Although the advantages of heat exchangers are apparent in the immense variety of applications they have, heat exchanges also have some disadvantages. Large volumes of vapor may be condensed using this type of heat exchanger flow. Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. The gardening channel with james prigioni recommended for you. Cross flow is a design in which the air flow is directed perpendicular to the water flow air flow enters one or more vertical faces of the cooling tower to meet the fill material. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. Single inner pipe formed into a removable u or element, with either longitudinal fins or centralizing supports. You are probably aware there are many types of heat exchanger design. Tube heat exchanger is a class of heat exchanger designs used in all processes.
The most widely used double pipe heat exchanger is the hair pin. The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products. 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. The modules listed in the overview are linked to the corresponding pages. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants.
But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. How to build a hinged hoophouse for a raised bed garden duration. Heat exchangers are used in engines of cars, ships, and planes to improve the efficiency of the engine and are also used in refrigerators and air conditioners. Provides maximum heat transfer surface per given shell and tube size. Double pipe heat exchangers manufacturer india a double pipe heat exchanger, in its simplest form is just one pipe inside another larger pipe. Ppt heat exchangers powerpoint presentation free to. The temperature needs to be accurately regulated to provide the downstream unit operations with milk at the expected temperature and consistency. 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. We have examined the final copy of this project and in our opinion. The cooled water inside the heat exchanger tubes is then pumped back to the condenser. The overall heat transfer characteristics of a double pipe. One fluid flows through the inside pipe and the other flows through the annulus between the two pipes.
Both plate type and shell and tube heat exchangers are normally used on ships. 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. Normal size doublepipe heat exchangers are competitive at duties requiring 100200 ft2 built of carbon steel where possible. The coolant in radiator coils in an internal combustion engine is one example of a heat exchanger. A device whose purpose is the transfer of thermal energy between two fluids. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Longer contact time and higher heat exchange surface area allows greater heat tran. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another.
Many modern heat exchangers, such as the plate heat exchanger, are very adaptable, which makes them suited for a wide variety of. Combining each of these resistances in series gives. All about double pipe heat exchangers what you need to know. If several double pipes are used in parallel, the weight of metal required for the outer tubes becomes so large. Double pipe heat exchangers, plate type heat exchanger. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. Mainly water is used as cooling fluid due to easy availability. Hisaka websimulator hws plate heat exchanger this is the. Although the necessary equations for heat transfer and the pressure drop in a double pipe heat exchanger are available, using these equations the optimization of the system cost is laborious. The heat exchange duty a llows calculation of the log mean. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias.
Heat exchangers are used in both cooling and heating processes. Double pipe exchangers can be paired in series or in parallel to increase the heat transfer rate through a system without complication. 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. Heat exchangers 73 individual thermal resistances of the system. What are the advantages and disadvantages of a double pipe. Turbulent flow help to reduce deposits which heat transfer, no extra space is required for dismantling in plate heat exchangers. This pdf presentation is designed to highlight the features and benefits of plate heat exchangers, both bare and packaged as opposed to other methods of heat transfer. 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 exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend.
What are the advantage and disadvantages of double pipe. A design exists because it met a need and continues to meet a need. The basic designs for heat exchangers are the shellandtube heat exchanger and the plate heat exchanger, although many other configurations have been developed. Modeling and simulation of the double tube heat exchangers. Heat exchangers are used in industrial processes to recover heat between two process fluids. Products double pipe heat exchangers heat transfer. Fin construction details section of a double pipe heat exchanger. When large areas are required we go for shell and tube heat exchangers.
Cross flow gravity distributes the water through the nozzles uniformly across the fill material. 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. It is most simple and easily operated heat exchanger. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer.
Advantagesdisadvantages of doublepipe he advantages. The software will do all the thermal calculations involved in the design and will generate a summary of. A food processing company is developing a new product with milk as a key ingredient. Access the url below and click on the websimulator icon. Figure 5 cross flow heat exchanger comparison of the types of heat exchangers each of the three types of heat exchangers has advantages and disadvantages. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern. The heat exchanger as a piece of equipment is a simple model and therefore, has many applications in industry.
The wall of the inner pipe is the heat transfer surface. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. In addition, heat exchangers are also used in chemical plants, petroleum refineries, sewage treatment and nuclear power facilities. Advantages of tube heat exchangers ekin endustriyel. The major considerations and assumptions made for sizing of triple concentric pipe heat exchanger are as follows. A piece of equipment built for efficient heat transfer from one medium to another. Which is more efficient, shell and tube heat exchangers or. Oil cooler is another type of heat exchanger in which high temperature oil is cooled by using some coolant. Cross flow cooling tower cooling towers heat exchanger.
Aircooled heat exchangers an overview sciencedirect. Heat exchanger dealers in uae heat exchangers are devices that are used to transfer heat from one medium to another or from one liquid to another without the two fluids having to come into contact with each other. The overall heat transfer characteristics of a double pipe heat exchanger. In which both hot and cold fluid pass simultaneously. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. Optimum design of double pipe heat exchanger sciencedirect. Plate type heat exchanger advantages and disadvantages advantages of plate type heat exchanger is a simple and compact in size. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. U tube heat exchanger design the biggest difference about u tube heat exchanger compared with other types of heat exchanger is the tube buddle structure, the longer the tube diameter is, the longer the minimum bending radius is. Both type of heat exchangers have advantages and disadvantages. They can be designed and manufactured to bear very high pressures. The heat exchanger is characterized by four input values and two output values, figure. Hot water flows through the inner annular space in opposite direction to that of the cold water streams.
The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Tubular heat exchangers can be designed and manufactured with special geometries for pharma applications, as double tube sheet, that ensure that cross contamination doesnt appear in the case of a leakage of a tubetotubesheet joint. Double pipe heat exchanger design dhex is a software tool that is made to demonstrate the chemical design calculations of double pipe hairpin heat exchangers. Double pipe heat exchanger design security and download notice download. Two cold water streams cooling medium flow through central pipe and outer annular space in same direction. The advantages of cooling with air may be seen by comparing air cooling with. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Plate type heat exchanger advantages and disadvantages. And the u tube heat exchanger bending radius should not less than two times the outer diameter of the heat exchanger. Easy to obtain countercurrent flow can handle high pressure modular construction easy to maintain and repair. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration.
This pdf presentation is designed to highlight the. Doublepipe exchangers is the generic term covering a range of jacketed u tube exchangers normally operating in countercurrent flow of two types. Comparison of heat exchanger types each of the three types of heat exchangers parallel, cross and counter flow has advantages and disadvantages. A heat exchanger is a system used to transfer heat between two or more fluids. Ppt heat exchange equipment powerpoint presentation.
750 336 1508 1011 98 614 377 1202 745 518 207 665 181 951 908 95 807 311 418 1297 1034 548 1036 236 403 1471 601 261 501 320