One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Fin construction details section of a double pipe heat exchanger. Other approaches to control fouling control combine the blind application of. 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. A wide variety of double pipe heat exchanger options are available to you, such as ccc, ce, and ul. Experiment regarding heat exchanger concurrentcountercurrent flows at same rate and different rates. The design of double pipe heat exchanger for the laboratory used is aim to carry out the design of heat exchanger. Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations.
The total heat transfer area to be provided is around 6. Experimental investigation of doublepipe heat exchangers in. One pipe is for hot fluid and another is for cold fluid. In the analysis of heat exchangers, it is convenient to combine all the ther. Double pipe heat exchanger, operations and applications. Double pipe heat exchanger modeling comsol uses in undergraduate education louis desgrosseilliers and dominic groulx mechanical engineering department, dalhousie university corresponding author. Two types of flow arrangement are possible in a double pipe heat exchanger. Pdf convection heat transfer can be enhanced by imposed turbulence in. Effect of pressure hot on heat transfersurface area of hx.
An experimental setup is designed and constructed to study the heat transfer coefficient of the double pipe heat exchangers in this paper. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Compound technique is one which has the merger of both active and passive method with the. The basis of the laboratory experiment is that a steady state. Our general strategy is to combine experimental investigations of global parameters like. 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 thermal energy between two fluids. In parallel flow, both the hot and cold fluids enter the heat exchanger at the same end and move in the same direction, as shown in figure 1.
Which is more efficient, shell and tube heat exchangers or. The notes are intended to describe the three types of heat transfer and provide. Heat exchangers are used in both cooling and heating processes. 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. 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. One fluid in a doublepipe heat exchanger flows through the smaller pipe. To demonstrate the basic equations of heat exchanger operation.
The student will also learn about the different transducers used to detect and measure the physical properties used when calculating the heat transfer between the hot and cold media in the heat exchanger. Experimental investigation of doublepipe heat exchangers. Combining each of these resistances in series gives. Double pipe heat exchanger ce 328 spring 2003 objective. The overall heat transfer characteristics of a double pipe heat exchanger.
Products double pipe heat exchangers heat transfer. 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. This project work is based on design and thermal analysis of double pipe heat exchanger. 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. Dec 05, 2017 plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Pdf experimental and exergy analysis of a double pipe. Experimental studies of a doublepipe helical heat exchanger article in experimental thermal and fluid science exp therm fluid sci 298. The test section is a counter current double pipe heat exchanger with the length of 120 cm. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. 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 on heat transfer coefficient for.
Alibaba manufacturer directory suppliers, manufacturers. The outer diameter of the heat exchanger is around 1. Thermal conductivity, stefan boltzmann law, heat transfer, conduction, convecton, radiation, physics duration. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid. To determine the overall heat transfer coefficient for the double pipe heat exchanger for countercurrent flow and parallel or cocurrent flow.
The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products. Pdf numerical investigation of thermohydraulic performance of air. A ht30xc heat exchanger unit and ht31 tubular tubeintube heat exchanger are used for this laboratory. Solution during an experiment involving an automotive radiator, the inlet and exit.
Radiation does not play a significant role in the heat transfer in heat exchanger and hence it is neglected. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Pdf in this work, the thermohydraulic performance of a proposed design of an airtowater double pipe heat exchanger with helical fins on the annulus. The simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in fig. 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. The main types of heat exchanger depending upon the type of flow are as follows. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes.
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. The double pipe heat exchanger is one of the different types of heat exchangers. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Double pipe vs shell and tubes double pipe heat exchanger consists of two concentric pipes of different diameters. A double pipe, countercurrent, singlephase heat exchanger with. 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. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. The nanofluids consist of al 2 o 3 and tio 2 nanoparticles, which were added to the base fluid deionized.
Optimum design of double pipe heat exchanger sciencedirect. To understand the basic operation of heat exchangers. Pdf experimental investigation of double pipe heat. 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. A piece of equipment built for efficient heat transfer from one medium to another. 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 apparatus consists of a test section heat exchanger, two tanks, two magnetic gear pumps, and a pump for transporting nanofluid as the hot fluid and the other for the cold water. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Impression of the geothex heat exchanger showing the insulated inner pipe and helical. Effect of pressure hot on temperature profile and fluid properties along length of double pipe hx. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Introduction a heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between. Diagram of a single node for a double pipe heat exchanger.
Box 15000, halifax, nova scotia, canada, b3h 4r2, louis. A heat exchanger is a system used to transfer heat between two or more fluids. The heat exchange duty a llows calculation of the log mean. Pdf heat exchanger lab experiment chemical engineering.
Detailed theoretical discussion on the principles of heat transfer was consciously left to readers to read standard textbook in heat transfer. Chapter 3 heat exchanger design this chapter will provide the framework on how to design a double pipe and shell and tube type heat exchanger. The double pipe heat exchanger is one of the simplest types of heat exchangers. 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. 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.
Repeat the experiment using counter flow setup on heat exchanger. Experimental analysis of double pipe heat exchanger. Inserts when placed in the path of the flow of liquid, create a high degree of turbulence resulting in an increase in the heat transfer rate and the pressure drop. The influence of the mass flow of the shell side and the logarithmic mean temperature difference is studied. Laminar counter and parallel flows in a double pipe heat exchanger is studied experimentally using two types of nanofluids as a cooling medium. The heat exchanger is aimed to manufacture and to prepare an experimental setup. Heat transfer of nanofluid in a double pipe heat exchanger. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication.
Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Double pipe heat exchanger modeling comsol uses in. The analysis done is mainly done on the heat exchanger depending on the type of flow of the fluid in the heat exchanger. Feb 10, 2016 thermal conductivity, stefan boltzmann law, heat transfer, conduction, convecton, radiation, physics duration. Conventionally, spiral piping heat coupling mechanism is attributed to many factors such as geometrical configurations, compact size, bigger thermal conduction space, number of loops, etc.
A pipe in pipe heat exchanger, is one of the simplest type of. The most widely used double pipe heat exchanger is the hair pin. A wide variety of double pipe heat exchanger price options are available to you, such as ccc, ce, and rohs. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Thus it is the authors ambition to use the previous article ideas and combine them so that after the modelling work to analyse the heat exchanger using a. Jan 23, 20 double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend.
All about double pipe heat exchangers what you need to know. As part of a space experiment, a small instrumentation pack. Heat exchanger the purpose of a heat exchanger is just thatto exchange heat. Experimental studies of a doublepipe helical heat exchanger. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by literature correlations. In this experiment, a hybrid material counter flow double pipe heat exchanger was.
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