Literatura académica sobre el tema "Sustainable energy supplies"
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Artículos de revistas sobre el tema "Sustainable energy supplies"
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Castro e Silva, Andreia de, Robson Seleme, Wiliam de Assis Silva, Izabel Cristina Zattar, Elpidio Oscar Benitez Nara, Osiris Canciglieri Júnior y Lisianne Brittes Benitez. "Evaluation and Choice Criteria of Sustainable Suppliers in the Construction Industry: A Comparative Study in Brazilian Companies". Sustainability 14, n.º 23 (25 de noviembre de 2022): 15711. http://dx.doi.org/10.3390/su142315711.
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This article seeks to develop criteria for evaluating sustainable suppliers in civil construction and to contribute to improving the understanding of the factors that influence the selection of sustainable suppliers. Organizations should develop strategies that motivate suppliers to participate in green supply-chain initiatives, as supplier selection can directly interfere with sustainability performance at work. However, there is a gap in the research that addresses the selection of sustainable suppliers in the Brazilian context of civil construction related to certifications for sustainable construction. To fill this gap, the present article used literature-review methodologies, content analysis, data triangulation, and field research through a survey. The literature review identifies the certifiable standards for sustainable construction most cited in the literature: LEED, AQUA, BREEAM, and CASBEE. The standards analysis allows us to identify seven similar supply criteria for sustainable construction certifications. The parameters of each certification were analyzed to define those related to the selection of suppliers, identifying those that qualify a supplier as environmentally sustainable. We found that 60.7% of respondents work in companies without certifications, 75% know sustainable procurement, 50% of companies had established a sustainable procurement policy, and 83% of companies had a strategy for selecting suppliers. The results of this research contribute to construction companies being able to rank the importance of these criteria when choosing a supplier, in addition to having access to the mapping of essential criteria, allowing a search for greater interaction between the links of the green supply chain and rendering buildings and supplies more sustainable.
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GHOSE, MRINAL. "Environmentally Sustainable Supplies of Energy with Specific Reference to Geothermal Energy". Energy Sources 26, n.º 6 (mayo de 2004): 531–39. http://dx.doi.org/10.1080/00908310490427977.
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Stöglehner, Gernot. "Ecological footprint — a tool for assessing sustainable energy supplies". Journal of Cleaner Production 11, n.º 3 (mayo de 2003): 267–77. http://dx.doi.org/10.1016/s0959-6526(02)00046-x.
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Pryiatelchuk, O. A. y Sara Amirabbas. "RENEWABLE ENERGY FOR SUSTAINABLE DEVELOPMENT IN MIDDLE EAST". Actual Problems of International Relations, n.º 148 (2021): 70–80. http://dx.doi.org/10.17721/apmv.2021.148.1.70-80.
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Improving energy efficiency is one of the main ways to reduce energy pollution that leads to economic development, increasing energy access and better life. That can result in reducing fossil fuel use and growing clean energy supplies. The Gulf countries have as many renewable resources as hydrocarbons like sunshine, considerable wind resources, and geothermal. The economy of the Middle east deeplydepends on fossil fuel export. Declining fossil fuel supplies and rising energy prices are driving global energy supplies to renewables energies. Although the Middle East region, due to its special geographical features, has significant potential for the growth of renewable energy sources, they have not been developed yet. It overviews the energy situation and sustainability, economic potential of renewable energy, policies for energy systems over the recent decades in six resource-rich countries in the middle east. In addition, along with renewable energy technologies, possible ways to solve current environmental problems are recognized. The methodology of this work is PESTLE analysis of these countries' energy status to develop a long-term mechanism for sustainable and secure energy for the Middle East based on Political, Economic, Social, Technological, Legal, Environmental. Also, it identifies challenges that restrict the development of renewable energy technologies in the Middle East. By analyzing the status of energy in recent decades, the importance of implementation of effective energy policies to develop sustainable energy can be realized. Key words: energy source, sustainable future, renewable, effective policy, resource-rich countries.
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Karlen, Douglas L. y Jane M. F. Johnson. "Crop Residue Considerations for Sustainable Bioenergy Feedstock Supplies". BioEnergy Research 7, n.º 2 (7 de febrero de 2014): 465–67. http://dx.doi.org/10.1007/s12155-014-9407-y.
