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Dissertations / Theses on the topic 'Natural heat sources'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Gubaidullin, Askar. "Natural Convection Heat Transfer in Two-Fluid Stratified Pools with Internal Heat Sources." Doctoral thesis, KTH, Energy Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3285.

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2

Akdeniz, Erhan Murat. "Effects of power pulsations on natural convection from discrete heat sources." Thesis, Monterey, California: U.S. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/34998.

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Approved for public release, distribution unlimited<br>The natural convection heat transfer from an array of heaters flush mounted on a vertical test surface in response to both step and periodic input power has been investigated. Baseline surface temperature measurements in water were obtained for several steady power inputs, ranging from 0.2 W to 1.0 W for the vertical test surface. Also, the effects of the presence of a parallel shroud near the test surface on measured temperature values were studied. The effects of periodic variations in input power on the heater element temperatures w

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3

Larsen, Stephen. "Effects of power pulsations on natural convection from discrete heat sources." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/43765.

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The natural convection heat transfer from an array of heaters flush mounted on a vertical test surface in response to both step and periodic input power has been investigated. Baseline surface temperature measurements in water were obtained for several steady power inputs, ranging from 0.2 W to 1.0 W for the vertical test surface. Also, the effects of the presence of a parallel shroud near the test surface on measured temperature values were studied. The effects of periodic variations in input power on the heater element temperatures, were then examined at selected locations. The resulting tra

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4

Willson, Thomas D. "A study of natural convection cooling of multiple discrete heat sources in a vertical channel." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23126.

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This thesis is a study of missile and target parameters used in second and third order modeling of the tracking subsystem used in radar guided guided missiles. Guidance methods are analyzed to determine which method is optimum in a search for an ideal missile. Target parameters which have an effect on the missile tracking system are analyzed and a target acceleration probability model is discussed. A two dimensional third order tracking model is simulated utilizing a Kalman filter for target parameter estimation and prediction. Linear second and third order tracking models are simulated and co

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5

Vitali, Raffaella. "Natural convection in a square cavity with discrete heat sources: an experimental and numerical analysis." Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/242977.

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Lo studio della convezione naturale in cavità quadrata con sorgenti discrete è svolto sia sperimentalmente che numericamente. Sperimentalmente attraverso l'interferometria olografica e il Particle Image Velocimetry mentre numericamente attraverso l'utilizzo del software CFD ANSYS Fluent. Sono presentati 7 diversi studi di configurazioni della cavità dove vengono esaminati gli effetti sulla trasmissione di calore della dimensione delle sorgenti, dell'aspect ratio, della presenza di uno o due ostacoli orizzontali o verticali di diversa lunghezza e della presenza di una quinta sorgente al centro

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6

Pradipta, Rezy. "Generation of acoustic-gravity waves in ionospheric HF heating experiments : simulating large-scale natural heat sources." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79031.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 203-208).<br>In this thesis, we investigate the potential role played by large-scale anomalous heat sources (e.g. prolonged heat wave events) in generating acoustic-gravity waves (AGWs) that might trigger widespread plasma turbulence in the ionospheric layer. The main hypothesis is that, the thermal gradients associated with the heat wave fronts could act as a source of powerful AGW capable of triggering iono

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7

Gaiser, Alfred O. "Natural convection liquid immersion cooling of high density columns of discrete heat sources in a vertical channel." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26097.

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8

Pradipta, Rezy. "Could global warming affect space weather? : case studies of intense ionospheric plasma turbulence associated with natural heat sources." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/44774.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.<br>Includes bibliographical references (p. 97-100).<br>We report on observations of a series of highly-structured ionospheric plasma turbulence over Arecibo on the nights of 22/23 and 23/24 July, 2006. Incoherent scatter measurements by Arecibo radar, airglow measurements using MIT PSFC's all-sky imaging system (ASIS), together with TEC measurements from GPS satellite network provide well-integrated diagnostics of turbulent plasma conditions. Two kinds of turbulent structures were seen as slan

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9

Лукичов, В. А. "Теплонасосна установка для опалювальних потреб на базі природних джерел теплоти". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/72247.

