Academic literature on the topic 'Thermosyphon mode'
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Journal articles on the topic "Thermosyphon mode"
Balunov, Boris, and Mikle Egorov. "High-temperature service life tests of full-size thermosyphons." E3S Web of Conferences 140 (2019): 05009. http://dx.doi.org/10.1051/e3sconf/201914005009.
Full textShishido, Ikuro, Yukio Suzuki, Kazufumi Watanabe, and Mutsumi Suzuki. "Development of dual-mode cascaded thermosyphon." KAGAKU KOGAKU RONBUNSHU 15, no. 4 (1989): 868–71. http://dx.doi.org/10.1252/kakoronbunshu.15.868.
Full textRodríguez-Bernal, Aníbal, and Erik S. Van Vleck. "Complex Oscillations in a Closed Thermosyphon." International Journal of Bifurcation and Chaos 08, no. 01 (January 1998): 41–56. http://dx.doi.org/10.1142/s0218127498000048.
Full textTiwari, G. N., S. N. Shukla, and M. S. Sodha. "Performance of large solar water heating system: Thermosyphon mode." Energy Conversion and Management 25, no. 1 (January 1985): 29–38. http://dx.doi.org/10.1016/0196-8904(85)90066-4.
Full textSingh, A. K., and G. N. Tiwari. "Thermal evaluation of regenerative active solar distillation under thermosyphon mode." Energy Conversion and Management 34, no. 8 (August 1993): 697–706. http://dx.doi.org/10.1016/0196-8904(93)90105-j.
Full textZhang, Hainan, Shuangquan Shao, and Changqing Tian. "Simulation of the Thermosyphon Free Cooling Mode in an Integrated System of Mechanical Refrigeration and Thermosyphon for Data Centers." Energy Procedia 75 (August 2015): 1458–63. http://dx.doi.org/10.1016/j.egypro.2015.07.260.
Full textZhang, Hainan, Shuangquan Shao, Hongbo Xu, Huiming Zou, Mingsheng Tang, and Changqing Tian. "Simulation on the performance and free cooling potential of the thermosyphon mode in an integrated system of mechanical refrigeration and thermosyphon." Applied Energy 185 (January 2017): 1604–12. http://dx.doi.org/10.1016/j.apenergy.2016.01.053.
Full textKamburova, Veselka, Ahmed Ahmedov, Iliya Iliev, Ivan Beloev, and Ivan Pavlovic. "Numerical modelling of the operation of a two-phase thermosyphon." Thermal Science 22, Suppl. 5 (2018): 1311–21. http://dx.doi.org/10.2298/tsci18s5311k.
Full textIPPOHSHI, Shigetoshi, Hideaki IMURA, Akio MUTOH, and Kazuki MOTOMATSU. "K-1613 Study on Heat Transport of a Top-heat-mode Loop Thermosyphon." Proceedings of the JSME annual meeting V.01.1 (2001): 217–18. http://dx.doi.org/10.1299/jsmemecjo.v.01.1.0_217.
Full textZhao, Shu Lei, Xiao Tian Ding, Zheng Yuan Wei, and Gui Fang Liu. "Performance Test and Flow Pattern Simulation of Small Diameter Thermosyphons." Advanced Materials Research 634-638 (January 2013): 3782–87. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3782.
Full textDissertations / Theses on the topic "Thermosyphon mode"
Козак, Дмитро Віталійович. "Теплотехнічні характеристики комбінованого сонячного колектора на основі алюмінієвих канавчатих теплових труб." Thesis, КПІ ім. Ігоря Сікорського, 2018. https://ela.kpi.ua/handle/123456789/25902.
