Leadership has been claimed to be a critical determinant of success and failure in international negotiations. This thesis brings together the study of leadership in multilateral negotiations with the emerging discipline of climate change-induced human mobility. This is done by investigating the prevalence of leadership in the climate change and human mobility nexus, looking at three different actors: the Alliance of Small Island States, Bangladesh and Norway. These actors were analyzed in two different ways: first, by describing how each actor exercise leadership using an analytical framework informed by leadership theories. Second, by investigating whether these actors seem to be recognized as leaders by others, conducting and analyzing a survey from the United Nations Climate Change Conference 2018, COP24. The results indicate that all three actors can be said to exercise leadership in the area of climate change-induced migration, although they exercise leadership in slightly different ways. Out of the three actors that were analyzed, AOSIS was the only actor that seemed to be recognized by others as a leader in the effort to address climate change-induced human mobility.

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This thesis consists of two different research problems. In the first one, the aim is to model and simulate a solar-powered, single-effect, absorption refrigeration system using a flat-plate solar collector and LiBr-H2O mixture as the working fluid. The cooling capacity and the coefficient of performance of the system are analyzed by varying all independent parameters, namely: evaporator pressure, condenser pressure, mass flow rate, LiBr concentration, and inlet generator temperature. The cooling performance of the system is compared with conventional vapor-compression systems for different refrigerants (R-134a, R-32, and R-22). The cooling performance is also assessed for a typical year in Tampa, Florida. Higher COP values are obtained for a lower LiBr concentration in the solution. The effects of evaporator and condenser pressures on the cooling capacity and cooling performance are found to be negligible. The LiBr-H2O solution shows higher cooling performance compared to other mixtures under the same absorption cooling cycle conditions. For typical year in Tampa, Florida, the model shows a constant coefficient of performance of 0.94. In the second problem, a numerical model is developed for a typical food retail store refrigeration/HVAC system to study the effects of indoor space conditions on supermarket energy consumption. Refrigerated display cases are normally rated at a store environment of 24ºC (75ºF) and a relative humidity of 55%. If the store can be maintained at lower relative humidity, significant quantities of refrigeration energy, defrost energy and anti-sweat heater energy can be saved. The numerical simulation is performed for a typical day in a standard store for each month of the year using the climate data for Tampa, Florida. This results in a 24 hour variation in the store relative humidity. Using these calculated hourly values of relative humidity for a typical 24 hour day, the store relative humidity distribution is calculated for a full year. The annual average supermarket relative humidity is found to be 51.1%. It is shown that for a 5% reduction in store relative humidity that the display case refrigeration load is reduced by 9.25%, and that results in total store energy load reduction of 4.84%. The results show good agreement with available experimental data.

Climate change is a critical sustainable development issue with implications for the environment, economies and society as we know it. The problem of climate change is caused by some countries in parts of the world that has a direct effect on people and natural resources in other parts of the world. Climate change is the effect of increased production of Greenhouse gases (GHGs). Due to the vast complexity of the climate change regime the study does not attempt to be comprehensive or conclusive. The aim of the study is to critically evaluate and determine the purpose, enforceability, legal nature, shortcomings and strengths of the non-binding Copenhagen Accord and how the international climate change regime will evolve after the Copenhagen Accord. The study starts with a brief explanation of the international climate change regime and its development, including international environmental law principles, specifically the common but differentiated responsibility principle. The United Nations Framework Convention on Climate Change (UNFCCC) has the ultimate objective to achieve the stabilisation of GHG concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system. The Conference of the Parties (COPs) is the ultimate decision-making and supreme body of the UNFCCC and is authorised to make and implement decisions to promote the implementation of the UNFCCC, it further has the power to adopt new protocols under the UNFCCC and plays a substantial role in the development of new obligations by the parties to the convention. Various COPs, their respective adopted decisions and resolutions which played an important role in the development of the climate change regime are discussed. This includes COP 1 that lead to the Berlin Mandate; COP 3 and the Kyoto Protocol; COP 7 and the Marrakech Accords; COP 11 that marked the entry into force of the Kyoto Protocol; COP 13 and the Bali Action Plan. COP 15 in Copenhagen was internationally expected and intended to be the breakthrough in addressing the post 2012 period. As is evident from the content of this study the result of COP 15 at Copenhagen means different challenges for different countries and the “bottom up” architecture of the accord could help encourage and reinforce national actions. An overview of the effect of the Copenhagen Accord on the climate change regime, with specific reference to COP 16 in Cancun, is then done. The “bottom up” architecture of the Copenhagen Accord was brought into the official UNFCCC process by the Cancun Agreements that were reached at COP 16. The study mostly comprised of a literature study, which reviewed the relevant international environmental law dealing with climate change, taking into account customary international law; international treaties and conventions; government documents, policies and reports; textbooks and academic journals as well as electronic material obtained from various internet sources. / Thesis (LLM (Environmental Law and Governance))--North-West University, Potchefstroom Campus, 2012

