With convection, as heat is transferred through the pipe wall it is mixed into the stream and the flow of the stream. Double pipe heat exchanger, operations and applications. Double pipe heat exchanger design with counterflow or. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. This project work is based on design and thermal analysis of double pipe heat. The software will do all the thermal calculations involved in the design and will generate a summary of all results, list of main functions. Calculate the heat transfer area of the double pipe heat exchanger in the lab. Heat exchangers are used in industrial processes to recover heat between two process fluids. The heat exchanger area is minimized and the thermofluid dynamic conditions are considered for the use of the right transport correlations, together with design specifications, such as, maximum pressure drops and minimum excess area. A double pipe heat exchanger is a piece of jacketed pipe, designed and fabricated in accordance with the. At the beginning of the calculation must be decided the.
This system was specifically designed for boiler chimney and therefore the systems. A procedures manual was created for the doublepipe heat exchanger. Double pipe heat exchanger, double pipe heat exchanger. Dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. Design a double pipe heat exchanger with bare inner multitubes that. The double pipe heat exchanger is one of the simplest types of heat exchangers. Pdf the double pipe heat exchanger is one heat exchanger pipe inside another. The area density for double pipe heat exchanger can not be in the order of 700. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. Double pipe heat exchanger ce 328 spring 2003 objective. 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. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. The doublepipe heat exchanger is one of the simplest types of heat exchangers.
Double pipe heat exchager design code heat transfer. Three parallel x two series hairpin heat exchangers are used. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. For this research, the small heat exchanger of double pipe type is constructed which wants to make it practicality in daily life such in cooling the hot air from engine bay into intake manifold of car 7. The software will do all the thermal calculations involved in the design and will generate a summary of all results. 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.
What are the typical design codes applicable for mechanical design of double pipe heat exchangers. The last step in the import wizard is to specify the data format of the. In process calculations, the main objectives of heat exchanger calculations are to determine the heat. Retain extra sig figs since this is an intermediate calculation. Chapter 52 heat exchangers, vaporizers, condensers joseph w. How to build a hinged hoophouse for a raised bed garden duration. The overall heat transfer characteristics of a double pipe heat exchanger. For this research, the hot air from engine bay is cooling down by using. Design of double pipe heat exchanger posted in student.
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. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. The overall heat transfer coefficient of the exchanger is. Pdf on jan 1, 2018, mate petrik and others published optimal design of doublepipe heat exchangers find, read and cite. Double pipe heat exchanger design free download as pdf file. Manifolding of a multiple hairpin setup is easily accommodated. 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. We are using most excellent softwares for support of complicated calculations while design of double pipe heat exchanger. Pdf on jan 1, 2018, mate petrik and others published optimal design of doublepipe heat exchangers find, read and cite all the. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction. Design and fabrication of automotive triple tube heat exchanger with guided sinusoidal motion arun subramanian s. Tm is the log mean temperature difference given as t t.
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. May 04, 2009 heat exchanger 2 lmtd method counter flow heat exchanger multipass and cross flow heat exchangers in these heat exchangers, the correction factor is used where the log mean temperature difference is expressed as. This paper investigates the design optimization of double pipe heat exchanger using mathematical programming. The hairpin heat exchanger design is similar to that of double pipe heat exchangers with multiple tubes inside one shell. Double pipe heat exchanger design software hairpin heat. The area is calculated based on specifications of the dimensions of process streams contact area. The image shows only the beginning of the calculations.
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. Heat exchangers are devices used to transfer heat between two or more. Convective heat transfer from the outer tube wall to the outside fluid. This is the reason double pipe heat exchangers are found in many small industries.
An initial design of chimney heat recovery heat exchanger was provided. 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. Calculate the required heat transfer area based on values needed. Double pipe heat exchanger design step by step software. Calculation include pressure losses in pipe and fittings, natural gas pipe sizing, two phase flow, pump sizing and compressor rating. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. Unlike other tools, ensures that the calculations are performed step by step to help in understanding the design calculations. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another. Process fluid assignments to shell side or tube side.
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. 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. In this double pipe heat exchanger a hot process fluid flowing through the inner pipe transfers its heat to cooling water flowing in the outer pipe. 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. Heat exchangers are typically classified according to flow arrangement and type of construction. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Condenser heat exchanger thermal analysis and design. As per the design of all shell and tube heat exchangers, one fluid. In addition to affecting flow, the geometry of the exchanger is necessary to calculate the heat transfer area. 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. That is, it will give the highest overall heat transfer coefficient for the double pipe heat exchanger design. 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. The engine oil is selected to flow inside the tubes.
Design of double pipe heat exchanger student cheresources. 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. First heat exchanger is designed using sa179 carbon steel finned tubes and the second heat exchanger is designed using sa179 carbon steel tubes. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. A form of shell and tube heat exchanger, double pipe heat exchangers employ the simplest heat exchanger design and configuration which consists of two or more concentric, cylindrical pipes or tubes one larger tube and one or more smaller tubes. In heat exchanger, forced convection allows for the transfer of heat of one moving stream to another moving stream. They have a particular advantage when close temperature approaches are needed or in high pressure applications. Make an initial estimate of the overall heat transfer coefficient, u, based on. Pdf design of double pipe heat exchanger kirti zare. 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. 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.