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У роботі визначено негативне теплове навантаження для розглянутого приміщення, реальні параметри первинного контуру з використанням (теплоти ґрунту, сонячної енергії, теплоти атмосферного повітря), виконано порівняння варіантів теплонасосного опалення по енергозатратам капітальним інвестиціям.<br>В работе определены негативное тепловая нагрузка для рассматриваемого помещения, реальные параметры первичного контура с использованием (теплоты грунта, солнечной энергии, теплоты атмосферного воздуха), выполнено сравнение вариантов теплонасосного отопления по энергозатраты капитальным инвестициям.<br

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10

Jansen, Adrian J. "Natural convection above a horizontal heat source." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA267212.

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11

Панкевич, О. Д., та Н. М. Слободян. "Шляхи зменшення споживання природного газу в системах теплопостачання за рахунок відновлюваних джерел енергії". Thesis, ВНТУ, 2018. http://ir.lib.vntu.edu.ua//handle/123456789/20982.

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В даній доповіді розкрита проблема необхідності зменшення споживання природного газу при опаленні будівель та шляхи вирішення цієї проблеми.<br>This report discloses the problem of the need to reduce the consumption of natural gas in the heating of buildings and ways to solve this problem.

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12

Svobodová, Veronika. "Návrh tepelného zdroje lokální soustavy CZT." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401565.

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The diploma thesis is focused on district heat supply, heat sources, machinery and safety equipment of boiler rooms. The main goal of the thesis is to modernize parts of the heat sources with the respective boiler room equipment in accordance with the latest available technology. The generated thermal energy is used for heating or hot water production for residential and non-residential buildings in the vicinity of the boiler room. In the theoretical part, the thesis focuses in more detail on boiler rooms, specifically on heat energy sources, machinery and safety equipment of boiler rooms, sys

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13

Chaengbamrung, Apichart. "Turbulent plumes generated by a horizontal area source of buoyancy." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060227.102144/index.html.

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14

Lall, Balwant. "Conjugate natural convection from a discrete heat source on a conducting plate in a shallow enclosure." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289741.

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Experiments were performed to characterize the conjugate heat transfer due to a square flush heat source mounted at the center of a square horizontal plate in a small horizontal enclosure. The plate area was six times larger than the heat source area. Three different plates with heat source facing upwards were considered: a 25mm balsa wood plate which provided a nearly adiabatic surface, a 1.57mm thick FR-4 plate with no copper, and a 1.57mm thick FR-4 plate with a single layer of 0.036mm thick copper cladding on source side. The back of the board was insulated for all cases. The experimental

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15

HUANG, KUAN-YU. "Fractal or Scaling Analysis of Natural Cities Extracted from Open Geographic Data Sources." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-19386.

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A city consists of many elements such as humans, buildings, and roads. The complexity of cities is difficult to measure using Euclidean geometry. In this study, we use fractal geometry (scaling analysis) to measure the complexity of urban areas. We observe urban development from different perspectives using the bottom-up approach. In a bottom-up approach, we observe an urban region from a basic to higher level from our daily life perspective to an overall view. Furthermore, an urban environment is not constant, but it is complex; cities with greater complexity are more prosperous. There are ma

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16

Mezon, Cécile. "Caractérisation des circulations thermo-convectives à l'échelle d'une zone fracturée par méthodes géophysiques et numériques." Thesis, La Réunion, 2017. http://www.theses.fr/2017LARE0002/document.

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La caractérisation des circulations thermo-convectives dans les milieux naturels est particulièrement étudiée pour ses applications industrielles, notamment en géothermie. Cette caractérisation correspond à deux enjeux liés à (i) la détection des remontées hydrothermales et (ii) la quantification de l'énergie évacuée par le système actif. La méthodologie proposée par cette thèse comporte ainsi deux volets. Le premier volet vise la localisation des systèmes actifs par caractérisation géophysique de sub-surface. Les techniques de prospection mises en œuvre sont la tomographie de résistivité élec

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17

Verma, Darpan. "Hybrid Solar Energy System with integrated Concentration Photovoltaic Cells and Thermoelectric Devices." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553613351859182.

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18

Ferreira, Dálglis Shilton Silva. "Simulação Numérica de Grandes Escalas da Convecção Natural em Cavidades Anulares com Fontes e Sumidouros de Calor." Universidade Federal de Uberlândia, 2017. http://dx.doi.org/10.14393/ufu.ufu.di.2018.48.

