Bibliographies thématiques / Primary Heat Transfer System

Littérature scientifique sur le sujet « Primary Heat Transfer System »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Primary Heat Transfer System"

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Liu, Zhe, Peng Fu, Lei Yang, Bin Guo, Lili Zhu, Weibao Li et Jinxuan Zhou. « Conceptual design of primary heat transfer system for CFETR power extraction system ». Fusion Engineering and Design 170 (septembre 2021) : 112395. http://dx.doi.org/10.1016/j.fusengdes.2021.112395.

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Terranova, Nicholas, et Luigi Di Pace. « DEMO WCLL primary heat transfer system loops activated corrosion products assessment ». Fusion Engineering and Design 170 (septembre 2021) : 112456. http://dx.doi.org/10.1016/j.fusengdes.2021.112456.

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Zhou, Jinxuan, Lei Yang, Bin Guo, Lili Zhu, Weibao Li, Zhe Liu, Lidong Yao et Qianglin Xu. « Concept design of primary heat transfer system for CFETR vacuum vessel ». IOP Conference Series : Earth and Environmental Science 480 (29 avril 2020) : 012017. http://dx.doi.org/10.1088/1755-1315/480/1/012017.

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Misra, R. S. « Methods for Improving Thermodynamic Performance of Vapour Compression Refrigeration Systems Using Nano Mixed Ecofriendly Refrigerants in Primary Circuit and Comparsion with Nano Particles Mixed Wih R718 Used in Secondary Evaporator Circuit and Ecofriendly ». International Journal of Advance Research and Innovation 3, no 2 (2015) : 165–74. http://dx.doi.org/10.51976/ijari.321532.

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The use of nano particles mixed refrigerants in a primary circuit in vapour compression refrigeration systems and used of nano particles mixed with R718 in the secondary evaporator circuit was studied in detail and computational system model was developed for solving the non linear heat transfer equations of the system. The effect of brine mass flow rate on the overall evaporator heat transfer rate and first and second law performances of VCRS have been investigated. It was observed that C.O.P enhancement about 8-28 % in the nanoparticles mixed refrigerants in a primary circuit and nanoparticles mixed refrigerants in the R718 and used in a secondary circuit is from 8% to 20% with evaporator heat transfer rate increasing is double as compared without nanoparticles in the secondary circuit due to its thermo-physical properties increases in the system.
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Si, Qiang, Jianjun Wei et Yuan Li. « Experimental study of condensation characteristics and operation strategies of induction radiant air-conditioning system ». IOP Conference Series : Earth and Environmental Science 1101, no 7 (1 novembre 2022) : 072001. http://dx.doi.org/10.1088/1755-1315/1101/7/072001.

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Abstract To study the operation and condensation characteristics of an induction radiant air-conditioning system as a novel system that combines induction ventilation and radiant air conditioning, the characteristics of convection and condensation of an indoor terminal device radiant induction unit were studied. The mass transfer coefficient, condensation temperature, and condensation rate were analyzed experimentally. The time required to achieve a steady state indoor thermal environment was collected. The results indicated that the primary airflow rate and temperature mainly affected the mass transfer coefficient, condensation temperature, and condensation rate. When the indoor thermal environment reached a steady state, the heat transfer performance of the radiant induction unit was mainly affected by the primary air temperature. When condensation occurred, the primary airflow rate had a greater influence on the condensation rate. The start-up and response performances of the system were better than those of a traditional radiant air-conditioning system. In the condensation condition, reasonable control strategies maintain the primary air temperature and adjust the primary air flow rate, which can ensure sufficient heat transfer and stabilize the indoor thermal environment faster.
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Singh, Paritosh. « Performance Analysis of Shell and Tube Type Heat Exchanger Using Aluminium Oxide (Al2O3) Nano-Particle ». International Journal for Research in Applied Science and Engineering Technology 9, no 9 (30 septembre 2021) : 157–64. http://dx.doi.org/10.22214/ijraset.2021.37944.