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Kung, Chih-Chun y Bruce McCarl. "Sustainable Energy Development under Climate Change". Sustainability 10, n.º 9 (13 de septiembre de 2018): 3269. http://dx.doi.org/10.3390/su10093269.
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The world faces unprecedented threats from climate change and increasing variability, which severely impacts human society and the natural environment. To reduce future climate change and ensure our economies can grow in a sustainable way, sustainable energy development is considered to be an effective approach. In this context, sustainable energy development involves augmenting our energy supplies and managing demands in a fashion that societal energy needs are met with a minimal effect on greenhouse gas emissions and a nominal resultant contribution to future climate change. In this Special Issue, research papers focus on the role of sustainable energy development (while addressing important dimensions of sustainability), which mandates an inter-disciplinary perspective in all articles. We collected 11 such papers that have analyzed a broad array of topics related to bioenergy, wind power, industrial innovation, and climate change mitigation. These papers show the varied application of renewable energy and climate change energy responses, while providing meaningful decision-making information and policy implications.
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Chu, Wenxiao, Francesco Calise, Neven Duić, Poul Alberg Østergaard, Maria Vicidomini y Qiuwang Wang. "Recent Advances in Technology, Strategy and Application of Sustainable Energy Systems". Energies 13, n.º 19 (8 de octubre de 2020): 5229. http://dx.doi.org/10.3390/en13195229.
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The global COVID-19 pandemic has had strong impacts on national and international freight, construction and tourism industry, supply chains, and has resulted in a rapid decline in the demand for traditional energy sources. In fact, research has outlined that urban areas depend on global supply chains for their day-to-day basic functions, including energy supplies, food and safe access to potable water. The disruption of global supply chains can leave many urban areas in a very vulnerable position, in which their citizens may struggle to obtain their basic supplies, as the COVID-19 crisis has recently shown. Therefore, solutions aiming to enhance local food, water and energy production systems, even in urban environments, have to be pursued. The COVID-19 crisis has also highlighted in the scientific community the problem of people’s exposure to outdoor and indoor pollution, confirmed as a key element for the increase both in the transmission and severity of the contagion, on top of involving health risks on their own. In this context, most nations are going to adopt new preferential policies to stimulate the development of relevant sustainable energy industries, based on the electrification of the systems supplied by renewable energy sources as confirmed by the International Energy Agency (IEA). Thus, while there is ongoing research focusing on a COVID 19 vaccine, there is also a need for researchers to work cooperatively on novel strategies for world economic recovery incorporating renewable energy policy, technology and management. In this framework, the Sustainable Development of Energy, Water and Environment Systems (SDEWES) conference provides a good platform for researchers and other experts to exchange their academic thoughts, promoting the development and improvements on the renewable energy technologies as well as their role in systems and in the transition towards sustainable energy systems. The 14th SDEWES Conference was held in Dubrovnik, Croatia. It brought together around 570 researchers from 55 countries in the field of sustainable development. The present Special Issue of Energies, specifically dedicated to the 14th SDEWES Conference, focuses on four main fields: energy policy for sustainable development, biomass energy application, building energy saving, and power plant and electric systems.
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Zhang, Weilong y Lin Lu. "Energy performance and heat transfer characteristics of photovoltaic double skin facades (PV-DSFs): a review". Sustainable Energy & Fuels 1, n.º 7 (2017): 1502–15. http://dx.doi.org/10.1039/c7se00175d.
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Ahmadi, Esmaeil, Benjamin McLellan, Seiichi Ogata, Behnam Mohammadi-Ivatloo y Tetsuo Tezuka. "An Integrated Planning Framework for Sustainable Water and Energy Supply". Sustainability 12, n.º 10 (24 de mayo de 2020): 4295. http://dx.doi.org/10.3390/su12104295.