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FAPEMIG - Fundação de Amparo a Pesquisa do Estado de Minas Gerais<br>Atualmente nas indústrias é notória a presença de problemas envolvendo a dinâmica dos fluidos com transferência de energia térmica. Neste contexto, problemas onde a transferência de energia térmica ocorre sobre cilindros aquecidos merece um destaque especial. No presente trabalho objetivou-se desenvolver uma análise numérica tridimensional sobre o problema de transferência de energia térmica por convecção natural em cilindros concêntricos na presença de pares discretos de fonte-sumidouro de energia térmica, com ênfase no estu

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19

Miček, Denis. "Energy, economic and environmental analysis of balneotherapy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372007.

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The aim of this diploma thesis is to point out European Union´s goals such as low carbon economy, mainly future increasing the use of renewable sources as a potential source of energy. Slovak republic has due to its position in central Europe, rich in natural healing sources of water, which are considered as the most perspective sources of renewable energy in this country. The problem was solved as energy, economic and environmental analysis of Balneotherapy at Slovak Heath Spa Piešťany a.s. This analyzation was provided by real experimental measurement of temperature and flow rate and computa

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20

Wu, Kangfeng. "Sur l'instabilité thermo-convective avec source de chaleur interne." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL085N.

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On étudie le problème du déclenchement de la convection thermique d'un fluide conducteur de chaleur avec source interne de chaleur dans le cas d'un fluide confiné verticalement par 2 plans isothermes ou confiné à l'intérieur d'un cylindre de section circulaire. L’étude est faite par une analyse de la stabilité linéaire et par une simulation numérique directe. La solution de l'équation linéarisée est obtenue par une série formelle dans le cas d'un fluide entre deux plans. Dans le cas d'un fluide dans un cylindre, on applique la méthode de Galerkin pour résoudre les équations de perturbations. P

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21

Bernaz, Lucien. "Étude du transfert de chaleur à la frontière supérieure d'un bain fluide avec dissipation volumique de puissance." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10021.

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Le travail presente concerne une etude theorique et experimentale du transfert de chaleur a la frontiere superieure d'un bain liquide soumis a dissipation volumique de puissance (dans un regime de turbulence developpee). Le probleme est ramene a celui de la convention turbulente de rayleigh-benard (convection sans source interne de chaleur). Deux modes de transfert de chaleur sont recenses dans la litterature : le regime de turbulence faible et le regime de turbulence forte. L'approche theorique est basee sur une interpretation phenomenologique des ecoulements pariet aux responsables de la maj

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22

Gdhaidh, Farouq A. S., Khalid Hussain, and Hong Sheng Qi. "Numerical Study of Conjugate Natural Convection from Discrete Heat Sources." 2014. http://hdl.handle.net/10454/7860.

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no<br>The coupling between natural convection and conduction within rectangular enclosure was investigated numerically. Three separate heat sources were flush mounted on a vertical wall and an isoflux condition was applied at the back of heat sources. The governing equations were solved using control volume formulation. A modified Rayleigh number and a substrate/fluid thermal conductivity ratio were used in the range 10^4 −10^7 and 10−10^3 respectively. The investigation was extended to examine high thermal conductivity ratio values. The results illustrated that, when Rayleigh number increased

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23

Gdhaidh, Farouq A. S., Khalid Hussain, and Hong Sheng Qi. "Numerical Investigation of Conjugate Natural Convection Heat Transfer from Discrete Heat Sources in Rectangular Enclosure." 2014. http://hdl.handle.net/10454/8021.

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yes<br>The coupling between natural convection and conduction within rectangular enclosure was investigated numerically. Three separate heat sources flush mounted on a vertical wall and an isoflux condition was applied at the back of heat sources. Continuity, momentum and energy conservation equations were solved by using control volume formulation and the coupling of velocity and pressure was treated by using the “SIMPLE” algorithm. The modified Rayleigh number and the substrate/fluid thermal conductivity ratio were used in the range 𝑹𝒂𝒍𝒛∗=𝟏𝟎^𝟒−𝟏𝟎^𝟕 and 𝑹𝒔=𝟏𝟎−𝟏𝟎𝟎𝟎 respectively. The investigat

