Calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. Shell and tube heat exchanger step by step calculations to. Multi shell and tube heat exchangers bem estimation spreadsheet. The cylindrical shell containing the tube plates is extended at each end beyond the tube. In addition, a number of different head and shell designs are. Calculate q and the outlet temperature using energy conservation 2. True log mean temperature differences are only valid in doublepipe or tubular heat exchangers. Q the rate of heat transfer between the two fluids in the heat exchanger in buthr kjhr for s. Oct 07, 2012 plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. In designing the heat exchanger, i put superheated steam 200c saturated steam 100c to heat water from 25c to 60c. Because this is so many, i think i will divide the topic into three topics. Shell and tube heat exchanger design software for thermal. Selection of heat transfer models and fouling coefficients for shell side and tube side. How can i calculate shell diameter of a shell and tube.
Determines the preliminary size for a shell and tube heat exchanger based on the process information provided. The required heat transfer area, the number of tubes and the shell size are. Heat transfer theory tells us that the log mean temperature difference is the average temperature difference to use in heat exchanger design equation calculations. But some times, you may prefer to or have to do the design calculations manually. Define design parameters such as number of tube passes, tube size, shell. In designing shell and tube heat exchangers, to calculate the heat exchange. Design of shell and tube heat exchanger layout design. The cylindrical shell containing the tube plates is extended at each end beyond the tube plate, the extended portion being divided into compartments by baffles. The rating problem is concerned with the determination of the heat transfer rate, fluid outlet temperature, inlet temperature, heat transfer area and the sizing problem involves determination of the dimension of the heat exchanger. These are calculated using a pressure vessel design code such as the boiler and pressure vessel code from asme american society of mechanical engineers and the british master pressure vessel standard, bs 5500. E1mnl032a design and rating of shell and tube heat. Calculating rate of heat transfer between two working fluids of a heat. Shell and tube heat exchanger design free download for.
Setting shell side and tube side pressure drop design limits. Process fluid assignments to shell side or tube side. The combined effect of all these correction factors for a welldesigned shellandtube heat exchanger is of the order of 0. It is necessary to calculate the heat transfer coefficient and wall resistance. Download helical coil heat exchanger design automatically make thermal design calculations for helical coil heat exchanges, including pressure drops, flow rate and hot. Jm dixon associates ltd undertake the mechanical design of all types of heat exchanger and have designed to most configurations listed in tema. Operating problems aircoolers outlines common operating problems for air cooled heat exchangers ache such as. Most generally, this is done using although in practice it is more common to assume that fluid properties can be treated as constant at the bulk average values, and approximate the design. Shell and tube multipass heat exchanger design tubular. May 03, 2019 shellandtube type heat exchanger having a 0, b 30, and c 60 baffle angles. Shell and tube heat exchangers page 4 of 30 mnl 032a issued 29 august 08, prepared by j.
Lets try to map out a heat exchanger design strategy. 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. Shell and tube multipass heat exchanger design tubular juice heater design calculation with online calculator. Normally, a process design engineer is responsible.
The basic heat exchanger design equation can be used for a variety of types of heat exchangers, like double pipe heat exchangers or shell and tube heat exchangers. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. The mechanical design of a shell and tube heat exchanger provides information on items such as shell thickness, flange thickness, etc. The optimum thermal design of a shell and tube heat exchanger involves the. The most common problems in heat exchanger design are rating and sizing.
Heat exchanger calculations and design with excel spreadsheet. Efforts have been made to confirm the accurracy of all calculations. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. There exists many different tools used to design, size and rate heat exchangers. Upstream of waste heat boilereconomizer design data are as mentioned below. Well do so with a series of questions followed by information to help you answer the questions. Overall the shell and tube practice it is more common to assume that fluid properties can be treated as constant at the bulk average values, and approximate the design equations. In this present work, a shell and tube heat exchanger with a 1shell, 1tube pass and counter current flow designed from kerns method is presented. All trademarks, registered trademarks, product names and company names or logos mentioned herein are the property of their respective owners. The optimum thermal design of a shell and tube heat exchanger involves the consideration of many interacting design parameters which can be summarized as. Shell design pressure 34 bar boiler feed water service moc ss304 tube design pressure 8. Shell and tube heat exchanger step by step calculations.
Shell and tube heat exchanger design is an iterative process, which goes through the following steps. 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. Extension to other exchanger types requires new equations. Shell and tube exchangers an overview sciencedirect topics. How to design a tubular heat exchanger hrs heat exchangers. Shell and tube heat exchangers basic calculations pdh online. Q m h c ph t hin t hout m c c pc t cout t cin, where. Here, we will cite only those that are immediately useful for design in shell and tube heat exchangers with sensible heat transfer on the shell. With the heat exchanger geometry defined, the mechanical design calculations must be performed to ensure that the heat exchanger design is valid for the design pressure and conditions. Tema type e heat exchangers are the basis of many other designs.
The tubes may be permanently positioned inside the shell fixed tube sheet exchanger or may be removable for ease of cleaning and replacement floatinghead or u tube exchanger. They are tube inside liquid media film coefficient, shell side heating media film coefficient and metal wall resistance heat transfer is the science which deals with the rates of exchanges of heat. Assume tube diameter and bwg, assume tube length, l 2. The common focus of the publication is to predict the variation of lmtd, heat transfer coefficient, nusselt number, and pressure drop with a change in values of reynolds number for 0, 30, and 60 baffles situated in the heat exchanger as shown in figure 1.