Full textThesis for the Candidate degree in Technical Science on the specialty 05.14.06 «Technical thermophysics and industrial thermal power engineering». – National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ministry of Education and Science of Ukraine, Kyiv, 2018. The work is devoted to increasing energy efficiency and simplification of integration of solar systems on the basis of the photovoltaic thermal (PV/T) collector in the facades and roofs of buildings due to use as an element of the absorbing surface of aluminum grooved heat pipes (AGHP). It is established that the efficiency of the operation of the PV/T collector with AGHP in the thermosyphon mode is significantly influenced by the thermal characteristics of the HP, which in turn depends on the following parameters: the diameter of the steam space, the thermophysical properties of the working fluid, the lengths of the heating and condensation zones, and the total length of the AGHP. Increasing the thermal conductivity of AGHP can be achieved by providing a guaranteed amount of coolant to the heating zone and selecting the optimal design parameters of the HP at the appropriate operating modes. A new approach to the implementation of PVT collectors on the basis of AGHPs is proposed. In this case, AGHPs perform a complex role – at the same time it is a highly efficient thermal conductor and a system of cooling solar cells. The design of an aluminum heat pipe with a grooved capillary structure for PVT collectors has been developed. An n-pentane is chosen as the optimum coolant for a two-phase system. The developed samples of heat pipes can provide the operation of the PVT collector in the thermal mode from 0 oC to 120 oC. In this case, the temperature range of its operation is from −40 °C to +230 °C. The analysis of calculations and experimental data showed that the PV/T collector with AGHP allows to increase the efficiency of obtaining electric energy up to 18 % due to the cooling of the PV, while the maximum electric power PV/T collector was 135 W/m2. In addition to electricity, simultaneously, it is possible to get up to 457 W of heat from 1 m2 of heat-absorbing surface, at a temperature of the output coolant 25 oС and a density of solar flux of 900 W/m2. On the basis of theoretical analysis, the most optimal modes of operation of the PV/T collector were identified – the most optimal one is the mode of PV/T collector functioning at values of 30–50 oC of the temperature difference between the absorbent surface and the environment. The new PV/T collector design has a more efficient performance compared to separate thermal solar collectors and photoelectric batteries at low temperatures on an absorbent surface (below 50 oC), and usually at higher solar flux values (over 600 W/m2). The first developed programs and methods of research of PVT collectors in artificial and natural light developed an engineering methodology for calculating the thermal characteristics of PVT collector with AGHPs during their operation in a thermosyphon mode. The recommendations for the production of PVT collectors and their use in solar power systems are given. The results of the work in the future can be used at the enterprises of LLC «Effectprof» (Kyiv), PC Sumy SPO M.V. Frunze (Sumy), PE Scientific-Implementation Firm "Thermal Technologies" (Kiev), which are engaged in the development, manufacture and implementation of heat-exchange equipment and energy-efficient systems. For further implementation, it is necessary to carry out works on designing and manufacturing an industrial design of PVT collector or facade PVT collector and to conduct tests in the field.
Диссертация на соискание ученой степени кандидата технических наук по специальности 05.14.06 «Техническая теплофизика и промышленная теплоэнергетика». – Национальный технический университет Украины «Киевский политехнический институт имени Игоря Сикорского», Министерство образования и науки Украины, Киев, 2018. Работа посвящена повышению энергетической эффективности и упрощению интеграции солнечных систем на основе комбинированных солнечных коллекторов в фасады и крыши зданий за счет использования в качестве элемента теплопоглощающей поверхности алюминиевых канавчатых тепловых труб. Установлено, что на эффективность работы комбинированного солнечного коллектора с алюминиевыми канавчатыми тепловыми трубами в режиме термосифона существенно влияют теплотехнические характеристики тепловых труб, в свою очередь зависят от следующих параметров: диаметр парового пространства, теплофизические свойства рабочей жидкости, длины зон нагрева и конденсации, а также общая длина алюминиевых канавчатых тепловых труб. Повышение теплопередающих способности алюминиевых канавчатых тепловых труб можно достичь благодаря обеспечению подачи гарантированного количества теплоносителя в зону нагрева и выбора оптимальных конструктивных параметров тепловых труб при соответствующих режимах работы. Анализ расчетов и экспериментальных данных показал, что комбинированный солнечный коллектор с алюминиевыми канавчатыми тепловыми трубами позволяет повысить эффективность получения электрической энергии до 18% за счет охлаждения фотоэлектрических преобразователей, при этом максимальная электрическая мощность комбинированного солнечного коллектора составляла 135 Вт/м2. Кроме электроэнергии, одновременно можно получить до 457 Вт тепла с 1 м2 теплопоглощающей поверхности при температуре исходного теплоносителя 25 °С и плотности солнечного потока 900 Вт/м2. На основе теоретического анализа выявлены наиболее оптимальные режимы эксплуатации комбинированного солнечного коллектора – режим функционирования при значениях 30–50 °С температурного перепада между теплопоглощающей поверхностью и окружающей средой. Новая конструкция комбинированного солнечного коллектора имеет более эффективную работу по сравнению с раздельными тепловыми солнечными коллекторами и фотоэлектрическими батареями при низких температурах на теплопоглощающей поверхности (ниже 50 °С) и обычно при более высоких значениях солнечного потока (более 600 Вт/м2).
