Computation of flow and heat transfer in a heat pipe is complicated by the strong coupling among the velocity, pressure and temperature fields with phase change at the interface between the vapor and wick. The heat pipe is one of the remarkable achievements of thermal physics and heat transfer engineering in this century. Design and manufacturing of loop heat pipes for electronics cooling. Experiments were conducted with and without working fluid for. 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. An experimental study on applying miniature loop heat pipes for. Beginning with a definition of the problem, including the temperature. Final report, high temperature liquid metal loop design. But during steady state operation, the maximum heat transport capability of a heat pipe is governed by several limitations, which. To assist with reactor licensing, siting, microgrid interface and remote monitoring, westinghouse has engaged southern company services as a key. Experimental analysis of heat transfer behavior inside.
Westinghouse electric company llc the evinci micro reactor. If a heat pipe length is less than 150 mm, at 40c it passes. 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. Haringx 10 modeled the bellow as the combination of annular plates connected by elastic cylinders and derived. This page contains heat pipes seminar and ppt with pdf report.
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. A bench top test bed is designed that investigates various, common mixtures for longterm energy storage by stored chemical energy. In this communication, we discuss a theoretical description of the vapor phase thermodynamics in the pulsating heat pipe php, to be used in the. Pdf heat pipe cooling is widely used in computer processors. Allows direct contact with heat source 1piece vapor chamber 10mm bend radius along. The international journal of energy research is dedicated to providing a multidisciplinary platform for the discussion of issues arising in energy research without the constraints imposed by aiming at a restricted audience. Thermal performance evaluation of a small loop heat pipe for space applications.
It utilizes the latent heat of the vaporized working fluid instead of the sensible heat. Mvk160 heat and mass transfer may 7, 2012, lund, sweden heat pipe, selection of working. Abstract the recent department of transportation advisory bulletin, notification of the susceptibility to premature brittlelike cracking of older plastic pipe cited lower ductile inner wall aldyl a and century polyethylene pe pipe as two materials that were known to be susceptible to brittlelike cracking or slit failures. Influence of residual stress and heat affected zone on. Show full abstract lockheed who has also worked for westinghouse and the u.
Ms reports are informal documents, usually prepared for a special purpose and. The hardy cross method works well for hand calculation but experiences slow convergence for large circuit, the network analysis method has been widely used in thermal analysis codes sindag 2 and sindafluint 3 using an electric analog. Pdf overview of heat pipe studies during the period 20102015. It aims to reach all researchers, scientists, engineers, technology developers, planners and policy makers working in the. Heat pipe thermal buses were proposed to facilitate a con. Heat pipes seminar ppt with pdf report study mafia. Pdf heat pipes are becoming increasingly popular as passive heat transfer technologies due to their high efficiency. Twopipe originated 50 or 60 years ago as a costeffective way to add air conditioning. A heat pipe with an outer diameter of 6 mm can transfer between 20 and 50 w per pipe 7,8. The heat pipe device had been divided into 2 samples of specimens. Efficient heat transferefficient heat transfer boiling and condensationboiling and condensation small temperature difference between the heat source and. The report describes a preliminary design study of a heat pipe thermionic reactor concept and.
An attempt is made to design, fabricate and test a miniature heat pipe with 5 mm diameter and 150 mm length with a thermal capacity of 10 w. Heat pipe is a capillary twophase heat transfer device. Heat pipe advanced radiator element consisting of a 50ft. 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. Heat pipes are widely used in many industrial applications. A heat pipe is a device that efficiently transports thermal energy from its one point to the other. Additionally, westinghouse is working closely with idaho national laboratory inl to qualify the fuel and to perform site assessments to host the ndu. First specimen of heat pipe using air whiles the one used other water as the working fluid. Manufacturing and experimental investigation of copper heat pipes. The heat pipe temperature reaches the water temperature in about 25 seconds, while the copper rod reaches just 30c after 200 seconds. Abstract this paper provides some insights into using powder bed fusion pbf techniques for additively manufacturing heat transfer equipment hte, such as heat pipes and heat sinks. Heat pipe 1piece vapor chamber 2piece vapor chamber 20 heat pipes bend radius 3x diameter of heat pipe. Outside diameter od remains same for a given size irrespective of pipe thickness. Therefore, to increase the heat dissipation considerably, the cooler must have either additional heat pipes or an increased.