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Abstract: Research in convective heat transfer using suspensions of nanometer sized solid particles in a base fluid started only over the past decade. Recent investigations on nanofluids, as such suspensions are often called, indicate that the suspended nanoparticles markedly change the transport properties and heat transfer characteristics of the suspension. The very first part of the research work summarizes about the various thermo physical properties of Al2O3 Nanofluid. In evacuated tube solar water heating system nanofluids are used as primary fluid and DM water as secondary fluid in Shell and Tube Heat Exchanger. The experimental analysis of Shell and Tube heat exchanger integrated with Evacuated tube solar collector have been carried out with two types of primary fluids. Research study of shell and tube heat exchanger is focused on heat transfer enhancement by usage of nano fluids. Conventional heat transfer fluids have inherently low thermal conductivity that greatly limits the heat exchange efficiency. The result of analysis shows that average relative variation in LMTD and overall heat transfer coefficient is 24.56% and 52.0% respectively. The payback period of system is reduced by 0.4 years due to saving is in replacement cost of Evacuated Tube Collector. Keywords: ETC; Nanofluid; LMTD; Thermal Conductivity; Overall heat transfer coefficient
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Martelli, Emanuela, Fabio Giannetti, Gianfranco Caruso, Andrea Tarallo, Massimiliano Polidori, Luciana Barucca et Alessandro Del Nevo. « Study of EU DEMO WCLL breeding blanket and primary heat transfer system integration ». Fusion Engineering and Design 136 (novembre 2018) : 828–33. http://dx.doi.org/10.1016/j.fusengdes.2018.04.016.

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Moscato, I., L. Barucca, S. Ciattaglia, P. A. Di Maio et G. Federici. « Preliminary design of EU DEMO helium-cooled breeding blanket primary heat transfer system ». Fusion Engineering and Design 136 (novembre 2018) : 1567–71. http://dx.doi.org/10.1016/j.fusengdes.2018.05.058.

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Popov, Emilian, et Alice Ying. « Modeling and Simulation of the ITER First Wall/Blanket Primary Heat Transfer System ». Fusion Science and Technology 60, no 1 (juillet 2011) : 128–33. http://dx.doi.org/10.13182/fst11-a12339.

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Preda, Andrei, et Andrei Alexandru Scupi. « Energy Review on a Maritime Energy Transfer System for Comercial Use ». Advanced Materials Research 837 (novembre 2013) : 763–68. http://dx.doi.org/10.4028/www.scientific.net/amr.837.763.

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Despite the low energy and lower maintenance benefits of marine heat pump systems, little work has been undertaken in detailed analysis and simulation of such systems. This heat pump system is very attracting increasing research interests, since the system can be powered by thermal energy that can be provided by a renewable source: the difference of temperature between the ocean water layers.This paper focuses on the annual energy consumption and COP ( performance coefficent) of a marine heat pump system implemented for comercial use. This unconventional maritime systems of energy transfer would solve some of the pollution problems that arise from the use of conventional fuels . By using this system can make a pretty big energy savings in heating our homes and in preparation of hot water for domestic use.This energy consumption takes into account the heating and cooling needs of structure along different periods of time, such as winter and summer. Moreover, for each year period, we compared the heat pump efficiency simulated for our cost line with other tree tipes of heat pumps that are using diffrents primary agents. To highlight the performance of heat pump used for this study we coupled it with solar panels. The simulation, performed with TRNSYS (Transient Systems Simulation Program), was made for different working conditions simulating real conditions and temperature variations that occur in a year in the Black Sea coastal area.This experiment is intended to emphasize that marine energy potential that we have and also the advantages of using unconventional energy in relation to the use of classic fuels.This unconventional system of thermal energy conversion can be applied to both residential and commercial areas bringing an important benefit both people and the environment.
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Thèses sur le sujet "Primary Heat Transfer System"

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FROIO, ANTONIO. « Multi-scale thermal-hydraulic modelling for the Primary Heat Transfer System of a tokamak ». Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2704378.

