Abstract mathematical modeling of pulsating heat pipes through first principles is a contemporary problem which. Modeling of compressible flow with friction and heat transfer using the generalized fluid system simulation program gfssp. Jul 22, 2019 this paper describes the experimental investigations conducted on a closed loop pulsating heat pipe clphp for assessing the thermal performance. Journal of environmental quality abstract heat transfer models for a subsurface, water pipe, soilwarming system 1. A rule of thumb for the effective thermal conductivity of a heat pipe is 4000 wmk. Abstract as the demand for high performance small electronic devices has increased, heat removal from these devices for space use is approaching critical limits. Experimental investigations on the thermal performance of a. Abstract and attributes of asme vessel heat transfer surfaces abstract and attributes of asme vessel heat transfer surfaces thermal heat exchange surfaces are utilized on vessels for controlling temperature and quality of the contents of the vessel. They investigated the effectiveness of the heat pipe thermal conductivity in a transient state during startup of the pipe operation and during temperature increases. Show full abstract actions on heat and mass transfer of all three zones of heat pipes are given.
An equation was derived for the calculation of heat and mass transfer coefficients in the case of pipe and channel flow, taking into account the experimental data for high reynolds and prandtl numbers. Mvk160 heat and mass transfer may 7, 2012, lund, sweden heat pipe, selection of working. The system performance is tested and compared under two working modes, heating mode and heat charging mode, which provides a reference for the operation regulation and performance optimization of the heat pipe pvt heat pump system. The vapor pressure decreases as it flows from the evaporator to the condenser. Thus, the purpose of this research project is to design, analyze, and optimizes a microsized heat pipe. The interior of the pipe is covered with a wick, and the pipe is partially filled with a liquid such as water. 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. Abstract there have been surprisingly few studies dealing with the mechanism of heat loss. Experimental investigation of solar panel cooling by a.
Journals frontiers in heat pipes fhp thermalfluids central. Study on heat transfer characteristics of reservoir. Explore heat pipe with free download of seminar report and ppt in pdf and doc format. Modeling of compressible flow with friction and heat. Heat pipes hps have received considerable attention in recent. Effective thermal conductivity of metalfiber wicks in heat pipes, authors abstract of candidates dissertation, technical sciences, kiev 1978. The integration of heat pipe technology into natural. Currently, heat pipes are usually made of copper, aluminum or stainless steel. A loop heat pipe with coherent pores integrated to the heat source is considered as a calculation model in this paperfig. 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. The pulsating heat pipe has a single closed loop made of copper. Kilopower system, which has an operable range of 1 to 10 kwe and a design life of 8 to 15 years. Efficient heat transferefficient heat transfer boiling and condensationboiling and condensation small temperature difference between the heat source and.
Heat pipes seminar ppt with pdf report study mafia. A number of theoretical studies and experimental investigations have been carried out. The spr design recently developed within a collaboration between. At any cross section of the heat pipe, a pressure differential exists between the vapor and liquid phases. In this report, both parts are considered separately. Heat pipe thermal buses were proposed to facilitate a con. Heat pipe applies the principle of evaporation and condensation of fluid to transfer heat. Design calculation and heat transfer analysis of heat pipe. The heat pipe is one of the remarkable achievements of thermal physics and heat transfer engineering in this century. 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.
Ats engineering ebook advanced thermal solutions, inc. Performance testing of a heat pipe pvt heat pump system. This paper presents the thermal performance of a lowcost loop heat pipe lhp consisting of a single evaporator and a single condenser. Recent developments in heat pipe technology and applications. Compared with the ordinary solar panel, the maximum difference of the photoelectric conversion efficiency is 2. Beginning of a dialog window, including tabbed navigation to register an account or sign in to an existing account. Abstract and attributes of asme vessel heat transfer surfaces abstract and attributes of asme vessel heat transfer surfaces. A detailed overview of heat pipes is presented in this paper, including a historical perspective, principles of operations, types of heat pipes, heat pipe performance characteristics, heat pipe limitations, heat pipe frozen startup and shutdown, heat pipe analysis and simulations, and various applications of heat pipes.
