A dissertation submitted to the Faculty of Engineering and the Built Environment at the University of the Witwatersrand, in fulfilment of the requirements of a Master of Science in Building. / Introduction: Literature shows that an organization that participates in learning broadens its competitive advantage, capabilities and efficiency ensuring overall improved performance. This study reviews organizational learning in small and medium Energy Service Companies (ESCos) undertaking energy efficiency projects in the South African building industry. In addition, the study examines what impact the organizational learning has on the performance of ESCos. Furthermore factors and practices that influence organizational learning in small and medium sized ESCos are identified and reviewed. Aim: The study develops a framework for the effective learning practices which lead to better performance in implementing energy effiency projects. Design/methodology/approach: The study uses a combination of interviews, document and literature review. Interviews and literature were used to gather information on organizational learning and learning practices in small and medium ESCos undertaking energy efficiency building projects. Company documents, government policies and Eskom’s operational documents were documents used for analysis. All the findings were triangulated to ensure validity and reliability. Outcome: ESCOs are instrumental in promoting energy efficiency. This study identified current learning practices and the factors that promote learning within ESCos. This enables ESCos to strategize on the possible improvement on their performances. Keywords: Buildings, Energy Efficiency, Energy Service Companies (ESCos), Organizational Learning, Performance, Small and Medium Enterprises (SMEs), and South Africa 1 Eskom is a utility company in South Africa that generates, transmits and distributes electricity to various sectors within the country and other SADC region.

One of the greatest challenges that will face humanity in the 21st century is the issue of climate change brought about by emissions of greenhouse gases. Energy use is one of the primary sources of greenhouse gas emissions. However, it is also one of the most important contributors to improved human welfare over the past two centuries and will continue to be so for years to come. This quandary has led a number of researchers to suggest that geoengineering may be required in order to allow for continued use of fossil fuels while at the same time mitigating the effects of the associated greenhouse gas emissions on the global climate. The goal of this research was to develop a model that would allow decision-makers and policy analysts to assess the optimal mix of energy and geoengineering resources needed to meet global or regional energy demand at the lowest cost while accounting for appropriate emissions, greenhouse gas concentration, or temperature rise constraints. The resulting software model is called the Combined Energy and Geoengineering Optimization Model (CEAGOM). CEAGOM was then used to analyze the recently announced U.S.-China emissions agreement and to assess what the optimal global energy resource mix might be over the course of the 21st century, including the associated potential need for geoengineering. These analyses yielded optimal mixes of energy and geoengineering resources that could be used to inform regional and global energy and climate management strategies.

Background: Three billion individuals worldwide rely on biomass fuel (crops, dung, wood) for cooking and heating, mostly in the developing world. Incomplete combustion of these biomass fuels in inefficient cookstoves leads to high levels of household air pollution (HAP). Health conditions resulting from HAP are responsible for approximately 1.6 million premature deaths each year. Of the diseases associated with HAP exposure, lower respiratory infections (LRIs) are the leading cause of death for children under five worldwide. There is a great need to understand the etiology of HAP-associated LRIs to inform health interventions and to improve treatments. Ultimately, however, the only way to prevent the disease burden from HAP is to stop exposure. Policies and programs to promote the use of clean fuels for cooking are a pivotal prevention strategy. Methods: All three studies draw from an established cohort in Ghana. The Ghana Randomized Air Pollution and Health Study (GRAPHS), was a cookstove intervention trial in Kintampo, Ghana. Participants were randomized to a more efficient biomass cookstove arm, a liquefied petroleum gas (LPG) stove arm, or the traditional cookstove arm (baseline). The principal outcome of GRAPHS was childhood pneumonia. The first chapter utilizes banked nasal swabs from GRAPHS to assess the relationship between HAP exposures and a panel of known respiratory pathogens. In the second chapter we leverage data on stove use during GRAPHS, and then follow a sub cohort 6 months prior to and 6 months after the GRAPHS termination date. We employ a novel construct, suspended use, to understand the factors associated with people stopping LPG use. The third chapter tests a new randomized intervention on a subset of the GRAPHS participants. We provide free cookstoves, and allocate participants to one of four arms: a behavior change intervention, an intervention where LPG fuel is directly delivered to their home, a dual intervention of behavior change and fuel delivery, or a control arm. We track their stove use to identify the most effective intervention on sustained use. Results: In Chapter 1, we find that the traditional cookstove users had a higher mean number of microbial species than the LPG (LPG: 2.71, 3-stone: 3.34, p<0.0001, n = 260). This difference was driven by increased bacterial (p<0.0001) rather than viral species presence (non-significant). Adjusted exposure-response analyses, however, produced null results. Chapter 2 identifies several factors associated with reduced or suspended LPG use of intervention cookstoves, including: experience of burns, types of food made, and access to biomass fuels. Finally, in Chapter 3 results show increased use for all three intervention arms, the largest for the direct delivery arm with an increased weekly use of 4.7 minutes per week (p<0.001). Conclusions: Transition away from traditional biomass stoves is projected to curb the health effects of HAP by mitigating exposure, but the full benefits of newer clean cookstove technologies can only be realized if use of these new stoves is absolute and sustained. This work enhances our understanding of the etiology of HAP-associated pneumonia, the drivers of clean cookstove suspension, and informs policies designed to promote clean cookstove sustained use, thus reducing the burden of disease associated with exposure. We recommend future use of the suspended use paradigm in research to inform future household energy interventions. Additionally, we encourage policymakers to incorporate health behavior change theory and approaches in cookstove intervention and promotion efforts.

