In the present work, the performance of a double pipe heat exchanger dphe has been evaluated by computational fluid dynamics cfdpackage fluent 14. Calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. Read on for information about the use of an excel spreadsheet for preliminary heat exchanger design calculations. Design of double pipe heat exchanger posted in student. Pdf design of double pipe heat exchanger kirti zare. There are thus three heat transfer operations that need to be described.
The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. The area density for doublepipe heat exchanger can not be in the order of 700. This engineering calculator will determine a number of variables for the most common arrangements or flow paths within heat exchangers. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. 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. Problem statement it is desired to heat 5 kghr of cold benzene from 80 to 120.
Heat exchangers 73 individual thermal resistances of the system. Double pipe heat exchanger design step by step software. 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. A heat exchanger thermal design calculations spreadsheet. Selection of heat exchanger tema layout and number of passes. The most widely used double pipe heat exchanger is the hair pin. 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. Doublepipe heat exchangers, with their typical uturn shape, are one of the simplest and cheapest type of heat exchangers used in the chemical process industry. Calculate the required heat transfer area based on values needed. Double pipe heat exchanger, operations and applications. Heat exchanger and its types engineering solutions. The meanings of the four temperatures in the log mean temperature difference equation are rather self explanatory as shown in the diagram of a counterflow double pipe heat exchanger at the right. The model of ceramic heat exchanger was taken from the reference papers a theoretical analysis and cfd simulation on theceramic monolith heat exchanger.
Double pipe heat exchanger this project work is based on design and thermal analysis of double pipe heat exchanger. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. The overall heat transfer characteristics of a double pipe. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. Heat exchanger design and heat transfer coefficients. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. 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. Chemical engineering calculations to assist process, plant operation and maintenance engineers. Describes how counterflow is different from parallel flow. What are practical applications of double pipe heat. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by literature correlations. 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.
The image shows only the beginning of the calculations. Three partial differential equations describe heat balances across the tube and shellside liquids. Types of heat exchangers the simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in figure 1, called the doublepipe heat exchanger. The overall heat transfer characteristics of a double pipe heat exchanger. Setting upper and lower design limits on tube length. Dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. A device whose purpose is the transfer of thermal energy between two fluids. The 3d model of the ceramic heat exchanger is created using nxcad software from the 2d drawings. The heat exchange duty a llows calculation of the log mean. However, since double pipe heat exchangers are simple, they are used to teach heat exchanger design basics to students as the fundamental rules for all heat exchangers are the same. Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat exchanger. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers.
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. The screenshot below shows a heat exchanger thermal design calculations spreadsheet that can be used to carry out thermal design of a double pipe heat exchanger. Phex is an easy to use tool which demonstrates the thermal calculations of gasketed plate heat exchangers phex is an easy to use tool which demonstrates the thermal calculations of gasketed plate heat exchangers, the plate dimensions and materials can be entered, this includes the size of plate heat exchanger and chevron angle. A double pipe heat exchanger also sometimes referred to as a pipeinpipe exchanger is a type of heat exchanger comprising a tube in tube structure. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias. Double pipe heat exchanger this application models the temperature dynamics of a countercurrent double pipe heat exchanger. Flow in a doublepipe heat exchanger can be cocurrent or countercurrent. Products double pipe heat exchangers heat transfer. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Specification of tube parameters size, layout, pitch and material.
Thermal analysis of double pipe heat exchanger by changing. Double pipe heat exchangers come into their own when. The software will do all the thermal calculations involved in the design and will generate a summary of all resultsetc. Double pipe heat exchanger design free download and. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. We have examined the final copy of this project and in our opinion. 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. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. Therefore, it can not be classified as a compact heat exchanger. Nxcad is the worlds leading 3d product development solution. Heat exchanger formulas software free download heat. Actually, this step is going to determine physical properties and shape of the heat exchanger.
The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Combining each of these resistances in series gives. The heat exchange duty a llows calculation of the log mean temperature difference and that together with the estimated overall heat transfer coefficient allows calculation of the required heat transfer surface area. The page 1 spreadsheet from the second section in this article is included with this page 2 in the spreadsheet templates that can be downloaded below. In process calculations, the main objectives of heat exchanger calculations are to determine the heat duty amount of energy to be transferred, temperature changes.
Why dont we apply 10 th rule for double pipe heat exchanger but for posted in relief devices forum. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Shell and tube heat exchangers consist of series of tubes. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Analysis of double pipe heat exchangers, suggessted order of calculations s. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. One fluid in a doublepipe heat exchanger flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Ntu relationships are given for a simple double pipe heat exchanger for parallel.
Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of. The second type is regenerative type, in which hot and cold fluids are in the same space which contain a matrix of materials which work alternately as source for heat flow. As the name suggests, it consists of two pipes, one within the other. A procedures manual was created for the doublepipe heat exchanger. The heat transfer rate, q, for a heat exchanger thermal design calculations spreadsheet. The software will do all the thermal calculations involved in the design and will generate a summary of. Thermal design during heat exchanger design often overall heat transfer coefficient is used that connects the rate of heat transfer to the temperature difference of the system.
Manifolding of a multiple hairpin setup is easily accommodated. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. One set of these tubes contains the fluid that must be either heated or. In its simplest form, the double pipe heat exchanger, also known as a concentric pipe, hairpin, jacked pipe and jacketed utube heat exchangers, consists of a single tube mounted inside another. Double pipe heat exchanger design dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. Heat exchangers heat exchangers are used to transfer heat between two sources. Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. If you want to obtain an excel spreadsheet for preliminary design of double pipe andor shell and tube heat exchangers, click here to visit our download page. It is called a doublepipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first. Toluene will be cooled from 160 to 100 the specific gravities at 68. Selection of heat transfer models and fouling coefficients for shell side and tube side. Double pipe heat exchanger design software hairpin heat. Double pipe heat exchanger design consists of one pipe placed inside another pipe of a larger diameter with appropriate fittings to guide the flow from section to another.
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