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. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 6 41 the cross. Heat exchangers are used in ac and furnaces the closedtype. Introduction to heat exchangers bengt sunden lund institute of technology. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. It provides relatively large area of heat transfer for a given volume of the equipment.
Heat exchangers jordan university of science and technology. Understanding heat exchangers types, designs, applications. Typical heat exchangers experienced by us in our daily lives include condensers and evaporators used in air conditioning units and refrigerators. The plate pack is assembled between a frame plate and a pressure plate, and compressed by tightening bolts fitted between these plates. Background, application, classification, common terminologies. A unique, singlesource volume offering essential material on heat exchanger design in a unified approach suitable to many applications, fundamentals of heat exchanger design details an indepth thermal and hydraulic design theory underlying twofluid heat exchangers for steadystate operation. Pdf heat and mass transfer books collection free download. Make an initial estimate of the overall heat transfer coefficient, u, based on. The term heat exchanger applies to all equipment used to transfer heat between two streams.
The hot fluid gets cooled, and cold fluid is heated. Introduction to thermal and hydraulic aspects, pressure drop and heat transfer, sizing and rating. Heat exchangers heat exchangers are used to transfer heat between two sources. Gaitonde, department of mechanical engineering, iit bombay. This example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom. Heat mass transfer analogy laminar boundary layer as noted in the previous chapter, the analogous behaviors of heat and mass transfer have been long recognized. 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. It features new sections on extended surfaces, twodimensional and transient conduction using finite difference methods, and the ntu method for heat exchanger design. 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 tubular heat exchanger consists of a set of tubes, the tube bundle typically contained within a shell.
How gasketed plate heat exchangers work alfa laval. Heat and mass transfer, is a bestseller in the area. General differential equation of heat conduction cartesian and polar coordinates one dimensional steady state heat conduction plane and composite systems conduction with internal heat generation extended surfaces unsteady heat conduction lumped analysis semi infinite and infinite solids use of. Heat transfer can be enhanced by a factor of up to 10 during nucleate boiling, and the critical heat flux by a.
Depending on the type of heat exchanger employed, the heat transferring process can be gastogas, liquidtogas, or liquidtoliquid and occur through a solid separator, which prevents mixing of the. Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. Overall heat transfer coefficient for doublepipe heat. Heat and mass transfer by rk rajput is a very popular book among mechanical engineering students. Introduction, heat conduction, thermal radiation, fluid mechanics, natural and forced convection, heat exchangers, boiling and condensation, introduction to mass transfer. 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 chemical engineering chemical engineering design ii joint initiative of iits and iisc funded by mhrd page 33 of 41 lecture 6. Heat transfer rate is the rate of heat energy transferred through a surface area. We are providing heat and mass transfer by rk rajput pdf. A device whose purpose is the transfer of thermal energy between two fluids. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. As shown in figure 1, the heat input vaporizes the liquid working fluid inside the wick in the evaporator section.
Nptel video course aerospace engineering jet aircraft propulsion. The tubes contain one fluid and the second fluid runs over or around the tubes, to either supply heat to or remove heat from the tube. Shellandtube heat exchangers can have multiple passes, such as 11, 12, 14, 16, and 18 exchangers, where the first number denotes the number of the shells and the second number denotes the number of passes. Energetic and exergetic analysis of a heat exchanger. The transfer of heat energy between the two fluids could be carried out. This giv es the amoun t of heat transferred betw een the oil in the pi p es and the w ater, it is assumed there.
A heat exchanger is a device in which heat is transferred from one fluid to another. A heat pipe is a two phase heat transfer device with a very high effective thermal conductivity. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Types of heat exchanger, process design of shell and tube heat exchanger, condenser, and reboilers. Enhancement of heat transfer in pool boiling surfaces that provide enhanced heat transfer in nucleate boiling permanently are being manufactured and are available in the market. It also includes chapters on heat transfer by conduction, heat transfer by radiation, heat transfer by convection, mass transfer, and objective type question bank.
These books are used by students of top universities, institutes and colleges. Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. Heat transfer nptel online videos, courses iit video lectures. Me6502 heat and mass transfer hmt syllabus unit i conduction. An odd number of tube passes is seldom used except the 11 exchanger.
Shellandtube heat exchangers kerns description of shell. Put simply, a heat exchanger is a device which transfers heat from one medium to another, a hydraulic oil cooler or example will remove heat from hot oil by using cold water or air. Classification of heat exchangers transfer of heat from one fluid to another is an important operation for most of the chemical industries. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Fundamentals and design analysis usb media storage type. Convectionthermal boundary layer, dimensionless parameters in free and forced convective heat transfer, heat transfer correlations for flow over flat plates and through. Types of heat exchangers heat exchanger analysis lmtd method. Aregenerative heat exchanger has a single flow path, which the hot. Mar 26, 2020 platefin heat exchangers have lots of thin metal plates or fins with a large surface area because that exchanges more heat more quickly. Home diffusion bonded heat exchangers and support heatric.