This work examines issues that are restricting the wider adaptation of sustainable (‘renewable’) energy systems in Australia and elsewhere. Several new innovative areas of opportunity for improving the application of wind and solar PV based systems have been explored and developed. A number of financial and regulatory obstructions to wind and solar systems and grid connection are examined and a number of regulatory changes to the regulatory electricity codes are suggested. / Doctor of Philosophy (PhD)

<p>The present study is focused on the female parliamentary members as agents: those who forced their way through the power structures, those who were elected to political commissions of trust, and those who managed to pursue political issues in the maledominated environment. The overall aim of the study has been to investigate the roots of the female parliamentary members’ political actions and their ability to act strategically and purposfully in order to obtain power in the Swedish bicameral Riksdag. By depicting a collective biography of the female parliamentary members I have investigated how the individual female politicians advanced in their careers and explained the changes over time.</p><p>Four problem areas were investigated. The gender structure in the Riksdag was studied through mapping of the female parliamentary members’ backgrounds and career routes. The women’s political interests and work in the Riksdag were studied. In addition I investigated whether there was any cooperation among the female parliamentary members and whether on some occasions they cooperated in order to promote common female interests and also whether there were women in the Riksdag who worked and cooperated in order to level out the gender differences in society. Finally the female parliamentary members’ views of the parliamentary and party work were studied.</p><p>When the Riksdag was first opened to female members the structures isolated them. The men did not admit them into the work of the Riksdag on the same conditions. The women were restricted by the gender order of the Riksdag, but some agents could still modify the structural conditions. Some of the female agents broke their isolation by acting collectively. Their work on the female issues gave them legitimacy in time. They acquired channels in order to work for their interests. They widened their areas of interest and in time they managed to take part in the work of the committees and parliamentary groups. They were then rewarded with assignments. The male parliamentary members admitted the female parliamentary members into politics. They also started co-operating with the men to an increasingly high degree. At the end of the period of investigation the female parliamentary members became more and more integrated in the work of the Riksdag. The great usefulness of the female parliamentary members’ work did not manifest itself however until the 1970s, when they were very successful in their political endeavours and the female representation increased considerably.</p>

This thesis examines the connection between technological dependence of mankind and its attitudes towards it. The issue is to what extent technological change in the workplace is a generator of conflict or a creator of consensus? The subject of the study is the Swedish mining company LKAB during the period 1946-1987. The case study concentrates on the approaches to new technology by the local union leadership and the LKAB company management. The analysis is carried out through a classification scheme over job- functions, divided into four functional categories. The classification is ranging from manually inclined work on the end to highly automized work on the other pole. The results show a clear and unquestionable development of mechanization. At the next level of analysis the focus is on approaches and ways of relating mechanization by the two parties took on the question, and how this influenced the relationships between the two parties. The final results show that technological change in general is a creator of consensus. However, at the same time, techno­logical change is an unequeal process because the company commands control over three kinds of power resources; ownership, the legislative right of paragraph 32 and the monopoly of technological expertis. Organized labour can only try to attain technological knowledge and high levels of worker support. / digitalisering@umu

The present study is focused on the female parliamentary members as agents: those who forced their way through the power structures, those who were elected to political commissions of trust, and those who managed to pursue political issues in the maledominated environment. The overall aim of the study has been to investigate the roots of the female parliamentary members’ political actions and their ability to act strategically and purposfully in order to obtain power in the Swedish bicameral Riksdag. By depicting a collective biography of the female parliamentary members I have investigated how the individual female politicians advanced in their careers and explained the changes over time. Four problem areas were investigated. The gender structure in the Riksdag was studied through mapping of the female parliamentary members’ backgrounds and career routes. The women’s political interests and work in the Riksdag were studied. In addition I investigated whether there was any cooperation among the female parliamentary members and whether on some occasions they cooperated in order to promote common female interests and also whether there were women in the Riksdag who worked and cooperated in order to level out the gender differences in society. Finally the female parliamentary members’ views of the parliamentary and party work were studied. When the Riksdag was first opened to female members the structures isolated them. The men did not admit them into the work of the Riksdag on the same conditions. The women were restricted by the gender order of the Riksdag, but some agents could still modify the structural conditions. Some of the female agents broke their isolation by acting collectively. Their work on the female issues gave them legitimacy in time. They acquired channels in order to work for their interests. They widened their areas of interest and in time they managed to take part in the work of the committees and parliamentary groups. They were then rewarded with assignments. The male parliamentary members admitted the female parliamentary members into politics. They also started co-operating with the men to an increasingly high degree. At the end of the period of investigation the female parliamentary members became more and more integrated in the work of the Riksdag. The great usefulness of the female parliamentary members’ work did not manifest itself however until the 1970s, when they were very successful in their political endeavours and the female representation increased considerably.

