Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Heat transferheat exchangers blogs engineering excel templates. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. Problem statement it is desired to heat 5 kghr of cold benzene from 80 to 120. Design of double pipe heat exchanger posted in student. 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 software will do all the thermal calculations involved in the design and will generate a summary of all results.
In addition to affecting flow, the geometry of the exchanger is necessary to calculate the heat transfer area. Double pipe heat exchangers are used for low product streams and low heat duties. E1mnl032a design and rating of shell and tube heat. Double pipe heat exchanger, double pipe heat exchanger. 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. Double pipe heat exchanger design with counterflow or. The double pipe heat exchanger is one of the simplest types of heat exchangers. 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. 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.
You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. Thermal analysis of double pipe heat exchanger by changing. Select run calculation, and set the number of iterations to 650. A device whose purpose is the transfer of thermal energy between two fluids. Optimum design of double pipe heat exchanger sciencedirect. A heat exchanger thermal design calculations spreadsheet. The software will do all the thermal calculations involved in the design and will generate a.
The heat exchange duty a llows calculation of the log mean. This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. Experimental investigation of doublepipe heat exchangers. Design and experimental analysis of spiral tube heat exchanger 38 fig. Design a double pipe heat exchanger with bare inner multitubes that. How to model a double pipe heat exchanger2 youtube. In double pipe heat exchanger design, an important factor is the type of flow pattern in the heat exchanger. Input and output temperatures of annulus and pipe are known. Double pipe heat exchanger design heat exchanger viscosity.
The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. Make an initial estimate of the overall heat transfer coefficient, u, based on. Keywords doublepipe heat exchanger, heat transfer, optimization, comparisons. Combining each of these resistances in series gives. Calculate the required heat transfer area based on values needed. Presume that the exit temperature of water is not to. The hairpin heat exchanger design is similar to that of double pipe heat exchangers with multiple tubes inside one shell. Each of those parameters will be discussed briefly in the next three sections. At the beginning of the calculation must be decided the flow paths. Heat exchangers are typically classified according to flow arrangement and type of construction. 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.
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. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. In a heat exchanger the logmean temperature difference is the appropriate. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. Actually, this step is going to determine physical properties and shape of the heat exchanger. The heat recovery from hot fluid is used to increase the temperature of cold fluid. The image shows only the beginning of the calculations.
The overall heat transfer characteristics of a double pipe. This article shows how to do design for double pipe heat exchanger and estimate length of double pipe required. A double pipe heat exchanger will typically be either counterflow or parallel flow. Hi i wish to design a double pipe heat jacketed heat exchanger by using htri.
Jc equipments pvt ltd used top rated softwares to design and best quality design engineers to design your double pipe heat exchanger. 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. Overall heat transfer coefficient for doublepipe 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. So, let us try to calculate the flow rate of the hot fluid and this can be done by. Pdhonline course m371 2 pdh shell and tube heat exchangers. The software will do all the thermal calculations involved in the design and will generate a summary of all resultsetc. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction.
Pdf on jan 1, 2018, mate petrik and others published optimal design of. Therefore, it can not be classified as a compact heat exchanger. Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. 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. The gardening channel with james prigioni recommended for you.
The area density for double pipe heat exchanger can not be in the order of 700. Mar, 20 calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. This project work is based on design and thermal analysis of. 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. Chemical engineering calculations to assist process, plant operation and maintenance engineers. Make an initial estimate of the overall heat transfer coefficient, u, based on the fluids involved. The pressure of tube is around 150 bar and the pressure of annulus fluid is 10 bar and both in the liquid phase. Aug 10, 2011 a heat exchanger thermal design calculations spreadsheet. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. How to build a hinged hoophouse for a raised bed garden duration. Calculate logarithmic mean temperature difference lmtd lmtd. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117.
Tm is the log mean temperature difference given as t t. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. Condenser heat exchanger is very common in process industry, condensers may be classified in two main types. Design of double pipe heat exchanger student cheresources. Design of doublepipe heat exchanger chemical process. Pdf design of double pipe heat exchanger kirti zare.
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. The flow pattern and the required heat exchange duty allows calculation of the log mean. Process fluid assignments to shell side or tube side. Access the url below and click on the websimulator icon. 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. 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. 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. At the beginning of the calculation must be decided the. We are using most excellent softwares for support of complicated calculations while design of double pipe heat exchanger.
Double pipe heat exchanger design free download as pdf file. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. So now if we go into the design part of it, we will find that this exchanger can also be. The most widely used double pipe heat exchanger is the hair pin. Calculate logarthmic mean temperature difference lmtd. Shell and tube heat exchanger design software for thermal. The two most common heat exchanger design problems are those of rating and sizing. Double pipe heat exchanger design free download and. The area is calculated based on specifications of the dimensions of process streams contact area. Heat exchanger and its types engineering solutions. 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. 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.
Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. This engineering calculator will determine a number of variables for the most common arrangements or flow paths within heat exchangers. Convective heat transfer from the outer tube wall to the outside fluid. Design and rating of shell and tube heat exchangers page 4 of 30 mnl 032a issued 29 august 08, prepared by j. If the overall heat transfer coefficient is expected to be 1. It is shown how the heat transfer coefficients and the pressure losses are calculated. 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.
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. 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. Calculation include pressure losses in pipe and fittings, natural gas pipe sizing, two phase flow, pump sizing and compressor rating. Double pipe heat exchanger design software hairpin heat. 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. 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. Heat exchangers 73 individual thermal resistances of the system. Products double pipe heat exchangers 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.
Dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. The overall heat transfer coefficient of the exchanger is. Manifolding of a multiple hairpin setup is easily accommodated. Double pipe heat exchanger design step by step software. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. Apr 25, 2020 double pipe exchanger with finned pipe surface. Nov 22, 2012 design of double pipe heat exchanger posted in chemical process simulation. For example, in a shell and tube exchanger, the pipe diameter and length are used for this purpose. Counter flow heat exchangers are the most efficient of the three types. 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. The doublepipe heat exchanger is one of the simplest types of heat exchangers.
Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. The calculation of the heat transfer coefficients is explained with examples. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. Condenser heat exchanger thermal analysis and design. 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. 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.
Crossflow just doesnt work for a double pipe heat exchanger. Double pipe heat exchager design code heat transfer. Hisaka websimulator hws plate heat exchanger this is the. What are the typical design codes applicable for mechanical design of double pipe heat exchangers. 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 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. 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. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. One set of these tubes contains the fluid that must be either heated or. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. The overall heat transfer characteristics of a double pipe heat exchanger.
1076 253 965 693 226 488 875 1650 373 1440 895 1358 1111 370 398 593 1143 1367 1188 1367 515 852 1550 739 495 386 492 758 281 481 249 604 646 553 323 189 611