The objectives of this integrated subject are to develop the fundamental principles and laws of heat transfer and to explore the implications of these principles for system behavior. Heat exchanger is a device for transferring heat from one medium to another. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. The oil provides an average convection coefficient ho 400 wm2k on the outside of the tubes. Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by literature correlations. Due to the high heat transfer efficiency of the plates, plate type heat exchangers are usually very small when compared to a tube and shell type heat exchanger with the. Counter flow heat exchangers are the most efficient of the three types. This is due to the larger area the plates provide over tubes. Introduction to heat transfer mechanical engineering. The control of heat within any facility is an important part of plant operation, whether by direct application e. Introduction to heat exchangers slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Contents preface li acknowledgments liii author lv chapter1 heatexchangers.
A heat exchanger is a component that allows the transfer of heat from one fluid liquid or gas to another fluid. In intercoolers, boilers, preheaters and condensers inside power plants as well as other engineering processes, heat exchangers are utilized for controlling heat energy. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. If you continue browsing the site, you agree to the use of cookies on this website. The important thing to remember is that a description of heat transfer requires that additional principles be. Heat exchanger performance is influenced by mixing finned both fluids unmixed unfinned one fluid mixed the other unmixed shellandtube heat exchangers baffles are used to establish a crossflow and to induce turbulent mixing of the shellside fluid, both of which enhance convection the number of shell and tube passes may be varied. 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. Compact heat exchanger, enhancements in heat exchanger, nano fluid, shell and tube heat exchanger.
Heat transfer heat exchanger types of heat exchangers. As an introductory course, it is particularly suited to those new to their role or industry. To design an heat exchanger, some factors and variables need to be considered. Pdf a heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Review of literature on heat transfer enhancement in heat.
They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural. Heat exchangers are designed to handle fluids, either gases or liquids. Types of heat exchangers shell and tube, plate type. The basic process heat and material balance is now in place, and the heat exchanger network the third layer can be designed. The process utility system may be a part of a centralised sitewide utility system. Introduction to shell and tube heat exchangers introduction general description identifying major components tema standards vibration. To heat a cooler fluid by means of a hotter fluid 2.
Heat exchangers jordan university of science and technology. This elearning course is aimed at individuals working the process industries who require a basic overview of the operation and uses of heat exchangers. Historic introduction of plate heat exchanger rules into asme and national board codes michael pischke ge power 2. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another.
Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. In a floating head heat exchanger, a removable cover may be incorporated into the shell at the floating end allows access to the floating head. Heat exchangers are used in both cooling and heating processes. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to. Arpaci, ahmet selamet, shuhsin kao the philosophy of the text is based on the development of an inductive approach to the formulation and solution of applied problems. In chemical engineering, we have to know how to predict rates of heat transfer in. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. Heat exchangers are devices for transferring heat from a hot flowing stream to a cold flowing stream. Introduction to heat exchanger free download as powerpoint presentation.
The remaining heating and cooling duties are handled by the utility system the fourth layer. Limitations on the heat exchanger length, diameter, weight, andor tube. Introduction to heat exchangers heat exchanger heat. The classic example of a heat exchanger is found in an. Introduction to heat exchangers free download as powerpoint presentation.
A heat exchanger is a device that is used to transfer thermal energy enthalpy. However, in those situations where a heat exchanger has. You do not need prior knowledge or experience to complete this course and it is assumed that you. The heat exchanger designs must balance between heat exchanger effectiveness and pressure drop to achieve the desired tradeoff between system. Heat exchanger the purpose of a heat exchanger is just thatto exchange heat. A heat exchanger is a system used to transfer heat between two or more fluids. 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. Introduction to heat exchanger heat exchanger heat. Explores the principle that heat transfer rests on, but goes beyond, thermodynamics. Introduction to heat exchangers heat exchangers are devices for transferring heat from a hot. Department of chemical and biomolecular engineering. Introduction heat exchangers are devices that facilitate the exchange of heat between two fluids that are at different temperatures while keeping them from mixing with each other. In counter flow heat exchangers the fluids enter the exchanger.
Heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids. 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. The aircooled heat exchanger is a device for rejecting heat from a fluid or gas directly to ambient air. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Introduction to heat exchangers bengt sunden lund institute of technology. The term heat exchanger applies to all equipment used to transfer heat between two streams. Heat transfer is the process of the movement of energy due to a temperature difference. Pdf heat exchanger lab experiment chemical engineering. Mean temperature differenc fore a counterflow heat exchanger 123 125 126 127. Heat exchanger hx is a device that provides heat exchange between two fluids that have temperature difference. Regenerative versus nonregenerative heat exchangers.
Heat exchangers are used to transfer heat between two sources. The recuperator or the throughthewall nonstoring exchanger the directcontact nonstoring exchanger the regenerator, accumulator, or heat storing exchanger. Introduction gas furnaces have earned a reputation for safe, reliable performance. The calculations we are interested in include determining the final temperatures of materials and how long. Heat exchangers influence the overall system efficiency and system size. It is a device that is used to transfer thermal energy from one body or fluid stream to another heat exchanger seminar ppt with pdf report heat exchangers are found widely scattered throughout the food process industry. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. Ideal as an introduction to engineering heat transfer. A shellandtube heat exchanger must be designed to heat 2. Heat exchangers are similar to pumps and vessels in that they are widely used in most process plants. However, the term is commonly used to equipment in which two.
The notes are intended to describe the three types of heat transfer and provide. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid. When cooling both fluids and gases, there are two sources readily available. To reduce the temperature of a hot fluid by means of a. Heat exchangers are an enabling technology for efficient power generation with a closed, recuperated brayton cycle using supercritical carbon dioxide sco 2 as the working fluid. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Two types of flow arrangement are possible in a doublepipe heat exchanger. Pdf heat exchanger types and classifications researchgate. Heat exchanger is widely applied to industrial process, power plant, transportation. Steps have been taken in designing these furnaces to prevent flue products from leaking into the home environment. This course is an introduction to the principal concepts and methods of heat transfer.
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 heat exchanger is a component that allows the transfer of heat from one fluid liquid or. It is the most common type of heat exchanger in oil refineries and other large chemical processes. A procedures manual was created for the doublepipe heat exchanger. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid. It is to be expected therefore, that the flow of the fluids through the exchanger will influence to a lesser or greater degree, the laying down of deposits on the surfaces of. Examples of the use of heat pipes are in the recovery of stored heat in solar home heating see problem 3. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and. Introduction of heat exchangers piping analysis youtube. Heat exchangers have widespread industrial and domestic applications. The heat exchanger should cost as little as possible provided that the above criteria are satisfied.
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