However, there is a disadvantage to smaller tubes – if the fluid in your application is very viscous or has particulates, it can foul up the tube and undermine the heat transfer process. Scribd will begin operating the SlideShare business on December 1, 2020 We have almost a century of quality craftsmanship guiding the way we apply new learnings. Gaskets, while more susceptible to failure under pressure, are inexpensive and easy to replace. If you continue browsing the site, you agree to the use of cookies on this website. 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 same heat transfer capacity. PHEs are overtaking shell and tube options in many sectors due to compactness, efficiency and ease of maintenance. Classification and types of Heat Exchangers. In general, this is a good option for passive heating or cooling a storage tank (such as a bright beer tank or dairy tank) where refrigeration or heating would otherwise be expensive. Shell and Tube Heat exchangers can be used for wide temperature and pressure range. Plate type heat exchangers are not widely used because of the inability to reliably seal the large gaskets between each of the plates. The hot and cold fluids alternate between each of the plates. At the ends of the tubes, the tube side fluid is separated from the shell side fluid by the tube sheet(s). We hope you enjoy! Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A basic understanding of the mechanical components of a heat exchanger is important to understand how they function and operate. 3. If you wish to opt out, please close your SlideShare account. Animation of typical shell and tube type heat exchanger is shown in the picture. To boil a liquid while condensing a hotter gaseous fluid. This article explains the basic qualitative differences between common heat exchangers to help you decide which is most appropriate for your application. There are two inputs and two outputs, and the spaces between plates alternate between the two liquids (hot, cold, hot, cold, etc. The baffles are used to support the tubes, to direct the fluid 2. • According to the type of construction (shell and tube type or plate type); If a plate heat exchanger is brazed or welded, it’s very difficult and expensive to add plates after the fact. APIdays Paris 2019 - Innovation @ scale, APIs as Digital Factories' New Machi... No public clipboards found for this slide, Heat exchanger: Shell And Tube Heat Exchanger. as shown above, right). They can all be effective in a variety of heat transfer applications, but optimizing efficiency, cost and space depends heavily on the particular process in which the heat exchanger is installed. This is due to the larger area the plates provide over tubes. Among the most common types of heat transfer equipment used in industrial applications are the various configurations of shell-and-tube heat exchangers. In systems where the two fluids are at vastly different pressures, the higher pressure fluid is typically directed through the tubes and the lower pressure fluid is circulated on the shell side. This plate causes the shell fluid to travel down one half of the tube bundle, then down the other half, in effect producing a counter-current flow pattern which is best for Heat Transfer. Plate type heat exchanger consists of plates instead of tubes to separate the hot and cold fluids. With every piece of processing equipment we build, our goal is to have lasting impact. June 30, 2019 A heat exchanger is a component that allows the transfer of heat from one fluid (liquid or gas) to another fluid. Teaching and sharing ideas has long been part of the rich heritage at Paul Mueller Company. They also offer the indispensable benefit of modularity – a gasketed plate heat exchanger can be completely disassembled, and plates can be added to increase capacity at any time. A shell and tube exchanger consists of a number of tubes mounted inside a cylindrical shell. Because each of the plates has a very large surface area, the plates provide each of the fluids with an extremely large heat transfer area. While all plate heat exchangers have corrugated plates, they can differ by how they seal the plates together. Regardless of the function the heat exchanger fulfills, in order to transfer heat, the fluids involved must be at different temperatures and they must come into thermal contact. Figure 1 illustrates a typical unit that may be found in a petrochemical plant. components of this type of heat exchanger are the tube bundle, shell, front and rear end headers, and baffles. Equation-4 Where, we get the A Overall (overall heat transfer area required) from the heat transfer rate equation (Equation-1). In almost any power, chemical, or mechanical system, heat must be transferred from one place to another or from one fluid to another. Heat exchangers are classified in many ways: In this construction, tube bundle can be removed from the heat exchanger shell for inspection & cleaning (of both sides) and replacement of bundle (using the old shell and channel). The prototypical shell and tube heat exchanger has only one inner tube, and is typically used to teach engineering students the basic concept of a heat exchanger. 10,865 Views. Shell and tube heat exchangers dominated the heat exchanger market up until the latter part of the 20th century, as plate heat exchangers began to replace them in many industrial and most HVAC applications.Due to their simple design, they also hold a prominent place in engineering curricula around the globe. Pressure Drop of Different Shell Types F shell 8 x ΔPE shell G shell 1 x ΔPE shell H shell 1/8 x ΔPE shell J shell 1/8 x ΔPE shell X shell <1/100 x ΔPE shell 15. Because of this problem, plate type heat exchangers have only been used in small, low-pressure applications such as on oil coolers for engines. The heat from one fluid passes across the metal (which is thermally conductive) into the other fluid without the fluids making contact. During operation, the floating tubesheet floats/ slides inside the shell which compensates for the differential thermal expansion between tubes and shell without using costly expansion bellows. Heat exchangers all work by passing a hot fluid and a cold fluid across opposite sides of a piece of metal. To condense a gaseous fluid by means of cooler fluid. Also, if there is a defect in a plate, you can simply remove two plates and put the unit right back in service at slightly lower capacity while you wait for replacements. Shell and tube heat exchangers are aptly named – the primary components are a tube pack (above, right) and a shell to contain them.

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