Дисертації з теми "Cooling approaches"
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Gupta, Vishal. "Experimental investigations into rotary ultrasonic drilling of bones - an in vitro study." Thesis, IIT Delhi, 2017. http://localhost:8080/iit/handle/2074/7249.
Повний текст джерелаBouzoukas, Asterios. "New approaches for cooling photovoltaic/thermal (PV/T) systems." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/11148/.
Повний текст джерелаMcBee, Brian K. "Computational Approaches to Improving Room Heating and Cooling for Energy Efficiency in Buildings." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28911.
Повний текст джерелаPh. D.
Tauch, Jonas [Verfasser], and Matthias [Akademischer Betreuer] Weidemüller. "New approaches for cooling molecular anions to the Kelvin range / Jonas Tauch ; Betreuer: Matthias Weidemüller." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1236345460/34.
Повний текст джерелаHerrera, Santisbon Eunice. "Production-consumption system coordination by hybrid predictive approaches : application to a solar cooling system for buildings." Thesis, CentraleSupélec, 2015. http://www.theses.fr/2015SUPL0006/document.
Повний текст джерелаTo guarantee thermal comfort in buildings is directly related to energy consumption. In tropical climates, cooling systems for buildings represent one of the largest energy consumers. Therefore, as energy consumption is a major concern around the world, it is important to improve the systems efficiency or seeking new methods of cooling production. A solar cooling installation based on the absorption cycle is an alternative to mitigate greenhouse gas emissions and electricity consumption. In contrast to conventional vapor-compression based cooling systems, the absorption cooling production involves a complex system composed of several components as collector panel, storage tank, cooling tower and absorption chiller. Besides the sizing of the components, this complex system requires control actions to be efficient as a coordination between hot water storage, cooling water production and consumption is necessary. The aim of this research is to propose a management approach for a production-consumption energy system based on Model Predictive Control (MPC). The solar absorption cooling system is seen as part of this production-consumption energy system where the hot water storage system is the producer and the chiller-building system is one of the consumers. In order to provide modularity to the control structure, the coordination between the subsystems is achieved by using a partitioning approach where local predictive controllers are developed for each of the subsystems. The consumer controllers compute a set of energy demand profiles sent to the producer controller which selects the profile that better minimize the global optimization cost. In a first part, the proposed approach is tested on a simplified linear model composed of one producer and several consumers. In a second part, a more complex case is studied. A simplified model of an absorption cooling system is evaluated using the simulation tool TRNSYS. The producer model is no longer linear, instead it is described by a nonlinear hybrid model which increases the complexity of the optimization problem. The simulations results show that the suboptimality induced by the method is low and the control strategy fulfills the objectives and constraints while giving good performances
Landi, Daniele. "Knowledge-based approaches to support the design and development of the electrochemical storage systems." Doctoral thesis, Università Politecnica delle Marche, 2014. http://hdl.handle.net/11566/242838.
Повний текст джерелаThe need to shorten the "time-to-market" is the prerogative of all companies that operate in different industry sectors, in order to carve out a profitable position in the market against competitors. The design process has focused primarily on reducing costs, reducing production times, without decreasing the quality of the product. Nowadays also the environmental aspects play a key role and is an important factor for the success of the products on the market , in fact, a growing environmental awareness is developing among consumers . From these considerations it comes to light the need to study and develop a knowledge-based approach able to assist designers during the lifetime of the product , analyzing the aspects related to performance, cost and environmental aspects. Therefore one of the most important problems is to be able to decrease the cost and time of passage between idea and market launch; therefore have available technologies, able to predict the actual behavior of the various systems, determines a considerable advantage in terms of economic and organizational links. Successful companies are those that can improve human resources and having created special conditions able to evolve and develop the knowledge and know-how. These considerations are becoming more necessary when we consider the evolution of the western economy, in which we find ourselves faced with having to produce high quantities of customized products. The challenge for Italian engineering companies is to sell quality products while continuing to develop innovative solutions quickly, and keeping costs low . To meet this challenge, companies need to invest more and more in the design process to ensure the future of the company with dedicated strategies for innovation and technology. The objectives of this work can be summarized as the definition of a new design approach , based on knowledge which can provide new tools for the analysis and assessment of the performance of products in different application scenarios. The work focuses on the analysis of next generation storage systems consisting of lithium-ion batteries used both in automotive and stationary applications . You can still apply the methodology described also working with other application cases . With regard tothe design of battery packs , the work represents a first step in the definition and design of the lithium-ion storage systems battery . In particular , within this thesis the state of the main storage systems has been analyzed , our attention is on lithium-ion technology and their main usage problems . A deep analysis was performed for the determination of the heat generated by the individual lithium batteries during their operation . The research results have been applied to small-scale production customization, both of electric vehicles, and energy storage systems for homes.
