The heat exchange duty a llows calculation of the log mean. Concentric tube or pipe heat exchangers are used in a variety of industries for purposes such as material processing, food preparation, and airconditioning. Plate and frame type heat exchangers give large surface area for heat transfer than other heat exchangers. The system is in steady state until conditions change, such as flow rate or inlet temperature. One fluid flows in the inner pipe, while a second fluid flows in the outer pipe annuals. A double pipe heat exchanger consists of one pipe inside another. The main advantage of the hche, like that for the spiral heat exchanger she, is its highly efficient use of space, especially when its limited and not enough straight pipe can be laid.
Plate heat exchangers working principle is to provide heat transfer between two liquids. For sufficiently high heat duties it may be more economical to use cooling water instead of cooling air provided adequate water supply is available. In heat exchanger is the concentric tube or doublepipe heat exchanger shown in figure 1, in which one pipe is placed inside another. Products double pipe heat exchangers heat transfer. Department of energy, nuclear physics and reactor theory.
Double pipe heat exchanger manufacturers india heat. These qualities make double pipe heat exchangers very popular with smaller companies, or companies with limited resources. Crossflow just doesnt work for a double pipe heat exchanger. To get a basic understanding of the principles behind these designs, read our article on. Various doublepipe heat exchanger working fluid characteristics and performance enhancement abilities were discussed by several researchers. China doublepipe heat exchanger manufacturers select 2020 high quality doublepipe heat exchanger products in best price from certified chinese heat system manufacturers, heat water suppliers, wholesalers and factory on. A heat exchanger is a device used to transfer heat between two or more fluids. Double tube plate heat exchanger working principle. A double pipe heat exchanger also sometimes referred to as a pipeinpipe exchanger is a type. The essential principle of a heat exchanger is that it transfers the heat without transferring the fluid that carries the heat. Experimental investigation of doublepipe heat exchangers in air. Various doublepipe heat exchanger working fluid characteristics.
A heat exchanger is a system used to transfer heat between two or more fluids. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Dec 27, 2017 therefore by transmitting the heat, from warm air to the cooled outgoing stream supply air, the heat pipe exchangers are responsible to create double effect of precooling the working air, before it goes to the evaporator section and finally reheating it immediately. The fluids can be single or two phase and, depending on the exchanger type, may be separated or in direct contact. Shellandtube heat exchangers are further classified according to the number of. We will first examine what makes a heat exchanger a doublepipe design, how they. These exchangers have a tube in tube heat exchanger structure which gives them this name. Whether it is a double pipe heat exchanger or shell and tube or plate heat exchanger or others of various kinds the underlying principle is same although specifics differ greatly. Calculate the heat transfer area of the double pipe heat exchanger in the lab.
Robert reed burn, introduction to nuclear reactor operation, 1988. Like every heat exchanger plate and frame type heat exchanger just provides surfaces for heat transfer. The flow inside the heat exchanger could be either cocurrent or countercurrent. Plate heat exchangers were first produced in the 1920s and have since been widely used in a great number of sectors a plate exchanger consists of a series of parallel plates that are placed one above the other so as to allow the formation of a series of channels for fluids to flow between them. Double pipe heat exchangers are also known as hairpin, jacketed pipe, jacketed utube and concentric pipe. The two most common heat exchanger design problems are those of rating and sizing. Q is the rate of heat transfer between the two fluids in the heat exchanger in btuhr. 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.
Some factors that influence the heat exchanger performance are. In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a. Determination of the heat transfer surface area needed for a double pipe heat exchanger design can be done using the basic heat exchanger equation. In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a pipe, usually of a straightleg construction with no bends. Double pipe heat exchanger simply consists of two concentric tubes. Understanding heat exchangers types, designs, applications. The liquid to be heated or the heating, are totally seperated from each other with plates. Overall heat transfer coefficient for doublepipe heat exchanger. Heat exchanger is a device which transfers heat from one medium to another example will remove heat from hot oil by using cold water or air. 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. Various types of heat exchanger follow this general principle.
