Pdf design of double pipe heat exchanger kirti zare. Heat exchanger is one of the important devices in cooling and heating process in factories, buildings, transports and others. Double pipe heat exchanger introduction this application models the temperature dynamics of a countercurrent double pipe heat exchanger. Micro heat tube array the micro heat pipe mhp is a novel type of flat heat pipe, whose outer surface is fabricated with aluminium materials and small amounts of the working medium. A heat exchanger is a device used to transfer heat from one medium to another without violating the integrity of either medium.
Heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids. Heat pipe heat exchanger for heat recovery in air conditioning. 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. In heat exchangers, as the name suggests, there is a transfer of energy. Heat exchange involve convection in each fluid and conduction through the separating wall.
Overall heat transfer coefficient for doublepipe heat. The research is focused on developing a heat pipe heat exchanger for domestic hot water and thermal agent preparation, preheating heating. Us9939203b2 variable heat rejection using heat pipe heat. The flow of the products in countercurrent, which makes it possible to have a close temperature approach between the two medias being treated in the heat exchanger.
Thermal performance of a lowtemperature heat exchanger. 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. A heat pipe is a device that effortlessly transports thermal energy from its one point to the other. The overall heat transfer characteristics of a double pipe heat exchanger. Pdf the recovery system consists in a heat pipes based heat exchanger that allows efficient transfer from the waste energy to a heat pump. However, the term is commonly used to equipment in which two process streams exchange heat with each other. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 20 41. The plate heat exchanger phe is a specialized design well suited to transferring heat between medium and lowpressure fluids. May 04, 2009 heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. The effectiveness of an airtoair heat pipe heat exchanger is the ratio of the energy transferred versus the maximum possible amount of energy that could be transferred for the conditions that it is exposed. In the second type, a metallic heat exchanger pipe embedded in an absorber glass pipe has a small quantity of mass inside liquid acetone or alcohol, which receives heat from solar radiation and is converted into vapor latent heat, going up to the header at the top of the collector and transferring the heat to the water or waterglycol inside it. For the heat transfer to occur two fluids must be at different temperatures and they must come thermal contact. A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Pdf heat pipe in modern heat exchangers researchgate.
Airtoair heat pipe heat exchanger hpaahx selection tool. Introduction to heat exchangers bengt sunden lund institute of technology. Heat transfer heat exchanger types of heat exchangers. Heat pipes seminar ppt with pdf report study mafia. Jul 01, 2016 heat exchanger is a process equipment designed for the effective transfer of heat energy between two fluids. The heat exchanger is found in large construction to support cooling process such as fossil fuel power plant. This includes knowledge of precautions regarding media type, pressures, temperatures in the heat exchanger as well as specific precautions required by the process. Chordia, in fundamentals and applications of supercritical carbon dioxide sco. Their heat transfer coefficient in the evaporator and condenser zones is 103105 wm2 k, heat pipe thermal resistance is 0. In a counter flow heat exchanger, the two fluids flow in opposite directions. Heat exchangers have widespread industrial and domestic applications. Amsenergy supplies our clients with the most efficient style of heat pipe heat exchangers available.
Spirax sarco to make the recovery of corrosive and contaminated exhaust heat a reality. This is very convenient for many processes, especially when product purity needs to be ensured. Doublepipe heat exchanger introduction this application models the temperature dynamics of a countercurrent double pipe heat exchanger. Heat pipe is a selfcontained passive energy recovery device. The overall heat transfer characteristics of a double pipe. It applies the implied heat of the vaporized working fluid instead of the reasonable heat. Mechanisms of heat transfer university of oklahoma.
Heat exchanger is widely applied to industrial process, power plant, transportation. The main function of a heat exchanger or heat recovery system is to increase the energy efficiency of a heating or cooling system by transferring heat between two gases or fluids, thus reducing energy bills. 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. Erickson living installs hpts passive dehumidification systems at many of their facilities, saving thousands of dollars in air conditioning and reheat costs.
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. The temperature distribution between the two fluids remains more or less nearly constant. For sensible only devices like heat pipe heat exchangers, the effectiveness is typically reported as temperature effectiveness. Heat exchangers are typically classified according to flow arrangement and type of construction. In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and. 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.
Optimal heat pipe heat exchanger design sciencedirect. The double pipe heat exchanger is one of the simplest types of heat exchangers. Pdf heat pipe heat exchanger for heat recovery in air. In this paper the heat pipe heat exchanger hphe is presented as a new and very attractive heat exchanger type. We are the professoinal supplier of outdoor telecom cabinet, air conditioner, heat exchanger, and telecom. That is, it will give the highest overall heat transfer coefficient for the double pipe heat exchanger design. 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.