Bodjona, Hèzièwè Serge. "Elaboration d'un modèle détaillé d'une boucle diphasique gravitaire et développement d'un modèle réduit associé." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2017. http://www.theses.fr/2017ESMA0005/document.
Full textToday, electrical systems are becoming increasingly important in the air, rail and automotive sectors.The immediate consequence of this progress is the miniaturization of systems (converters) requiring very important cooling means. Whereas conventional cooling solutions are reaching their limit, an alternative one can be sought in two-phase loops based on the liquid-vapor phase change of a working fluid, in particular two-phase loop thermosyphon. The objective of this thesis is twofold : to propose a detailed model of a two phase loop thermosyphon as well as a reduced model able to calculate the variables at any location of the loop at any time with a much smaller computing time. First, the equation of the transient one-dimensional compressible one-phase and two-phase fluid flow is solved using the explicit Euler method of order 1 and the finite volume method. The liquid-vapor mixture is modeled as a homogeneous mixture at mechanical and thermal equilibrium. The closure laws of the model are deduced from the "Stiffened Gas" state laws. For the reduced model, an extension of the modal identification method is proposed. The structure of the reduced model is first determined carrying out the Galerkin projection of the continuous conservation equations.Then the parameters of the model are identified by the resolution of an optimization problem. The reduced model thus constructed is then validated on several cases with different dynamics
Sittmann, Ilse. "Inside-pipe heat transfer coefficient characterisation of a one third height scale model of a natural circulation loop suitable for a reactor cavity cooling system of the Pebble Bed Modular Reactor." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6708.
Full textENGLISH ABSTRACT: The feasibility of a closed loop thermosyphon for the Reactor Cavity Cooling System of the Pebble Bed Modular Reactor has been the subject of many research projects. Difficulties identified by previous studies include the hypothetical inaccuracies of heat transfer coefficient correlations available in literature. The aim of the research presented here is to develop inside-pipe heat transfer correlations that are specific to the current design of the RCCS. In order to achieve this, a literature review is performed which identifies reactors which employ closed loop thermosyphons and natural circulation. The literature review also explains the general one-dimensional two-fluid conservation equations that form the basis for numerical modelling of natural circulation loops. The literature review lastly discusses available heat transfer coefficient correlations with the aim of identifying over which ranges and under which circumstances these correlations are considered accurate. The review includes correlations commonly used in natural circulation modelling in the nuclear industry in aims of identifying correlations applicable to the modelling of the proposed RCCS. One of the objectives of this project is to design and build a one-third-height-scale model of the RCCS. Shortcomings of previous experimental models were assessed and, as far as possible, compensated for in the design of the model. Copper piping is used, eliminating material and surface property uncertainties. Several sight glasses are incorporated in the model, allowing for the visual identification of two-phase flow regimes. An orifice plate is used allowing for bidirectional flow measurement. The orifice plate, thermocouples and pipe-in-pipe heat exchangers are calibrated in-situ to minimize experimental error and aid repeatability. Twelve experiments are performed with data logging occurring every ten seconds. The results presented here are limited to selected single and two-phase flow operating mode results. Error analyses and repeatability of experimental measurements for single and two-phase operating modes as well as cooling water mass flow rates are performed, to show repeatability of experimental results. These results are used to mathematically determine the experimental inside-pipe heat transfer coefficients for both the evaporator and condenser sections. Trends in the heat transfer coefficient profiles are identified and the general behaviour of the profiles is thoroughly explained. The RCCS is modelled as a one-dimensional system. Correlations for the friction factor, heat transfer coefficient, void fraction and two-phase frictional multiplier are identified. The theoretical heat transfer coefficients are calculated using the mathematical model and correlations identified in the literature review. Fluid parameters are evaluated using experimentally determined temperatures and mass flow rates. The resulting heat transfer coefficient profiles are compared to experimentally determined profiles, to confirm the hypothesis that existing correlations do not accurately predict the inside-pipe heat transfer coefficients. The experimentally determined coefficients are correlated to 99% confidence intervals. These generated correlations, along with identified and established twophase heat transfer coefficient correlations, are used in a mathematical model to generate theoretical coefficient profiles. These are compared to the experimentally determined coefficients to show prediction accuracy.
