Thèses sur le sujet « Coupled energy systems »
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Ezanno, Philippe. « Vibration localization and statistical energy analysis in coupled systems ». Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06112009-063056/.
Texte intégralLiu, Daerhan. « Novel Strongly Coupled Magnetic Resonant Systems ». FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3717.
Texte intégralPardo, García Nicolás. « Energy efficiency improvement of hybrid ground coupled HVAC systems from thermal energy generation and storage management ». Doctoral thesis, Universitat Politècnica de València, 2009. http://hdl.handle.net/10251/6065.
Texte intégralPardo García, N. (2009). Energy efficiency improvement of hybrid ground coupled HVAC systems from thermal energy generation and storage management [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/6065
Palancia
Lutz, Michael [Verfasser], et André [Akademischer Betreuer] Thess. « Coupled metal hydride systems for energy storage / Michael Lutz ; Betreuer : André Thess ». Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2021. http://d-nb.info/1234452863/34.
Texte intégralHeidel, Timothy David. « Tradeoffs between revenue enhancements and emissions reductions with energy storage-coupled photovoltaics ». Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/52755.
Texte intégralThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 111-114).
Energy storage has the potential to dramatically change the operation of photovoltaics by allowing for a delay between generation and use. This flexibility has the potential to impact both the revenue from generating electricity using photovoltaics and the associated emissions reductions. This thesis attempts to quantify the impacts of adding energy storage to photovoltaics. The thesis formulates an optimization problem to solve for the optimal use of photovoltaics with energy storage from 2000 to 2005 in New England. The optimization is first solved using perfect information about historical solar generation, energy prices, and marginal emissions rates. Then, the model is solved using forecasted energy prices and emissions rates. The analysis finds that adding energy storage to photovoltaics can increase annual revenues by over 30%. With energy storage capacity and power equal to solar capacity, annual revenues were found to increase between 19.3% and 31.1% with an energy storage efficiency of 100%. Unfortuneately, the potential revenue increases were found to fall to between 9.1% and 21.3% with 80% efficient storage and between 3% and 14.5% with 60% efficient storage. However, when owners utilize energy storage to maximize revenue, the changes in avoided emissions with energy storage are found to be negligible. Alternatively, it is possible to achieve significant increases in the emissions offset by photovoltaics with energy storage. However, when energy storage is utilized to maximize emissions reductions, revenue decreases.
(cont.) This tradeoff between the economic and environmental benefits that can be achieved when energy storage is added to photovoltaics means it is unlikely to be possible, without policy, to simultaneously achieve large increases in both revenue and avoided emissions. Policy mechanisms could be used to enable energy storage to enhance both the revenue from photovoltaics and avoided emissions.
by Timothy David Heidel.
S.M.in Technology and Policy
Kyriakodis, Georgios-Evrystheas. « Development of a coupled simulation tool for urban building energy demand, district energy systems and microclimate modeling ». Thesis, La Rochelle, 2020. http://www.theses.fr/2020LAROS028.
Texte intégralThis PhD work investigates the complex links between urban physical processes, through the development of coupled simulation platforms to account simultaneously for building energy demand, individual or district energy systems, and urban microclimate. The spatial and temporal scales correspond to urban neighborhoods under explicit geometries, and annual simulations respectively. Several coupling strategies have been evaluated, regarding thermal efficiency indicators, and the determination of the diversity of coupled phenomena. The synchronous coupling schemes can effectively assess the dynamical interactions between buildings and the local microclimate. Nevertheless, the coupling variable is sensitive to the thermal properties of the building. The simplification of the urban canopy layer to a single-node description reveals significant variability in building energy demand. Besides, the developed model has been employed to assess the thermal performance of an urban neighborhood in La Rochelle. The transition from local energy systems to the district energy network eliminates anthropogenic heat from buildings, and improves the outdoor thermal comfort conditions, acting as a local heat island mitigation strategy. However, it is associated with an energy penalty due to the ground losses of the piping circuit. This energy penalty is amplified when a passive mitigation strategy (cool materials) is implemented concurrently
Munoz, Guevara Jules Ricardo. « Optimization Strategies for the Synthesis / Design of Hihgly Coupled, Highly Dynamic Energy Systems ». Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29251.
Texte intégralPh. D.
Tomasi, Roberta. « Energy performance, comfort and ventilation effectiveness of radiant systems coupled with mechanical ventilation ». Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422467.
