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No description available.

The purpose of the work was to investigate the thermal stratification in solar storage containers. Three domestic thermally stratified hot water storage containers were designed with the main object of improving and stabilizing thermal stratification of the stored water as a means of improving the overall efficiency of solar water heating systems. Testing of the three storage containers was carried out under similar conditions and the results showedthat TYPEI storage container behaves as a three-segment stratified system, TYPEII storage container behaves as a two-segment stratified system with a thermocline occupying approximately half of the height of the storage container, and TYPEIII storage container behaves as a two-segment stratified system with a thermocline occupying two thirds of the height of the storage container. It was found that TYPEI storage container, with a LID equal to 3/1, gave the best results in terms of heat collected, and also had the maximum stratification which is the main goal of this study. The effect of each of three flow rates (0.01 kg/Sm2 , 0.015 kg/sm2 , 0.02 kg/sm2 ) on stratification was studied and it was found that the flow rate of 0.01 kg/Sm2 of collector area gave the better result. A low-cost simulator for studying the performance of solar energy storage containers was designed. The design was based on a relatively inexpensive micro-computer linking into a mains power regulator with an 8-bit digital control system. Meteorological data was used to compute radiation income on any inclined plane and the output to the power regulator is controlled by the computed instantaneJus rate of energy gain from the collector system undergoing simulation. A comparison has been made between some of the experimental and theoretical results for mE I storage container. The theoretical prediction was based on two mathematical IOOdels of Duffie and 2 44 Beckman , and Close • A computer system model has been developed to assist in the design of a solar water heating system.

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No description available.

This thesis aims to apply the concept of the Ecological Footprint (EF) to examine the impact that the tourism industry has on the environment through energy consumption and also investigates patterns of energy-consuming behaviour among tourists and tourism businesses. EF is becoming an increasingly popular analytical tool in tourism studies. However, at present most attention has fallen on its value for studying tourism in international level. Moreover, very few studies have taken account of the influence of social factors when making EF calculations linked to tourism. As a consequence of these biases, there is currently a need for studies of tourism which take account of EFs at the destination level and how the behaviour of tourists and tourism businesses affects energy consumption at holiday destinations. This study addresses this gap by investigating the EF of energy-consuming behaviour linked to tourists and tourism businesses at a particular holiday destination, namely Koh Samui in Thailand, and also by exploring the factors which influence this kind of behaviour. The findings of this study show that most tourists rely on modes of transport which release high levels of CO2 (especially long haul flights). In the case of Thailand, a majority of tourists fly from Bangkok to Koh Samui and then use private cars to get around the island. Energy intensive electrical appliances such as air conditioning and tankless hot water heaters were widely used in accommodation, while beach activities, which generally have a low carbon footprint, attracted the largest numbers of tourists. It was also found that demographic factors, including travel behaviour and concern for the environment, influenced these kinds of behaviour in various ways. As regards different types of tourism business, in the accommodation sector hotels used the largest quantities of electricity while tour operators used more diesel and petrol than any other type of tourism business. Furthermore, it was also found that even though respondents who stayed in five-star hotels expressed the greatest level of concern for climate change, they still considered their own convenience and satisfaction to be their highest priorities. Tourism on Koh Samui consumed about 54.55 PJ of energy in 2007 and thus needed 3.41 gha of forest land to absorb the resulting CO2 emissions. Given that this figure exceeds the current world-average biocapacity of 1.8 gha, it can be stated that tourism on Koh Samui is currently unsustainable. This study highlights the relationship between the EF of tourism at a particular holiday destination and the energy-consuming behaviour of both tourists and tourism businesses. In this way, it is shown here that excessive energy consumption combined with a lack of effective energy management in the business sector can lead to the development of an unsustainable EF. In response to this finding, practitioners and policy-makers should consider ways of mitigating EFs linked to tourism.

This thesis considers India's pursuit of energy security. Defining energy security within traditional parameters of supply, delivery, diversification of fuels and suppliers, and affordable prices; the work considers India's energy security condition by surveying the core energy sectors including coal, oil and gas, hydroelectricity, nuclear power and renewables. India's pursuit of energy security is then disaggregated into domestic and international arenas and both are analysed in turn. Considerable attention is paid to the international dimension where India's quest to acquire energy resources is contextualised within bilateral relations with specific countries. What the proceeding analysis makes clear is that the international arena offers considerable opportunities, but also constraints on, the realisation of greater energy security. Chapter one analyses global trends in the main energy sectors of coal, oil, natural gas, hydroelectricity, nuclear power and renewables. Historically, the fortunes of the global energy sectors have mirrored trends in the global economy. Since 2008, most of the world's major industrialised economies have experienced negative or greatly reduced levels of growth. This is primarily due to the proliferation of vast quantities of debt that have capsized several financial institutions and are adversely affecting the liquidity and solvency of many developed governments. The global energy sectors have also been deeply affected by the economic downturn with access to funds for the development of new infrastructure squeezed. The recent poor economic growth of these countries has further accentuated the downward trend they have experienced in energy consumption. Nevertheless, many parts of the developing world, including India, have only been marginally affected by the global economic downturn and continue to develop rapidly. Consequentially most of the growth in demand for energy is coming from developing countries, particularly India. Although there are slight variations depending on sector, this dual trend of stagnation in the developed world and rapid growth in the developing is one ofthe recurring themes in the global energy markets. It is within this context that the second chapter considers India's energy security condition. Detailed analysis of the coal, oil, gas, hydroelectric and renewable sectors demonstrate succinctly that India is experiencing considerable growing pains. While several challenges are unique to each sector the chapter also identifies several systemic problems, including insufficient supply, rampant demand, a tendency to import.

The global requirement for sustainable energy provision will become increasingly important over the next fifty years as the environmental effects of fossil fuel use become apparent. Therefore, the issues surrounding integration of renewable energy supplies need to be considered carefully. The focus of this work was the development of a decision support framework that will aid the design of sustainable energy systems for the supply of electricity, heat, hot water and fuel for transportation. Issues requiring consideration in high percentage renewable energy systems include the reliability of the supply when intermittent sources of electricity are being used, and the subsequent necessity for storage and back-up generation. In order to allow the modelling of realistic integrated systems that supply the total energy needs of an area, the production of fuels derived from biomass and waste and their use in a variety of different plant types (e. g. vehicles, engines, turbines, fuel cells, electrolysers, heating and hot water storage systems) is an important consideration. The temporal nature of both intermittent electricity and derived fuel supplies must be taken into account in any analysis. Existing demand and supply matching software has been enhanced to allow the full analysis described. Generic algorithms have been developed to allow the behaviour of a comprehensive list of plant types and methods for producing derived fuels to be modelled, which require only available process and manufacturers' data. The program is flexible, generic and easy to use, allowing a variety of supply strategies to be analysed. This has been shown through the study of a small Scottish island, which highlights the importance of derived fuel production and use. This work has succeeded in developing a more complete tool for analysing the feasibility of integrated renewable energy systems. This will allow informed decisions to be made about the technical feasibility of supply mix and control strategies, plant type and sizing, suitable fuel production, and fuel and energy storage sizing, for any given area and range of supply options.