Heat pipe thermal buses were proposed to facilitate a con. In this study numerical simulation method was used to analyze the performance of the heat pipe. A heat pipe is a structure with very high thermal conductivity that enables the transportation of heat whilst maintaining almost uniform temperature along its heated and cooled sections. Heat pipes hardware m t l l i t b ith th i fmetal aluminum tube with grooves on the inner surface cold t ild extrusion grooves are filled with the working fluid water, ammonia, propylene, etc. Pdf basic principles of heat pipes and history researchgate. Also explore the seminar topics paper on heat pipe with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. A brief overview of the heat pipe history is given. The heat pipe is a selfcontained structure made out of a thinwall sealed tube lined on the inside with a wick which is saturated by a working fluid. An introductory guide to variable conductance heat pipe. Design considerations when using heat pipes electronics. Nov 11, 2015 the micro heat pipe offers increased downsizing and improved performance for all electronic devices.
This method has been used in the aerospace industry for about thr ee decades for supporting systemlevel design analysis. A loop heat pipe with coherent pores integrated to the heat source is considered as a calculation model in this paperfig. Flanges can be added on the outer surface for easy integration with instruments or radiators the flange is an integral part of the extrusion. If a heat pipe length is larger than 150 mm, at 5 oc it. The micro heat pipe offers increased downsizing and improved performance for all electronic devices. Copper fin with fan, cooling length 6080mm t heater. Various fluids are used in heat pipes and the selected fluid is based upon its saturation temperature and the temperature at. Manufacturing and experimental investigation of copper.
Often it is necessary to flatten a heat pipe to fit into a desired shape or. This new edition has been revised to include new information on the underlying. This new edition has been revised to include new information on the underlying theory of heat pipes and heat transfer, and features fully updated applications, new data sections, and updated. The principle of the heat pipe is an amazingly sim ple one. Unless otherwise indicated heat pipe diameter is circular. Evaporator temperature of heat pipe, measurement on.
Conductance heat pipe cchp, it is wise to start with the layout of a cchp. Bending the heat pipe will also affect the maximum power handling capacity, for which the following rules of thumb should be kept in mind. Heat pipes, 6th edition, takes a highly practical approach to the design and selection of heat pipes, making it an essential guide for practicing engineers and an ideal text for postgraduate students. Heater temperature, sensor is embedded between heater and evaporator section of heat pipe. Introduction heat pipe is a capillary twophase heat transfer device. It is a twophase heat transfer device that utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary forces developed in fine porous wicks to circulate the fluid. Measured heat pipe performance limits as a function of geometry, wick and vapor limits. Experimental results showed that the total heat resistance of the heat pipe using nanofluids was less than that of the heat pipe using di water at different filling ratios as shown in fig. Heat pipes are referred to as the superconductors of heatdue to their fast transfer capability with low heat loss. Thermomhydrodynamics of closed loop pulsating heat pipes. It doesnt cover newer heat pipe variations, such as pressure controlled heat pipes and variable conductance heat. Various fluids are used in heat pipes and the selected fluid is based upon its saturation temperature and the temperature at which the heat pipe will be functioning. A heat pipe is a device that effortlessly transports thermal energy from its one point to the other.
The main attractive feature is its capacity to transfer heat better than the best metallic conductors, such as silver or. Us45574a us06598,714 us59871484a us45574a us 45574 a us45574 a us 45574a us 59871484 a us59871484 a us 59871484a us 45574 a us45574 a us 45574a authority us united states prior art keywords stainless steel screen titanium screen wick wick prior art date 19840411 legal status the legal status is an assumption and is not a legal conclusion. There are three sections of a basic heat pipe with a working fluid enclosed inside the pipe. Heat pipe based emergency cooling system for removing. This book provides a practical study of modern heat pipe engineering, discussing how it can be optimized for use on a wider scale. Heat pipe science and technology 1995 edition open library. Heat pipes do not actually dissipate the heat to the environment, but serve to move heat efficiently within a thermal system. A heat pipe heat exchanger is a simple device which ismade use of to transfer heat from one location to another,using an evaporationcondensation cycle. Vapour pressure limit at low operating temperatures, viscous forces may be dominant for the vapour moving flow down the heat pipe. Heat pipe is a special type of heat exchanger that can transfer large amount of heat by phase change of working fluid and capillary action. How to model a heat pipe a brief explanation is provided of a networkbased method that is suitable for modeling constant conductance heat pipes cchps, also called fixed conductance heat pipes or fchps and vapor chamber fins. Heat pipe is a capillary twophase heat transfer device. Flattening is another aspect of heat pipes that effect their performance.