Texte intégralIn questo lavoro di dottorato vengono presentati i risultati di uno studio sui sistemi radianti per il raffrescamento ed il riscaldamento in ambito civile e sulla loro integrazione con opportuni sistemi di ventilazione meccanica. Le prestazioni energetiche in regime stazionario e transitorio, così come le prestazioni di comfort termico e di qualità dell’aria garantita, sono state studiate mediante l’ausilio di prove sperimentali, di simulazioni fluidodinamiche e di altri codici di calcolo. Gli studi sperimentali sono stati realizzati in parte in Italia, presso i laboratori dell’azienda RHOSS S.p.A di Codroipo (Udine), e in parte presso i laboratori dell’ICIEE (International Centre for Indoor Environment and Energy), dell’Università Tecnica di Danimarca, (DTU) a Lyngby (DK). L’aspetto più rilevante di questo lavoro è legato alla sempre maggiore diffusione dei sistemi radianti come soluzione per il riscaldamento ed il raffrescamento di ambienti interni, in quanto combinano vantaggi energetici ad elevati livelli di comfort termico. Per ragioni dovute alla piccola differenza di temperatura tra l’ambiente e il fluido termovettore, i sistemi radianti si interfacciano molto bene con caldaie a condensazione, pompe di calore, sistemi free cooling, collettori solari e altre sorgenti rinnovabili e soluzioni ad alta efficienza energetica. Il calcolo della resa termica di tali sistemi viene eseguito mediante le equazioni valide per la convezione in regime stazionario, come quelle fornite dalle norme Europee EN 1264 ed EN 15377. In letteratura esistono numerose correlazioni valide per il calcolo della potenza convettiva di superfici orizzontali e verticali e di superfici interne di stanze reali; le norme EN 1264 ed EN 15377 consigliano correlazioni diverse e lo stesso accade per codici si simulazione energetica degli edifici. Ad oggi non è disponibile una chiara definizione di coefficiente di scambio termico convettivo per i sistemi radianti, specialmente per quanto riguarda pavimenti freddi e soffitti caldi. Il primo obiettivo di questa tesi è stato di realizzare un’analisi critica delle correlazioni disponibili in letteratura adatte ai sistemi radianti e di proporre delle equazioni per ogni configurazione di riscaldamento o raffrescamento da soffitto, pavimento o parete. In ambito residenziale il pavimento radiante rappresenta una delle soluzioni più richieste grazie all’elevato livello di comfort termico garantito; tuttavia, al fine di migliorare la qualità dell’aria e specialmente a causa della necessità di deumidificare l’aria in estate per evitare formazione di condensa, accanto al sistema radiante andrebbe installato un sistema di ventilazione meccanica. L’aria primaria in estate è solitamente a temperatura più bassa della temperatura della stanza e dotata di una certa velocità; nel caso di immissione da bocchette installate vicino ad una superficie radiante, lo scambio convettivo potrebbe venire variato rispetto ad una soluzione senza ventilazione. Mediante uno studio con simulazioni fluidodinamiche CFD è stato possibile valutare l’incremento dello scambio convettivo da un soffitto freddo mediante lo sfruttamento di aria primaria. I sistemi radianti, in particolare i sistemi a soffitto, rappresentano un’ottima soluzione per rimuovere i carichi termici degli uffici durante il periodo estivo, ma allo stesso tempo possono essere usati per il riscaldamento invernale degli stessi con buone prestazioni energetiche e di comfort termico. La differenza sostanziale è che durante la stagione invernale il sistema radiante si trova a lavorare prevalentemente in regime stazionario, mentre durante la stagione estiva i carichi esterni dovuti alla radiazione solare e all’escursione diurna, accompagnati da carichi interni dovuti all’occupazione umana, determinano condizioni piuttosto variabili durante la giornata. Il comportamento di sistemi radianti a regimi stazionari e transitori sono state studiate mediante prove in camera climatica; inoltre un modello di calcolo chiamato Digithon, sviluppato all’interno del Dipartimento di Fisica Tecnica dell’Università di Padova, è stato validato mediante un confronto con dati sperimentali. Seguendo un’opportuna procedura, riportata nella tesi, è stato possibile impostare dei profili di carico che simulano una tipica giornata estiva o invernale su una parete della stanza ed è stato studiato come il soffitto radiante reagisca per cercare di mantenere una certa temperatura di comfort nella stanza. Al fine di mantenere una buona qualità dell’aria, evitare la formazione di condensa, ma anche per incrementare la capacità di raffrescamento quando richiesto, i sistemi radianti per gli uffici andrebbero sempre associati a sistemi di ventilazione meccanica. Accanto ai tradizionali sistemi a soffitto con ventilazione a miscelazione, le soluzioni con ventilazione a dislocamento accoppiate a sistemi a pavimento o a soffitto sono alternative di crescente interesse per gli uffici. In edifici dove sia bassa la quantità di inquinanti emessi dai materiali edili, dai mobili e dalle attrezzature, la quantità di bioeffluenti dagli occupanti, dei quali l’anidride carbonica CO2 è normalmente usata come principale indicatore, è determinante per la qualità dell’aria interna. La capacità di rimozione dei contaminanti e, parallelamente, la capacità di immettere aria pulita negli ambienti sono espresse dall’efficienza di ventilazione (ventilation effectiveness). Mediante simulazione fluidodinamiche CFD è stato possibile confrontare l’efficienza di rimozione dei contaminanti utilizzando diverse soluzioni di ventilazione a dislocamento piuttosto che soluzioni tradizionali a miscelazione. La qualità di un ambiente interno andrebbe misurata in termini sia di comfort termico garantito all’occupante che di qualità dell’aria. Attraverso prove sperimentali in laboratorio, i principali indici di comfort termico e di efficienza di ventilazione sono stati determinati per diverse configurazioni di ventilazione a miscelazione e di ventilazione a dislocamento in ambienti rappresentativi di applicazioni residenziali o del terziario. I risultati sono stati in seguito utilizzati per effettuare una validazione di un modello fluidodinamico (CFD) creato per la previsione del movimento dell’aria in ambienti residenziali o uffici.