AFRIKAANSE OPSOMMING: Die haalbaarheid van ‘n natuurlike sirkulasie geslote lus vir die Reaktor Holte Verkoeling Stelsel (RHVS) van die Korrelbed Modulêre Kern-Reaktor (KMKR) is die onderwerp van talle navorsings projekte. Probleme geïdentifiseer in vorige studies sluit in die hipotetiese onakkuraatheid van hitte-oordrag koëffisiënt korrelasies beskikbaar in literatuur. Die doel van die navorsing aangebied is om binne-pyp hitte-oordrag koëffisiënt korrelasies te ontwikkel spesifiek vir die huidige ontwerp van die RHVS. Ten einde dit te bereik, word ‘n literatuurstudie uitgevoer wat kern-reaktors identifiseer wat gebruik maak van natuurlike sirkulasie lusse. Die literatuurstudie verduidelik ook die algemene een-dimensionele twee-vloeistof behoud vergelykings wat die basis vorm vir numeriese modellering van natuurlike sirkulasie lusse. Die literatuurstudie bespreek laastens beskikbare hitte-oordrag koëffisiënt korrelasies met die doel om te identifiseer vir welke massavloei tempo waardes en onder watter omstandighede hierdie korrelasies as korrek beskou is. Die ontleding sluit korrelasies in wat algemeen gebruik word in die modellering van natuurlike sirkulasie in die kern industrie met die hoop om korrelasies vir gebruik in die modellering van die voorgestelde RHVS te identifiseer. Een van die doelwitte van die projek is om ‘n een-derde-hoogte-skaal model van die RHVS te ontwerp en te bou. Tekortkominge van vorige eksperimentele modelle is geidentifiseer en, so ver as moonlik, voor vergoed in die ontwerp van die model. Koper pype word gebruik wat die onsekerhede van materiaal en opperkvlak eindomme voorkom. Verkseie deursigtige polikarbonaat segmente is ingesluit wat visuele identifikasie van twee-fase vloei regimes toelaat. ‘n Opening plaat word gebruik om voorwaartse en terugwaartse vloeimeting toe te laat. Die opening plaat, termokoppels en hitte uitruilers is gekalibreer in plek om eksperimentele foute te verminder en om herhaalbaarheid te verseker. Twaalf eksperimente word uitgevoer en data word elke tien sekondes aangeteken. Die resultate wat hier aangebied word, is beperk tot geselekteerde enkel- en tweefase vloei meganismes van werking. Fout ontleding en herhaalbaarheid van eksperimentele metings, om die herhaalbaarheid van eksperimentele resultate te toon. Hierdie is gebruik om wiskundig te bepaal wat die eksperimentele binne-pyp hitte-oordrag koëffisiënte is vir beide die verdamper en kondenseerder afdelings. Tendense in die hitte-oordrag koëffisiënt profiele word geïdentifiseer en die algemene gedrag van die profiles is deeglik verduidelik. Die RHVS is gemodelleer as 'n een-dimensionele stelsel. Korrelasies vir die wrywing faktor, hitte-oordrag koëffisiënte, leegte-breuk en twee-fase wrywings vermenigvuldiger word geïdentifiseer. Die teoretiese hitte-oordrag koëffisiënte word bereken deur middle van die wiskundige model en korrelasies wat in literatuur geidentifiseer is. Vloeistof parameters is geëvalueer met eksperimenteel bepaalde temperature en massa-vloei tempos. Die gevolglike hitte-oordrag koëffisiënt profiles is vergelyk met eksperimentele profiele om die hipotese dat die bestaande korrelasies nie die binne-pyp hitte-oordrag koëffisiënte akkuraat voorspel nie, te bevestig. Die eksperimenteel bepaalde koëffisiënte is gekorreleer en die gegenereerde korrelasies, saam met geïdentifiseerde twee-fase hitte-oordrag koëffisiënt korrelasies, word gebruik in 'n wiskundige model om teoretiese koëffisiënt profiele te genereer. Dit word dan vergelyk met die eksperimenteel bepaalde hitteoordrag koëffisiënte om die akkuraatheid van voorspelling te toon. Tekortkominge in die teoretiese en eksperimentele model word geïdentifiseer en aanbevelings gemaak om hulle aan te spreek in die toekoms.