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This study aims to reveal the economic, technical, and environmental impacts of different system configurations (centralized or decentralized, components, and technologies) on transition plans to achieve a higher share of renewable energy and desalination supplies for regions facing water scarcity. The main contribution of this research is the comparative evaluation of on-grid decentralized or distributed renewable-powered desalination systems for sustainable water and energy supply planning. Applying a novel nexus approach, an interactive multi-period planning model is developed to highlight synergies and to identify conflicts of planning both energy and water sectors at the same time as endogenous subsystems of one overall system. For studying these synergies in this study, the pace of technology deployment and the path of decline in overall costs are assumed to be a function of experience and knowledge as two-factor learning curves. Using data from 81 projects, the levelized cost and capacity factor of utility-scale photovoltaic and wind supplies in the Middle East were calculated. The results indicate that a scenario with a decentralized water sector and renewable-powered multiple-effect distillation technology has the best overall performance among the proposed scenarios.
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Shahzad, Muhammad Wakil, Muhammad Burhan y Kim Choon Ng. "Energy Storage & Desalination". International Journal of Computational Physics Series 1, n.º 2 (5 de marzo de 2018): 52–60. http://dx.doi.org/10.29167/a1i2p52-60.
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In Gulf Cooperation Council (GCC) countries, about 40% of primary energy is consumed for cogeneration based power and desalination plants. In the past, many studies were focused on renewable energies based desalination processes to accommodate 5 fold increase in demand by 2050 but they were not commercialized due to intermittent nature of renewable energy such as solar and wind. We proposed highly efficient energy storage material, Magnesium oxide (MgO), system integrated with innovative hybrid desalination cycle (MEDAD) for future sustainable desalination water supplies. The condensation of Mg(OH)2 dehydration vapor during day operation with concentrated solar energy and exothermic hydration of MgO at night can produce 24 hour thermal energy for desalination cycle without any interruption. It was showed that, Mg(OH)2 dehydration vapor condensation produce 120C and MgO hydration exothermic reaction produce 140C heat during day and night operation respectively correspond to energy storage of 81kJ/mol and 41kJ/mol. In addition, the hybrid MEDAD cycle can boost water production to more than 2 fold as compared to conventional desalination processes at same operating temperature due to excellent thermodynamic synergy. We believe that the proposed energy storage driven desalination cycle is the most sustainable solution for future water supplies.
Tesis sobre el tema "Sustainable energy supplies"
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Kirke, Brian Kinloch y n/a. "Evaluation of Self-Starting Vertical Axis Wind Turbines for Stand-Alone Applications". Griffith University. School of Engineering, 1998. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050916.120408.
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There is an urgent need for economical, clean, sustainable energy supplies, not only in densely populated areas where electricity grids are appropriate, but also in rural areas where stand-alone power supply systems are often more suitable. Although electrical power supply is very versatile and convenient, it introduces unnecessary complexity for some off-grid applications where direct mechanical shaft power can conveniently be provided by a wind turbine. Wind energy is one of the more promising renewable energy sources. Most wind turbines are of the horizontal axis type, but vertical axis wind turbines or VAWTs have some advantages for direct mechanical drive applications. They need no tail or yaw mechanism to orient them into the wind and power is easily transmitted via a vertical shaft to a load at ground level. Blades may be of uniform section and untwisted, making them relatively easy to fabricate or extrude, unlike the blades of horizontal axis wind turbines (HAWTs) which should be twisted and tapered for optimum performance. Savonius rotor VAWTs are simple and may have a place where the power requirement is only a few Watts, but they are inefficient and uneconomical for applications with larger power requirements. VAWTs based on the Darrieus rotor principle are potentially more efficient and more economical, but those with fixed pitch blades have hitherto been regarded as unsuitable for stand-alone use due to their lack of starting torque and low speed torque. This starting torque problem can be overcome by using variable pitch blades, but most existing variable pitch VAWTs, variously known as giromills or cycloturbines, need wind direction sensors, microprocessors and servomotors to control the blade pitch, making them impracticable for stand-alone, non-electrical applications. A simpler but less well known concept is passive or self-acting variable pitch in which the blades are free to pitch under the combined action of aerodynamic and inertial forces in such a way that a favourable blade angle of attack is maintained without the complexity of conventional