Keywords doublepipe heat exchanger, heat transfer, optimization, comparisons. Process fluid assignments to shell side or tube side. Manifolding of a multiple hairpin setup is easily accommodated. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. What are the typical design codes applicable for mechanical design of double pipe heat exchangers. This engineering calculator will determine a number of variables for the most common arrangements or flow paths within heat exchangers. Presume that the exit temperature of water is not to. The author concluded that the double pipe heat exchanger design would consume a power of 51,000 kwhyear, which is lesser than that consumed by the typical existing system. The pressure of tube is around 150 bar and the pressure of annulus fluid is 10 bar and both in the liquid phase.
One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. The heat exchange duty a llows calculation of the log mean. The overall heat transfer characteristics of a double pipe. Condenser heat exchanger is very common in process industry, condensers may be classified in two main types. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. For lightly higher heat duties, helical coil heat exchanger is used. Actually, this step is going to determine physical properties and shape of the heat exchanger. Optimum design of double pipe heat exchanger sciencedirect. Each of those parameters will be discussed briefly in the next three sections. Pdf on jan 1, 2018, mate petrik and others published optimal design of. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction.
A double pipe heat exchanger will typically be either counterflow or parallel flow. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. Tm is the log mean temperature difference given as t t. Convective heat transfer from the outer tube wall to the outside fluid. A heat exchanger thermal design calculations spreadsheet. 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. Design and experimental analysis of spiral tube heat exchanger 38 fig. The flow pattern and the required heat exchange duty allows calculation of the log mean. In double pipe heat exchanger design, an important factor is the type of flow pattern in the heat exchanger. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Aug 10, 2011 a heat exchanger thermal design calculations spreadsheet.
Calculation include pressure losses in pipe and fittings, natural gas pipe sizing, two phase flow, pump sizing and compressor rating. Jc equipments pvt ltd used top rated softwares to design and best quality design engineers to design your double pipe heat exchanger. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. 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. Fired heaters the selection of a heat exchanger depends on many factors including capital and. Double pipe heat exchanger, double pipe heat exchanger. Calculate the required heat transfer area based on values needed. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. 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 as pdf file. It is called a double pipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and another pipe that surrounds the first.
Experimental investigation of doublepipe heat exchangers. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions in a concentric tube or double pipe construction. In the attachments a design aid is presented which includes key information for data entry and a shortcut calculation method in excel to allow an independent check to be made on the results from software calculations. Hi i wish to design a double pipe heat jacketed heat exchanger by using htri. Double pipe heat exchanger design with counterflow or. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. Mechanical design is done only for heat exchanger 1 since it is has the largest heat load and is difficult to design it heat exchanger 1 than the heat exchanger 2. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. Hisaka websimulator hws plate heat exchanger this is the. 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. 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. Access the url below and click on the websimulator icon.
Overall heat transfer coefficient for doublepipe heat. 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. Dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. Combining each of these resistances in series gives.
Thermal analysis of double pipe heat exchanger by changing. 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. The double pipe heat exchanger is one of the simplest types of heat exchangers. Double pipe heat exchangers are used for low product streams and low heat duties. Select run calculation, and set the number of iterations to 650. A device whose purpose is the transfer of thermal energy between two fluids.
Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. The software will do all the thermal calculations involved in the design and will generate a. Crossflow just doesnt work for a double pipe heat exchanger. Mechanical design is done only for heat exchanger 1 since it is has the largest heat load and is difficult to design it heat exchanger 1 than the heat exchanger.
In a heat exchanger the logmean temperature difference is the appropriate. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. The inner pipe is a suction pipe of the pump in which hot hydrocarbon flows and in outer annulus cold crude oil passes from opposite direction. Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. Pdhonline course m371 2 pdh shell and tube heat exchangers. Problem statement it is desired to heat 5 kghr of cold benzene from 80 to 120.
So now if we go into the design part of it, we will find that this exchanger can also be. Toluene will be cooled from 160 to 100 the specific gravities at 68. For example, in a shell and tube exchanger, the pipe diameter and length are used for this purpose. Design of double pipe heat exchanger student cheresources. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. The overall heat transfer coefficient of the exchanger is. Condensers which have a coolant and a condensing vapor brought into direct contact and other types which have the coolant and a condensate stream separated by a tube wall or a solid surface. Mar, 20 calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. 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. Yau developed an empirical model for the hvac system of an operating theatre to test the design of a double pipe heat exchanger in the air handler unit. Heat exchangers 73 individual thermal resistances of the system. One set of these tubes contains the fluid that must be either heated or. Double pipe heat exchanger design step by step software. Condenser heat exchanger thermal analysis and design.