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The EU DEMO reactor is currently in its pre-conceptual design phase by the EUROfusion Consortium members; it aims to be the first tokamak fusion reactor to demonstrate the capability to produce net electrical energy from fusion reactions. To this aim, it must prove tritium self-sufficiency, and so it will be the first tokamak to include a Breeding Blanket (BB), to breed tritium exploiting lithium and the neutrons coming from the fusion reactions. Moreover, to prove feasibility of fusion electricity, the EU DEMO reactor will also be the first to include the power conversion chain, converting the heat coming from fusion reactions into electrical energy, through a Primary Heat Transfer System, which removes the heat deposited in the components close to the plasma and delivering it to the Power Conversion System, that, in the end, produces electricity. Within this framework, a new computational tool is developed, supported by the EUROfusion Programme Management Unit. This code, called the GEneral Tokamak THErmal-hydraulic Model (GETTHEM), aims at fast, system-level, transient thermal-hydraulic modelling of the EU DEMO Primary Heat Transfer System and Balance-of-Plant (BoP), including all the in-vessel and ex-vessel cooling components, and it is the first system-level code of this type explicitly developed for fusion applications. The thermal-hydraulic models of the in-vessel components are developed, starting from the BB, as it is the most thermally loaded component and, consequently, the most important for the BoP. The GETTHEM development currently focuses on two out of the four BB concepts studied in the EU, namely the Helium-Cooled Pebble Bed (HCPB) and the Water-Cooled Lithium-Lead (WCLL) BB concepts. Considering that the EU DEMO is still in pre-conceptual design, the code focuses on execution speed, while maintaining an acceptable accuracy, typically modelling the different components as 0D/1D interconnected objects. GETTHEM is applied to analyse the coolant distribution in the HCPB BB, as well as the maximum temperature reached under normal operating condition in the structural material of both BB concepts, which must stay below 550 °C as a safety requirement. The model is capable to highlight if and where the coolant distribution in the HCPB BB should be optimized in order to avoid an overheating of the structures, allowing at the same time to reduce the compression power needed to circulate the coolant. It also can show if in some regions of the BB, for both coolant options, more detailed analyses are needed, as the current design, tailored on the equatorial BB region, somehow penalizes the regions far from the equatorial plane. Moreover, a separate module of the code is developed, aiming, through suitable simplifications, at fast modelling of accidental transients such as in-vessel Loss-Of-Coolant Accidents (LOCAs). Such module of the code is applied to the parametric analysis of an in-vessel LOCA for HCPB and WCLL, exploiting the code speed to rapidly screen the effect, for instance, of different break sizes, contributing to the proper sizing of the Vacuum Vessel Pressure Suppression System.
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Parker, Gregory K. « Heat transfer parametric system identification ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA268525.

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Okorafor, Agbai Azubuike. « A study of heat and mass transfer in a double-diffusive system / ». Available from the University of Aberdeen Library and Historic Collections Digital Resources. Restricted : no access until May 13, 2009, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26048.

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Miller, Mark W. « Heat transfer in a coupled impingement-effusion cooling system ». Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4807.

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The efficiency of air-breathing gas turbine engines improves as the combustion temperature increases. Therefore, modern gas turbines operate at temperatures greater than the melting temperature of hot-gas-path components, and cooling must be introduced in order to maintain mechanical integrity of those components. Two highly effective techniques used in modern designs for this purpose are impingement cooling and use of coolant film on hot-gas-path surface introduced through discrete film or effusion holes. In this study, these two mechanisms are coupled into a single prototype cooling system. The heat transfer capability of this system is experimentally determined for a variety of different geometries and coolant flow rates. This study utilizes Temperature Sensitive Paint (TSP) in order to measure temperature distribution over a surface, which allowed for local impingement Nusselt number, film cooling effectiveness, and film cooling heat transfer enhancement profiles to be obtained. In addition to providing quantitative heat transfer data, this method allowed for qualitative investigation of the flow behavior near the test surface. Impinging jet-to-target-plate spacing was varied over a large range, including several tall impingement scenarios outside the published limits. Additionally, both in-line and staggered effusion arrangements were studied, and results for normal injection were compared to full coverage film cooling with inclined- and compound-angle injection. Effects of impingement and effusion cooling were combined to determine the overall cooling effectiveness of the system. It is shown that low impingement heights produce the highest Nusselt number, and that large jet-to-jet spacing reduces coolant flow rate while maintaining moderate to high heat transfer rates. Staggered effusion configurations exhibit superior performance to in-line configurations, as jet interference is reduced and surface area coverage is improved. Coolant to mainstream flow mass flux ratios greater than unity result in jet blow-off and reduced effectiveness. The convective heat transfer coefficient on the film cooled surface is higher than a similar surface without coolant injection due to the generation of turbulence associated with jet-cross flow interaction.
ID: 030646180; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; .; Thesis (M.S.M.E.)--University of Central Florida, 2011.; Includes bibliographical references (p. 171-176).
M.S.M.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering; Thermo-Fluids Track
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Tetlow, David. « Heat transfer enhancement in integrated phase change drywall system ». Thesis, Nottingham Trent University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446610.