Sosa, Pieroni Jhosmar L. "Estimation of water footprints and review of water-saving/recovery approaches in coal-fired power plants' cooling systems." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367938141.
Повний текст джерелаHasan, M. Mahmudul. "Investigation of energy efficient approaches for the energy performance improvement of commercial buildings." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/61050/1/M._Hasan_Thesis.pdf.
Повний текст джерелаBlake, Tony. "A quantum approach to cavity mediated laser cooling." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/2167/.
Повний текст джерелаMcGinley, Susan. "Cooling Cows: A Metabolic Approach to Managing Heat Stress." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2007. http://hdl.handle.net/10150/622131.
Повний текст джерелаLuque, Martínez Salvador G. "A fully-integrated approach to gas turbine cooling system research." Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558543.
Повний текст джерелаMaletzke, Fabian. "Investigation Of The Influence Of Geometrical Parameters On Heat Transfer In Matrix Cooling : A Computational Fluid Dynamics Approach." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177185.
Повний текст джерелаLeung, Ming. "A novel approach to determine building occupancy for cooling energy consumption prediction." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17403/.
Повний текст джерелаJack, William Josiah. "A Six Sigma Approach to Implementing Conformal Cooling on Existing Processes in Injection Molding." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2214.
Повний текст джерелаChinraj, Venkatesh Kumar. "Sustainability evaluation of seasonal snow storage for building cooling systems : a life cycle approach." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55194.
Повний текст джерелаApplied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
Kamali, Aslan. "Developing a Decision Making Approach for District Cooling Systems Design using Multi-objective Optimization." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-208228.
Повний текст джерелаDie Energieverbrauchsraten haben in den letzten Jahrzehnten auf globaler Ebene dramatisch zugenommen. Diese Erhöhung ist zu einem großen Teil in den jüngst hohen Temperaturniveaus, vor allem in der Sommerzeit, begründet, die einen starken Anstieg der Nachfrage nach Klimaanlagen verursachen. Solche Ereignisse sind deutlich in Entwicklungsländern zu beobachten, vor allem in heißen Klimaregionen, wo Menschen vor allem konventionelle Klimaanlagensysteme benutzen. Diese Systeme verfügen meist über eine ineffiziente Leistungsfähigkeit und wirken sich somit negativ auf die Umwelt aus, was wiederum zur globalen Erwärmung beiträgt. In den letzten Jahren ist die Nachfrage nach Stadt- oder Fernkältetechnologien und -Netzwerken als Alternative zu konventionellen Systemen aufgrund ihrer höheren Effizienz und besseren ökologischen Verträglichkeit satrk gestiegen. Ein effizientes Design für Fernkühlsysteme zu erhalten, ist allerdings eine komplexe Aufgabe, die die Integration einer breite Palette von Kühltechnologien, verschiedener Konfigurationsmöglichkeiten von Netzwerk-Layouts und unterschiedlicher Energiequellen erfordert. Hierfür ist das Treffen kritischer Entscheidungen hinsichtlich einer Vielzahl von Möglichkeiten, Optionen und Technologien unabdingbar. Das Hauptziel dieser Arbeit ist es, ein Werkzeug zu entwickeln, das vorläufige Design-Konfigurationen und Betriebsmuster für Fernkälteenergiesysteme liefert, indem aureichend detaillierte Optimierungen durchgeführt werden. Zudem soll auch ein Ansatz zur Entscheidungsfindung vorgestellt werden, der Entscheidungsträger in einem frühen Planungsstadium bei der Bewertung städtischer Kühlungssysteme hinsichtlich der wirtschaftlichen Aspekte und Umweltleistung unterstützen soll. Unterschiedliche Aspekte dieser Problemstellung wurden in der Literatur von verschiedenen Forschern untersucht. Eine kurze Analyse des derzeitigen Stands der Technik ergab, dass mathematische Programmiermodelle die am weitesten verbreitete und erfolgreichste Methode für die Konfiguration und Gestaltung von Kühlsystemen für städtische Gebiete sind. Ein