Radiation radiative heat transfer, stefanboltzmann law, wiens displacement law, black and grey surfaces, view factors, radiation network analysis. Basic concepts mechanism of heat transfer conduction, convection and radiation fourier law of conduction general differential equation of heat conduction. Introduction a heat exchanger is a device in which two fluid streams, one hot and another cold, are brought into thermal contact in order to effect transfer of heat from the hot fluid stream to the cold. Aloke kumar ghosal, department of chemical engineering, iit guwahati. The book includes chapters on the basic concepts of heat and mass transfer. The basic process heat and material balance is now in place, and the heat exchanger network the third layer can be designed. Indranil ghosh iit kharagpur july 2018 lecture 32 20. The heat exchange duty a llows calculation of the log mean.
Heat lecture 9 cm3110 1272015 3 vapor phase liquid phase tsat t tsat film boiling resistance to heat transfer as. Also, the incorporation of software optimization with the process pinch methodology allows proii to optimize heat exchanger areas while maintaining stream target temperatures. 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. 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. Counter flow heat exchangers are the most efficient of the three types. Alternatively a swimming pool heat exchanger uses hot water from a boiler or solar heated water circuit to heat the pool water. Pdf heat and mass transfer by rk rajput pdf free download. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. A heat exchanger is an equipment where heat energy is transferred from a hot fluid to a colder fluid. The present study has focused on the use of coil heat exchangers ches with microencapsulated. Heat transfer online course video lectures by iit guwahati. This is a multiphysics model because it involves fluid dynamics coupled with heat transfer. Mod04 lec17 heat transfer corelations for flow across tube banks mod04 lec18 momentum and heat transfer analogies mod04 lec19 boundary layer heat transfer. The most common application of heat transfer is in designing of heat.
The notes are intended to describe the three types of heat transfer and provide. Tube side pressure drop in case of tube side condensation. A recuperative heat exchanger has separate flow paths for each fluid and fluids flow simultaneously through theexchanger exchanging heat across the wall separating the flow paths. Examples are water cooling towers and jet condensers in. Heat transfer of a multiple helical coil heat exchanger using a microencapsulated phase change material slurry. Based on the type of flow, calculate log mean temperature difference, lmtd. Heat exchangers are devices used to transfer heat energy from one fluid to another. Heat exchangers are devices designed to transfer heat between two or more fluidsi. This course covers problems of heat and mass transfer in. Noc heat transfer and combustion in multiphase systems. Introduction to heat transfer general heat conduction equation one dimensional steady state conduction in rectangular coordinate,cylindrical and spherical coordinate ritical and optimum insulation extended surface heat transfer analysis of lumped parameter model transient heat flow in semi infinite solid infinite body subjected to sudden convective graphical. Applications of heat exchangers heat exchangers prevent car engine overheating and increase efficiency heat exchangers are used in industry for heat transfer. Boilers and condensers in thermal power plants are examples of large industrial heat exchangers. It is a vacuum tight device consisting of an envelope, a working fluid, and a wick structure.
To determine the working conditions and the performances of the solid biomassfuelled microchp systems and of their components, an energetic analysis is mostly applied 1,2,5,6. Nptel provides elearning through online web and video courses various streams. Balanced counter flow heat exchanger assuming and cc, then the lmtd becomes undefined as. Conduction and convection are the two way which are more concern in case of heat exchangers.
Heat transfer nptel online videos, courses iit video. Jul 01, 2016 heat can flow only from hotter to cooler fluids, as per the second law of thermodynamics. Alternative design approach for spiral plate heat exchangers. How gasketed plate heat exchangers work in a gasketed plate heat exchanger, the plates are fitted with elastomeric gaskets which seal the channels and direct the fluids into alternate channels. Heat exchangers can be classified into four types, according to. Heat integration is performed in central heat exchanger networks hens, where hot and cold process streams from the basic process subsystems bps are sent to the hen, from where they reach their required thermal final states and are then sent back to the bps or outside the system as products, byproducts, or waste. Heat can be transferred between the same phases liquid to liquid, gas to gas, or phase change can occur on either the process side. Heat exchangers study notes for mechanical engineering. What is the difference between a recuperative and a. The prerequisites for this course are the undergraduate courses in thermodynamics and fluid mechanics, specifically thermal fluids engineering i and thermal fluids engineering ii or their equivalents. Lecture 1 introduction on heat and mass transfer youtube.
The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Mechanical vibrations nptel online videos, courses iit. 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. In the field of gas turbine heat transfer, several experimental studies have been done with mass transfer because of its experimental advantages. A 12 shellandtube heat exchanger is illustrated in figure 5. Heatric, part of the meggitt group, is the world leader in diffusion bonded heat exchangers. Purpose and uses of air cooled heat exchangers 2 basic heat transfer principles 3 air cooler components 6 type of aircooled heat exchangers 8 coil or bundle design and construction finned tubes 16 air plenum design 19 air movers types and general laws 21. Heat exchangers a device whose primary purpose is the transfer of energy between two fluids is named a heat exchanger. Heat exchanger heat exchanger performance, lmtd and ntu methods. Heat exchanger problem calculation lmtd and effectiveness. Apr 19, 2012 introduction a heat exchanger is a device in which two fluid streams, one hot and another cold, are brought into thermal contact in order to effect transfer of heat from the hot fluid stream to the cold. Calculate the heat transfer area of the double pipe heat exchanger in the lab. Mod07 lec31 effectivenessntu, method of heat exchanger analysis. Lecture 22b flows with friction and heat transfer, normal and oblique shocks.
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