As its name implies, this type of heat exchanger consists of a shell a large pressure vessel with a bundle of tubes inside it. Alternatively a swimming pool heat exchanger uses hot water from a boiler or solar heated water circuit to heat the pool water. Experimental investigation of doublepipe heat exchangers in. Devices involving energy sources such as nuclear fuel pins or fired heaters are not normally regarded as heat exchangers although many of the principles. Reboiler, heat exchanger, alcohol manufacturer supplier in china, offering stainless steel oil steam water double pipe fin shell and tube heat exchanger for refrigeration plants and equipment, 99. How gasketed plate heat exchangers work alfa laval. The working principle of typical air conditioning systems is based on the. The flow pattern and the required heat exchange duty allows calculation of the log. Fluids are a subset of the phases of matter and include liquidsgasesplasmas andto some extentplastic solids. 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. Single pass fluid enters one end of the heat exchanger, and exits at the other end.
Experimental investigation of doublepipe heat exchangers. This style is inexpensive to design and build and the units are also inexpensive to maintain. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat exchanger are examined by experimental methods. Principles of construction double pipe heat exchangers. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication. We are one of the major providers of double pipe heat exchanger manufacturers in india and the two types are counter flow and parallel flow heat exchanger. Heat exchangers are used in both cooling and heating processes. Double pipe heat exchanger design with counterflow or. Double tube plate heat exchanger is mainly used in sanitary grade demanding conditions, its unique design allows the heat exchanger tube is easy to completely emptying and keep clean, double tube plate structure to avoid the risk of a conventional heat exchanger is prone to cross contamination.
Although double pipe heat exchangers are the simplest to design, the better choice in the following cases would be the helicalcoil heat exchanger hche. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Hairpin heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat. Plate heat exchanger, how it works working principle hvac. Other articles where concentric tube heat exchanger is discussed. The double pipe heat exchanger is, in its simplest form, one pipe held concentrically inside of a larger pipe thus the name double pipe. Plate type heat exchanger working principle a plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat. The lamppost can be described as a vertical doublepipe singleflow heat exchanger with natural convection to the surrounding air. Similarly a shell and tube heat exchanger can be operated in approximately parallel flow by having both fluids enter at one end and exit at the other end. The double pipe heat exchanger is one of the simplest types of heat exchangers. All about double pipe heat exchangers what you need to know. 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. It is the most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higherpressure applications. Hot and cold liquids flow alternatively to each other as it is shown in the second figure.
The recovery of heat from low temperature systems requires different working. Plate heat exchanger working principle, how a plate heat. The inner pipe acts as the conductive barrier, where one fluid flows through this inner pipe and another flows around it through the outer pipe, forming an annulus shape. China stainless steel oil steam water double pipe fin. 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 also sometimes referred to as a pipeinpipe exchanger is a type of heat exchanger comprising a tube in tube structure. Working principle of shell and tupe heat exchanger answers. In the diagram the cold fluid flows through the inner tube and the warm fluid in the same direction through. 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 animation double pipe heat exchanger working animation heat exchanger animation heat transfer equipment. Often the double pipes in these exchangers have a utube or hairpin structure.
Double pipe heat exchanger is perhaps the simplest of all heat exchanger types. A shell and tube heat exchanger is a class of heat exchanger designs. Jul 21, 2014 double pipe heat exchanger the double pipe heat exchanger is the simplest and most basic type of industrial heat exchanger. A piece of equipment built for efficient heat transfer from one medium to another. The flow pattern and the required heat exchange duty allows calculation of the log mean temperature difference. One set of these tubes contains the fluid that must be either heated or. However, since double pipe heat exchangers are simple, they are used to teach heat exchanger design basics to students as the fundamental rules for all heat exchangers are the same. The crosssection of the lamppost is circular, and the heat loss to the surrounding air is assumed uniform. Heat pipe is generally selfheat recovery devices that is used to transfer heat from one end heat injection to another destination with minimum temperature differences and also to pass the heat across internal surface.