weiteres Ergebnis der Analyse war die Festlegung von Mehrzieloptimierungs-Modelles für die Unterstützung des Entscheidungsprozesses. Darauf basierend wurde im Rahmen der vorliegenden Arbeit ein Mehrzieloptimierungs-Modell für die Lösung des komplexen Entscheidungsfindungsprozesses bei der Gestaltung eines Kühlsystems für ein Stadtgebiet oder einen Bezirk entwickelt. Das Modell zielt darauf ab, mehrere Elemente des Kühlsystems zu optimieren, wie beispielsweise Kühlnetzwerke, Kühltechnologien sowie Kapazität und Lage der Systemtechnik. Zusätzlich werden verschiedene Energiequellen, auch solare wie Solarkonzentratoren, Vakuum-Solarkollektoren und PV-Module, berücksichtigt. Das Modell wurde auf Basis der gemischt-ganzzahlig linearen Optimierung (MILP) entwickelt und in GAMS Sprache implementiert. Zwei Fallstudien wurden mit dem entwickelten Modell untersucht. Die erste Fallstudie besteht aus sieben Gebäuden, die ein Wohnviertel darstellen, während die zweite Fallstudie einen Universitätscampus dominiert von Nichtwohngebäuden repräsentiert. Die Untersuchung wurde für mehrere Gruppen von Szenarien durchgeführt, wobei bestimmte Designparameter und Betriebsbedingungen überprüft werden, wie zum Beispiel die zur Verfügung stehende Fläche, Lage der Kühlanlage, örtliche Restriktionen der Kältespeicherung, Rohrpreise, Investitionskosten, konstante und variable Stromtarife, Strategie zur Einbindung der Solarenergie, Verfügbarkeit von Abwärme, Strategien der Lastenverschiebung, und die Wirkung der Außentemperatur in heißen Regionen auf die Leistung des Kühlsystems. Die Untersuchung bestand aus drei Stufen, wobei die jährlichen Gesamtkosten und die CO2-Emissionen die erste und zweite Einzelzieloptimierungsstufe darstellen. Die dritte Stufe war ein Pareto-Optimierung, die die beiden ersten Ziele kombiniert. Im Anschluss wurden nicht-dominante Lösungen, also Pareto-Lösungen, erzeugt, indem mehrere Pareto-Optimierungs-Szenarien basierend auf den Präferenzen der Entscheidungsträger abgebildet wurden. Schließlich wurde ein Ansatz zur Entscheidungsfindung entwickelt, um Entscheidungsträger bei der Auswahl einer bestimmten Lösung zu unterstützen, die am besten den Präferenzen des Planers oder des Entscheidungsträgers enstpricht, basierend auf der Differenz der Utopia und Nadir Werte, d.h. der jährlichen Gesamtkosten und CO2-Emissionen, die Ergebnis der einzelnen Optimierungsstufen sind
Wilde, Daniel G. "Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1384.
Повний текст джерелаMoodley, Anand. "Development of a unified mass and heat integration framework for sustainable design an automated approach /." Diss., Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-04222008-094925/.
Повний текст джерелаLind, Malin, and Karl Johan Josefsson. "A CFD Method for Simulation of Gas-Liquid Flow in Cooling Systems : An Eulerian-Eulerian Approach." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129372.
Повний текст джерелаTan, Zhi Bin. "Post-Welding Cooling Rate in TCW Joints: An Experimental and Numerical Approach to Understand its Effects." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21889.
Повний текст джерелаRemella, Siva Rama Karthik. "Steady State Mathematical Modeling of Non-Conventional Loop Heat Pipes: A Parametric and a Design Approach." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353154991.
Повний текст джерелаWebbeer-Youngman, Ronald Clifford William. "An integrated approach towards the optimization of ventilation, air cooling and pumping requirements for hot mines / R.C.W. Webber-Youngman." Thesis, North-West University, 2005. http://hdl.handle.net/10394/467.
Повний текст джерелаThesis (Ph.D. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2005.
Tan, Meng Hor Freddie. "Theoretical and experimental investigations of porous cooling and adaptive thermal comfort approach for tropical and hot-and-humid climates." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326652.
Повний текст джерелаPesic, Nikola. "Geo-climatic potential for advanced natural ventilation comfort cooling approach in mid-rise office buildings in the north-western Mediterranean." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/670793.