Book chapters on the topic "Thermosyphon mode"
Jiménez-Casas, Ángela. "Asymptotic Behaviour of Finite Length Solutions in a Thermosyphon Viscoelastic Model." In Recent Advances in Differential Equations and Applications, 87–105. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00341-8_6.
Full textLi, Guoyu, Hongyuan Jing, Nikolay Volkov, Wei Ma, and Fei Wang. "Centrifuge Model Test on Performance of Thermosyphon Cooled Sandbags Supporting Warm Oil Pipeline Buried in Thawing Permafrost." In Springer Series in Geomechanics and Geoengineering, 1380–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97115-5_105.
Full textEdge, Penelope J., Peter J. Heggs, Mohamed Pourkashanian, and Alan Williams. "A CFD-process model of steam generation in a power plant by a thermosyphon system." In Computer Aided Chemical Engineering, 1869–73. Elsevier, 2011. http://dx.doi.org/10.1016/b978-0-444-54298-4.50152-5.
Full textConference papers on the topic "Thermosyphon mode"
Heggs, Peter John, and Abdelmadjid Alane. "Vacuum Operation of a Thermosyphon Reboiler." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22373.
Full textSabharwall, Piyush, Mike Patterson, and Fred Gunnerson. "Theoretical Design of Thermosyphon for Process Heat Transfer From NGNP to Hydrogen Plant." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58199.
Full textElkholy, Ahmed, and Roger Kempers. "A Compact Integrated Thermosyphon Heat Sink for Power Electronics Cooling." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11777.
Full textMarcinichen, Jackson B., John R. Thome, Raffaele L. Amalfi, and Filippo Cataldo. "Experimental Validation and Design Simulations of a Passive Two-Phase Cooling System for Datacenters." In ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipack2020-2541.
Full textArias, Hugo, Javier Cabrera, and Johann Hernandez. "Performance evaluation of a mono-crystalline PV module cooled by a flat plate solar collector in thermosyphon mode." In 2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC). IEEE, 2015. http://dx.doi.org/10.1109/pvsc.2015.7355825.
Full textAmalfi, Raffaele L., Cong H. Hoang, Ryan Enright, Filippo Cataldo, Jackson B. Marcinichen, and John R. Thome. "Operational Map and Thermal Performance of a Thermosyphon Cooling System for Compact Servers." In ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-72612.
Full textLokhmanets, Iurii, and B. Rabi Baliga. "Experimental Investigation of a Simplified Model of a Transformer Cooling System." In ASME 2017 Power Conference Joint With ICOPE-17 collocated with the ASME 2017 11th International Conference on Energy Sustainability, the ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/power-icope2017-3406.
Full textShabgard, Hamidreza, Ben Xu, and Ramkumar Parthasarathy. "Solar Thermal-Driven Multiple-Effect Thermosyphon Distillation System for Waste Water Treatment." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72492.
Full textAbdalla, Basel, Chengye Fan, Colin McKinnon, and Vincent Gaffard. "Numerical Study of Thermosyphon Protection for Frost Heave." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42326.
Full textZhang, Jinsong, Jason Hugenroth, Issam Mudawar, and Timothy S. Fisher. "Parametric Study of a Thermosyphon Loop Pressure Drop Model." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60251.
Full textReports on the topic "Thermosyphon mode"
Wagner, Anna, Jon Maakestad, Edward Yarmak, and Thomas Douglas. Artificial ground freezing using solar-powered thermosyphons. Engineer Research and Development Center (U.S.), November 2021. http://dx.doi.org/10.21079/11681/42421.
Full textSwift, T. N. Improving thermosyphon solar domestic hot water system model performance. Final report, March 1994--February 1995. Office of Scientific and Technical Information (OSTI), September 1996. http://dx.doi.org/10.2172/345031.
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