Papers by Keyword: Electricity Generation

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Authors: Wen Qiang Zhang, Hao Bai Wen, Fei Fei Zhuang, Shuo Jin Ren, Ye Wen, Ke Liang Li, Gong Ming Xin
Abstract: A system is designed to combine the solar disc power generation and desalination in this paper. The steam generated in the solar disc system goes into the low-parameter steam turbine to produce electricity. Then the exhaust steam heats seawater in the desalination device, acting as a low temperature heat reservoir which makes the seawater boils to dilute. A tracking system adopting the "Date-time - latitude-longitude - sunlight incident angle" match pattern is designed to track the position of the sun, in order to achieve the maximum solar power input.
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Authors: Takayuki Takeshita
Abstract: Ocean thermal energy conversion (OTEC) is a form of solar energy that can produce electricity on a non-intermittent basis. In this paper, a regionally disaggregated global energy system model with a detailed treatment of the electricity supply sector is used to examine the competitiveness of OTEC technologies for each of 48 world regions over the period to 2050 under a constraint of halving global energy-related CO2 emissions in 2050 compared to the 2000 level. It is first shown that an over 20% reduction in the reference OTEC electricity generation costs would enable OTEC technologies to account for a noticeable share of the global electricity generation by 2050 under the CO2 constraint. It is then shown that by-products from OTEC technologies could significantly enhance their cost competitiveness in the global electricity generation sector. It is finally shown that southeastern Asia (mainly Indonesia and Timor-Leste), Latin America (mainly Central America), and Oceania are the regions attractive for the deployment of OTEC technologies.
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Authors: Takayuki Takeshita
Abstract: In this paper, a regionally disaggregated global energy system model treating the electricity supply sector in detail is used to examine the competitiveness of wave energy technologies for each of 48 world regions over the period to 2050 under a constraint of halving global energy-related CO2 emissions in 2050 compared to the 2000 level. It is first found that wave energy continues to be uncompetitive until 2050 due to (1) its high cost and (2) the large seasonal variability of wave power. Even if the reference wave electricity generation costs are assumed to be reduced by 90%, the latter factor severely limits the market penetration of wave energy technologies. It is then found that the UK and Ireland, Australia and New Zealand, Japan, South Africa, the western US, Latin America, Canada, and Spain and Portugal are the regions promising for wave energy deployment. Not only low-cost and abundant wave energy resources, but also the peak electric load in winter, the relatively small seasonal variability of wave power, and/or the low competitiveness of power sources substitutable by wave energy are the reasons for this.
356
Authors: Xiao Li Wang, Chen Wu, Jia Qi Zhang, Qiang Long Chi, Si Si Tian
Abstract: In this paper, it has been studied the acclimation stage of a synthetic wastewater fed with glucose as a carbon source, using a tow-chambers microbial fuel cells (MFCs). Special attention has been paid to the start-up. During the acclimation period, the microbial fuel cells (MFCs) will be exposed to variations in operating parameters. Hence, the acclimation stage of MFCs, exposed to variation in the influent COD, operating temperature, and electron acceptor, was investigated in the terms of power density, COD removal efficiency, and voltage while treating a synthetic wastewater. The power density is increased and the acclimation period is prolonged with the increase of the influent COD up to meet steady-state conditions. It is important to note that the acclimation of MFCs is not only impacted by the electricity-generating bacteria, but by the whole biological. The highest steady-state voltage, which is about 404mV, is obtained at 35°C, comparing to the operating temperature of 15°C or 25°C. In addition, the electron acceptor will obviously influence the steady-state voltage and start-up period.
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Authors: Chuan Chen, Qi Wang, Rui Ying Fang
Abstract: China has been experiencing a remarkable economic growth for the past three decades accompanied by significant energy consumption and environmental pollution, which led to great pressure on energy supply and environmental protection. The development of renewable energy has therefore become a major strategic issue for the country’s energy security, economic development, environmental sustainability and social stability. Meanwhile the participation of the private sector into the renewable energy sector has become increasingly important and necessary to utilize their knowledge, skills and resources as an effective supplement to the Chinese government which dominates the sector but suffers low efficiency and declining credit lines. Aiming at a better understanding of the activities and trends of the private sector in the renewable energy sector of China, this study retrieved project level data from the Private Participation in Infrastructure (PPI) database of the World Bank, and examined the data from various dimensions, such as investment size, PPI type, technology, and geographical distribution. Important and interesting observations were drawn such as emerging western China market and fast growing biomass sub-sector. A comparison between conventional fossil fuel projects and renewable energy projects was also undertaken in terms of unit cost and the results confirmed the high installation cost of renewable energy projects and highlighted the importance of government subsidies at present and technological advances in the long run to support the development of renewable energy. The empirical findings, although restricted by shortcomings of the data source, can provide valuable implications to policy makers and infrastructure investors interested in the renewable energy market of China.