Повний текст джерелаEl objetivo de esta investigación es evaluar el potencial geo-climático para el ahorro de energía de enfriamiento de confort en los edificios de oficinas de mediana altura aplicando el concepto de ventilación natural avanzada (ANV). El enfoque es en la costa Mediterránea de Cataluña y las ubicaciones geográficas seleccionadas: Barcelona, Terrassa y Tarragona. La primera parte de investigación evalúa el potencial climático de ventilación natural (CPNV), un nivel teórico de disponibilidad de ventilación natural (NV) aplicando el modelo de confort térmico adaptativo. Para una comparación de los potenciales geo-climáticos en un contexto regional más amplio, están elegidas las ubicaciones a lo largo del Mediterráneo Norte: Valencia, Marsella, Roma, Koper, Split, Atenas y Nicosia. Los resultados confirman que NV es factible principalmente desde abril hasta octubre, mientras que en julio y agosto es considerablemente limitada. La segunda parte del trabajo examina los ahorros de energía de enfriamiento de un hipotético modelo “A” del edificio de oficinas de media altura. Las simulaciones de rendimiento de edificios (BPS) en la región de Cataluña demuestran una reducción anual de cargas de enfriamiento entre 22% y 51%. El mismo modelo posicionado a lo largo del Mediterráneo Norte muestra la reducción de las cargas anuales en un rango más amplio, entre 6% y 51%. La siguiente sección evalúa los niveles de vulnerabilidad al cambio climático aplicando escenarios climáticos para los años 2050 y 2080. Se indica que el potencial de ANV se reducirá cerca de cero en julio y agosto de 2080. Sin embargo, la introducción de unas técnicas de enfriamiento asistidas demuestra que ese impacto puede ser absorbido aproximadamente a la escala previamente evaluada en el horizonte de 2050. La última parte de investigación exhibe que el modelo “B” tiene un mejor nivel de la eficiencia energética del enfriamiento de confort: se fusionan técnicas de NV seleccionadas para aprovechar las temperaturas exteriores nocturnas más bajas por medios pasivos, cuyo potencial se refleja sobre la disminución de las cargas de enfriamiento activo diurno. Para este propósito, el modelo posicionado en Barcelona consigue la reducción anual de las cargas de enfriamiento en un 65% en las condiciones meteorológicas actuales. En conclusión, bajo las configuraciones climáticas proyectadas para 2050 y 2080, en Barcelona, Terrassa y Tarragona, la serie de BPS muestra un mayor nivel de resiliencia climática con la reducción de las cargas de enfriamiento entre 53% y 59%. El aporte clave de la investigación se encuentra en BPS experimentales del modelo “A” donde se detectan las debilidades del sistema ANV como consecuencia del cambio climático estimado. En relación con los rendimientos de enfriamiento limitados, ANV se cambia de un concepto autónomo a ser parte de un sistema de ventilación más complejo con los ciclos específicos diurnos y nocturnos. Este nuevo enfoque de diseño establecido basado en el almacenamiento dinámico de calor se asocia con una introducción del aire exterior con temperaturas más bajas durante la noche y las primeras horas de la mañana, como menos afectado por el futuro cambio climático regional. Un impulso ventajoso logrado en el desempeño energético se categoriza a través de las fortalezas y oportunidades. Por lo tanto, el modelo "B" representa la forma del edificio receptivo al clima con un sistema de enfriamiento de confort integrado sensible, lo que ofrece un mayor nivel de eficiencia energética, visto también como un factor adquirido de resiliencia frente a las amenazas estimadas del cambio climático. Tal prototipo de edificio hipotético puede resultar como un contribuyente beneficioso en el proceso actual de despliegue rápido de fuentes de energía renovables en el sector de la construcción regional, observado también desde la perspectiva de la transición energética en curso de la Unión Europea
Kamali, Aslan [Verfasser], Clemens [Akademischer Betreuer] Felsmann, and Nazar [Gutachter] Antwan. "Developing a Decision Making Approach for District Cooling Systems Design using Multi-objective Optimization / Aslan Kamali ; Gutachter: Nazar Antwan ; Betreuer: Clemens Felsmann." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://d-nb.info/1114067911/34.
Повний текст джерелаLahti, Erik Anders. "An Experimental Approach to Assessing Material Corrosion Rates in a Reactor Containment Sump Following a Loss of Coolant Accident." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373990419.
Повний текст джерелаWang, Shan. "Further study of the “GreenRoom” concept – an approach to sustainable datacenter cooling solution : Identification of improvement possibilities using Life Cycle Assessment (LCA) and discussion about the effect of the choice of Life Cycle Impact Assessment (LCIA) methods on the results." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116474.
Повний текст джерелаThe Teliasonera Green Room Concept for high and mid density of ICT equipment
Bailey, John Denver. "AN APPROACH TO THE MEASUREMENT OF SEXUAL BEHAVIOR IN THE BULL (BOS TAURUS) USING VARIABLE FEMALE STIMULUS CONDITIONS." Lexington, Ky. : [University of Kentucky Libraries], 2003. http://lib.uky.edu/ETD/ukyansc2003d00105/JDBDiss.pdf.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains ix, 194 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 180-191).