Double pipe heat exchangers are the simplest exchangers used in industries. The overall heat transfer characteristics of a double pipe. Base your calculation on the outside area of the inside pipe. Double tube plate heat exchanger china manufacturer. Heat exchanger and its types engineering solutions. Effects of temperature and concentration of nanoparticles on nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter turbulent flow are. The theory behind the operation of a doublepipe heat exchanger is covered in incropera. Apr 03, 2017 double pipe heat exchanger simply consists of two concentric tubes. Shell and tube heat exchangers consist of series of tubes. In many engineering applications it is desirable to increase the temperature of one fluid while cooling 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. 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. Heat exchanger manufacturers india, heat exchanger for oil. Double pipe heat exchanger the double pipe heat exchanger is the simplest and most basic type of industrial heat exchanger. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. 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. That together with an estimated overall heat transfer coefficient allows calculation of the required heat transfer surface area. Plate type heat exchanger working principle, working. Overall heat transfer coefficient for doublepipe heat.
The double pipe heat exchanger is often used in counterflow, where its fluids move in opposite directions as shown above. Therefore if a hot fluid and a cold fluid are separated by a heat conducting surface heat can be transferred from the hot fluid to the cold fluid. The heat exchanger is one of the simplest form of shell and tube heat exchangers. The theory behind the operation of a doublepipe heat exchanger was discussed in detail by f. Application of heat exchangers in bioprocess industry. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. Al 2 o 3 with a particle size of 20 nm and volume fraction of 0. This paper investigates the enhancement of heat transfer coefficient and nusselt number of a nanofluid containing nanoparticles. We look at 3d models, animations and real world examples. The steam or vapour illustrated in grey enters through one of the upper connections and the condensate leaves through the connection underneath.
A shell and tube heat exchanger passes fluids through and over tubes. Double pipe heat exchanger theory with working principle. Double pass fluid enters and exists the heat exchanger at the. This double action is economically accomplished by a heat exchanger. Numerical analysis of a vertical doublepipe singleflow. Che245 lab report solteq concentric tube heat exchanger unit he. As the name suggests, it consists of two pipes, one within the other. Normally one of them has the cooling fuid coolant and the other is the fluid we wish to cool it. The theory behind the operation of a double pipe heat exchanger was discussed in detail by f. Hairpin heat exchangers often also referred to as double pipes are characterized by a construction form which imparts a ushaped appearance to the heat exchanger. Heat pipe introduction,working principle,types,application. Heat transfer of nanofluid in a double pipe heat exchanger. Jul 06, 2017 in this video we learn how a plate heat exchanger works, covering the basics and working principles of operation.
The animation above shows the working principle of an alfa laval gasketed plateandframe heat exchanger when used as a steam heater. Various double pipe heat exchanger working fluid characteristics and performance enhancement abilities were discussed by several researchers. Shell and tube heat exchangers in their various construction modifications are probably the most widespread and commonly used basic heat exchanger configuration in industry. Heat is transferred by conduction through the exchanger materials which separate the mediums being used. The doublepipe heat exchanger is one of the simplest types of heat exchangers. As per the design of all shell and tube heat exchangers, one fluid flows through the smaller tubes.
Chapter 5 heat exchangers faculty of engineering and. Two of them are for heating liquid and two of them for heated liquid. A hot fluid shown in red flows through a tube coiled inside a larger shell through which another, colder fluid shown in blue is running in the opposite direction. Double pipe heat exchanger design with counterflow or parallel flow. This induces forced convection, transferring heat tofrom the. With parallel flow the temperature difference between the two fluids is large at the. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. In its classical sense, the term double pipe refers to a heat exchanger consisting of a pipe within a pipe.
A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Heat exchanger, any of several devices that transfer heat from a hot to a cold fluid. Principles of heat exchangers simplified heat exchanger concepts heat exchangers work because heat naturally flows from higher temperature to lower temperatures. Inlet and exit ducts are provided for the two fluids. In standart plate heat exchangers, there are 4 inletoutlet ports. Che245 lab report solteq concentric tube 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. Jul 09, 2017 heat exchanger is a device which transfers heat from one medium to another example will remove heat from hot oil by using cold water or air.
They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. Jan 23, 20 double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. In this doublepipe heat exchanger a hot process fluid flowing through the inner pipe transfers its heat to cooling water flowing in the outer pipe. Like every heat exchanger plate and frame type heat exchanger just provides surfaces for heat. Double pipe heat exchanger animation heat exchanger.
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