat exchangers, the fluids are separated by a heat transfer surface, and ideally they do not mix. Heat transfer multiple choice questions skip to content engineering interview questions,mcqs,objective questions,class notes,seminor topics,lab viva pdf free download. Download as docx, pdf, txt or read online from scribd. This latter method is being used more and more nowadays. The present notes are intended only to serve as a brief introduction. Lmtd and ntu methods for analysis of heat exchangers. The designs include crossflow and counterflow coupled with various fin configurations such as straight fins, offset fins and wavy fins. When combined, the lecture notes below form a continuous document. We here focus on the thermal analysis of heat exchangers, but. The heat transfer notes pdf ht notes pdf book starts with the topics covering modes and mechanisms of heat transfer, simplification and forms of the field equation, one dimensional transient conduction heat transfer, classification of systems based on causation of flow, development of hydrodynamic and thermal boundary layer along a vertical plate, film wise and drop wise condensation, classification of heat exchangers, emission characteristics and laws of blackbody radiation, etc.
Javier tirenti page 11 an alternative to the fatigue analysis according to the provisions of part 5 div. The performance and efficiency of the brazed plate heat exchanger bphe have been proven through 30 years of constant development to ensure high thermal efficiency leading to energy savings in air conditioning systems. This type of heat exchanger uses sandwiched passages containing fins to increase the effectiveness of the unit. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. Note that the tubes in a shellandtube heat exchanger open to some large flow areas called headers at both ends of the shell, where the tubeside fluid. Shah rochester institute of technology, rochester, new york formerly at delphi harrison thermal systems, lockport, new york. 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. The table of contents and index below apply to the complete set of lecture notes. Heat exchangers 73 individual thermal resistances of the system. Heat exchangers find widespread use in power generation. Tlm is an exact representation of the average temperature difference between the hot and cold fluids. They are divided here for accessibility and ease of use.
Indirect contact in indirect contact type of heat exchangers, the hot and. The actual design depends on the specifi ed application. Heat exchangers are devices used to transfer heat between two or more fluid. Heat exchangers study notes for chemical engineering. Heat exchanger and its types engineering solutions. Some examples of directtransfer type heat exchangers are tubular, platetype, and extended surface exchangers. The most frequently used types are tubular heat exchangers and plate heat exchangers.
Plate type heat exchangers are not widely used because of the inability to reliably seal the large gaskets between each of the plates. The transfer of heat energy between the two fluids could be carried out. In this case, the two fluids enter the heat exchanger from the same end with a large temperature difference. Most shellandtube heat exchangers have multiple passes to enhance the heat transfer. Plate and fin heat exchangers are usually made of aluminum alloys, which provide high heat. Heat exchangers have widespread industrial and domestic applications. The tutorials are designed to bring the student to a level where he or she can solve problems involving practical heat exchangers.
Here is an example of a 12 1 shell pass and 2 tube passes heat exchanger. Pdf heat transfer pdf notes ht notes 2019 smartzorld. Common examples of direct contact heat exchangers are cooling towers, mix condensers and desuperheaters. Heat exchangers study notes for mechanical engineering. The notes are intended to describe the three types of heat transfer and provide. However, the term is commonly used to equipment in which two process streams exchange heat with each other. In multitubular or shell and tube heat exchangers, it is usual to combine. They are extensively used in the citrus processing industry for heating and cooling duties. The heat transfer notes pdf ht notes pdf book starts with the topics covering modes and mechanisms of heat transfer, simplification and forms of the field equation, one dimensional transient conduction heat transfer, classification of systems based on causation of flow, development of hydrodynamic and thermal boundary layer along a vertical. In other heat exchangers, heat transfer between fluids takes place through a separating wall or into and out of a wall in a transient manner.
1375 985 777 775 1014 881 1500 1259 655 1117 348 1503 827 677 1274 498 573 442 1554 1484 725 1444 645 973 1410 165 1295 1133 1190 867 1102 895 112 115 810 609 858 955