Climate change is a critical sustainable development issue with implications for the environment, economies and society as we know it. The problem of climate change is caused by some countries in parts of the world that has a direct effect on people and natural resources in other parts of the world. Climate change is the effect of increased production of Greenhouse gases (GHGs). Due to the vast complexity of the climate change regime the study does not attempt to be comprehensive or conclusive. The aim of the study is to critically evaluate and determine the purpose, enforceability, legal nature, shortcomings and strengths of the non-binding Copenhagen Accord and how the international climate change regime will evolve after the Copenhagen Accord. The study starts with a brief explanation of the international climate change regime and its development, including international environmental law principles, specifically the common but differentiated responsibility principle. The United Nations Framework Convention on Climate Change (UNFCCC) has the ultimate objective to achieve the stabilisation of GHG concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system. The Conference of the Parties (COPs) is the ultimate decision-making and supreme body of the UNFCCC and is authorised to make and implement decisions to promote the implementation of the UNFCCC, it further has the power to adopt new protocols under the UNFCCC and plays a substantial role in the development of new obligations by the parties to the convention. Various COPs, their respective adopted decisions and resolutions which played an important role in the development of the climate change regime are discussed. This includes COP 1 that lead to the Berlin Mandate; COP 3 and the Kyoto Protocol; COP 7 and the Marrakech Accords; COP 11 that marked the entry into force of the Kyoto Protocol; COP 13 and the Bali Action Plan. COP 15 in Copenhagen was internationally expected and intended to be the breakthrough in addressing the post 2012 period. As is evident from the content of this study the result of COP 15 at Copenhagen means different challenges for different countries and the “bottom up” architecture of the accord could help encourage and reinforce national actions. An overview of the effect of the Copenhagen Accord on the climate change regime, with specific reference to COP 16 in Cancun, is then done. The “bottom up” architecture of the Copenhagen Accord was brought into the official UNFCCC process by the Cancun Agreements that were reached at COP 16. The study mostly comprised of a literature study, which reviewed the relevant international environmental law dealing with climate change, taking into account customary international law; international treaties and conventions; government documents, policies and reports; textbooks and academic journals as well as electronic material obtained from various internet sources. / Thesis (LLM (Environmental Law and Governance))--North-West University, Potchefstroom Campus, 2012

Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-07-25T23:39:27Z No. of bitstreams: 1 CARLOS EDUARDO DA SILVA ALBUQUERQUE – DISSERTAÇÃO (PPGEM) 2017.pdf: 4080439 bytes, checksum: 940fff54d861725d16972dec4bb0ee8c (MD5) / Made available in DSpace on 2018-07-25T23:39:27Z (GMT). No. of bitstreams: 1 CARLOS EDUARDO DA SILVA ALBUQUERQUE – DISSERTAÇÃO (PPGEM) 2017.pdf: 4080439 bytes, checksum: 940fff54d861725d16972dec4bb0ee8c (MD5) Previous issue date: 2017-03-17 / CNPq / Esta pesquisa apresenta uma análise energética e exergética de uma unidade de refrigeração de água gelada de grande porte, chamada chiller. O refrigerador em estudo realiza o ciclo termodinâmico de refrigeração com auxílio de um compressor mecânico, usualmente acionado por um motor elétrico, de forma a aumentar a pressão em determinada fase do ciclo termodinâmico do sistema, o que gera um alto consumo de energia elétrica. Com avanço da tecnologia, a cada dia surgem novos tipos de compressores que possuem um menor consumo de energia e melhoram o desempenho da unidade como um todo. O objetivo deste trabalho é avaliar os comportamentos energético e exergético, baseados respectivamente na primeira lei e na segunda lei da termodinâmica, de um chiller que fornece água gelada e trabalha com um compressor tipo parafuso. Este estudo foi realizado baseando-se no comportamento real de um chiller de compressão de vapor, instalado em um shopping da região de João Pessoa-PB. Através de simulação numérica, foi possível avaliar o comportamento do equipamento com a mudança de alguns dos parâmetros normais de trabalho, como pressões de condensação e evaporação, temperatura s de condensação e evaporação e fluido refrigerante. Neste estudo, são apresentados dados do desempenho do equipamento em função das pressões do evaporador e do compressor, da temperatura de evaporação, entre outros parâmetros. Os resultados das simulações, realizadas com auxilio do software EES, mostraram que o desempenho da unidade melhora ao diminuir a variação de pressão entre o condensador e o evaporador e que as eficiências energética e exergética sofrem um acréscimo com o aumento da temperatura de evaporação e uma redução com a elevação da temperatura de condensação. / This research presents energetic and exergetic analysis of a water refrigeration unit, called Chiller. The Chiller under study performs the thermodynamic cycle of the refrigeration with the assistance of a mechanical compressor, usually triggered by an electric motor, in order to increase the pressure in a certain stage on the thermodynamic cycle of the system, which generates high energy consumption. However, with the advance of the technology, every day emergs new types of compressors that have lowest energy consumption and improves the performance of the unit as a whole. The purpose of this work is to evaluate both e nergetic and exergetic behavior, of a chiller that provides cold water and works with a screw type compressor, based on the first and second laws of thermodynamics . This study was based on the actual behavior of a steam compression chiller from a mall in the city of João Pessoa-PB. Through numerical simulation, it was possible to evaluate the behavior of the equipment with the change of some of the normal parameters of work, as condensation and evaporation pressures, condensation and evaporation temperature and refrigerant fluid. In this study, the performance of the equipment data is presented as a function of the evaporator and compressor pressures, the evaporation temperature and other parameters. The results of the simulations, that were realized with support of software EES, showed that the unit performance was improved by decreasing the pressure variation between condenser and the evaporator and also has proved that the energetic and exergetic efficiences are increased by raising the evaporation temperature and a reduction happens by increasing the condensation temperature.

Hydraulic energy is one of the most important sources in the world for electricity production. Nowadays the trend is to limit the production of the electricity from fossil fuels and to protect the environment. The main idea is to use more renewable energy sources such as wind and solar energy. Unfortunately, these alternative sources are strongly dependent on current weather conditions, which causes the instability of the electrical grid. Luckily pumped storage and hydraulic power plants provide the solution. However, it requires an extension of the operating range of the hydraulic machines. For that reason, the water turbines now operate over and extended range of regimes, that can be quite far from the best efficiency point. Hence two types of unstable two-phase flows in the Francis turbine draft tube occur: part load overload. This diploma’s thesis is focused on the Francis turbine operating at the part load. During part load conditions the helical vortex rope is being developed in the draft tube, it causes pressure pulsation and it can lead to the hydro-acoustic resonance, which damages the elements of the power plant. The aim is to eliminate the pulsation by jet control of the swirling flow in the draft tube. In the diploma’s thesis, various approaches to jet control of the flow in conical diffuser are tested using the computational fluid dynamics.

This master's thesis deals with simulation of vortex structure which is created in the draft tube of Francis turbine, at part load flow conditions. The main objective is to get the most accurate results from the calculations, using the student license of Ansys Fluent 19.1. The results from the calculations are compared with the experiment under the Francis-99 project. Mainlly in terms of dynamic properties of vortex rope – aplitude and frequency of pressure pulsations. Additionaly the time-averaged velocity profiles are compared. I used the test-case provided by NTNU – Norwegian University of Science and Technology under the Francis-99 workshop series.

This master’s thesis deals with CFD simulation of spiral vortex structure in the diffuser of swirl generator. The objective of the thesis is to evaluate influence of change in diffuser opening angle on frequency and amplitude of pressure pulsation. All results are compared in charts which shows courses of frequencies and amplitudes along the diffuser. Two different turbulence models and several types of mesh were tested

The burning of biomass for cooking purposes without proper ventilation and filters poses a massive health and climate risk. Health implications from exposure to household air pollution from this type of fuel impacts women and children in many developing countries, who spend many hours a day cooking and gathering fuel. Climate implications from burning solid biomass results in increased carbon dioxide and black carbon emissions, which contribute to global climate change. This thesis aims to explore the issues associated with biomass cookstoves in terms of both health and climate, and seeks to understand how a new national clean cookstove program could be funded in India. This includes potential partnerships with United States agencies, nonprofit organizations, and other international funding sources. The topic of clean cookstoves has gained traction as a strategy to mitigate emissions and adapt to a changing climate, and with the recent passing of the United Nations Paris Agreement, funding is increasing to support programs that address climate impacts.