Research article heat transfer of nanofluid in a double pipe heat exchanger rezaaghayari, 1 heydarmaddah, 2 malihezarei, 1 mehdidehghani, 3 andsaharghanbarikaskarimahalle 4 department of chemical engineering, shahrood branch, islamic azad university, shahrood, iran. Heat exchangers are an enabling technology for efficient power generation with a closed, recuperated. Erickson living installs hpts passive dehumidification systems at many of their facilities, saving thousands of. Welded, semiwelded and brazed heat exchangers are used for heat exchange between highpressure fluids or where a more compact product is required. Design and demonstration of a heat exchanger for a compact. 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. Our heat pipe heat exchanger solution resists fouling and efficiently recovers heat, creating a cost effective energy recovery solution which is completely at home within these previously unsuitable environments. 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.
A heat exchanger is a device which transfers heat from one medium to another, a hydraulic oil cooler or example will remove heat from hot oil by using cold water or air. Heat exchanger principles with animation piping analysis. If the heat exchanger is located at the inlet or discharge of a blower with a pulsating flow, such as a roots type rotary lobe blower, the heat exchanger must be protected from the pulsation by a chambered silencer. Heat exchanger hx is a device that provides heat exchange between two fluids that have temperature difference.
The two most common heat exchanger design problems are those of rating and sizing. This page contains heat pipes seminar and ppt with pdf report. 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. What is heat pipe working of heat pipe exchanger for. Double pipe heat exchanger design with counterflow or. In a heat tube heat exchanger, groups of heat tubes are arranged in a box, divided into two parts by the center, a high temperature fluid flowing from one side, and a low temperature fluid s flowing from the other side, so as to allow heat transfer from the high temperature fluid to the low temperature fluid via the fluid contained hermetically in heat tubes. The system also includes a first flow regulator selectively adjustable in response to instructions from the control unit to direct a first flow of fluid over a portion of the first heat pipe. Simulation and cfd analysis of heat pipe heat exchanger.
To demonstrate the feasibility of a heatpipe forced convection cooler. Investigation of heat pipe heat exchanger effectiveness and energy. As a kind of heat exchanger, heat pipe heat exchanger hp heat exchanger often has a rectangular shell with many finned heat pipes mounted inside. As the name suggests, it consists of two pipes, one within the other. Heat pipe heat exchanger hphe considers one of the most useful devices for the recovery of waste heat energy. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. The sondex spiral heat exchanger is a circular heat exchanger with two spiral channels, each in one closed chamber ensuring that what comes in also comes out. Research article heat transfer of nanofluid in a double. The hot and cold fluids enter at the opposite ends. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. The doublepipe heat exchanger is one of the simplest types of heat exchangers. Heat exchange involve convection in each fluid and. Due to the high heat transport capacity, heat exchanger with heat pipes has become much smaller than traditional heat exchangers.
Analysis of heat transfer and flow patterns in a loop heat pipe. Different types of heat exchangers in addition, the overall heat transfer equation for the exchanger must be solved simultaneously. Pdf heat pipe heat exchanger for heat recovery in air conditioning. Thermal conductivity and convective heat transfer have been studied for many of nano particles in water and eth ylene glycol. The temperature difference between the fluid and the wall varies along the length of the heat exchanger.
The term heat exchanger applies to all equipment used to transfer heat between two streams. 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. Heat pipes are used to transfer heat flow when the area of surface of heat input and heat output is not identical. Counter flow heat exchangers are the most efficient of the three types. The figure of the mesh of the double pipe heat exchanger with twisted tape is shown below. The thermal transfer in a heat pipe uses the evaporation of the liquid working fluid at the hot end the evaporator and the condensation of the vapor at the cold. 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 primary advantage of a hairpin or double pipe heat exchanger is that it can be operated in a true counterflow pattern, which is the most efficient flow pattern. Pipe heat exchanger an overview sciencedirect topics. A system according to an exemplary aspect of the present disclosure includes, among other things, a control unit and a heat pipe heat exchanger having a first heat pipe and a second heat pipe. 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. Heat pipe heat exchanger on sales quality heat pipe heat. Shell and tube heat exchangers platefin exchangers.
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. To demonstrate the feasibility of a heat pipe forced convection cooler. Heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. Energy efficient heat pipe heat exchanger for waste heat recovery in. Its widely used in chemical, energy, machinery, transportation, refrigeration, air conditioning and aerospace fields. The heat pipe heat exchanger used for gasgas heat recovery is.
The heat exchangers are the best known devices for this purpose. Hemmat of mechanical engineering, shahid bahonar university of kernlan, iran abstract the single phase flow and thermal performance of a double pipe heat. The heat exchanger shall be operated by persons who have studied the instructions in this manual and have knowledge of the process. In this configuration, no mixing of the hot and cold fluids needs to take place. Heat pipe heat exchanger energy recovery systems offer both cost and performance benefits over traditionally available heat exchanger technologies. 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 doublepipe construction. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. Lectures 19 applied heat transfer cm3110 1232019 3 t, outer bulk temperature t, inner bulk temperature l but. Convective heat transfer from the outer tube wall to the outside fluid. A typical heat pipe heat exchanger with continuous planar fins and a staggered equilateral triangular pitch of the tubes is subject to optimization from the point of. Lowtemperature flue gas heat exchanger based on microthermal tube array 2.
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