Hu, Hao. « Optimal and Miniaturized Strongly Coupled Magnetic Resonant Systems ». FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3024.
Texte intégralSchroeder, Ryan T. « Gait entrainment in coupled oscillator systems : Clarifying the role of energy optimization in human walking ». Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2020. https://ro.ecu.edu.au/theses/2281.
Texte intégralYoung, Elizabeth R. (Elizabeth Renee) 1980. « Spectroscopic investigation of photo-induced proton-coupled electron transfer and Dexter energy transfer in model systems ». Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/49750.
Texte intégralVita.
Includes bibliographical references.
Spectroscopic investigations of systems designed to advance the mechanistic interrogation of photo-induced proton coupled electron transfer (PCET) and proton-coupled (through-bond) energy transfer (PCEnT) are presented. PCET is ubiquitous in Nature, where it is at the heart of bioenergy conversion and catalysis (Chapter I). Systems of relevance to mechanistic studies of PCET and PCEnT are the central tenet of this work. In uni-directional PCET, electron transfer (ET) occurs from an electron donor (De) to an electron acceptor (Ae) through a hydrogen bonded proton interface. The proton interface plays a vital role in mediating ET. Thus, the exact ionization configuration of the interface must be uncovered to fuIIy realize the influence of the interface. SpecificaIIy, does the interface exists in the non-ionized (i.e. amidine-carboxylic acid) or ionized (i.e. amidinium-carboxylate) form. Strategies to spectraIIy monitor the interface ionization state by extending electronic communication from a porphyrinic chromophore to its pendant amidinium functionality are pursued through examination of an alkynylamidinium Ni(II) porphyrin (Chapter II) and an amidinium appended Zn(II) purpurin (Chapter III). With the ionization state of the interface resolved, mechanistic studies of photo-induced PCET between an identical De and Ae pair juxtaposed by a non-ionized (amidine-carboxylic acid) and an ionized (amidinium-sulfonate) interface are undertaken to reveal that PCET occurring through an ionized interface is more strongly coupled to the surrounding solvent environment (Chapter IV). Work on this system is extended to a second solvent of similar dielectric constant to establish that molecular variation of the solvent environment impacts PCET, likely through its interaction with the proton interface (Chapter V). Two water-soluble amidinium-appended ferrocene moieties are presented as building blocks for aqueous bi-directional PCET in which PT occurs to the bulk and ET occurs along a covalently bound coordinate (Chapter VI). ET and through-bond EnT are described by the semiclassical nonradiative decay formalism, meaning both processes should be sensitive to an intervening proton network. For the first time, PCEnT is established using ferrocenyl-amidine moieties bound through an amidinecarboxylic acid interface to Ru(II) polypyridyl complexes (Chapter VII).
Elizabeth R. Young.
Ph.D.
Mitchell, Steven J. « The Development of a Steel Fuse Coupling Beam for Hybrid Coupled Wall Systems ». University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368026875.
Texte intégralLazaro, Orlando. « CMOS inductively coupled power receiver for wireless microsensors ». Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51874.
Texte intégralReimuth, Andrea [Verfasser], et Wolfram [Akademischer Betreuer] Mauser. « The role of residential photovoltaic-coupled battery storages in the energy system from a regional perspective : a spatiotemporal assessment of residential photovoltaic and battery storage systems and their effects on the energy flows / Andrea Reimuth ; Betreuer : Wolfram Mauser ». München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1223849937/34.
Texte intégralParada, Giovanny A. « Synthesis of Biomimetic Systems for Proton and Electron Transfer Reactions in the Ground and Excited State ». Doctoral thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-251471.
Texte intégralMallégol, Antoine. « Optimisation multi-objectifs de systèmes énergétiques couplés : méthodes exactes et approchées ». Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2023. http://www.theses.fr/2023IMTA0383.
Texte intégralAn energy system is a set of infrastructures and technologies that allow for the production, storage, and distribution of energy. Coupled energy systems include multiple energy vectors, such as electricity and heat, and interactions can occur between these forms of energy. Optimization of these systems allows for the best possible design and operation of energy generation and storage, with various objectives that can be linked to cost or the environmental impact of the system. In this work, we model and optimize a coupled energy system over a long period of time (one year), with a high temporal resolution. In parallel, we take into account non linearities in the equations that govern the electrical efficiency of cogeneration and those describing thermal storage. We incrementally propose different resolution methods, ranging from a mathematical program to a matheuristic, through an heuristic. We show the interest of these approaches for reducing the costs of these systems, while increasing the proportion of renewable energy sources
Piechowski, Miroslaw. « A ground coupled heat pump system with energy storage / ». Connect to thesis, 1996. http://eprints.unimelb.edu.au/archive/00000724.
Texte intégralStelzer, Rainer. « Une méthode énergétique pour les systèmes vibro-acoustiques couplés ». Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00780602.
