The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. For an existing heat exchanger the geometry, flows and. Pdf design of double pipe heat exchanger kirti zare. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias. At the beginning of the calculation must be decided the. Hi, i need to simulate a double pipe hx with hysys. Calculate the required heat transfer area based on values needed. Base your calculation on the outside area of the inside pipe.
The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. Jc equipments pvt ltd used top rated softwares to design and best quality design engineers to design your double pipe heat exchanger. I just need a simple model, that is to said a tube inside the other. This project work is based on design and thermal analysis of double pipe heat exchanger. Is it possible to select a tema configuration in order to make a paralelism. Download the excel spreadsheet templates in this article to make preliminary heat exchanger design calculations. A heat exchanger thermal design calculations spreadsheet. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. We have examined the final copy of this project and in our opinion. Here you will find informational articles on topics related to the excel spreadsheets for civil and mechanical engineering calculations available from the downloads page. The overall heat transfer characteristics of a double pipe heat exchanger.
Heat exchangers heat exchangers are used to transfer heat between two sources. Nowadays, heat exchanger becomes the prominent application for sensible cooling and sensible heating applications. Double pipe heat exchanger posted in chemical process simulation. Heat exchanger design and heat transfer coefficients. 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 shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. 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. The optimum thermal design of a shell and tube heat exchanger involves the. A double pipe heat exchanger fabrication and standardization. Therefore, it can not be classified as a compact heat exchanger. Chemcad is used to establish the steady state mass and energy balances across the heat exchanger and typical values of the ohtc are shown in the attachments. 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. Analysis of double pipe heat exchangers, suggessted order. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. 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. Double pipe heat exchanger chemical process simulation.
Heat exchangers 73 individual thermal resistances of the system. The figure of the mesh of the double pipe heat exchanger with twisted tape is shown. Select run calculation, and set the number of iterations to 650. Double pipe heat exchanger free download as word doc. Pdf on jan 1, 2018, mate petrik and others published optimal design of. Double pipe heat exchangers, also known as double tube, double duct, or tubeintube heat exchangers, are considered one of the devices for passive heat transfer enhancement. 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. The popularity of spiral coil heat exchanger is coming from their wide applications due to usefulness and suitability as they prove to be compact in design, unique in. Flow inside double pipe heat exchangers can be cocurrent or countercurrent. One fluid flows through the inner pipe while the second fluid flows through the annulus between the pipes.
Counter flow heat exchangers are the most efficient of the three types. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. 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 heat exchanger layout depends on the heat transfer area hta so an initial estimate is required based on a trial value of the ohtc.
I tried with the shell and tube hx but this is not what i have to simulate. The author claims no originality but hopes that the format and contents will provide a. The area density for double pipe heat exchanger can not be in the order of 700. In process calculations, the main objectives of heat exchanger calculations are to determine. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water.
A procedures manual was created for the doublepipe heat exchanger. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction. Using this estimate, calculate the heat transfer area. Heat exchangers are used to transfer heat between two sources. Calculate the heat transfer area of the double pipe heat exchanger in the lab. Pdf the double pipe heat exchanger is one heat exchanger pipe inside. Heat exchangers jordan university of science and technology. 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. Double pipe heat exchanger design step by step software. This engineering calculator will determine a number of variables for the most common arrangements or flow paths within heat exchangers. 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. 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. 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. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required.
The last step in the import wizard is to specify the data format of the. This includes articles in the clickable categories below. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. The heat exchange duty a llows calculation of the log mean. Calculates the length of a concentric counterflow heat exchanger using the same parameters as in sizing a heat exchanger. This excel spreadsheet helps you design a double pipe heat exchanger also known as a concentric tube heat exchanger. To understand the basic operation of heat exchangers. Double pipe i regeneraljve classification according to. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat. The image shows only the beginning of the calculations. 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. Design a double pipe heat exchanger with bare inner multitubes. Calculation include pressure losses in pipe and fittings, natural gas pipe sizing, two phase flow, pump sizing and compressor rating.
Heat exchangers are typically classified according to flow arrangement and type of construction. 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. The heat transfer rate, q, for a heat exchanger thermal design calculations spreadsheet. Experimental investigation of doublepipe heat exchangers. Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others.
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. These assumptions also simplify the basic heatexchanger equations. Double pipe heat exchanger, double pipe heat exchanger. A device whose purpose is the transfer of thermal energy between two fluids. They have a particular advantage when close temperature approaches are needed or in high pressure applications.
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. Overall heat transfer coefficient for doublepipe heat. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. The doublepipe heat exchanger is one of the simplest types of heat exchangers. The equations for the analysis of a double pipe heat exchanger are stated and are summarized in the following suggested order. Heat exchanger size is the critical criteria due to availability various heat transfer augmentation techniques. Flow in a doublepipe heat exchanger can be cocurrent or countercurrent.
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. In double pipe exchangers, one fluid flows inside a pipe, and the other fluid flows in the vicinity between the outer pipe and the inner pipe. The heat exchange duty a llows calculation of the log mean temperature. Convective heat transfer from the outer tube wall to the outside fluid. The output results of the experimental performance is calculated by mathematical calculations and the values of the parameters such as effectiveness.
In process calculations, the main objectives of heat exchanger calculations are to determine the heat duty amount of energy to be transferred, temperature changes. Combining each of these resistances in series gives. Handbook, textbook, user guide pdf files on the internet quickly and easily. The double pipe heat exchanger configuration simulated consisted of two concentric pipes. The overall heat transfer characteristics of a double pipe. E1mnl032a design and rating of shell and tube heat. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. A double pipe heat exchanger is constructed of a stainless steel k 15. 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. To demonstrate the basic equations of heat exchanger operation.
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