Combined friction and heat transfer in the convergingdiverging nozzle. The heat pipe is a very efficient means of transferring heat from within the evacuated tube to the water. This article experimentally investigates the thermal performances of a heat pipe with phase change material for electronic cooling. Gershunin, basic characteristics of heat transfer processes in lowtemperature heat pipes with metalfiber wicks, authors abstract of candidates dissertation, technical sciences, kiev 1977. Design and demonstration of a heat exchanger for a compact. The study used numerical and experimental techniques identified from literature to carry out the research. The aim of this research was to integrate heat pipe technology into natural ventilation air streams to provide passive cooling in regions of hot arid climatic conditions without the use of mechanical assistance. Roadmap to realistic modeling of closed loop pulsating heat pipes. Both of aircooling and watercooling conditions under nature convection condition were investigated in this paper. The liquid pressure decreases as it flows from the condenser to the evaporator. Abstract a novel micro heat pipe array was used in solar panel cooling. This paper experimentally studied the heat transfer property of heat pipe influenced by integrated cooling.
Experimental investigations on the thermal performance of. The equation is valid for the transition region and for. Huntsville, alabama 35762 huntsville, alabama 35812 abstract the present paper describes the verification and validation of a quasi onedimensional. The thermal management system of kilopower system involves two types of heat pipes.
Heat pipes full seminar reports, pdf seminar abstract, ppt, presentation, project idea, latest technology details, ask latest information. Heat pipe with discrete heat transfer property is often called thermal superconductor because it has extremely large thermal conductivity. As a result, the effective thermal conductivity may be several orders of magnitudes higher than that of the good solid conductors. Thermomechanical design and characterization of flexible. The new concept of influence of vibrations on processes in heat pipes is offered. Jessica holmes calvin lam bradford marx andrew nelson. Beginning with a definition of the problem, including the temperature. Heat pipes are one of the most effective procedures to transport thermal energy from one point to another, mostly used for cooling. Journals frontiers in heat pipes fhp thermalfluids. Titaniumwater heat pipe radiators for space fission power. The heat pipe is simply inserted into the glass tube, held in place with high quality silicon based cap. Hence, other than thermal design of the heat pipe, mechanical design of the.
If there is a deficiency of working fluid, the heat pipe may fail because of the inability of any artery to fill. Analyzing the heat transfer property of heat pipe influenced. Flat plate oscillating heat pipe fpohp is a unique heat transfer device and considered as a promising candidate for effective heat transfer device in electronics industries. It applies the implied heat of the vaporized working fluid instead of the reasonable heat. Roadmap to realistic modeling of closed loop pulsating. A loop heat pipelhp with coherent micronporous evaporative wick is suggested to enhance the. Pressure balance in heat pipes the fluid flow will induce a frictional pressure drop. Heat pipes full seminar report, abstract and presentation download.
A heat pipe is a device that efficiently transports thermal energy from its one point to the other. Pdf basic principles of heat pipes and history researchgate. Abstract interest in the use of heat pipe technology for heat recovery and energy saving in a vast range of engineering applications has been on the rise in recent years. A typical heat pipe consists of a sealed pipe or tube made of a material that is compatible with the working fluid such as copper for water heat pipes, or aluminium for ammonia heat pipes.
The adiabatic section of heat pipe is covered by a storage container with phase change material pcm, which can store and release thermal energy depending upon the heating powers of evaporator and fan speeds of condenser. Haringx 10 modeled the bellow as the combination of annular plates connected by elastic cylinders and derived. Heat pipesconcepts, materials and applications sciencedirect. Dynamics of a sodium heat pipe reforming reactor richardson. Variable conductance heat pipe, rotating heat pipe, loop heat pipe, micro heat pipe, nanofluids. Heat pipes are very flexible systems with regard to effective thermal control. The proposed work is focused on addressing this main safety concern, by means of experiments and highfidelity simulations. Heat pipes are simple heat transfer devices with high, effective thermal. Combined friction and heat transfer in a constant area pipe. Design and demonstration of a heat exchanger for a compact natural gas compressor major qualifying project report submitted to the faculty of worcester polytechnic institute in partial fulfillment of the requirements for the degree of bachelor of science of mechanical engineering submitted by.
Heat pipes are referred to as the superconductors of heatdue to their fast transfer capability with low heat loss. For future space transportation and planetary exploration mission power applications, nasa glenn research center grc is currently developing a smallscale nuclear fission system i. The total pressure drop over the length of the heat pipe is the sum of individual pressure drops. The method of images is used to calculate the heat loss from a hot water pipe buried at a given depth below the surface of a homogeneous soil with a constant soil surface temperature. Heat production has received more than its share of consideration because it is really the balance between production and loss that determines the body temperature.