The basic layout for a countercurrent shell and tube heat exchanger together with the associated heat. Select a suitable type of shell and tube exchanger. Finally, it is shown how to calculate the pressure losses at the tube and shell side and how to design a heat exchanger for a given problem definition easily and quickly with the help of heat exchanger. Not only can it have a direct bearing on the heat transfer efficiency of the heat exchanger, in instances where the incorrect flow rate is used, it is often the cause of premature failure. I am new to this website, i wanted to share a few spreadsheets, dont know whether this where i should share the file or not. Shell and tube heat exchanger design jm dixon associates ltd.
Calculate the required heat transfer area based on values needed. Comparison of different calculation models shows that the deviations in the calculated overall heat transfer coefficients are small. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectivenessnumber of. The choice of shell and tube type is determined chiefly by factors such as the need for the provision for differential movement between shell and tubes, the design pressure, the design temperature, and the fouling nature of the fluids rather than the function. A quick calculation method xltherm is also available to assist this procedure. The two most common heat exchanger design problems are those of rating and sizing. Heat transfer equipment may be designated by type or function it performs, such as chiller, condenser, cooler reboiler, etc. The choice of shell and tube type is determined chiefly by factors such as the need for the provision for differential movement between shell and tubes, the design pressure, the design. Pdf design of shell and tube heat exchanger single. Tema type e heat exchanger design excel calculations. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. The spreadsheet allows you to pick from a triangle, square or rotated square tube placement, and specify the precise geometry of the shell, and then calculates the shell side pressure drop and. Heat exchanger theory and the heat exchanger design. The basic design of shell and tube calculation for any heat exchanger is the determination of heat transfer area.
May 01, 2019 for the first trial calculation, this a is the heat transfer area provided or actual heat transfer area of available or selected heat exchanger. Steam is put in shell side and cool water in tube side. Each of those parameters will be discussed briefly in the next three sections. Exchanger type would you like to change how the exchanger is specified. Fundamental concepts of overall heat transfer coefficient ohtc in shell and tube type heat exchanges overall heat transfer coefficient ohtc is product of the three factors mainly.
How shell and tube heat exchangers work engineering duration. The optimum thermal design of a shell and tube heat exchanger involves the consideration of many interacting design parameters which can be summarised as follows. This spreadsheet calculates the number of tubes needed for a specified tube length and diameter. Define design parameters such as number of tube passes, tube size, shell id etc. Overall heat transfer coefficient for shell and tube heat. Corrected log mean temperature difference for shelland. Pdf design of shell and tube heat exchanger single phase. This figure shows you general stepbystep method of design of shell and tube heat exchanger design of shell and tube heat exchanger. Selection of heat exchanger tema layout and number of passes. Pdhonline course m371 2 pdh shell and tube heat exchangers. This site is not directly affiliated with webbusterz engineering software. Below are some of the tools and information we use on a routine basis. Shell and tube heat exchanger calculations can be done at.
Shell and tube heat exchanger design security and download notice download. Define the duty q from mass flow rate, inlet temperature, outlet temperature, and heat capacity. A list of useful equations for the shell and tube heat exchanger design to calculate overall heat transfer rate, lmtd, heat transfer coefficient etc. The basic design calculation for any heat exchanger is the determination of heat transfer area. The shell and tube heat exchanger is a acceptable from the thermal point of view and one may go on to. The thought process involved is just as important as the calculations involved. No guidance is given on how to generate these equations.
Would you like to change how the exchanger is specified. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectiveness. Shell and tube heat exchanger design linkedin slideshare. The thermal design of a shell and tube exchanger is an iterative process which is normally carried out using computer programs from organizations such as the heat transfer and fluid flow service htfs or heat transfer research incorporated htri. The optimum thermal design of a shell and tube heat exchanger involves the consideration of many interacting design parameters which can be summarized as follows.
Design considerations for shell and tube heat exchangers. To determine these design parameters, a few calculations must be performed for the shell and tube heat exchanger. However, it is important that the engineer understands the logic behind the calculation. One fluid flows inside the tubes is called the tube side fluid, while the other fluid flows across and along the axis of the exchanger in the shell side shell side fluid. The velocity or flow rate of the fluid that circulates through a typical shell and tube heat exchanger is extremely important. Specification of tube parameters size, layout, pitch. Poor choice of tube material could result in a leak through a tube between the shell and tube sides causing fluid crosscontamination and possibly loss of pressure. Shortcut heat exchanger sizing estimates lmtd, exchanger surface area, number of tubes, shell diameter and number of shell in series checalc chemical engineering calculations to assist. Log mean temperature difference lmtd calculation for a shell and tube exchanger for countercurrent, cocurrent flow checalc chemical engineering calculations to assist process. Shell and tube heat exchanger calculations of shell and tube.
The analysis is extended using the above kern method with different fluid. Shell and tube heat exchanger design is a product developed by webbusterz engineering software. We will limit ourselves to the design of recuperators only. Shortcut heat exchanger sizing estimates lmtd, exchanger surface area, number of tubes, shell diameter and number of shell in series checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. The simple design of a shell and tube heat exchanger. The design of shell and tube heat exchanger using kern method for water and steam combination is validated by wellknown dittusboelter equation of turbulent flow inside tube. Simplified heat exchanger design calculations 1 if inlet temperatures, mass flow rates and one of the outlets temperatures are known 1. Heat exchanger theory and the heat exchanger design equation. The excel spreadsheet template at the right is for shell and tube heat exchanger design. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations.
They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger. Design spreadsheet for shell and tube heat exchanger and. The spreadsheet allows you to pick from a triangle, square or rotated square tube placement, and specify the precise geometry of the shell, and then calculates the shell. They offer a single pass, with liquid entry and exist on opposing sides of the shell. It is an outline of the chemical engineering discipline, related principles and calculation methods.
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