Zeaiter, Amal. "Thermal Modeling and Cooling of Electric Motors : Application to the Propulsion of Hybrid Aircraft Thermal Sensitivity Analysis of a High Power Density Electric Motor for Aeronautical Application Numerical Approach to Determining Windings’ Thermal Conductivity Electro-thermal Models and Design Approach for High Specific Power Electric Motor for Hybrid Aircraft Determination of electric motor losses and critical temperatures through an inverse approach." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0015.
Повний текст джерелаThe concern of this thesis is the thermal modeling of high-specific power electric motors. The aim is to allow finding the efficient and adequate cooling solutions of the motors designed for hybrid aircraft propulsion application. Two specific power values, 5 kW/kg for the short-term (year 2025) and 10 kW/kg for the long-term (year 2035), are targeted, each with specific requirements. The investigated type of electric motors is the synchronous machine with surface-mounted permanent magnets. This motor type is constrained by relatively low values of maximum allowed temperatures in windings and magnets. Once reached, these temperature values lead to a failure in motor operation or at least to shortening its lifetime. Moreover, with a closed motor design and high heat fluxes generated, the optimization of the cooling is essential.To become acquainted with the issue, a detailed state of the art on electric machine cooling is elaborated. Then, the commonly used techniques and the recent technological advancements are analyzed with respect to our case study. Afterward, in order to predict motor thermal behavior and ensure the monitoring of critical temperatures (windings and magnets), a nodal transient model is implemented and solved on Matlab software. This latter is built for the whole system of the motor and cooling circuit. Specific conditions of the flight are taken into account, particularly the outside air temperature variation in terms of altitude and the flight mission profile. Actually, the motor losses, generating the heat in the machine, vary depending on the motor power during the mission. For the identification of crucial parameters, a Finite-Element study was conducted and corresponding correlations were elaborated to estimate the windings thermal conductivity through polynomial interpolation.Several studies were carried out involving the influence of the thermo-physical properties, the outside temperature, the coolant nature, its flow rate as well as the exchanger surface, on the temperature response of the model. This model has allowed studying several motor designs and proposing adequate cooling solutions. For each target, a final optimal configuration of the motor with its cooling system was adopted.Besides, since the electromagnetic and mechanical losses are hardly estimated in this machine type, a chapter was dedicated to identifying them through an inverse approach. A sequential technique, that uses Beck’s function specification for regularization, was developed. Three cases of unknown losses, with increasing complexity, were studied, proving the method's reliability. Finally, using the same developed low-order model, the real-time procedure also allows monitoring low-accessibility motor temperatures (specifically hot spots)
McGilligan, Charles. "Securing a pathway which leads to an 80% reduction in greenhouse gas emissions : effects of climate change on levels of space heating and space cooling, and analysis of the energy saving potential of the adaptive approach to thermal comfort in the built environment." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577755.
Повний текст джерелаWang, I.-Ting, and 王苡婷. "Approaches on the Construction and Performance of Radiant Cooling System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47280579247355784047.
Повний текст джерела國立臺灣科技大學
建築系
97
Taiwan, which is in a hot and humid climate zone, has been impacted by global warming. The average temperature slightly increases year over year, and the summer season is getting longer and longer. The interior room must be removed both sensible heat and latent heat by the mechanical control or other active control. The main task how to keep a healthy environment, a comfortable indoor environment, and maintain energy efficiency is an important approach in this study. This study is to build a new radiant cooling system with an all-air system in a testing chamber of the following dimensions, of 10m(L)×7.6m(W)×3.85m(H). This article is also meant to introduce and test the functional performance of each device (equipment) with the radiant cooling system. The radiant cooling system is divided into four parts: the chilling system, the air system, the power system, and the monitoring system. Now to describe the component equipment and functions of each system; for the test part of the system, record the indoor climate of the test chamber, temperature of chiller, temperature of radiant cooling ceiling, and inlet temperature of the air system. All measurement data were recorded and monitored by a remote computer. In addition, tests of the radiant cooling system were compared against an all-air system. There are some results which are abstracted below this paragraph: Indoor temperature was effected by the supply of air temperature, the inlet water temperature of radiant cooling ceiling, the opening percentage of the outdoor air damper, heater on/off, the opening percentage of the control valve, occupied / unoccupied. Indoor humidity was effected by supply air temperature, the opening percentage of the outdoor air damper, heater on/off, the opening percentage of the control valve, occupied / unoccupied. The inlet or outlet water temperature of chiller was effected by the opening percentage of the outdoor air damper and the opening percentage of the control valve occupied / unoccupied. The inlet or outlet water temperature of radiant cooling ceiling was effected by outlet water temperature of chiller, the opening percentage of the control valve and occupied / unoccupied. The dew point was effected by supply air temperature, the opening percentage of the outdoor air damper, heater on/off, the opening percentage of the control valve and occupied / unoccupied. By using different air-conditioning systems, the radiant cooling ceiling system kept indoor temperature balance which last at least for 30 minutes, whereas an all-air system just needed 20 minutes. The radiant cooling ceiling system has high performance of dehumidified but all-air system could dehumidify in a short time. For energy efficiency, the radiant cooling ceiling system was more efficient than all-air system by a rate of 3.27.
