These are typically used in applications where there is a ducted exhaust stream. What is heat pipe working of heat pipe exchanger for. Astm a498 a49898 specification for seamless and welded carbon, ferritic, and austenitic alloy steel heat exchanger tubes with integral fins. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. This application models the temperature dynamics of a countercurrent double pipe heat exchanger. Finned pipes and tubes are commercially available in various sizes and materials. Finned pipe and tubes are used within shell and tube type heat exchangers to enhance the heat transfer between the inside of the heat exchanger tube or. Pdf application of heat pipe heat exchangers in heating. In the first part of the paper a presentation of the modelization of the hphe is. Its widely used in chemical, energy, machinery, transportation, refrigeration, air conditioning and aerospace fields.
The two most common heat exchanger design problems are those of rating and sizing. This specification covers seamless, internally enhanced copper tube, in straight lengths or coils, suitable for use in refrigeration and airconditioning products or other heat exchangers. Pdf heat pipe heat exchanger for heat recovery in air. 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. With this configuration, the maximum heat capacity is due.
In large steam systems, or in any process requiring high temperatures, the input fluid is usually preheated in stages, instead of trying to heat it in one step from. The overall heat transfer characteristics of a double pipe heat exchanger. Introduction to heat exchangers bengt sunden lund institute of technology. A heat exchanger is a device that is used to transfer thermal energy enthalpy between. Heat transfer is accomplished via multiple small heat pipes extending through the common wall of the.
Double pipe heat exchangers are the simplest exchangers used in industries. Modeling of the heat pipe heat exchangers for heat recovery. This chapter presents the study of a heat pipeequipped heat exchanger with 1. Heatex flue pipe heat exchanger installation and operating manual read this manual to ensure proper installation warnings and disclosures this product is to be used with an oil burning or solid fuel burning heating or cooking appliance. The goal is to achieve a continuous supply of fresh air into occupied commercial or industrial work spaces while exhausting an equal amount of potentially stale.
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 capabilities. Chapter 5 heat exchangers faculty of engineering and. Two streams of fresh and return air were connected with a hphe to investigate the. 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. Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. 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, or between solid particulates and a fluid, at different temperatures and in thermal contact.
Maxiflo is a tube heat exchanger with excellent heating. Pipe heat exchanger manufacturer, supplier, exporter. Journals pdf frontiers in heat pipes fhp heat pipe. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. In large steam systems, or in any process requiring high temperatures, the input fluid is usually preheated in stages, instead of trying to heat it in one step from ambient to the final temperature. In alfa laval plate heat exchangers, heat is transferred from one medium to another through thin metal plates which have been pressed into a special pattern. Instead, the original flow streams remain intact and separated. This will help to prevent clogging the heat exchanger with the product being conveyed. Heat pipe heat exchanger for heat recovery in air conditioning was investigated by abdelbaky and mousa 10. The doublepipe heat exchanger is one of the simplest types of heat exchangers. I could go with a aluminum heat exchanger and sacrificial rod, but that requires more maintenance and more failure possibilities. Manor heat pipe heat exchanger as standard are suitable for airto air heat recovery for a temperature range of 10. Equation is used when simple counter or cocurrent flows exist. Airtoair heat pipe heat exchanger hpaahx selection tool.
Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. To understand the basic operation of heat exchangers. Heat exchangers have widespread industrial and domestic applications. 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. This exchanger is used in air conditioning, power plants, space heating, refrigeration, chemical plants, petrochemical plants and many more for heat transfer from one medium to another. A heat exchanger follows this principle in its endeavour to reach equalisation. The double pipe heat exchanger is one of the simplest types of heat exchangers. A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchanger problem calculation lmtd and effectiveness. Amsenergy supplies our clients with the most efficient style of heat pipe heat exchangers available. Heat pipe heat exchanger on sales quality heat pipe heat. Astm a249 a249a249m specification fors welded austenitic steel boiler, superheater, heat exchanger, and condenser tubes. C12200 and shall be of such purity and soundness as to be suitable.
However, in a heat pipe heat exchanger, the heat pipe not only acts as a separating wall, but also facilitates the transfer of heat by condensation, evaporation. The temperature distribution between the two fluids remains more or less nearly constant. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Yau, application of a heat pipe heat exchanger to dehumidification enhancement in tropical hvac systems a baseline performance characteristics study, international. Figure 5 illustrates the spiral exchanger configuration.
Finned pipe and tubes are used within shell and tube type heat exchangers to enhance the heat transfer between the inside of the heat exchanger tube or pipe, and the outside. Pulsation andor vibration can cause metal fatigue and lead to failure of the heat exchanger. As indicated in figure 7, the double pipe exchanger consists of a pipe within a pipe. 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. Heat pipe heat exchanger energy recovery systems offer both cost and performance benefits over traditionally available heat exchanger technologies.
A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and. The temperature difference between the fluid and the wall varies along the length of the heat exchanger. In alfa laval plate heat exchangers, heat is transferred from one medium to another through thin metal plates. Numerical solution of homogeneous double pipe heat exchanger. The hot and cold fluids enter at the opposite ends. To demonstrate the basic equations of heat exchanger operation. A device whose purpose is the transfer of slideshare uses cookies to. The material of manufacture shall be cast billet, bar, tube, or so forth of copper uns no. The notes are intended to describe the three types of heat transfer and provide. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Balanced counter flow heat exchanger assuming and cc, then the lmtd becomes undefined as. The overall heat transfer characteristics of a double pipe.