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Thuppal, Vedanta Srivatsan, et Naga Vamsi Krishna Kora. « HEAT TRANSIENT TRANSFER ANALYSIS OF BRAKE DISC /PAD SYSTEM ». Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13461.

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Braking is mainly controlled by the engine. Friction between a pair of pads and a rotating disc converts the kinetic energy of the vehicle into heat. High temperatures can be reached in the system which can be detrimental for both, components and passenger safety. Numerical techniques help simulate load cases and compute the temperatures field in brake disc and brake pads. The present work implements a Finite Element (FE) toolbox in Matlab/Simulink able to simulate different braking manoeuvres used for brake dimensioning mainly in the early phase of car development process. The brake pad/disc geometry is considered as an axisymmetric body assuming negligible temperature gradient along the circumference of the disc. Calibration using three control factors namely: heat coefficient during braking , acceleration  and emissivity  for the implemented thermal model is performed using experimental investigation at Volvo Car Corporation (VCC) for three specific severe load cases. The thermal model is extended to measure brake fluid temperatures to ensure no vaporisation occurs. Simulation results of the brake disc and brake pad show good correlation with the experimental tests. A sensitivity analysis with the control factors showed convective coefficient during acceleration  the most sensitive, with temperature change of around 16%.
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Rajab, Ahmed Dawod A. « Heat transfer study of an immersed horizontal tube desalination system ». Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240806.

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Anzalone, Thomas M. « Heat transfer characteristics of a fluidized bed : stirling engine system ». The Ohio State University, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291128389.

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Fiala, Dusan. « Dynamic simulation of human heat transfer and thermal comfort ». Thesis, Online version, 1998. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.340123.

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Moss, Michael Andrew. « A knowledge based database system for jet impingement heat transfer correlations ». Thesis, Nottingham Trent University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334747.

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Livres sur le sujet "Primary Heat Transfer System"

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Whitehouse, Adrian Paul. Heat transfer fluid in an industrial process refrigeration system. Birmingham : University of Birmingham, 1991.

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C, Civinskas Kestutis, United States. National Aeronautics and Space Administration. et U.S. Army Research Laboratory., dir. Two-dimensional Navier-Stokes heat transfer analysis for rough turbine blades system. [Washington, DC : National Aeronautics and Space Administration, 1991.

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Boyle, Robert J. Two-dimensional Navier-Stokes heat transfer analysis for rough turbine blades system. [Washington, DC : National Aeronautics and Space Administration, 1991.

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Boyle, Robert J. Two-dimensional Navier-Stokes heat transfer analysis for rough turbine blades system. [Washington, DC : National Aeronautics and Space Administration, 1991.

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Boyle, Robert J. Two-dimensional Navier-Stokes heat transfer analysis for rough turbine blades system. [Washington, DC : National Aeronautics and Space Administration, 1991.

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Clements, Joseph A. Heat transfer performance of a roof-spray cooling system employing the transfer function method. Springfield, Va : Available from the National Technical Information Service, 1993.

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Delil, A. A. M. Test loops for two-phase thermal management system components. Amsterdam, Netherlands : National Aerospace Laboratory, 1990.

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Heat transfer : Thermal management of electronics. Boca Raton : Taylor & Francis, 2010.

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Abdul-Aziz, Ali. Effects of cooling system parameters on heat transfer in PAFC stack. [Washington, DC : National Aeronautics and Space Administration, 1985.

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Heald, Edward E. Heat transfer : User guide for revision 5.1 : notes and exercises. Houston, PA (P.O. Box 65, Johnson Rd., Houston 15342-0065) : ANSYS, 1995.

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Chapitres de livres sur le sujet "Primary Heat Transfer System"

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Tiwari, Gopal Nath, et Neha Gupta. « Basic Heat Transfer ». Dans Photovoltaic Thermal Passive House System, 41–83. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9780429445903-2.