488
Authors: Prachuab Peerapong, Bundit Limmeechokchai
Abstract: Photovoltaic (PV) has recently undergone impressive growth and substantial cost decreases. Basically wafer-based crystalline-Si PV technologies have the advantage of higher module efficiency as compared to thin-film PV, but thin-film PV has the advantage of lower production cost. The silicon-based solar PV needs light-induced charge separation at the p-n junction between two slices (wafers) of doped silicon in either single-crystal silicon (sc-Si) or polycrystalline (poly-Si). However until recently thin-film PV modules both amorphous silicon (a-Si) and non-silicon thin film technology have been advantageous developed. Metallic based modules such as cadmium telluride, CdTe and copper indium gallium diselenide, CIGS thin-film PV technologies have currently efficiencies of 16.1% and 15.7%, respectively. A high efficiency makes thin-film PV technologies more competitive with wafer-based crystalline-Si PV. This study investigates the electricity generation of both silicon based and non-silicon based solar PV modules. The implementation uses solar irradiation with average of higher than 18 MJ/m2.day in high solar radiation provinces in Thailand. A High solar radiation is observed in mostly in central and the east regions of the country. The result shows that the commercial amorphous PV module is appropriate for large scale installation while wafer-based crystalline-Si PV can be installed both in cases of solar rooftop and solar PV farm. Thin-film PV modules both silicon based (a-Si) and non-silicon based is basically appropriate for small installation such as solar rooftop and building integrated PV (BIPV). But in the near future the metallic based PV modules will be competitive with crystalline-Si PV in terms of both efficiency and with its lower cost.
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Authors: Sureeporn Meehom, Wipanan Iaprasert, Thanatchai Kulworawanichpong
Abstract: Electricity is a pre-requisite for technological progress and economy growth. Thailand has been facing an electric energy crisis in inadequate electricity generation capacity compared with the demand. It is essential to replace the conventional energy (e.g. fossil fuels) and electricity import with renewable energy resources, particularly biogas that can be play a major role to meet the electricity demand. This paper explores the current state of biogas energy potential from livestock manures in Nakhonratchasima, Thailand. The results show a potential of electricity produced from animal manures of cattle, buffalo, swine and poultry. The total annual recoverable rates of livestock manures and biogas yield in Nakhonratchasima Province are 431.334 Mtonne of dry matter and 119,631 Mm3, respectively. In energy terms, the annual amount of the recoverable biogas resources is equivalent to 2,691.691 PJ or 748 TWh. This total amount of available biogas energy potential can meet anticipated electricity demand. Therefore, the assessment of biogas energy resources will make a significant utilization of energy management in the future.
1104
Authors: Lin Xu, Wei Nan Bai, Jing Yu Ru, Qiang Li, Jia Ming Li
Abstract: This project is intended to design one kind of automatically reciprocating pedal-powered electricity generator (ARPPEG) in conjunction with the management and control over harvesting the kinetic energy, electricity generation, the electricity storage and the output of electricity. According to the operation testing results, this system has been proved to effective in power generation. In view of the simple structure and low-costs of this system without territory and time limits, the application of ARPPEG designed by us could open a new path to saving the energy and helping build a new energy society.
735
Authors: Hua Min Li
Abstract: The ways of using coal gangue in electricity generation, chemical utilization and building-material production are introduced and national coal gangue utilization status and development trend is analyzed in this paper. Pointing out the main problems in present utilization of coal gangues, suggestions on coal gangue resource utilization are given that provide reference for eliminating coal gangue pollution, enhancing environmental protection and saving up energy.
2364
Authors: Jian Chao Hou, Juan Guo
Abstract: This paper analyzes the potential factors influencing the changes of CO2 emissions of the power generation for four provinces and one city in Eastern China during the period of 1995-2012 applying the Logarithmic Mean Divisia Index (LMDI) method. The changes of CO2 emissions in power generation are decomposed into three factors: electricity production effect, electricity generation structural effect and energy generation intensity effect. The empirical results show production effect is the major factor responsible for rise in power generation CO2 emissions during the period 1995-2012. With the exception of Fujian province the energy generation intensity effect is mainly responsible for the decrease in CO2 emissions over the period 1995–2012.The contribution of generation structure effect to CO2 emissions changes is different across the regions in Eastern China and it had little effect on CO2 emissions changes. The empirical results also show that there is a potential of efficiency improvement of fired power plants and optimization of the power generation structure.
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