Chen, Chia-jui, and 陳家瑞. "Approaches on the Construction and Performance of Cooling System Integrated with Ground Source Heat Pump." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/04895638196613373999.
Повний текст джерела國立臺灣科技大學
建築系
101
Taipei City is located in the subtropical monsoon climate zone. The average summer temperature increases annually and the duration of summer lengthens because of humid air throughout the year, the greenhouse effect, and the urban heat island phenomena. Consequently, the energy required for air-conditioning continues to rise. In addition to optimizing the performance of air-conditioners and reducing power consumption, alternative energy should be searched or integrated with enthusiasm. In recent years, most attention is devoted to the utilization of shallow ground sources, which are one of the energy-saving techniques based on thermal environment control. As the conditions of earth energy and environments continue to deteriorate, ground source heat pump air-conditioning systems demonstrate high efficiency, zero pollution, and great research potential. This study investigated the construction of the ground source cooling air-conditioning experiment facility. In addition, the performance of the ground source heat pump air-conditioning equipment was preliminarily verified. The results of system construction and underground environment monitoring can serve as future reference for system type setup and thermal exchanger installation. The experiment results of the ground source heat pump provide information regarding system energy consumption and underground dissipation efficiency, which can be used to identify the application potential in regions of similar geological properties. The most drastic changes of underground temperatures were measured five meters below the earth surface, with an average change of 8℃. The average temperature change measured at six to ten meters underground was approximately 1.5℃. The temperature measured 11 meters underground was almost constant. The average temperature was slightly lower than 24℃, with a variation less than 0.2℃. In addition, the performance experiment of the ground source heat pump controlled the expected indoor temperature to change the thermal load of the air-conditioner. When the indoor equilibrium temperature was 30℃, the input of thermal load increased the underground temperature by 1.3℃. The increased temperature was fully dissipated after 20 hours, restoring to the initial underground temperature. Under these experiment conditions, the startup/shutdown ratio was 4:20 (4-hr startup:20-hr shutdown), which fulfilled the expectation that the system could be utilized on a daily basis.
"Improving Urban Cooling in the Semi-arid Phoenix Metropolis: Land System Science, Landscape Ecology and Urban Climatology Approaches." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50440.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Geography 2018
Lo, Tzu-Yi, and 羅子益. "Effect of Coolant Passage Configuration on the Film Cooling Performance of Aero-Optic Infra-Real Window with CFD Approach." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/55205518479555994614.
Повний текст джерела國防大學理工學院
機械工程碩士班
97
The aim of this thesis is to investigate the thermal protection performance of cooled slot flow over an IR optical window equipped in the head of a hypersonic flight missile with CFD method. The seeker in the IR window is used to track the target then to guide the missile to the modified trajectory in high flight speed. As the anti-missile vehicle flight in the high attitude atmosphere layer, most of the kinetic energy will be transformed into the thermal energy over the surfaces of missile body due to the thin shock layer characteristics. Therefore, the flow field nearby the IR window is influenced by the interaction of shock wave and developing boundary layer flow. The variations in density, pressure and species concentration result in high temperature gradient over the IR window. Not only the structure strength of IR window but also the aero-optic performance in such a severe environment must be considered in the design stage. To reduce the heat load on the IR window, the external film cooling method from a slot with various mass flow rates is used in present work. The numerical code is validated with similar cases in literatures before conducting runs. Three different types of cooled flow passage configuration were tested when the flight Mach number is 6. Results indicate that the optimum configuration is the forward inclined angle of 225 degree cavity model over tested ranges of mass flow rate of coolant. Comparison of .area-averaged film cooling performance among tested cases shows that the mass flow rate of 0.125 kg/s is suitable for cooling down the surface temperature of IR window below 500K. There is a minor influence of attack angle on the film cooling performance of slot flow over present IR window.
(11191899), Jie Ma. "A SEQUENTIAL APPROACH FOR ACHIEVING SEPARATE SENSIBLE AND LATENT COOLING." Thesis, 2021.