Heat pipes are playing a more important role in many industrial applications. 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 drastically reduced due to the extra thermal resistances added by the bonding. Faculty of mechanical and manufacturing engineering. To demonstrate the feasibility of a heatpipe forced convection cooler. Abstract heat sinks are devices that are used to enhance heat dissipation from hot. Abstract and attributes of asme vessel heat transfer surfaces. Characteristics of diodetype heat pipe in forward mode and in reverse mode of operation. Heat transfer from the heat sink consists of radiation and convection from both the intrafin passages and the unshielded surfaces of two outer fins.
Heat pipe advanced radiator element consisting of a 50ft. New equations for heat and mass transfer in the turbulent. Originally developed and patented by hisateru akachi in 1990, ohps consist of a long meandering tube which is heated and cooled at. A heat pipe is a heattransfer device that combines the principles of both thermal conductivity.
Both experimental and model simulation data were obtained. Half pipe heat transfer surfaces can contain the entire vessel or part of the vessel depending on the application. Another drawback of excess fluid is peculiar to heat pipes in space, where in zero gravity the fluid can move about the vapour space, affecting the dynamics of the spacecraft. Due to their relatively high density and limited heat transmission capacity, heat pipes are facing urgent challenges in power electronics and power modules.
This page contains heat pipes seminar and ppt with pdf report. When the evaporator section le is exposed to a heat source, the liquid inside vaporizes and the pressure in that section increases. Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively new development in the field of heat pipe technology. The authors used a heat pipe that was 200 mm long with 4 mm diameter and 25 mm. In this paper, a heat pipe pvt heat pump system is designed and the testing rig is constructed as well. It utilizes the latent heat of the vaporized working fluid instead of the sensible heat. Design of a miniaturized nanofluid pulsating heat pipe. Performance of heat pipe for different working fluids and fill ratios journal of mechanical engineering, vol. Abstract heat pipe is the apparatus which is very much in talk as a heat transfer device in the recent scenario of heat transmission efficiently. Heat pipe is one of the most efficient tools for heat dissipation in electronics and power systems. In order to optimize the transportation of natural. Journal of environmental quality abstract heat transfer. 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.
A heat pipe is a device that effortlessly transports thermal energy from its one point to the other. 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. A deployable radiator is one of the key technologies for a high. As the demand for high performance small electronic devices has increased, heat removal from these devices for space use is approaching critical limits. There have been surprisingly few studies dealing with the mechanism of heat loss. The heat pipe is a twophase cooling solution, offering very high thermal. A lightweight and high thermal performance graphene heat pipe. The equation is valid for the transition region and for the range of fully developed turbulent flows. Heat and mass transfer analysis in unsaturated ground soils around the buried heating pipe journal of thermal science and technology 2015 10. Abstract a prototype of a sodium heat pipe reactor for steam reforming processes has been developed and tested at energy levels up to 6 kw. Experimental study of exergetic performance of al 2 o 3 nanofluid in a double. Experiments and computations to address the safety case of. 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. Heat exchange surfaces can be designed for heating or cooling.
The heat pipe transfers the heat to the manifold by a very simple method. Pdf heat pipe in modern heat exchangers researchgate. Originally developed and patented by hisateru akachi in 1990, ohps consist of a long meandering tube which is heated and cooled at various points along its length. The objective of this research is to investigate the heat transfer analysis of heat pipe evacuated tube solar collector is made of borosilicate glass with length 1. Effect of friction and area change using an adiabatic convergingdiverging nozzle. Rayleigh flow flow with heat transfer in a frictionless constant area pipe. This special heat transfer property is destroyed by integrating cooling apparatus and further reducing the cooling power of a heat pipe cooler.
Heat pipe with pcm for electronic cooling sciencedirect. Introduction heat pipe is a capillary twophase heat transfer device. The heat pipe concept the heat pipe is an innovative device capable of transferring large quantities of heat through rela as indicated in fig. Transports heat from a heat source to a heat sink works as an isothermalizer why twophase thermal system. Modeling of compressible flow with friction and heat transfer. This paper describes the experimental investigations conducted on a closed loop pulsating heat pipe clphp for assessing the thermal performance. Thus far, largescale nanofluid pulsating heat pipes have been developed.
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