Texte intégralRansley, Edward Jack. « Survivability of wave energy converter and mooring coupled system using CFD ». Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3503.
Texte intégralERDMAN, Paolo Andrea. « Quantum Thermal Machines ». Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/95512.
Texte intégralAlghamdi, Jamal Khaled. « CFD Simulation Methodology for Ground-Coupled Ventilation System ». Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35736.
Texte intégralMaster of Science
Alfadil, Mohammad Omar. « Design Tool for a Ground-Coupled Ventilation System ». Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100604.
Texte intégralDoctor of Philosophy
McDaniel, Matthew Lee. « Proposed Design for a Coupled Ground-Source Heat Pump/Energy Recovery Ventilator System to Reduce Building Energy Demand ». Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/33610.
Texte intégralMaster of Science
Melo, Júnior José Carlos de Albuquerque. « On linearly coupled systems of Schrödinger equations with critical growth ». Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9316.
Texte intégralMade available in DSpace on 2017-08-25T13:08:29Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1324370 bytes, checksum: 6a689c99393e6b9a2a7f27c49ef07a8d (MD5) Previous issue date: 2017-02-24
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In thisworkwestudytheexistenceofgroundstatesforthefollowingclassofcoupled systems involvingnonlinearSchrödingerequations 8<: u + V1(x)u = f1(x; u) + (x)v;x 2 RN; v + V2(x)v = f2(x; v) + (x)u; x 2 RN; where thepotentials V1 : RN ! R, V2 : RN ! R are nonnegativeandrelatedwith the couplingterm : RN ! R by j (x)j < pV1(x)V2(x), forsome 0 < < 1. In the case N = 2, thenonlinearities f1 e f2 havecriticalexponentialgrowthinthesense of Trudinger-Moserinequality.Inthecase N 3, thenonlinearitiesarepolynomials with subcriticalandcriticalexponentintheSobolevsense.Westudyalsothefollowing class ofnonlocalcoupledsystems 8<: ( )1=2u + V1(x)u = f1(u) + (x)v;x 2 R; ( )1=2v + V2(x)v = f2(v) + (x)u; x 2 R; where ( )1=2 denotes thesquarerootoftheLaplacianoperatorandthenonlinearities havecriticalexponentialgrowth.Ourapproachisvariationalandbasedon minimization techniqueovertheNeharimanifold
Neste trabalhoestudamosaexistênciadegroundstatesparaaseguinteclassede sistemas acopladosenvolvendoequaçõesdeSchrödingernão-lineares 8<: u + V1(x)u = f1(x; u) + (x)v;x 2 RN; v + V2(x)v = f2(x; v) + (x)u; x 2 RN; onde ospotenciais V1 : RN ! R, V2 : RN ! R são não-negativoseestãorelacionados com otermodeacomplamento : RN ! R por j (x)j < pV1(x)V2(x), paraalgum 0 < < 1. Nocaso N = 2, asnão-linearidades f1 e f2 possuemcrescimentocrítico exponencialnosentidodadesigualdadedeTrudinger-Moser.Nocaso N 3, asnão- linearidades sãopolinômioscomexpoentesubcríticoecríticonosentidodeSobolev. Estudamos aindaaseguinteclassedesistemasacopladosnão-locais 8<: ( )1=2u + V1(x)u = f1(u) + (x)v;x 2 R; ( )1=2v + V2(x)v = f2(v) + (x)u; x 2 R; onde ( )1=2 denota ooperadorraízquadradadolaplacianoeasnão-linearidades possuemcrescimentocríticoexponencial.Nossaabordagemévariacionalebaseadana técnica deminimizaçãosobreavariedadedeNehari.
Chen, Hao. « Modeling and control of a marine current energy conversion system using a doubly salient permanent magnet generator ». Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=83aa318a-2539-4dda-aa76-c57351bf6c09.
Texte intégralSeveral techniques to extract and exploit ocean energy have been recently suggested. The most studied ones are: marine current energy, wave energy and ocean ̐thermal energy. This Ph. D. Thesis fits in this context and its main objective is to contribute on control and modelling of a Marine Current Energy Conversion System (MCECS). This requires multi-physics modelling from the hydrokinetic resource to the electricity grid, design and control of an innovative low speed non-conventional generator and its associated power electronic interfaces. At first, turbine concepts, relative projects and usual chain of tidal energy conversion are presented. Tidal current and turbine modelling are secondly addressed. The dynamic modelling of a low speed Double Salient Permanent Magnet Generator (DSPMG) based on finite element method and Park transformations is developed. Results are compared to classical Permanent Magnet Synchronous Generator (PMSG) to highlight advantages, originality, complexity and principal characteristics of the proposed structure. Suitable currents are then determined and tested by simulation in order to deliver a quasi-constant torque and minimise Joule losses. The mutual effect on the generator performances is detailed. Finally, several control strategies are applied to DSPMG associated to a bidirectional back-to-back converter and are analysed. The main results, based on the developed marine current turbine simulation tool, are presented and discussed with illustration by several realistic studies and Matlab/Simulink assessment
Hassan, Najeeb ul, Ali E. Pusane, Michael Lentmaier, Gerhard P. Fettweis et Daniel J. Costello. « Reduced Complexity Window Decoding Schedules for Coupled LDPC Codes ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-105936.