Знайти повний текст джерелаCurrent air conditioning systems generally operate with a relatively fixed moisture removal capacity, and indoor humidity conditions are usually not actively controlled in most buildings. If we focus only on sensible heat removal, an air conditioning system could operate with a fairly high evaporating temperature, and consequently a high coefficient of performance (COP). However, to provide an acceptable level of dehumidification, air conditioners typically operate with a much lower evaporating temperature (and lower COP) to ensure that the air is cooled below its dew point to achieve dehumidification. The latent (moisture related) loads in a space typically only represent around 20-30% of the total load in many environments; however, the air conditioning system operates 100% of the time at a low COP to address this small fraction of the load. To address issues associated with inadequate dehumidification and high energy consumption of conventional air conditioning systems, the use of a separate sensible and latent cooling (SSLC) system can dramatically increase system COP and provide active humidity control. Most current SSLC approaches that are reported in the literature require the installation of multiple components or systems in addition to a conventional air conditioner to separately address the sensible and latent loads. This approach increases the overall system installation and maintenance costs and complicates the controller design.
A sequential SSLC system is proposed and described in this work takes full advantage of readily available variable speed technology and utilizes independent speed control of both the compressor and evaporator fan, so that a single direct expansion (DX) air-conditioning (A/C) system can be operated in such a way to separately address the sensible and latent loads in a highly efficient manner. In this work, a numerical model of DX A/C system is developed and validated through experiential testing to predict the performance under varied equipment speeds and then used to investigate the energy saving potential with the implementation of the proposed sequential SSLC system. To realize the sequential SSLC system approach, various corresponding control strategies are proposed and explained in this work that minimizes energy consumption while provides active control over both space temperature and relative humidity. At the end of this document, the benefits of applying the SSLC system in a prototype residential building under different typical climate characteristics are demonstrated.
Franco, André Filipe Romão. "Numerical Modeling of Cooling Water Droplets using a Two-Way Coupling Approach." Master's thesis, 2019. http://hdl.handle.net/10400.6/8567.
Повний текст джерелаA presente dissertação centra-se no estudo do processo de arrefecimento e congelamento de gotas de água em queda livre. O fenómeno de congelamento é de extrema relevância na área de Engenharia Aeronáutica, uma vez que devido ao impacto de gotas nas superfícies sustentadoras de uma aeronave e consequente acumulação de gelo poderão ocorrer incidentes e acidentes com as aeronaves. Como forma de impedir a formação e acumulação de gelo, existem diversos sistemas para combater este perigo. As áreas críticas de uma aeronave estão normalmente protegidas por sistemas anti gelo. No entanto, embora estes métodos consigam evaporar gotas de água ou derreter o gelo acumulado, existe ainda a possibilidade de formação de gelo a jusante devido a um novo congelamento da mistura gelo-água em áreas desprotegidas. Desta forma, surge uma necessidade de estudar e adaptar os modelos físicos e matemáticos existentes para uma melhor aproximação a situações reais, por forma a contribuir para uma melhor compreensão deste fenómeno e consequentemente levar a uma redução do número de incidentes e acidentes, melhorando as condições de segurança. O objetivo deste trabalho passa pela realização de um estudo numérico com o intuito de estudar o arrefecimento de gotas de água em queda livre para diferentes diâmetros e razões de humidade do ar. As correlações de Ranz-Marshall são utilizadas, com e sem a adição de um fator de correção, para além da abordagem de Abramzon e Sirignano, como forma de considerar os efeitos de convecção. O modelo utilizado é de Two-Way Coupling e as previsões são comparadas com dados experimentais e previsões numéricas cuja abordagem foi One-Way Coupling.
Chen, Hsiang-Lun, and 陳相輪. "A simulation-optimization approach of free cooling for data centers in worldwide zones." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/b45sdf.
Повний текст джерела國立臺北科技大學
機電科技研究所
101
Based on the climate classification of ASHRAE 90.1 and the required operating environment conditions for data centers suggested by the ASHRAE Technical Committee TC 9.9, we used a dynamic building energy simulation program (Energy Plus) to examine the energy efficiency of the air-side differential enthalpy control free cooling technology and water-side free cooling technology used in data centers in 17 climate zones. The results showed that the optimum air-side free cooling efficiency was achieved in data centers located in mixed-humid, warm-marine, and mixed-marine climate zones. Because significant humidification is required to adjust outdoor air in climate zones with a lower dew point temperature, such as very-cold, subarctic, cool-dry, and cold-dry climate zones, the power consumed is even higher. The energy saving in climate zones with a lower dew point temperature will be negative to positive when control outdoor air introduced with outside air dew point. The energy saving of HVAC in most climate zones is between 30% and 40 %( or above) when adopt the heat recovery chiller system to be heating source of the humidification system and none-control outdoor air introduced with outside air dew point. The optimum setting water temperature to start the water-side free cooling system is between 17℃ and 19℃ (according to climate zone) under the operating conditions of the air-conditioning system studied in this paper and does not cause humidification problems in condition zone. The results of this study indicate that the energy saving adopt air-side differential enthalpy control free cooling technology is higher than adopt water-side free cooling technology in climate zone 1B to 5A, 5C and 6A. However, it is suitable to use the water-side free cooling technology in climate zone 5B, 6B to 8. The energy saving will achieve the optimal in all climate zones when adopt air-side differential enthalpy control free cooling technology with heat recovery chiller system.