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Majchrzak, E. « Utilization of the Boundary Element Method for Numerical Analysis of Thermal Processes in the Casting-Mould System ». Dans Heat Transfer, sous la direction de L. C. Wrobel et C. A. Brebbia, 223–38. Berlin, Boston : De Gruyter, 1991. http://dx.doi.org/10.1515/9783110853209-016.

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Bauer, Thomas. « Heat Transfer Theory and System Modelling ». Dans Thermophotovoltaics, 85–99. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19965-3_5.

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Scherer, P. W., et L. M. Hanna. « Heat and Water Transport in the Human Respiratory System ». Dans Heat Transfer in Medicine and Biology, 287–306. Boston, MA : Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-8285-0_8.

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Karcz, J., et F. Strek. « Heat Transfer in Mechanically Stirred Gas — Liquid System ». Dans Fluid Mechanics and Its Applications, 163–71. Dordrecht : Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-015-7973-5_19.

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Sharp, M. Keith. « Models of the Cardiovascular System ». Dans Theory and Applications of Heat Transfer in Humans, 71–118. Chichester, UK : John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119127420.ch6.

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Raghunatha Reddy, D. V., P. Bhramara et K. Govindarajulu. « Performance Analysis of Domestic Refrigerator Using Hydrocarbon Refrigerant Mixtures with ANN and Fuzzy Logic System ». Dans Numerical Heat Transfer and Fluid Flow, 113–21. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1903-7_14.

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Meng, Yuan, Gao Qing, Zhang Tianshi et Wang Guohua. « Experimental Study on Direct Expansion Cooling Battery Thermal Management System ». Dans Advances in Heat Transfer and Thermal Engineering, 573–75. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_99.

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Ihekwaba, Chidiebere, et Mansour Al Qubeissi. « A Parametric Study into a Passively Enhanced Heat Separation System ». Dans Advances in Heat Transfer and Thermal Engineering, 265–69. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4765-6_46.

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Visaria, Rachana. « Lumped Parameter Modeling of Human Respiratory System ». Dans Theory and Applications of Heat Transfer in Humans, 119–31. Chichester, UK : John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119127420.ch7.

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Actes de conférences sur le sujet "Primary Heat Transfer System"

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Shokouhmand, H., M. Moghaddami et H. Jafari. « Heat Transfer Enhancement in Triangular Fin ». Dans ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56478.

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Fins are widely utilized in many industrial applications for example, fins are used in air cooled finned tube heat exchangers like car radiators, heat rejection devices, refrigeration systems and in condensing central heat exchangers. In this paper, heat transfer inside the fin system composed of a primary rectangular fin with a number of rectangular fins (secondary fins), which are attached on its surface, is modeled and analyzed numerically. The length of the secondary fins decreases linearly from the base of the primary fin to its tip. This modified triangular fin is a kind of improved tree fin networks. The effectiveness of the modified triangular fin is compared with the effectiveness of triangular fin which is calculated analytically. The results show that adding secondary fins increases the effectiveness of triangular fin significantly. Also, it is found that increasing the number of secondary fins in a constant length of primary fin will increase the effectiveness. In addition, by comparing the results it can be concluded that by shortening the length of the primary fin in modified triangular fin, the effectiveness will increase significantly to the contrary of the triangular fin, so smaller heat exchangers can be built by using the modified triangular fin. It is found that in a constant length of primary fin, there is an optimum thickness of secondary fins which maximize the effectiveness of the fin.
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Elgowainy, Amgad, Samuel Shelton et James Hogan. « Performance Comparison of Heat-Driven and Electric-Driven Ammonia Heat Pump Systems ». Dans ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56654.

