Base your calculation on the outside area of the inside pipe. Common types of heat exchangers used in this application are the double pipe heat exchanger as well as the plate and frame heat exchanger. Effect of pressure hot on temperature profile and fluid properties along length of doublepipe hx. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. 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. Double pipe heat exchanger design with counterflow or. In aircraft edit in commercial aircraft heat exchangers are used to take heat from the engines oil system to heat cold fuel. Flow in a doublepipe heat exchanger can be cocurrent or.
Pdf on jan 1, 2018, mate petrik and others published optimal design of doublepipe heat exchangers find, read and cite all the research you need on. 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. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow. Double pipe heat exchangers have a simple construction.
Double pipe heat exchangers are the simplest recuperators in which heat is transferred from the hot fluid to the cold fluid through a separating cylindrical wall. Type part of your institution name for a list of matches. Heat pumps explained how heat pumps work hvac duration. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Equations for the mean temperature difference for units with flow in series parallel are also given. Calculate the heat transfer area of the double pipe heat exchanger in the lab. Ntu relationships are given for a simple double pipe heat.
A heat exchanger is a system used to transfer heat between two or more fluids. Introduction to heat exchangers bengt sunden lund institute of technology. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes platefin tubefin ordinary separating wall heatpipe wall rotary fixedmatrix rotating hoods. Typically double pipe heat exchangers are designed to provide counter current flow and they are used for low heat duties. Flow in a double pipe heat exchanger can be cocurrent or. Heat exchangers are typically classified according to flow arrangement and type of construction. Double pipe heat exchanger, double pipe heat exchanger. 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 22, 23, 24. Longer contact time and higher heat exchange surface area allows greater heat tran. Jun 08, 2016 how shell and tube heat exchangers work engineering duration.
Convective heat transfer from the outer tube wall to the outside fluid. Jan 23, 20 double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Heat exchangers are devices that exchange the heat between two fluids. If you no longer have access with this institution, try logging in with your acs id.
Diagram of a single node for a doublepipe heat exchanger. Retain extra sig figs since this is an intermediate calculation. As per the design of all shell and tube heat exchangers, one fluid. Double pipe heat exchangers are normally designed in a hairpin shape and are fabricated in accordance with asme code. It consists of concentric pipes separated by mechanical closures. The wall of the inner pipe is the heat transfer surface. In doublepipe exchangers, one fluid flows inside a pipe, and the other fluid flows in the vicinity between the. Combining each of these resistances in series gives. This project work is based on design and thermal analysis of double pipe heat exchanger. There are many types of heat exchangers applied in the process industry. As the oils flow through the system, the material properties of both change with.
Double pipe heat exchanger with circular fins double pipe heat exchanger with circular fins the circular fins are mounted on the outer surface of inner pipe and concentric with inner pipe and outer pipe shows a circular fins with 9. Three partial differential equations describe heat balances across the tube and shellside liquids, and a heat balance across the tubewall taking into account the heat flow from the shell and. Overall heat transfer coefficient for doublepipe heat. Overall heat transfer coefficient for doublepipe heat exchanger. Double pipe heat exchangers, heat transfer enhancement, ribbing. 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.
To understand the basic operation of heat exchangers. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Heat exchangers doehdbk1018193 types of heat exchangers. Experimental investigation of doublepipe heat exchangers. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
This example studies the cooling of hot oil c by a cool oil 60c entering in countercurrent. Double pipe heat exchanger manufacturers india heat. Double pipe heat exchangers heat transfer applications. Double pipe heat exchanger calculation does the thermal and hydraulic design of double pipe heat exchangers and estimate number of hairpin required. The heat exchange duty a llows calculation of the log mean. Inexpensive, rugged and easily maintained, they are primarily adapted to hightemperature, highpressure applications. Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. Which is more efficient, shell and tube heat exchangers or. If your institution is not listed, please contact your librarian. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117.
Doublepipe heat exchangers, also known as doubletube, doubleduct, or tubeintube heat exchangers, are considered one of the devices for passive heat transfer enhancement. Using nanofluids in double pipe heat exchangers has presented higher heat transfer rates. These types of heat exchangers found their applications in heat recovery 2. Double pipe heat exchanger ce 328 spring 2003 objective. Klm technology group process design of double pipe. 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.
It can be operated as a parallel flow or as a counterflow heat exchanger. The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products. A double pipe heat exchanger like shell and tube heat exchangers. Introduction a heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between. Heat exchangers are used in both cooling and heating processes.