Optimal design of double pipe heat exchanger structures. A primary advantage of a hairpin or double pipe heat exchanger is that it can be operated in a true counterflow pattern, which is the most efficient flow pattern. Aug 10, 2011 a heat exchanger thermal design calculations spreadsheet. Overall heat transfer coefficient for doublepipe heat. Setting shell side and tube side pressure drop design limits. Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a u shaped appearance to the heat exchanger.
The design had a completely fabricated exchange core but an incomplete ducting system. 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. Double pipe heat exchanger design heat exchanger viscosity. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. This report is based on the work undertaken to complete and test the gas to gas heat recovery system. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. The design provides the flexibility of a utube design with an extended shell length that improves the exchanger s ability to. Dear all, for some time, i have been sizing all the process equipments used in gdu. Optimum design of double pipe heat exchanger sciencedirect. Heat exchangers jordan university of science and technology. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 20 41.
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. In intercoolers, boilers, preheaters and condensers inside power plants as well as other engineering pro cesses, heat exchangers are utilized for controlling heat energy. Background a heat exchanger is a heat transfer device whose purpose is the transfer of energy from one moving fluid stream to another moving fluid stream. If somebody can recommend me some very good books or articles on double pipe heat exchanger, i would be very thankful. 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. How to model a double pipe heat exchanger2 youtube.
Jc equipments pvt ltd used top rated softwares to design and best quality design engineers to design your double pipe heat exchanger. 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. Each of those parameters will be discussed briefly in the next three sections. Single inner pipe formed into a removable u or element, with either longitudinal fins or centralizing supports. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. The heat exchange duty a llows calculation of the log mean. Problem statement it is desired to heat 5 kghr of cold benzene from 80 to 120. Experimental investigation of doublepipe heat exchangers in. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. The double pipe exchanger is a well known type of heat exchanger. For example, in a shell and tube exchanger, the pipe diameter and length are used for this purpose.
Therefore, it can not be classified as a compact heat exchanger. This engineering calculator will determine a number of variables for the most common arrangements or flow paths within heat exchangers. To understand the basic operation of heat exchangers. Base your calculation on the outside area of the inside pipe. Compare the calculated overall heat transfer coefficient you obtained from the previous step with that you assumed in step 8.
Double pipe heat exchanger design free download and. In this paper the optimal design of the exchanger has been formulated as a geometric programming with a single degree of difficulty. 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 gardening channel with james prigioni recommended for you. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. A device whose purpose is the transfer of thermal energy between two fluids. To make this small double pipe heat exchanger type become practicality. Fired heaters the selection of a heat exchanger depends on many factors including capital and. The content is presented the heat exchanger design procedure using the. This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. 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. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow.
Toluene will be cooled from 160 to 100 the specific gravities at 68. The most widely used double pipe heat exchanger is the hair pin. Calculate the rotameter setting for the desired waterside flow rate. Select run calculation, and set the number of iterations to 650. Double pipe heat exchanger pipe in pipe heat exchanger. Files available from the acs website may be downloaded for personal use only. Design and fabrication of automotive triple tube heat. A double pipe heat exchanger fabrication and standardization. A heat exchanger thermal design calculations spreadsheet. Tlm,cf is the log mean temperature difference for a counter flow heat exchanger.
Typical standard sizes, layout and overall dimensions are shown. Calculate logarthmic mean temperature difference lmtd. 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. Hence, heat exchangers are very important in factories. 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. These heat exchangers are cheap and easy to maintain. Common design consists of tow fluids separated by a conducting medium. Apr 20, 20 designing heat exchangers double pipe posted in student. Products double pipe heat exchangers heat transfer. Shell and tube heat exchanger design software for thermal. The overall heat transfer characteristics of a double pipe.
Heat exchanger calculations and design with excel spreadsheet. However, in a heat pipe heat exchanger, the heat pipe not only acts as a separating. 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. Equations for calculating the overall heat transfer coefficient for a double pipe heat exchanger with no phase changes. Double pipe heat exchanger design dhex step by step. In addition, we will examine various aspects of heat exchanger design and analysis.
This project work is based on design and thermal analysis of double pipe heat exchanger. Viscosity is calculated for both streams at wall temperature and heat. To demonstrate the basic equations of heat exchanger operation. Counter flow heat exchangers are the most efficient of the three types. Dec 05, 2017 3 year timelapse an off grid homestead from start to finish debt free duration. In the present study, heat transfer from hot water to cold water by double pipe heat exchanger consists concentric tube is experimentally investigated. Make an initial estimate of the overall heat transfer coefficient, u, based on the fluids involved. Understanding heat exchangers types, designs, applications. This paper investigates the design optimization of double pipe heat.
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