The proposed heat pipe heat exchangers show a good thermal response and could be used to heat and desorb the porous sorbent bed up to 300c and to cool down again to the ambient temperature due. Transports heat from a heat source to a heat sink works as an isothermalizer why twophase thermal system. It is a common practice to include a slight excess of working fluid over and above that required to saturate 147. Hence, other than thermal design of the heat pipe, mechanical design of the. Heat pipes are referred to as the superconductors of heatdue to their fast transfer capability with low heat loss. Low temperature energy captured by heat pipe is converted into chemical energy which is stored by separation of acid and salt solutions by means of evaporation. A dual pipe heat pipe builds the inner coaxial pipe in the adiabatic section of a common heat pipe. Heat pipe design handbook, volume 1 internet archive. Heat exchanger is a device for transferring heat from one medium to another. As a result, the effective thermal conductivity may be several orders of magnitudes higher than that of the good solid conductors. Heat pipes for high temperature thermal management advanced. Thermal performance evaluation of a small loop heat pipe for. Ultimate heattransfer limitations imposed by sonic vapor flow were determined in heat pipes for sodium, potassium, and cesium working fluids. A heat pipe is a selfcontained structure which achieves very.
Thermomechanical design and characterization of flexible. It applies the implied heat of the vaporized working fluid instead of the reasonable heat. 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 tracing systems abstract the term heattracing refers to the continuous or intermittent application of heat on the piping, equipment, and instrumentation where fluid water or other product may be exposed to low temperaturefreezing conditions. Thermomhydrodynamics of closed loop pulsating heat pipes. The result is less pumping of the wick with reduced heat transfer.
Pdf basic principles of heat pipes and history researchgate. Heat transfer and heat pipe effect in carbon papers in carbon papers, the carbon. Ats engineering ebook advanced thermal solutions, inc. The graph also shows that if the heat pipe is operated against the force of gravity, the liquid undergoes a larger pressure drop. A loop heat pipe with coherent pores integrated to the heat source is considered as a calculation model in this paperfig. Remote fin stacks heat exchangers are a perfect example as with any heat pipe heat sink design, size the heat pipe with an additional 25% thermal headroom if youre interested in spreading heat to reduce hot spot andor attach to a local heat exchanger the ratio of heat spreader to heat source should be on the order of 20. Vapor thermodynamics and fluid merit for pulsating heat pipe.
It is a device that is used to transfer thermal energy from one body or fluid stream to another. Decimal numeric field with 2 decimal places 23 total urban taxable value decimal numeric field with 2 decimal places 24 total agricultural taxable value decimal numeric field with 2 decimal places 25 total residential taxable value decimal numeric field with 2 decimal places. The amount of heat transfer decrease depends on the particular heat pipe. Influence of residual stress and heat affected zone on fatigue failure of welded piping joints. International journal of energy research wiley online library. Pdf heat pipe based systems advances and applications.
If heat pipe pa take out and let ai below sol end of a heatp ipe 1015 mm. The combination of trace heating and the thermal insulation, appropriate to the ambient operating temperature, maintains a thermal balance where the heat output from the trace heating matches the heat loss from the pipe. Numerical analysis of phase change, heat transfer and. Abstract a 2 pipe hvac system is one that uses the same piping alternately for hot water heating and chilled water cooling, as opposed to a 4 pipe system that uses separate lines for hot and chilled water. This application is relevant to prevent pipe blockage. 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. Pdf an experimental study of heat pipe performance using. Abstract a 2pipe hvac system is one that uses the same piping alternately for hot water heating and chilled water cooling, as opposed to a 4pipe system that uses separate lines for hot and chilled water. Background information is provided on the operating principles of pbf and the subsequent features of parts fabricated via pbf. If a heat pipe length is larger than 150 mm, at 5 oc it passes. 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. Concentric tube heat exchanger model and heater application 1.
Individual images could be stored on a pcmcia card in a bit map format and. In recent decades, some unexpected fatigue failure occurred in welded joint of metal structures under cyclic loading. Therefore, it is important to assure that the heat pipe is designed to transport the required heat load safely. The new concept of influence of vibrations on processes in heat pipes is offered. A practical approach provides a practical study of modern heat pipe. Review article factors affecting the thermal performance of. Heat exchanger seminar ppt with pdf report heat exchangers are found widely scattered throughout the food process industry. Users manual for heat pipe fluid properties program. Show full abstract actions on heat and mass transfer of all three zones of heat pipes are given. Process piping fundamentals, codes and standards module 1. Explore heat pipe with free download of seminar report and ppt in pdf and doc format. Heat pipes and its applications lunds tekniska hogskola.
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