This project work is based on design and thermal analysis of. 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. So, already we have talked about the double pipe heat exchanger in one of. The most widely used double pipe heat exchanger is the hair pin. Chemical engineering calculations to assist process, plant operation and maintenance engineers.
The area density for double pipe heat exchanger can not be in the order of 700. Nov 22, 2012 design of double pipe heat exchanger posted in chemical process simulation. Heat exchangers are typically classified according to flow arrangement and type of construction. Double pipe heat exchanger design software hairpin heat. Shell and tube heat exchanger design software for thermal. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat exchanger are available, using these equations the optimization of the system cost is laborious. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. Therefore, it can not be classified as a compact heat exchanger. Double pipe heat exchanger design free download and. Double pipe heat exchanger design heat exchanger viscosity.
The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Heat exchanger and its types engineering solutions. How to build a hinged hoophouse for a raised bed garden duration. Make an initial estimate of the overall heat transfer coefficient, u, based on the fluids involved. Design of doublepipe heat exchanger chemical process. The calculation of the heat transfer coefficients is explained with examples. In addition to affecting flow, the geometry of the exchanger is necessary to calculate the heat transfer area. This article shows how to do design for double pipe heat exchanger and estimate length of double pipe required. 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. Input and output temperatures of annulus and pipe are known. Apr 25, 2020 double pipe exchanger with finned pipe surface.
Design and rating of shell and tube heat exchangers page 4 of 30 mnl 032a issued 29 august 08, prepared by j. At the beginning of the calculation must be decided the flow paths. Calculate logarithmic mean temperature difference lmtd lmtd. Design of double pipe heat exchanger posted in student. Heat exchanger 1 lmtd method heat transfer log mean temperature difference lmtd method the rate of heat transfer is a heat exchanger can be expressed as q ua. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. They have a particular advantage when close temperature approaches are needed or in high pressure applications. At the beginning of the calculation must be decided the. The design provides the flexibility of a utube design with an extended shell length that improves the exchanger s ability to achieve close temperature approaches. 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. Heat transferheat exchangers blogs engineering excel templates. E1mnl032a design and rating of shell and tube heat. Pdf design of double pipe heat exchanger kirti zare.
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. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. The area is calculated based on specifications of the dimensions of process streams contact area. Design a double pipe heat exchanger with bare inner multitubes that. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Double pipe heat exchager design code heat transfer. In an excel spreadsheet for thermal design of a double pipe heat exchanger, the heat exchanger equation can be used to calculate the required heat exchanger area for known or estimated values of the other three parameters, q, u, and. Dec 21, 2014 in an excel spreadsheet for thermal design of a double pipe heat exchanger, the heat exchanger equation can be used to calculate the required heat exchanger area for known or estimated values of the other three parameters, q, u, and. Products double pipe heat exchangers heat transfer. First heat exchanger is designed using sa179 carbon steel finned tubes and the second heat exchanger is designed using sa179 carbon steel tubes.
Counter flow heat exchangers are the most efficient of the three types. Heat exchangers are used in industrial processes to recover heat between two process fluids. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. So, let us try to calculate the flow rate of the hot fluid and this can be done by. If the overall heat transfer coefficient is expected to be 1. This software deals with the type where the streams are separated when condensation occurs. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Make an initial estimate of the overall heat transfer coefficient, u, based on. Setting shell side and tube side pressure drop design limits.
Calculate logarthmic mean temperature difference lmtd. The entire analysis has been done by selecting an existing design of a double pipe heat exchanger with specified flow conditions at the inlet to the heat exchanger. This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. How to model a double pipe heat exchanger2 youtube. Heat exchanger calculations and design with excel spreadsheet. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. Shell and tube heat exchangers consist of series of tubes. 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.
We are using most excellent softwares for support of complicated calculations while design of double pipe heat exchanger. A double pipe heat exchanger is a piece of jacketed pipe, designed and fabricated in accordance with the. 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. The hairpin heat exchanger design is similar to that of double pipe heat exchangers with multiple tubes inside one shell. It is shown how the heat transfer coefficients and the pressure losses are calculated. The gardening channel with james prigioni recommended for you. The overall heat transfer characteristics of a double pipe heat exchanger.
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