A numerical model based on navier stokes equation, energy equation and conjugate heat. It doesnt cover newer heat pipe variations, such as pressure controlled heat pipes and variable conductance heat pipes, or loop heat pipes lhps. It covers all of the basics, which havent changed since the book was written. The entrainment limit is often associated with low or moderate temperature heat pipes with small diameters, or high temperature heat pipes when the heat input at the evaporator is high 4. Heat pipe design handbook, volume 1 internet archive.
Heat pipe advanced radiator element consisting of a 50ft. It is a common practice to include a slight excess of working fluid. Heat up the heating end of the heat pipe emperature 700c and dissipate 5 6. International journal of science, engineering and technology. Project description by means of knowledge about the theory of heat pipes, one is now able to carry out a basic calculation of a heat pipe. Heat pipes are recognised as one of the most efficient passive heat transfer technologies available. Heat pipe performance is governed by several parameters such as the geometry, dimensions, working fluid, wick and container materials etc. Thermomechanical design and characterization of flexible.
Performance of heat pipe for different working fluids and fill ratios journal of mechanical engineering, vol. The amount of heat transfer decrease depends on the particular heat pipe. The heat pipe is one of the remarkable achievements of thermal physics and heat. The application of heat pipes should be considered when the thermal design is either conduction limited or when nonthermal goals such as weight cannot be achieved with other materials such as solid aluminum andor copper. Physical characteristics of the heat pipe were chosen from previous studies at uc berkeley8. Explore heat pipe with free download of seminar report and ppt in pdf and doc format. Search the history of over 431 billion web pages on the internet.
Transports heat from a heat source to a heat sink works as an isothermalizer why twophase thermal system. Amir faghri written to cover simple, intermediate, and advanced approaches to the theoretical and experimental analysis of heat pipes, this second edition emphasizes the physics and mathematics of heat pipes as well as the related technological and experimental issues. Heat pipe is a closed evaporatorcondenser device that can transfer heat much quickly from one point to another, which is normally used to cool the components and modules in led, lighting, computer and data processing, consumer electronics and power electronics, electric utility, semiconductors, telecommunications, transportation, aerospace and. A practical approach provides a practical study of modern heat pipe engineering in nuclear and solar energy applications. The amount of heat transfer decrease depends on the particular heat. Pdf on jan 1, 2016, stephane lips and others published overview of heat pipe. The loop heat pipe lhp was invented in russia in the early 1980s. Heat pipe selection guide pdf heat pipe basics and demonstration. Beginning with a definition of the problem, including the temperature. Allows direct contact with heat source 1piece vapor chamber 10mm bend radius along.
Figures 6 and 7 are photo illustrations of these heat pipe clamps as a separate assembly and as installed in the spacecraft. Haringx 10 modeled the bellow as the combination of annular plates connected by elastic cylinders and derived. Packed with examples and design information, it takes you through the background and. A heat pipe is a copper tube with an internal wick structure that is sealed on both ends with a small amount of water inside.
In its basic form, the heat pipe consists of a sealed tube, lined. The result is less pumping of the wick with reduced heat transfer. An essential guide for practicing engineers and an ideal text for postgraduate students, the book takes a highly practical approach to the design and. Heat pipes are used in a wide range of applications, including electronics cooling, diecasting and injection moulding, heat recovery and energy conservation, deicing and manufacturing process temperature control, and in domestic appliances. It can transfer thermal energy about times than copper, the best known conductor. Ats engineering ebook advanced thermal solutions, inc.
