The simple double pipe heat exchanger is inadequate for large flow rates. Combining each of these resistances in series gives. The double tube composition allows for unrestricted flow of product, making it the ideal heat exchanger for viscous products. The basic designs for heat exchangers are the shellandtube heat exchanger and the plate heat exchanger, although many other configurations have been developed. Advantagesdisadvantages of doublepipe he advantages. The gardening channel with james prigioni recommended for you. 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.
All about double pipe heat exchangers what you need to know. It is most simple and easily operated heat exchanger. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. 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. Longer contact time and higher heat exchange surface area allows greater heat tran. The overall heat transfer characteristics of a double pipe. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and. Aircooled heat exchangers an overview sciencedirect. The advantages of cooling with air may be seen by comparing air cooling with. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area.
Heat exchangers are used in industrial processes to recover heat between two process fluids. 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. The doublepipe heat exchanger is one of the simplest types of heat exchangers.
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. Normal size doublepipe heat exchangers are competitive at duties requiring 100200 ft2 built of carbon steel where possible. Ppt heat exchangers powerpoint presentation free to. When large areas are required we go for shell and tube 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. We have examined the final copy of this project and in our opinion. We certify that the project entitled design of small heat exchanger double pipe type is written by mohamad shafiq bin alias. Cross flow cooling tower cooling towers heat exchanger. You are probably aware there are many types of heat exchanger design.
Double pipe heat exchangers, plate type heat exchanger. The major considerations and assumptions made for sizing of triple concentric pipe heat exchanger are as follows. Large volumes of vapor may be condensed using this type of heat exchanger flow. A heat exchanger is a system used to transfer heat between two or more fluids. The temperature needs to be accurately regulated to provide the downstream unit operations with milk at the expected temperature and consistency. The modules listed in the overview are linked to the corresponding pages. The double pipe heat exchanger is one heat exchanger pipe inside another larger pipe for either counter flow or parallel flow pattern.
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. Products double pipe heat exchangers heat transfer. 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. Doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes. Cross flow gravity distributes the water through the nozzles uniformly across the fill material. Provides maximum heat transfer surface per given shell and tube size.
Double tube heat exchangers are designed whereby one tube is concentrically positioned within a larger tube. Tube heat exchanger is a class of heat exchanger designs used in all processes. 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. A design exists because it met a need and continues to meet a need. Single inner pipe formed into a removable u or element, with either longitudinal fins or centralizing supports. Oil cooler is another type of heat exchanger in which high temperature oil is cooled by using some coolant. A piece of equipment built for efficient heat transfer from one medium to another. 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. The most widely used double pipe heat exchanger is the hair pin. Doublepipe exchangers is the generic term covering a range of jacketed u tube exchangers normally operating in countercurrent flow of two types. The high stresses produced by differential thermal expansion between outer and inner pipes are more easily handled. Both plate type and shell and tube heat exchangers are normally used on ships. Plate type heat exchanger advantages and disadvantages.
Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. The overall heat transfer characteristics of a double pipe heat exchanger. How to build a hinged hoophouse for a raised bed garden duration. In addition, heat exchangers are also used in chemical plants, petroleum refineries, sewage treatment and nuclear power facilities. The wall of the inner pipe is the heat transfer surface. Fin construction details section of a double pipe heat exchanger. 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. Heat exchangers 73 individual thermal resistances of the system. Ppt heat exchange equipment powerpoint presentation. 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 exchangers manufacturer india a double pipe heat exchanger, in its simplest form is just one pipe inside another larger pipe. Two cold water streams cooling medium flow through central pipe and outer annular space in same direction. A device whose purpose is the transfer of thermal energy between two fluids. The software will do all the thermal calculations involved in the design and will generate a summary of. 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. If several double pipes are used in parallel, the weight of metal required for the outer tubes becomes so large. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of. Which is more efficient, shell and tube heat exchangers or. And the u tube heat exchanger bending radius should not less than two times the outer diameter of the heat exchanger.
They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants. Tech 1 pg scholar, department of thermal, mlr institute of technology, ranga reddy, telangana, india. Hot water flows through the inner annular space in opposite direction to that of the cold water streams. One fluid flows through the inside pipe and the other flows through the annulus between the two pipes. 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. 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. Modeling and simulation of the double tube heat exchangers. Both type of heat exchangers have advantages and disadvantages. Although the advantages of heat exchangers are apparent in the immense variety of applications they have, heat exchanges also have some disadvantages. The heat exchanger is characterized by four input values and two output values, figure. Access the url below and click on the websimulator icon.
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. Double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Double pipe heat exchanger design security and download notice download. 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. Hisaka websimulator hws plate heat exchanger this is the. The heat exchanger as a piece of equipment is a simple model and therefore, has many applications in industry. The cooled water inside the heat exchanger tubes is then pumped back to the condenser. Plate type heat exchanger advantages and disadvantages advantages of plate type heat exchanger is a simple and compact in size. Typical standard sizes, layout and overall dimensions are shown. What are the advantage and disadvantages of double pipe. As a part of the process, milk is heated by water in a countercurrent double pipe heat exchanger. Advantages of tube heat exchangers ekin endustriyel. A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. In which both hot and cold fluid pass simultaneously.
226 1142 383 603 600 353 1228 1027 457 393 1520 1151 1328 899 414 478 1492 1223 1342 139 667 1383 966 1051 763 526 1294 1177 292 1258 16 1269 336 1339 214 104 1196 626