Such an arrarigement for a counterflow heat pipe heat exchanger is shown in fig. 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. 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. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Comparison of heat exchanger types each of the three types of heat exchangers parallel, cross and counter flow has advantages and disadvantages. What are the advantages and disadvantages of a double pipe. Heat exchangers 73 individual thermal resistances of the system. Double pipe heat exchanger this project work is based on design and thermal analysis of double pipe heat exchanger.
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. Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Safety precaution is of utmost importance with any process. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface 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. To understand the basic operation of heat exchangers. Fin construction details section of a double pipe heat exchanger. A double pipe heat exchanger is available to cool 0. The fluid flows in the inner pipe is the tube side and in exchange another fluid flows in the outer pipe annulus. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration.
They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural. 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. A double pipe heat exchanger, into its simplest form is presently one pipe within another larger pipe. Instead, the original flow streams remain intact and separated. A double pipe, countercurrent, singlephase heat exchanger with. Its widely used in chemical, energy, machinery, transportation, refrigeration, air conditioning and aerospace fields. This paper investigates the enhancement of heat transfer coefficient and nusselt number of a nanofluid containing nanoparticles. Modeling of the heat pipe heat exchangers for heat recovery. In this paper, studied overall heat transfer coefficient in fabricated of double pipe heat exchanger in laboratory scale by using smooth pipe and twist tape experimentally for affecting parameters. We offer a broad range of alloys, sizes, and specifications. Alibaba manufacturer directory suppliers, manufacturers. Each of these methods has particular advantages depending upon the nature of the. Heat exchangers are used in both cooling and heating processes.
The coolant in radiator coils in an internal combustion engine is one example of a heat exchanger. The theories of transient heat transfer in doublepipe heat exchangers were explained and followed by. Products double pipe heat exchangers heat transfer. 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. Whether your application requires seamless or welded stainless steel tubing, you can always count on consistent, high quality tubing manufactured by our specialists at plymouth tube company. What are the advantage and disadvantages of double pipe. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication. Box 15000, halifax, nova scotia, canada, b3h 4r2, louis. This project work is based on design and thermal analysis of double pipe heat exchanger. These are typically used in applications where there is a ducted exhaust stream.
A piece of equipment built for efficient heat transfer from one medium to another. Combining each of these resistances in series gives. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Double pipe heat exchangers, plate type heat exchanger. The second type is regenerative type, in which hot and cold fluids are in the same space which contain a matrix of. Amsenergy supplies our clients with the most efficient style of heat pipe heat exchangers available. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig.
Thermal analysis of double pipe heat exchanger by changing. The heat exchanger is depicted by box 20 and is provided with water inlet 60 and water outlet 62. The first type of a heat exchanger is called the recuperative type, in which heat are exchanged on either side of a dividing wall by fluids. Numerical studies were performed with the aid of a commercial computational fluid dynamics package ansys fluent 14. The water circulates through the tubular coil in the heat exchanger unit. The outer diameter of the heat exchanger is around 1. Corcoran school of mechanical and manufacturing engineering dublin city university.
The simplest type of heat exchanger consists of two concentric pipes of different diameters, as shown in fig. To demonstrate the basic equations of heat exchanger operation. The overall heat transfer characteristics of a double pipe. A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers comparison compare different heat exchangers. A plate heat exchanger, phe, is a compact heat exchanger where thin corrugated plates some 0.
A procedures manual was created for the doublepipe heat exchanger. If the overall heat transfer coefficient is 1500 wm2 k and. Al 2 o 3 with a particle size of 20 nm and volume fraction of 0. The most widely used double pipe heat exchanger is the hair pin.
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. In the shell of the heat exchanger is circulated a refrigerant such as freon. What are the advantages and disadvantages of a double pipe heat. Heat transfer of nanofluid in a double pipe heat exchanger. A design exists because it met a need and continues to meet a need. Heat pipe heat exchanger heat exchanger, which transfers the heat from one medium to another, is the most common thermal equipment in various of industry sectors. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum.
The spiral heat exchanger is good for applications such as pasteurization, digester heating, heat recovery. 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 wide variety of double pipe heat exchanger price options are available to you, such as ccc, ce, and rohs. Optimum design of double pipe heat exchanger sciencedirect.
A device whose purpose is the transfer of thermal energy between two fluids. Effects of temperature and concentration of nanoparticles on nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter. In double pipe heat exchangers, geometry change is also a considerable method for increasing the performance evaluation criterion in heat exchangers which requires more studies in future. Optimization of double pipe helical coil heat exchanger with various optimizing parameters and its comparison with double pipe straight tube are the prime objectives of this paper. The total heat transfer area to be provided is around 6. The high stresses produced by differential thermal expansion.
A typical double pipe heat exchanger basically consists. Both plate type and shell and tube heat exchangers are normally used on ships. Our heat pipe heat exchangers featuring thermosyphon technology that has been shown to transfer heat up to 10,000 times faster than other heat exchanger technologies allowing for a greater thermal energy transfer on a kw or btu recovery basis leading to near isothermal. Double pipe heat exchanger design step by step software. 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. 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. Double pipe heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to. The use of flanged connections allows double pipe heat exchangers to be completely stripped down for cleaning and maintenance. The main advantage of a hairpin double pipe heat exchanger is that it can be operated in a true counter flow pattern, to get more efficiency, in the mean time, it will give the highest overall heat transfer coefficient for the double pipe heat exchanger design. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Heat exchanger tubing manufacturer tube heat exchanger.
The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. The heat exchange duty a llows calculation of the log mean. Example of a double pipe heat exchanger in real life. Reason for heat exchangers a heat exchanger is a piece of equipment built for. Plymouth tube has been supplying specialty heat exchanger tubing for over forty years. The wall of the inner pipe is the heat transfer surface. Both type of heat exchangers have advantages and disadvantages. The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products. The most basic and the most common type of heat exchanger construction is the tube and. You are probably aware there are many types of heat exchanger design.
All about double pipe heat exchangers what you need to know. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Double pipe heat exchanger, operations and applications. Air that is exhausted from a building, to maintain favorable indoor air quality, has been cooled summer or heated winter to the typical space temperature of. Optimisation of double pipe helical tube heat exchanger. Double pipe heat exchanger modeling comsol uses in undergraduate education louis desgrosseilliers and dominic groulx mechanical engineering department, dalhousie university corresponding author. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area.
Double pipe heat exchangers are the simplest exchangers used in industries. Doublepipe heat exchanger introduction this application models the temperature dynamics of a countercurrent double pipe heat exchanger. In addition, heat exchangers are also used in chemical plants, petroleum refineries, sewage treatment and nuclear power facilities. The huber tubewin heat exchanger is designed to withdraw sewage from the sewer, screen it, pump it through aboveground heat exchangers to recover the energy, and then return it. A double tube heat exchanger is able to achieve pure counter current flow thus allowing for a temperature cross to be achieved whereby the cold fluid can be heated above the exit temperature of the hot fluid. The overall heat transfer characteristics of a double pipe heat exchanger. 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. In this paper the double pipe helical coil is analysed. Some inherent limitations of the plate heat exchangers are caused by plates and. Dunn 3 described different application heat pipe in the areas of space craft, chemical reactors etc. The heat exchanger as a piece of equipment is a simple model and therefore, has many applications in industry. 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 modeling comsol uses in. Heat transfer is accomplished via multiple small heat pipes extending through the common wall of the hot and cold side flow streams.
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