Texte intégralHassan, Najeeb ul, Ali E. Pusane, Michael Lentmaier, Gerhard P. Fettweis et Daniel J. Costello. « Reduced Complexity Window Decoding Schedules for Coupled LDPC Codes ». Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26634.
Texte intégralMohd, Thiyahuddin Mohd Izzat. « Experimental and numerical characteristics of portable water-filled road safety barrier system under different impact conditions ». Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/71458/1/Mohd%20Izzat_Mohd%20Thiyahuddin_Thesis.pdf.
Texte intégralSmilek, Jan. « Energy Harvesting Power Supply for MEMS Applications ». Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-386765.
Texte intégralAyele, Getnet Tadesse. « Exploiting the synergies from coupled electricity and heat distribution networks : modelling, simulation and optimization based on an extended energy hub approach ». Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0215.
Texte intégralRecent literature shows that there is a significant potential of decarbonisation and efficiency improvement that can be achieved through the synergy from multi-energy systems (MESs). Coupling technologies, such as co-generation plants, heat pumps and thermal storages are widely recommended as means of unlocking additional flexibility and increasing the penetration of renewables in the heating and electricity sectors. In view of that, the size and number of coupling technologies, such as combined heat and power plants and heat pumps (HPs), being installed in the heat distribution networks are increasing. As these technologies are exclusively managed by the district heating network operators, their operation sometimes becomes suboptimal from the electricity network point of view, and they (in particular large HPs) may cause overloading of the low voltage electricity distribution networks. Integrated simulation and optimisation models are required to exploit the synergies effectively without compromising the constituent distribution networks of MES. Such models are not yet well developed. The conventional single-energy-carrier simulation tools are not capable of capturing key operating parameters of the multi-carrier distribution networks either. A novel methodology for simulation and optimisation of MES is developed in this thesis based on an Extended Energy Hub (EEH) approach. The general framework is first developed in modular form so that it can be easily adapted for any type of multi-carrier energy networks. The framework is then used to develop the details of an integrated load flow model governing coupled heating and electricity distribution networks. Various load flow case studies with radial and meshed topologies are considered for demonstration and numerical validation of the proposed model. The load flow model is further combined with a particle swarm optimisation algorithm in order to conduct integrated optimal power flow studies. Its contribution to the state of art is demonstrated by studying the optimal placement of coupling technologies, such as HPs and boilers in coupled heating and electricity distribution networks. The capacity of the model is further illustrated by exploiting the synergies using HPs together with thermal storage in the presence of intermittent renewables and variable electricity price signal. It is shown that the EEH-based simulation and optimisation methodologies proposed in this thesis are very effective, flexible and easily scalable in capturing the key operating parameters of integrated electricity and district heating networks. The models can be used as a platform for further studies on integration of smart grids and smart thermal networks
Kaplan, Marcus [Verfasser]. « Agent-based modeling of land-use changes and vulnerability assessment in a coupled socio-ecological system in the coastal zone of Sri Lanka / Marcus Kaplan ». Bonn : Universitäts- und Landesbibliothek Bonn, 2011. http://d-nb.info/1016145586/34.
Texte intégralHamidouche, Ziad. « Modeling and numerical simulation of coupled reactive fluidized beds in a Chemical Looping Combustion system ». Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/17921/1/hamidouche.pdf.
Texte intégralMarion, Candice. « Novel insights on ghrelin receptor signaling in energy homeostasis and feeding behavior using the GhsrQ343X mutant rat model ». Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCB109.
Texte intégralThe stomach-derived hormone acyl ghrelin promotes body weight gain, mostly in the form of fat mass, by means of several central and peripheral mechanisms mediated by the growth hormone secretagogue receptor (GHSR). The GHSR is a G protein-coupled receptor that, in addition to respond to acyl ghrelin, displays agonist-independent signaling through high constitutive activity and possibly heteromerization with dopamine receptors. Despite the potent biological properties of exogenous acyl ghrelin, the lack of animal models able to apprehend the complexity of the acyl ghrelin-GHSR system in vivo has been hampering the elucidation of its physiological roles. Indeed, genetic mouse models generated so far lack specificity either at the level of the hormone (not able to discriminate between acyl ghrelin versus desacyl ghrelin) and/or at the level of the GHSR (not able to discriminate between GHSR signaling modes). In this context, new models differentially affecting GHSR signaling pathways would represent valuable tools to decipher the acyl ghrelin-GHSR system in vivo. We therefore aimed at characterizing a new rat model carrying a point mutation in Ghsr that predicts truncation of a regulatory domain in the C-terminus, the GhsrQ343X mutation. In cellular models, this mutation was found to uncouple the GHSR from agonist-dependent receptor internalization and β-arrestin recruitment, while enhancing GHSR responsiveness in the G protein pathway. Accordingly, homozygous mutant GhsrM/M rats show enhanced responsiveness to exogenous GHSR agonists in terms of growth hormone release, food intake and locomotor activity. Physiological and behavioral exploration of GhsrM/M rats supports that the GhsrQ343X mutation is associated with increased body weight gain and adiposity independently of calorie intake, reduced whole-body fat oxidation, metabolic flexibility and glucose tolerance, without any critical impact on homeostatic feeding behavior. Moreover, given that circulating ghrelin levels are not increased by the GhsrQ343X mutation, the overall metabolic phenotype of GhsrM/M rats is consistent with enhanced GHSR sensitivity to the endogenous tone of acyl ghrelin. Furthermore, preliminary results suggest that the GhsrQ343X mutation could be associated with behavioral alterations related to reward and memory functions, through mechanisms that remain to be elucidated. Altogether, we propose the GhsrQ343X mutant rat model as a novel tool, more specific than knockout mouse models in its mechanism-of-action, to explore GHSR signaling across biological functions in vivo, and ultimately help in the design of efficient GHSR-targeting drugs
Raymond, Alexander William. « Investigation of microparticle to system level phenomena in thermally activated adsorption heat pumps ». Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34682.