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The objective of this study is to evaluate the solid sorption technology for residential cooling applications. The solid sorption technology uses natural gas as the primary energy source for compressing and circulating the refrigerant in the air-conditioning system. The system delivered 6.7 kW of cooling at 35°C outdoor temperature. The cooling gas COP was 0.32 at 27.8°C outdoor temperature. An ammonia vapor compression system was established and tested by operating a steady state mechanical compressor in place of the cyclic thermal compressor to evaluate and verify the cyclic performance of the sorption system. The system’s thermal compressor efficiency was almost one-third that of the mechanical compressor based on the input power of the primary energy source for each compressor. The testing revealed that the cooling capacity at the air handler is about 1.75 kW less than that at the ammonia/glycol evaporator chiller due to parasitic power gains.
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Hamilton, Anthony, Steve J. Burany, Samuel B. Peralta et Lindsay Greenland. « Robotic removal of high-activity debris from a nuclear primary heat transfer system ». Dans 2010 1st International Conference on Applied Robotics for the Power Industry (CARPI 2010). IEEE, 2010. http://dx.doi.org/10.1109/carpi.2010.5624480.

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Revankar, Shripad T., et Wenzhong Zhou. « Vertical Tube Passive Condenser Under Secondary Pool Water Level Transient ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23125.

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An experimental work was carried out on a passive containment cooling system (PCCS) test facility where the effect of PCCS pool water level change on the PCCS heat transfer characteristics was investigated. The specific design of condensing tube was based on scaling analysis from the PCCS design of Economic Simplified Boiling Water Reactor (ESBWR). The annulus between the primary condensing tube and the secondary boiling tube is filled with water and serves as water pool. During the test, steam generated in the pool is discharged through three steam exit nozzles located symmetrically at the top of the secondary boiling tube. Transient tests carried out with secondary pool water level change show that the system pressure for complete condensation mode increases with decrease in water level, however rate of condensation is almost constant. However, if the PCCS is operated in through flow mode the system pressure (primary side pressure) is constant, however, the condensate rate decreases indicating that some of the steam does not condense.
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Kargar, Alireza, Mohammad H. Hosni, Steve Eckels et Tomas Gielda. « Experimental Analysis of an Air-to-Air Heat Exchanger for Use in a Refrigeration Brayton Cycle ». Dans ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56544.

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The refrigeration Brayton cycle, which has been used extensively in various industries, has an excellent potential for use in automotive air conditioning applications. However, the air-cycle system has a couple of drawbacks including fog generation and low cycle efficiency. In this research project, an air-to-air heat exchanger called a ‘mixer’ is designed and used at the outlet of a refrigeration Brayton cycle. The primary function of the mixer is to remove moisture from the secondary warm airflow into the system. Successful moisture removal from the secondary airflow results in achieving the second function of fog dissipation from the primary cold airflow. In order for the system to perform appropriately, the moisture removal rate must be kept at the highest possible rate. The experimental results from this research project reveal that to enhance moisture removal rate, one may either increase the primary cold airflow rate, decrease the secondary warm airflow rate, or the combination of the above airflow adjustments. Furthermore, based on experimental results, one may speculate that there is an optimum point in decreasing the secondary airflow rate. However, in increasing the primary airflow rate, one must be aware of the pressure drop through the cold side of the mixer as the higher pressure drop results in higher power consumption for the Brayton cycle. It is important to point out that appropriate levels of the primary and secondary airflows impacts the mixer effectiveness, and that for a constant cold airflow rate, decreasing the warm airflow rate below the cold airflow rate results in higher effectiveness.
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Zhang, Wenwen, Wenxi Tian, Suizheng Qiu et Guanghui Su. « Numerical Investigation on Heat Removal Capacity of Passive Residual Heat Removal Heat Exchanger ». Dans 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30302.

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In the present study, thermal-hydraulics characteristics of AP1000 passive residual heat removal heat exchanger (PRHR-HX) at initial operating stage were analyzed based on the porous media models. The data predicated by RELAP5 under the condition of the station blackout was employed as the inlet flow rate and temperature boundary of CFD calculation. The heat transfer from the primary side coolant to the in-containment refueling water storage tank (IRWST) side fluid was calculated in a three-dimensional geometry during iterations, and the distributed resistances were added into the C-type tube bundle regions. Three-dimensional distributions of velocity and temperature in the IRWST were calculated by the CFD code ANSYS FLUENT. The primary temperature, heat transfer coefficients of two sides and the heat transfer were obtained using the coupled heat transfer between the primary side and the IRWST side. The simulation results indicated that the water temperature rises gradually which leads to a thermal stratification phenomenon in the tank and the heat transfer capability decreases with an increase of water temperature. The present results indicated that the method containing coupled heat transfer from the primary side fluid to IRWST side fluid and porous media model is a suitable approach to study the transient thermal-hydraulics of PRHR/IRWST system.
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Kukulka, David J., Wei Li et Rick Smith. « Comparison of Heat Transfer Performance Between Smooth and Enhanced Heat Transfer Tubes ». Dans ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/mnhmt2019-4044.