This thesis studies the optimization of a variable speed, three blade, horizontal-axis wind turbine. The design parameters considered are the rotor diameter, hub height and generator capacity. The levelized cost of energy and simple payback are the figures of merit being minimized. Blade element momentum theory is used to calculate the power produced by the wind turbine rotor. Increasing the rotor diameter increases the power delivered to the generator at all wind speeds up to the limit of generator capacity. Increasing the generator capacity raises the limit on maximum power output. Increasing the hub height of a wind turbine increases power output due to the higher wind speeds at increased heights. However, all of these design changes involve an increase in capital cost. Furthermore, wind characteristics vary between wind resources. Therefore, the optimal wind turbine design will change depending on the wind resource. The model developed in this thesis is used to minimize the levelized cost of energy for various wind resources. The results of this study provide a guideline for the optimum wind turbine design in various wind resources. The model is also used to compare the difference between minimizing the levelized cost of energy and minimizing simple payback of a wind turbine located off the coast of Georgia. Simple payback is calculated by considering not only the total annual electricity produced and capital cost of the turbine but also the revenue the turbine will generate. Revenue is calculated from a time-dependent valuation of electrical power. The results of this study show that minimizing levelized cost of energy and minimizing simple payback result in the same optimum design for this particular site. The results show, however, that using a time-dependent valuation of electricity results in a different simple payback than when an average value of electricity is used.

The increasing demand for energy and the increased depletion rate of nonrenewable energy resources call for research on renewable alternatives. Mapping the availability of these resources is an important step for development of energy conversion projects. For this purpose, the wave power potential along the Atlantic coast of the southeastern USA, and the tidal stream power along the coast of Georgia are investigated in this study. Wave power potential is studied in an area bounded by latitudes 27 N and 38 N and longitudes 82 W and 72 W (i.e. North Carolina, South Carolina, Georgia, and northern Florida). The available data from National Data Buoy Center wave stations in the given area are examined. Power calculated from hourly significant wave heights and average wave periods is compared to power calculated using spectral wave energy density. The mean power within 50 km of the shore is determined to be low, whereas higher power is available further offshore beyond the 3500 m contour line. The tidal stream power potential along the coast of the state of Georgia is evaluated based on the NOAA tidal predictions for maximum tidal currents and three dimensional numerical modeling of the currents with Regional Ocean Modeling System (ROMS). The modeling results are validated against the available measurements. This region has low to moderate average tidal currents along most of the coast, but with the possibility of very strong local currents within its complex network of tidal rivers and inlets between barrier islands. Tidal stream power extraction is simulated with a momentum sink in the numerical models at the estuary scale to investigate effect of power extraction on the estuarine hydrodynamics. It is found that different power extraction schemes might have counterintuitive effects on the estuarial hydrodynamics and the extraction efficiency. A multi-criteria method that accounts for the physical, environmental and socioeconomic constraints for tidal power conversion schemes is proposed to select favorable locations and to rank them according to their suitability. For this purpose, the model results are incorporated into a Geographical Information System (GIS) database together with other geospatial datasets relevant to the site selection methodology. The methodology is applied to the Georgia coast and the candidate areas with potential are marked.

Oxide nanowire arrays are playing an important role in energy sciences nowadays, including energy harvesting, energy storage, and power management. By utilizing a wet chemical growth method, we demonstrated the capabilities of synthesizing density controlled vertical ZnO nanowire arrays on a general substrate, optimizing the aspect ratio of the vertical ZnO nanowire arrays guided by a statistical method, epitaxially growing patterned vertical ZnO nanowire arrays on inorganic substrates, epitaxially growing patterned horizontal ZnO nanowire arrays on non-polar ZnO substrates, and the lift-off of the horizontal ZnO nanowire arrays onto general flexible substrates. In addition, single crystalline PbZrxTi1-xO3 (PZT) nanowire arrays were epitaxially grown on conductive and nonconductive substrates by hydrothermal decomposition. Beyond that, based on the as-synthesized ZnO nanowire arrays, we demonstrated multilayered three dimensionally integrated direct current and alternating current nanogenerators. By integrating a ZnO nanowire based nanogenerator with a ZnO nanowire based nanosensor, we demonstrated solely ZnO nanowire based self-powered nanosystems. Also, utilizing a commercial full-wave bridge rectifier, we rectified the alternating output charges of the nanogenerator based on PZT nanowire arrays, and the rectified charges were stored into capacitors, which were later discharged to light up a laser diode (LD). In addition, blue/near-ultraviolet (UV) light emitting diodes (LED) composed of ordered ZnO nanowire arrays on p-GaN wafers were presented.