Doublepipe heat exchanger introduction this application models the temperature dynamics of a countercurrent double pipe heat exchanger. 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 doublepipe construction. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow. Doublepipe heat exchangers use a single pipe within a pipe design and are commonly used for high fouling services such as slurries applications. The amount of heat transfer per section is small, that makes the double pipe heat exchangers a suitable heat transfer device in. The principal parts are two sets of concentric pipes, two connecting tees, and a return head and a return bend as shown in fig.
All about double pipe heat exchangers what you need to know. Heat exchangers 73 individual thermal resistances of the system. Heat exchangers may be classified according to transfer process, construction, flow arrange ment, surface compactness, number of fluids and heat transfer mechanisms as shown in fig. Classification according to flow arrangements singlepass multipass counter flow parallel. Doublepipe and multitube heat exchangers with plain and. Fired heaters the selection of a heat exchanger depends on many factors including capital and. We using latest raw material in the making development of double pipe heat exchangers. A double pipe heat exchanger, in its simplest form is just one pipe inside another larger pipe. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat. How shell and tube heat exchangers work engineering duration. Pdf design of double pipe heat exchanger kirti zare.
We are members of htri and utilize htri thermal design software, and codecalc for mechanical design to asme code with s, u and r stamps. 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 horizontal double pipe heat exchanger is made from galvanised iron tube. Checalc chemical engineering calculations to assist process, plant operation and maintenance engineers. The double pipe heat exchanger is one of the simplest types of heat exchangers. These styles of double pipe may have a bundle of inner tubes rather than a single tube and the limits on these styles are the number of tubes less than 30 tubes and the diameter of the outer pipetube is less than 200 mm. Double pipe heat exchangers are also known as hairpin, jacketed pipe, jacketed utube and concentric pipe. Experimental investigation of doublepipe heat exchangers in. This type of heat exchangers are mostly used in the fields of thermal power station, petroleum and heat industry. Double pipe heat exchanger design requires use of the heat transfer rate, the log mean temperature difference, and an estimate of the overall heat transfer coefficient to calculate the estimated heat transfer surface area. Alloy engineering thermally and mechanically designs custom asme heat exchangers. Design and optimization of massproduced heat exchangers, e. How to model a double pipe heat exchanger2 duration. Double pipe heat exchanger design free download and.
We provide high and international quality standards double pipe heating system. Chapter 5 heat exchangers faculty of engineering and. To demonstrate the basic equations of heat exchanger operation. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. Click here to get a preliminary idea about shell and tube heat exchangers. May 05, 2020 these styles of double pipe may have a bundle of inner tubes rather than a single tube and the limits on these styles are the number of tubes less than 30 tubes and the diameter of the outer pipe tube is less than 200 mm. Heat exchangers are used to transfer heat from one fluid to another. The overall heat transfer characteristics of a double pipe. Double pipe heat exchangers applications of double pipe. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural.
The process on demanding a double pipe heat exchangers appplications are. Heat exchangers are a device that exchange the heat between two fluids of different temperatures that are separated by a solid wall. Heat exchangers are devices used to transfer heat between two or more fluid streams. Double pipe heat exchangers use a single pipe within a pipe design and are commonly used for high fouling services such as slurries applications. 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.
A shell and tube heat exchanger is more efficient as it can have multiple passes for the fluid to stay longer in contact with heating material fluid in this case. Double pipe heat exchanger design free to try webbusterz engineering software windows 98me2000xpvista7 version 2. 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. Abstract growing need to develop and improve the effectiveness of heat exchangers has led to a broad range of investigations for increasing heat transfer rate along with decreasing the size and cost of the industrial apparatus accordingly. Calculate the rotameter setting for the desired waterside flow rate. One fluid flows through the inside pipe and the other flows through the annulus between the two pipes. The double pipe heat exchanger is a small, modular design that is most useful in applications where conventional shell and tube exchangers are too large or too expensive to use. A double pipe heat exchanger consists of one pipe inside another. Understanding heat exchangers types, designs, applications. Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube.
In almost any nuclear, chemical, or mechanical system, heat must be transferred from one place to another or from one fluid to another. Theses fins are arranged in such a manner so that they can work as a baffle plate which helps in. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. Applications of heat exchangers present two distinct categories of design problems sarkomaa 1994. Heat exchangers are used in industrial processes to recover heat between two process fluids. Design and optimization of heat exchangers manufactured as oneoff, or at. Double pipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes platefin tubefin ordinary separating wall heat pipe. They are fairly cheap, but the amount of space they occupy is generally high compared with the other types. 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. Double pipe heat exchangers are used only in the chemical, food processing and oil and gas industries. 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.
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