Texte intégralSandoval, reyes Mexitli Eva. « Methodology to identify the key variables driving the techno-economic feasibility of Trigeneration – Thermal Storage systems ». Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0182.
Texte intégralTrigeneration systems with thermal storage (CCHP-TS) contribute to the distributed generation of energy and the reduction of greenhouse gas emissions. Nevertheless, it is important to assess their techno-economic feasibility to ensure long-term implementation. Moreover, determining and characterizing the influential variables is essential to identify the most viable application fields. Potentially, this could foster the interest of project managers, investors, and policymakers, therefore encouraging the adoption of this technology. Several authors suggest that energy prices and loads are important variables for the techno-economic feasibility of CCHP-TS systems. Particularly they have explored the Spark Spread rate, a ratio between the cost of electricity from the grid and the CHP fuel. However, just a few studies are assessing the prices and loads together, with some limitations in their model, the technology analyzed, or even the resolution of the loads. As the literature reveals that energy prices and loads size are important variables, this study aims to analyze two hypotheses proposed: 1) There is a combination of energy prices and the size of the annual energy loads that makes techno-economically feasible a CCHP-TS system; 2) The energy prices (electricity and natural gas) should be considered separately instead of consolidating them into the spark spread rate (SS). The analysis is divided into two phases. The first one is an exploratory analysis aiming to demonstrate that the model for CCHP-TS is relevant and sensitive to the variables of analysis (energy prices and loads). The second is a rigorous sensitivity analysis and the comparison of three approaches: Morris, Sobol, and VARS. The results state that energy prices and the annual size of the electric load are the most relevant variables on the feasibility of a CCHP-TS system. The order of relevance between the energy prices relies on the measure used for the economic performance: either absolute (expressed in the amount of savings [in US dollar(s)]) or relative (expressed in the percentage of savings [%]). But in both cases, the price of the fuel is the variable with the largest interaction effects. The methodology of the first phase incorporates tools such as full factorial design of experiments (DoE), DER-CAM simulation and optimization tool, and a novel combination of k-Means clustering and multicriteria decision making (MCDM). For the second phase, it is mainly the use of global sensitivity analysis methods and the adaptation of a CCHP-TS model into the programming language Python, using the optimization library PYOMO and the solver CPLEX. In this second phase, the implementation of the three sensitivity analysis methods allowed identifying their advantages and limitations. Moreover, this complementarity thereby reinforced the techno-economic feasibility analysis
Ercolanelli, Julien. « Étude numérique et expérimentale d'un système couplé stabilisateur et récupérateur d'énergie des vagues Experimental and numerical investigation of sloshing in anti-roll tank using effective gravity angle Experimental and numerical assessment of the performance of a new type passive anti-roll stabilisation system ». Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0008.
Texte intégralGeps Techno's development is based on an innovative concept of a floating structure intended to produce electrical energy from several renewable marine energy sources, including wave power. The wave power system developed by Geps Techno is based on circulating water and creating a vortex within it. By taking advantage of the liquid hull phenomenon, the concept can also be used as a stabilization system for a ship or any other floating platform. The short-term objective of the company is the development of this technology allowing the stabilization and recovery of wave energy and for which there remain technological obstacles to be removed in order to achieve the viability and profitability of the system. To do this, in October 2015 Geps Techno launched the IHES (Integrated Harvesting Energy System) project, which consists of building a demonstrator of its wave power platform concept. The IHES project is one of the projects of the roadmap of the "Ecological ships" plan of New Industrial France. It is supported by Bpifrance within the framework of the Investments for the Future - Industrial Projects for the Future program. In order to master the objectives of stabilization and energy recovery, Geps Techno is studying the technological aspects necessary to switch from the energy available at wave level to that available at the wave turbine turbine. The Ph.D. thesis work supported by Fourestier in May 2017 focused on a first part "Definition and control of internal flows in the wave power system". Using CFD modeling, the latter resulted in operational models characterizing internal flows. This Cifre Ph.D. thesis follows on from Fourestier's work and deals with a second part "Modeling of the coupled platform / wave power system". All of this work should lead to an operational computer code correlated with experimental results making it possible to study the internal flow and the behavior of the float subjected to swell
Norberg, Daniel. « Quantum Chemical Studies of Radical Cation Rearrangement, Radical Carbonylation, and Homolytic Substitution Reactions ». Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8178.