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24

Liu, Feng-Ping, and 劉鋒斌. "Numerical simulation of natural convection in an enclosure with three heat sources." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/40741181794949496682.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>95<br>A transient numerical method is developed to solve the coupled natural convection and heat conduction problem for three heat sources mounted on a conductive substrate in a three-dimensional enclosure filled with air. Three heat sources, are arranged in four different positions with iosthermal andinsulated walls. When Ra=1.7E+5 and Pr=0.7,the calculating results, show that different positioned arrangements strongly influence the temperature and velocity. The maximum relative temperature difference in the second stagger arrangement without heat sink is 15.48

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Bai, Jing-Jie, and 白景傑. "Three-Dimensional Computation of Natural Convection Problems for Protruding Heat Sources in a Cube." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/97rns7.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>90<br>A numerical method is developed to investigate the three-dimensional conjugate heat transfer of natural convection and conduction problems in a cubic enclosure. The Rayleigh number is selected between 10 to10 . The numerical method applied a finite-volume technique to solve the three -dimensional steady Navier-Stokes equations. The artificial compressible method, a third-order upwind finite volume method, DDADI time integration and an implicit residual smoothing were applied in the numerical method to achieve a higher-order accurate method. In this art

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26

Fu, Chang Yung, and 張永福. "Coupled Heat and Mass Transfer by Natural Convection from the Line Heat Sources in a Non-Darcian Porous Medium." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/51692518791149966356.

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碩士<br>遠東技術學院<br>機械研究所<br>92<br>The present study theoretically analyzes a couple heat and mass ransfer by natural convection from the line sources embedded in a non-Darcian porous medium. The contents focus on the two physical models: (1) The natural convection by the free plume in a non-Darcian porous medium (convective and inertia effect included.). (2) The natural convection by the wall plume in a non-Darcian porous medium boundary, convective and inertia effect included.). By employing similarity analysis, there is no existence of similarity solution for the governing equations with the no

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27

Huang, Ci-Ming, and 黃啟銘. "Natural Convection Heat Transfer Characteristics and cooling Performance Enhancement for a Module with Block Heat Sources in a Three Dimensional Cabinet." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/sm6btd.

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碩士<br>國立虎尾科技大學<br>航空與電子科技研究所<br>97<br>This study aims to investigate natural convection heat transfer characteristics and cooling performance enhancement for a module with block heat sources in a three dimensional cabinet. The major objective of this study has two aspects. First, efforts are performed to examine the influences of thermal interaction between the fluids inside and outside the cabinet on the flow structure, temperature distribution and Nu number. Second, air vents are proposed to construct in the three dimensional cabinet wall, attentions are paid to conduct the enhancement of co

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Knight, Daniel L. "Natural convection liquid immersion cooling of a column of discrete heat sources in a vertical channel." Thesis, 1988. http://hdl.handle.net/10945/23323.

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Jung, Inyeop. "Geometric location and power distribution for discrete heat sources on a vertical flat plate with natural convection." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3750.

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The current development of consumer electronics, driven by the effort to manufacture smaller products with increased performance, has amplified the chance for inducing higher thermal stresses to these systems. In an effort to devise more effective cooling methods for these systems, many scholars have studied the convective cooling of discrete heating elements. This report discusses a methodology for fabricating and testing a suitable flat plate design with discrete heating elements for both natural and forced convection cooling experiments. There were two plate design attempts: (i) an aluminum

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Chiu, Zone-Pin, and 邱琮評. "Natural Convective Heat Transfer Characteristics and Cooling Performance Enhancement for a Module with Arrays of Block Heat Sources in the Three Dimensional Cabinets." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/qz9qt3.

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碩士<br>國立虎尾科技大學<br>航空與電子科技研究所<br>98<br>The study aims to investigate the natural convective heat transfer characteristics and cooling performance enhancement for a module mounted with arrays of discrete block heat sources in a three dimensional cabinet. The major objective of this study has three aspects. First, efforts are performed to investigate the influence of thermal interaction between the streams inside and outside the cabinet on the natural convective heat transfer characteristics for the heat source module. Second, attention is given to investigate the cooling performance enhancement