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Abstract Heat transfer enhancement is an important factor in obtaining energy efficiency improvements in all heat transfer applications. A numeric study was performed that compares the performance of heat exchangers using the Vipertex enhanced heat transfer tubes (model 1EHT) to the performance of heat exchangers that use smooth surface tubes and other enhanced tubes. Surface enhancement of the 1EHT tube is accomplished through the use of the primary dimple enhancement and a secondary background pattern made up of petal arrays. Utilization of enhanced heat transfer tubes is an effective method that is utilized in the development of high performance thermal systems. Vipertex™ tubes, have been designed and produced through material surface modifications that produce flow optimized heat transfer tubes that increase heat transfer performance. Current energy demands and the desire to increase efficiencies of systems have prompted the development of optimized enhanced heat transfer surfaces. Enhanced heat transfer tubes are widely used in many areas (refrigeration, air-conditioning, process, petrochemical, chemical, etc.) in order to reduce cost, create a smaller application footprint or increase production. A new type of enhanced heat transfer tube has been created; therefore it is important to investigate relevant heat exchanger designs using the Vipertex enhanced surface tube in industrial applications and compare that performance to smooth tubes and other enhanced tubes. Results include design characteristics and performance predictions using the design simulations produced using HTRI Exchanger Suite (2016). Performance for all cases considered using the Vipertex tube predicted over design when compared to a smooth tube design. Vipertex 1EHT tubes produced enhanced heat transfer and cost efficient designs. In some of the case studies the 1EHT tubes produce an overdesign that is more than 35%, while smooth tubes produce an underdesign and other low fin tubes produce overdesign but not as large as the 1EHT tubes.
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Sonsalla, Tyler J., Leland Weiss, Arden Moore, Adarsh Radadia, Debbie Wood et Davis Bailey. « Zinc Composites With Enhanced Thermal Conductivity for Use in Fused Deposition Modeling Systems ». Dans ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-5062.

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Waste heat is a major energy loss in manufacturing facilities. Thermally conductive polymer composite heat exchangers could be utilized in the ultralow temperature range (below 200° C) for waste heat recovery. Fused deposition modeling (FDM), also known as three-dimensional (3-D) printing, has become an increasingly popular technology and presents one approach to fabrication of these exchangers. The primary challenge to the use of FDM is the low-conductivity of the materials themselves. This paper presents a study of a new polymer-Zn composite designed for enhanced thermal conductivity for usage in FDM systems. Thermal properties were assessed in addition to basic printability. Filler volume percentages were varied to study the effects on material properties. Scanning electron microscope (SEM) images were taken of the 3-D printed test pieces to determine filler orientation and filler distribution. Lastly, experimentally obtained thermal conductivity values were compared to the theoretical thermal conductivity values predicted from the Lewis-Nielsen model.
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Park, Hyun-Sik, Ki-Yong Choi, Seok Cho et Sung-Jae Yi. « Experimental and Analytical Study on the Heat Transfer Characteristics in a Natural Circulation Loop for an Integral Type Reactor ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22848.

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The heat transfer characteristics in a natural circulation loop for an integral type reactor were experimentally investigated by using the VISTA facility and steady-state natural circulation flow rates were acquired for various core powers and feed water flow rates. The experimental data were compared with the predictions from existing correlations of Duffey et al. (1987) and Vijayan et al. (2002). It was shown that Duffey et al. (1987)’s correlation for a two-phase natural flow predicted the experimental data well. Also the experimental data on the natural circulation in the primary loop of the VISTA facility were analyzed by using a best-estimate system analysis code, MARS. The MARS code predicted the overall natural circulation flow characteristics reasonably.
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Sher, Ilai. « Effect of Non-Isothermal Conditions on Liquid Breakup Mechanisms ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23372.