Texte intégralFriis, Cecilie. « Land use change in a globalised world ». Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18180.
Texte intégralThe global demand for land resources has increased the pressures on land, especially in resource-rich frontier regions. Transnational land acquisitions constitute one of these pressures that currently shape land use change and threaten land access and land-based livelihoods in rural areas. This thesis contributes to create a better understanding of the complex processes involved in such land acquisitions in two ways. First, it examines a recent boom in banana cultivation in Luang Namtha Province, Lao PDR driven by Chinese investors leasing land from Lao farmers and exporting the bananas to China. Second, it critically engages with the emerging telecoupling framework proposed in Land System Science as an analytical framework for dealing with distal causal interactions. Based on ethnographic fieldwork and using qualitative analyses, the thesis examines two plantations in a small village and traces the actors, mechanisms and processes driving the banana expansion. Using the telecoupling framework as a heuristic device, the study illuminates how multiple and co-constitutive economic, environmental, political and discursive interactions influence the banana expansion. Furthermore, the in-depth place-based analyses reveal how different contextual factors ground and shape these interactions in this particular location. In this case, the distal interactions are mediated through a cross-border network of Chinese investors with social ties in the local area, as well as in the fruit market in China. The study shows that the investors’ strategies to obtain access to the land combined with the resulting destructive land use conversion amount to an alienation of land from the villagers. By engaging empirically, methodologically and conceptually with the telecoupling framework, the thesis advances the discussion on telecoupling by demonstrating the value of qualitative analysis for capturing some of the more elusive and immaterial interactions, as well as potential feedbacks influencing land use change in a globalised world.
Bernard, Brian Patrick. « Wave Propagation in Nonlinear Systems of Coupled Oscillators ». Diss., 2014. http://hdl.handle.net/10161/9111.
Texte intégralMechanical oscillators form the primary structure of a wide variety of devices including energy harvesters and vibration absorbers, and also have parallel systems in electrical fields for signal processing. In the area of wave propagation, recent study in periodic chains have focused on active tuning methods to control bandgap regions, bands in the frequency response in which no propagating wave modes exist. In energy harvesting, several coupled systems have been proposed to enhance the peak power or bandwidth of a single harvester through arrays or dynamic magnification. Though there are applications in several fields, the work in this dissertation can all fit into the category of coupled non-linear oscillators. In each sub-field, this study demonstrates means to advance state of the art techniques by adding nonlinearity to a coupled system of linear oscillators, or by adding a coupled device to a nonlinear oscillator.
The first part of this dissertation develops the analytical methods for studying wave propagation in nonlinear systems. A framework for studying rotational systems is presented and used to design an testbed for wave propagation experiments using a chain of axially aligned pendulums. Standard analytical methods are also adapted to allow uncertainty analysis techniques to provide insight into the relative impact of variations in design parameters. Most analytical insight in these systems is derived from a linearlized model and assumes low amplitude oscillations. Additional study on the nonlinear system is performed to analyze the types of deviations from this behavior that would be expected as amplitudes increase and nonlinear effects become more prominent.
The second part of this dissertation describes and demonstrates the first means of passive control of bandgap regions in a periodic structure. By imposing an asymmetrical bistability to an oscillator in each unit cell, it is analytically shown that each potential well has different wave propagation behaviors. Experimental demonstrations are also provided to confirm the simulated results.
The final section performs analytical and numerical analysis of a new system design to improve the performance of a nonlinear energy harvester by adding an excited dynamic magnifier. It is shown that this addition results in higher peak power and wider bandwidth than the uncoupled harvester. Unlike standard dynamic magnifiers, this performance does not come at the expense of power efficiency, and unlike harvester arrays, does not require the added cost of multiple energy harvesters.
Dissertation
Ribeiro, José Luís Baía. « Integration and Optimization of Energy Data Analysis Systems ». Master's thesis, 2014. http://hdl.handle.net/10316/35610.
Texte intégralInternet of Things (IoT) is a concept that recently became mainstream with the launch of numerous consumer products, some of them dedicated to Home Energy Management. Due of its novelty and immaturity, IoT Platforms should be designed for change. This project aimed to provide an existing data analysis mechanism as a service to third-parties and enable the usage of custom energy management devices by an existing data monitoring application. To achieve this, a service-oriented system was created that allows third-parties to send energy consumption data and receive the classi cation's result as soon as possible, in isolation of the remaining system; an IoT communication protocol was used to allow energy management devices to send data in degraded network conditions and with low power consumption. This solution enables future projects of the company to reuse its components, such as the generic time-series storage platform developed in the process.
« Molecules for Energy and Charge Transfer for Biomimetic Systems : Synthesis, Characterization and Computational Studies ». Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.40346.
Texte intégralDissertation/Thesis
Doctoral Dissertation Chemistry 2016
Sen, Sangita. « Multi-reference coupled-cluster studies on the effect of dynamical and non-dynamical correlation on molecular energies and properties ». Thesis, 2019. http://hdl.handle.net/10821/8223.