Wu, Sung-Lin, and 吳松霖. "An Approach for Energy Efficiency Enhancement on The Cooling System of A Rack-Mounted Server." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/fmhn95.
Повний текст джерела大同大學
通訊工程研究所
102
As people gradually increased dependence on networks, servers and computer room have more demand. Reducing the power consumption of IT equipment is an important goal of each data center. Therefore, this paper proposes a better method to enhance the rack server by redesigned fan system which include the relationship of the CPU usage and current, the relationship of the CPU usage and server temperature, and fan speed impact on the temperature. Use measuring instruments to read the server temperatures of certain areas inside the server. After collecting temperatures as parameters, I coordinate the new deduced method of fan control on this paper to identify and keep similar temperature as original, also can reduce the power consumption to make the cooling system energy efficiency better. Besides, experiments found that the original fan control system will increase the fan speed during higher loading. But increase the fan speed can’t reduce the CPU temperature and the server temperature efficiently. Resulting the lower efficiency of power consumption when fan system is in higher loading. So this experiment improving energy efficiency by changing the fan speed to cooling the heat source. Experimental results confirmed that this method can reduce 17.35% of power consumption of the fan system while maintaining a similar average temperature.
MAZZEI, LORENZO. "A 3D coupled approach for the thermal design of aero-engine combustor liners." Doctoral thesis, 2015. http://hdl.handle.net/2158/993808.
Повний текст джерелаRadchenko, M., E. Trushliakov, A. Radchenko, S. Kantor, V. Tkachenko, М. Радченко, Є. Трушляков, А. Радченко, С. Кантор, and В. Ткаченко. "Approach to enhance the energetic efficiency of air conditioning systems by cooling load distribution in ambient air procession." Thesis, 2020. http://eir.nuos.edu.ua/xmlui/handle/123456789/4346.
Повний текст джерелаУ загальному випадку весь діапазон холодопродуктивності будь-якої системи кондиціювання повітря включає нестабільний діапазон і порівняно стабільну частину холодопродуктивності для подальшого охолодження повітря. Таким чином, стабільний діапазон холодопродуктивності може бути забезпечений роботою звичайного компресора, в той час як режим із значними коливаннями холодопродуктивності вимагає її модуляції. Пропонований підхід може бути використаний для проектування систем зі змінним потоком хладагента (VRF), забезпечених системою обробки зовнішнього повітря (OAP).
Abstract. In general case, an overall cooling load band of any air conditioning system comprises the unstable cooling load range and a comparatively stable cooling load part for further air cooling. Thus, the stable cooling load range can be covered by operation of conventional compressor, meantime mode with considerable cooling load fluctuation needs load modulation. A proposed method can be adopted for designing Variable Refrigerant Flow (VRF) systems provided with Outdoor Air Processing (OAP) system.
Bertini, Davide. "High-fidelity prediction of metal temperature in gas turbine combustors using a loosely coupled multiphysics approach." Doctoral thesis, 2019. http://hdl.handle.net/2158/1155985.
Повний текст джерела"Cooling Strategy for Effective Automotive Power Trains: 3D Thermal Modeling and Multi-Faceted Approach for Integrating Thermoelectric Modules into Proton Exchange Membrane Fuel Cell Stack." Master's thesis, 2014. http://hdl.handle.net/2286/R.I.26885.
Повний текст джерелаDissertation/Thesis
Masters Thesis Technology 2014
RINALDI, Alessandro. "Building Energy Management Systems (BEMS) optimization, by modeling occupants' behavior towards an agent-based approach." Doctoral thesis, 2017. http://hdl.handle.net/11589/100386.
Повний текст джерелаDel, Fabbro Giada Alessia. "A review of South African perspectives on serial murder." Diss., 2006. http://hdl.handle.net/2263/29232.
Повний текст джерелаDissertation (MA (Clinical Psychology))--University of Pretoria, 2007.
Psychology
MA
unrestricted