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Liquid breakup mechanism utilization is prevalent in numerous applications. One of the most common uses of this phenomenon is in fuel injection systems. Liquid fuel is injected into an ambient air, to prepare a combustible mixture. Generally, evenly spread tiny fuel droplets are desirable. This is usually achieved through multiple liquid breaking mechanisms: Primary breakup of liquid jet, Secondary breakup of travelling liquid droplets, and Secondary breakup of wall-impinging liquid droplets. Indeed, many studies are devoted to the modelling of those phenomena. However, the absolute majority of those studies are limitedly focused on the isothermal case, where liquid is assumed to be of ambient gas’ temperature. Conversely, practical conditions, under which rather cold fuel is normally injected into hot ambient air, suggest the real case to be non-isothermal. Moreover, the non-isothermal nature of that process seems to have its effect at the most relevant to breakup regions, i.e. the breaking interfacial surfaces. It is shown that as these surfaces can be in instant contact with a hot ambient, breakup can be greatly altered by the extent of this sudden thermal exposure, through its mostly transient and even spatial effect on physical properties of breaking interfaces. This is shown to be of significant effect on all breakup mechanisms: primary and secondary. New models are suggested for these non-isothermal phenomena, which combine transient heat-transfer with inter-phase hydrodynamic breakup, through physical properties’ dependency on temperature. Results are discussed in terms of effect on spray breakup products, and a careful comparison with the trend of a limited number of so-far available experimental results is presented.
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Rapports d'organisations sur le sujet "Primary Heat Transfer System"

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Popov, Emilian L., Graydon L. Yoder Jr et Seokho H. Kim. RELAP5 MODEL OF THE DIVERTOR PRIMARY HEAT TRANSFER SYSTEM. Office of Scientific and Technical Information (OSTI), août 2010. http://dx.doi.org/10.2172/1000902.

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Carbajo, Juan J., Graydon L. Yoder Jr et Seokho H. Kim. RELAP5 Model of the Vacuum Vessel Primary Heat Transfer System. Office of Scientific and Technical Information (OSTI), juillet 2010. http://dx.doi.org/10.2172/983832.

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Popov, Emilian L., Graydon L. Yoder Jr et Seokho H. Kim. RELAP5 Model of the First Wall/Blanket Primary Heat Transfer System. Office of Scientific and Technical Information (OSTI), juin 2010. http://dx.doi.org/10.2172/985287.

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Yoder Jr, Graydon L., Karen Harvey et Juan J. Ferrada. Thermal Analysis of the Divertor Primary Heat Transfer System Piping During the Gas Baking Process. Office of Scientific and Technical Information (OSTI), février 2011. http://dx.doi.org/10.2172/1004961.

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Yoder Jr, Graydon L., Juan J. Carbajo et Seokho H. Kim. Comparison of Alternatives to the 2004 Vacuum Vessel Heat Transfer System. Office of Scientific and Technical Information (OSTI), décembre 2010. http://dx.doi.org/10.2172/1000415.

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Prucha, R. H. Heat and mass transfer in the Klamath Falls, Oregon, geothermal system. Office of Scientific and Technical Information (OSTI), mai 1987. http://dx.doi.org/10.2172/6247658.

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Eastman, Alan D. Low-Temperature Enhanced Geothermal System using Carbon Dioxide as the Heat-Transfer Fluid. Office of Scientific and Technical Information (OSTI), juillet 2014. http://dx.doi.org/10.2172/1164240.

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Uchida, Keisuke, Takashi Suzuki, Yasufumi Oguri et Masatake Yoshida. Precise Measurement of Heat Transfer in the Engine Intake System Using Intake Port Model. Warrendale, PA : SAE International, septembre 2005. http://dx.doi.org/10.4271/2005-08-0548.

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Cliff B. Davis. Analysis Methods and Desired Outcomes of System Interface Heat Transfer Fluid Requirements and Characteristics Analyses. Office of Scientific and Technical Information (OSTI), avril 2005. http://dx.doi.org/10.2172/910992.

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Chyu, M. K. Use of a laser-induced fluorescence thermal imaging system for film cooling heat transfer measurement. Office of Scientific and Technical Information (OSTI), avril 1996. http://dx.doi.org/10.2172/226040.

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