Texte intégralResearch was carried out under the supervision of Prof. Debasish Mukherjee and Dr. Ankan Paul of RCAMOS under SCS [School of Chemical Sciences]
Research was conducted under grant of CSIR, India for the Shyama Prasad Mukherjee Fellowship, and DST, India. Also there are sponsorship from abroad , i.e. CEFIPRA/IFCPAR for funding academic visits to Toulouse, France, CTCC, Oslo, Norway.
Zheng, Tianyuan. « A fully coupled thermo-hydro-mechanical finite element model of freezing in porous media and its application for ground source heat pump systems ». Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A34033.
Texte intégralSmith, Keith Cameron. « Coupled Dynamic Analysis of Flow in the Inlet Section of a Wave Rotor Constant Volume Combustor ». 2011. http://hdl.handle.net/1805/2969.
Texte intégralA wave rotor constant volume combustor (WRCVC) was designed and built as a collaborative work of Rolls Royce LibertyWorks, Indiana University-Purdue University at Indianapolis (IUPUI), and Purdue University, and ran experimental tests at Purdue's Zucrow Laboratories in 2009. Instrumentation of the WRCVC rig inlet flow included temperature and pressure transducers upstream of the venturi and at the fuel delivery plane. Other instrumentation included exhaust pressures and temperatures. In addition, ion sensors, dynamic pressure sensors, and accelerometers were used to instrument the rotating hardware. The rig hardware included inlet guide vanes directly in front of the rotating hardware, which together with concern for damage potential, prevented use of any pressure transducers at the entrance to the rotor. For this reason, a complete understanding of the conditions at the WRCVC inlet is unavailable, requiring simulations of the WRCVC to estimate the inlet pressure at a specific operating condition based on airflow. The operation of a WRCVC rig test is a sequence of events over a short time span. These events include introduction of the main air flow followed by time-sequenced delivery of fuel, lighting of the ignition source, and the combustion sequence. The fast changing conditions in the rig inlet hardware make necessary a time-dependent computation of the rig inlet section in order to simulate the overall rig operation. The chosen method for computing inlet section temperature and pressure was a time-dependent lumped volume model of the inlet section hardware, using a finite difference modified Euler predictor-corrector method for computing the continuity and energy equations. This is coupled with perfect gas prediction of venturi air and fuel flow rates, pressure drag losses at the fuel nozzles, pressure losses by mass addition of the fuel or nitrogen purge, friction losses at the inlet guide vanes, and a correlation of the non-dimensional flow characteristics of the WRCVC. The flow characteristics of the WRCVC are computed by varying the non-dimensional inlet stagnation pressure and the WRCVC's operational conditions, assuming constant rotational speed and inlet stagnation temperature. This thesis documents the creation of a computer simulation of the entire WRCVC rig, to understand the pressure losses in the inlet system and the dynamic coupling of the inlet section and the WRCVC, so that an accurate prediction of the WRCVC rotor inlet conditions can be computed. This includes the computational development of the WRCVC upstream rig dynamic model, the background behind supporting computations, and results for one test sequence. The computations provide a clear explanation of why the pressures at the rotor inlet differ so much from the upstream measured values. The pressure losses correlate very well with the computer predictions and the dynamic response tracks well with the estimation of measured airflow. A simple Fortran language computer program listing is included, which students can use to simulate charging or discharging of a container.
Lozano, Adolfo. « Analysis of a novel thermoelectric generator in the built environment ». Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-4131.
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Mays, Mona Leila. « The study of interplanetary shocks, geomagnetic storms, and substorms with the WINDMI model ». 2009. http://hdl.handle.net/2152/10703.
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Michaud, Douce. « Effet de chaperones pharmacologiques sur les formes mutantes du récepteur mélanocortine de type 4 responsables de l'obésité morbide précoce ». Thèse, 2009. http://hdl.handle.net/1866/3347.
Texte intégralThe MC4R is a G-protein coupled receptor involved in the central regulation of food intake and energy homeostasis. Eighty percent of childhood obesity-related MC4R mutants are retained intracellularly, probably via the quality control system acting on misfolded receptors. Thus, rescuing cell surface targeting and functionality of these mutant receptors could be of therapeutic value. Cell permeable MC4R selective ligands have been tested and were able to restore cell surface expression and signalling activity of S58C and R165W MC4R mutants. Those compounds, according to their mode of action, are described as pharmacological chaperones (PC). The MC4R-PCs also helps to rescue the glycosylation pattern (maturation) of the MC4R mutants. The site of action of MC4R-PCs of the MC4R mutants monitored by BRET suggests an action downstream of the calnexin-MC4R interaction, most likely at the level of the Golgi apparatus. Generally, a CP can have different effects according to the mutant by stabilizing distinct conformations of the receptor that are more or less able to exit the quality control system and to activate the signaling pathway, and a mutant can respond differently according to the CP used by its distinct affinity to the ligand, the CP itself and the effectors. A better understanding of PCs’ mode of action could help in the design of novel therapeutic approaches not only for early-onset morbid obesity (EOMO) but also for other conformational diseases resulting from protein misfolding.