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31

Liu, Bo-Hong, and 劉柏宏. "Natural Convection in an Enclosure with various configurations of heat source." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/68150925605488141421.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>99<br>The effect of the natural convection in an enclosure with various configuration of heat source was investigated in this study. In this study, the powerful Fluent software package was used to simulate, analyze and solve both the flow and temperature fields and the heat transfer in the enclosure. The research focuses on the various arrangements of the rectangular enclosure by locating the heat source on the left vertical wall with different positions and sizes, and the heat sink on the right wall with fixed size but varying position. The two horizontal wa

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Lin, Yu-Cheng, and 林育成. "Control of Natural Convection in a square enclosure with a Heat Source." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94650375451391016406.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>99<br>This article is to analyze the behavior of flow fields in a the enclosed cavity. Numerical simulation analysis using CFD method to simulate the confined cavity is the main topic in this study. This research investigates the natural convection caused by differential temperature difference in the enclosed cavity. The system studied is constructed with two vertical walls, with heated wall in the lift-hand side and cold in the right-hand sided, two horizontal walls, with insulation wall on the top, and the bottom wall embedded with a heat source. The fluids

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HU, SONG-HAO, and 胡松豪. "Effects of Plate Separation on Natural Heat Transfer for a Square Heat Source on the Bottom Plate." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3dn2pe.

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碩士<br>逢甲大學<br>機械與電腦輔助工程學系<br>106<br>The purpose of the study was to discuss the effect of the distance between two plates on the natural convection of rectangular heat source by numerical method. I am using the Fluent software to simulate. The purpose of this study change Ra、the distance between two plate (ε) and the aspect ratio of rectangular heat source (σ), and using temperature chart, streamline diagram, velocity diagram and local/average Nusselt number observe changes in heat transfer. The findings of this study indicate the following. (1) With the increase of the Rayleigh number (Ra

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Hung, Chih-Jen, and 洪智仁. "Effect of the Heat Source Locations on the Natural Convection in a Square Enclosure." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/28488052547175267101.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>99<br>This research focuses on figuring out the natural convection heat transfer in a square enclosure by using CFD simulation analysis with the Fluent commercial packaged software. The coupling between velocity and pressure in the momenturn equation is solved by Simple algorithm. The space differential is using the first-order upwing scheme. So that we can investigate the effects of heat convection efficiency in the square enclosure through varying Rayleigh number, inclined angle, partition, and arrangement of heat sources and sinks. The surfaces of both the

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35

Yang, Hong-Huei, and 楊鴻輝. "Experimental Study on Natural Convection Heat Transfer of Indirect Water Cooling System with Single Linear Heat Source in a Circular Tunnel." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/52172077491193031459.

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碩士<br>臺灣大學<br>機械工程學研究所<br>98<br>Natural convection heat transfer in a circular enclosure has been developed for a long time. One of many applications is cooling system of underground cable tunnels. For Taiwan, We lack for experiences of building underground cable tunnels. We need more literatures to provide a lot of information for structuring underground cable tunnels. In underground cable tunnels, a part of electric energy is dissipated by electrical cable so the cooling-water system is needed. In this research the circular tunnel made of concrete was used to simulate underground cable tunne

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36

Basha, Omar 1988. "Modeling of LNG Pool Spreading and Vaporization." Thesis, 2012. http://hdl.handle.net/1969.1/148176.

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In this work, a source term model for estimating the rate of spreading and vaporization of LNG on land and sea is introduced. The model takes into account the composition changes of the boiling mixture, the varying thermodynamic properties due to preferential boiling within the mixture and the effect of boiling on conductive heat transfer. The heat, mass and momentum balance equations are derived for continuous and instantaneous spills and mixture thermodynamic effects are incorporated. A parameter sensitivity analysis was conducted to determine the effect of boiling heat transfer regimes, fri

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Monyamane, Phillip Lesetja. "The nature, assessment and quantification of medical expenses as a head of delictual damage(s)." Diss., 2013. http://hdl.handle.net/10500/13103.

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Medical expenses refer to all medical and related expenditure reasonably incurred in respect of bodily injuries sustained. This then constitutes the primary loss in incidences of bodily injuries. However, it is accepted that bodily injuries infringe in the main the non-patrimonial aspects of the individual’s bodily integrity which is a personality right. Notwithstanding this trite provision of our law, the dissertation contends that medical expenses as a head of damages is inherently patrimonial. In essence, the true nature of medical expenses as a loss that ultimately affects both the patrimo

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