According to gaugler, the objective of his invention was to cause absorption of heat, or in other words evaporation of the liquid to a point above. Heat pipe control rod evaporator 180water 280vapor vapor dryer vapor separator water spurger top plate core shroud vent control rod fuel jet pump circulation pump 5,400kw a a vapor liquid heat pipe vapor 282. Nov 25, 2016 heat pipe science and technology, second edition by dr. It emphasizes the physical aspects of heat pipe behavior and develops design formulas on the basis of mathematical models and empirical observation. The graph also shows that if the heat pipe is operated against the force of gravity, the liquid undergoes a larger pressure drop. A heat pipe is a heattransfer device that combines the principles of both thermal conductivity. Pdf overview of heat pipe studies during the period 20102015. Copper dummy heater, heat source area 15x w mm condenser. If a heat pipe length is less than 150 mm, at 40c it passes. This page contains heat pipes seminar and ppt with pdf report. If you are just getting interested in heat pipes, dunn and reay is an excellent starting point. Director of act, a few years later describes the theory and history of the heat pipe technology in.
However, in an actual application when a heat pipe is soldered or epoxied to the base of a heat sink, the effective thermal conductivity of the heat pipe may be. It is a common practice to include a slight excess of working fluid over and above that required to saturate 147. Many investigations have been performed concerning heat pipe operating limits, heat pipe applications and design modifications to. The heat pipe is one of the remarkable achievements of thermal. The entire process only makes use of three major components including the container the pipe, the working fluid inside the pipe and the thermosyphon effect. Design and technology of heat pipes for cooling and heat exchange crc press book this book describes the characteristics of heat pipes under steadystate and transient operating conditions. The heat pipe is a highperformance heat transfer device, able to transfer heat at high rates, over considerable distances, with almost no temperature drop. Design considerations when using heat pipes electronics cooling. Loop heat pipe with coherent porous wick since the porous material used for current heat pipes is usually stochastic structure, it is hard to apply analytical or numerical methods for design optimization. Jun 18, 20 a heat pipe heat exchanger is a simple device which ismade use of to transfer heat from one location to another,using an evaporationcondensation cycle. Advanced cooling technologies yale eastman currently a director of act, a few years later describes the theory and history of the heat pipe technology in an article published in. Heat pipe 1piece vapor chamber 2piece vapor chamber 20 heat pipes bend radius 3x diameter of heat pipe. Numerical simulation of a cylindrical heat pipe and.
Dick jansson, kd1k, ex wd4fab and wa1qli, arrl technical. Your complete resource on heat pipe operation, behavior, performance characteristics, and limitations this book is designed to help students, operations engineers, and mechanical and electrical engineers in the electronic packaging industry grasp the principles of operation for a wide range of heat pipes. Qmax customer requirement then heat pipe is passed test frequency. Evaporator temperature of heat pipe, measurement on heat pipe top side. Ultimate heattransfer limitations imposed by sonic vapor flow were determined in heat pipes for sodium, potassium, and cesium working fluids.
It applies the implied heat of the vaporized working fluid instead of the reasonable heat. If heat pipe pa take out and let ai below sol end of a heatp ipe 1015 mm. Heat pipes and its applications lunds tekniska hogskola. Heat pipes seminar ppt with pdf report study mafia. How to model a heat pipe heat transfer and fluid flow.
A new frontier of nanofluid research application of. Nano heat pipe heat pipes with nano fluid as working fluid can be referred as nano heat pipe the heat transfer capability of the all heat transfer devices including heat pipe is limited by the working fluid transport properties. Advanced cooling technologies yale eastman currently a director of act, a few years later describes the theory and history of the heat pipe technology in an article published in scientific american, may 1968. The thermal performance of this complete highpower coupling of transmitter transisfigure 4 ao40 heat pipe extrusion cross section. Heat pipe science and technology, an international journal is encompassed on publishing i fundamental studies of heat and mass transfer in heat pipes and twophase thermosyphons, ii new streams of technology development, iii industrial innovation in electronic thermal control, air conditioning, heating and cooling, aerospace thermal control. Hence, other than thermal design of the heat pipe, mechanical design of the.
Efficient heat transferefficient heat transfer boiling and condensationboiling and condensation small temperature difference between the heat source and. The use of the nanofluids made the heat resistance reduce by an average of 40%. Currently, a popular application to use heat pipes is cooling intels pentium processors in notebook computers. The heat pipe temperature reaches the water temperature in about 25 seconds, while the copper rod reaches just 30c after 200 seconds.