Heat transfer is accomplished via multiple small heat pipes extending through the common wall of the hot and cold side flow streams. This program will assist the hvac design engineer in the proper selection of an airtoair heat pipe heat exchanger aahx and provide energy savings estimates. As the name suggests, it consists of two pipes, one. Combining each of these resistances in series gives. A device whose purpose is the transfer of slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The double pipe exchanger is used when one liquid has a greater resistance to heat flow than another r when the surface area is small. Acthphrv heat pipe heat recovery ventilator is a complete, filtered ventilation system that incorporates an outside air supply fan and a building exiting air exhaust fan. This paper investigates the enhancement of heat transfer coefficient and nusselt number of a nanofluid containing nanoparticles. Scribd is the worlds largest social reading and publishing site. 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. Finned tubes and pipes heat exchangers engineers edge. They are made out of doublelayered steel, which allows them a long life span, and.
Our heat pipe heat exchangers featuring thermosyphon technology that has been shown to transfer heat. In this paper the heat pipe heat exchanger hphe is presented as a new and very attractive heat exchanger type. Heat transfer of nanofluid in a double pipe heat exchanger. Maxiflo is a tube heat exchanger with excellent heating properties, made of acid proof stainless steel for optimum life. With the current prices on soft copper pipe i am not excited about making a heat exchanger for a storage tank. If the heat exchanger is used in a pneumatic conveying system, a check valve should be placed between the air lock and the heat exchanger. Investigation of the thermal and hydraulic properties of a novel heat. Such an arrarigement for a counterflow heat pipe heat exchanger is shown in fig. Double pipe heat exchanger ce 328 spring 2003 objective. Al 2 o 3 with a particle size of 20 nm and volume fraction of 0. Flow control valve maxiflo swimming pool heat exchangers model wmph95 6360000430309. Standard specification for seamless copper heat exchanger. They are also referred to as heat barriers and are often located where the flue pipe goes through a wall, ceiling or the roof of the building in question.
Counter flow heat exchangers are the most efficient of the three types. If the flow pattern is more complex such as the case with most shell and tube heat exchangers, then a correction factor term is used and the. 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 70 to 75f. With a temperature range of heat recovery now encompassing 50c to 2500c, our heat pipe heat exchangers have the capacity to fulfill most heat transfer requirements. In the first part of the paper a presentation of the modelization of the hphe is given, in the second part some technologocal considerations are developped and in the third part two exemples of industrial applications are described. It is called a doublepipe exchanger because one fluid flows inside a pipe and the other fluid flows between that pipe and. Model capacity primary, hot water secondary, pool water kw. Heat exchanger knowledge heat exchanger companies suppliers. Towards an optimal design of heat pipe equipped heat. In this study, analysis of shell and tube heat exchanger he is performed.
They are also referred to as heat barriers and are often located where the flue pipe goes through a wall. Heatex flue pipe heat exchanger installation and operating manual read this manual to ensure proper installation warnings and disclosures this product is to be used with an. In a counter flow heat exchanger, the two fluids flow in opposite directions. Dynamic modeling of a doublepipe heat exchanger is the subject of the current study. The theories of transient heat transfer in doublepipe heat exchangers were explained and. The term heat exchanger applies to all equipment used to transfer heat between two streams. A procedures manual was created for the doublepipe heat exchanger. Three partial differential equations describe heat balances. Jan 23, 20 double pipe heat exchanger two sets of concentric pipes, two connecting tees, and a return head and a return bend. Heat exchangers 73 individual thermal resistances of the system.
Air that is exhausted from a building, to maintain favorable indoor air quality. For a pipe of circular cross section, completely without voids filled with liquid, this. 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. It is designed to be used with a specified flue size. The term heat exchanger applies to all equipment used to transfer heat between. Connections holes matching the piping lead through the frame plate, permitting the media to enter into the heat. Heat exchangers install within a flue pipe to retrieve a percentage of the heat lost through the pipe. The test section is a counter current double pipe heat exchanger with the length of 120 cm. 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. A liquid twophase fluid heat exchanger is referred to as a compact heat exchanger if the surface area density on any one fluid side is above about 400 m2m 3 122 ft2ft3.
Journals pdf frontiers in heat pipes fhp heat pipe heat. To study and evaluate the effects of flow conditions and flow configurations on the rate of heat transfer through thin walled tubes. A drawing of such a heat pipe heat exchanger hphe is shown in fig 2. The double pipe heat exchanger configuration simulated consisted of two concentric pipes, the outer pipe carries the hot fluid and the inner pipe carries cold fluid. Astm standard specification for heat exchanger and condenser. I could go with a aluminum heat exchanger and sacrificial rod, but that. The heat pipe based heat exchanger applications were discussed by amir faghri 4 in his book. 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. The basis of this study is the same velocity of vapor and liquid phases or. 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.
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. Preheater application heat exchanger engineers edge. Lectures 19 applied heat transfer cm3110 1232019 3 t, outer bulk temperature t, inner bulk temperature l but. If the heat exchanger is used in a pneumatic conveying system, a check valve should be.