variable pitch systems. Several fonns of self-acting variable pitch VAWTs or SAPVAWTs have been described in the literature, several patents exist for variants on the concept, and at least two companies world-wide have attempted to commercialise their designs. However the aerodynamic behaviour of these devices has been little understood and most designs appear to have been based on nothing more than a qualitative appreciation of the potential advantages of the concept. This thesis assesses the potential of both fixed and passive variable pitch vertical axis wind turbines to provide economical stand-alone power for direct mechanical drive applications. It is shown that the starting torque and low speed torque problems of VAWTs can be overcome either by passive variable pitch or by a combination of suitable blade aerofoil sections, either rigid or flexible, and transmissions which unload the rotor at low speeds so that high starting torque is not necessary. The work done for this thesis is made up of a sequence of stages, each following logically from the previous one: 1. Several tasks have been identified which could be performed effectively by a self-starting vertical axis wind turbine using direct mechanical drive. These include, a. pumping water, b. purifying and/or desalinating water by reverse osmosis, c. heating and cooling using vapour compression heat pumps, d. mixing and aerating water bodies and e. heating water by fluid turbulence. Thus it is apparent that such a system has the potential to make a useful contribution to society. 2. A literature survey of existing VAWT designs has been carried out to assess whether any are suitable for these applications. 3. As no suitable existing design was identified, an improved form of SAPVAWT has been developed and patented. 4. To optimise the performance of the improved SAPVAWT, a mathematical model has been developed in collaboration with Mr Leo Lazauskas of the University of Adelaide (see Kirke and Lazauskas, 1991, Lazauskas and Kirke, 1992). As far as the author of the present thesis is aware, this is the only existing mathematical model able to predict the performance of this particular type of SAPVAWT, and one of only two worldwide which model SAPVAWTs. 5. In order to use the mathematical model to predict the performance of a given SAPVAWT, it is necessary to have lift, drag and moment data for the aerofoil profile to be used, over a wide range of incidence and Reynolds numbers. A literature search has revealed large gaps in the existing data. 6. Wind tunnel testing has been carried out to assess the effect of camber on the performance of one set of NACA sections at low Reynolds number, and performance figures for other sections have been estimated by interpolation from existing data. 7. Using the assembled aerofoil data, both experimental and estimated, the mathematical model has been used to predict the performance of both fixed and variable pitch VAWTs. It has been found to predict correctly the performance of known fixed pitch VAWTs and has then been used to predict the performance of fixed pitch VAWTs with cambered blades using newly developed profiles that exhibit superior characteristics at low Reynolds numbers. Results indicate that fixed pitch VAWTs using these blade sections should self-start reliably. 8. To validate the mathematical model predictions for self-acting variable pitch, a two metre diameter physical model has been built and tested in a wind tunnel, and acceptable agreement has been obtained between predicted and measured performance. 9. To demonstrate the performance of a SAP VA WT under field conditions, a six metre diameter turbine has been designed, fabricated, erected and tested. 10. Because a prime mover such as a wind turbine is of no use unless it drives a toad, particular attention has been paid to the behaviour of complete systems, including the wind turbine, the transmission and the load. It is concluded that VAWTs with the improved self-starting and low speed torque characteristics described in this thesis have considerable potential in stand-alone, direct mechanical drive applications.
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Kirke, Brian. "Evaluation of Self-Starting Vertical Axis Wind Turbines for Stand-Alone Applications". Thesis, Griffith University, 1998. http://hdl.handle.net/10072/366205.
Texto completoResumen
There is an urgent need for economical, clean, sustainable energy supplies, not only in densely populated areas where electricity grids are appropriate, but also in rural areas where stand-alone power supply systems are often more suitable. Although electrical power supply is very versatile and convenient, it introduces unnecessary complexity for some off-grid applications where direct mechanical shaft power can conveniently be provided by a wind turbine. Wind energy is one of the more promising renewable energy sources. Most wind turbines are of the horizontal axis type, but vertical axis wind turbines or VAWTs have some advantages for direct mechanical drive applications. They need no tail or yaw mechanism to orient them into the wind and power is easily transmitted via a vertical shaft to a load at ground level. Blades may be of uniform section and untwisted, making them relatively easy to fabricate or extrude, unlike the blades of horizontal axis wind turbines (HAWTs) which should be twisted and tapered for optimum performance. Savonius rotor VAWTs are simple and may have a place where the power requirement is only a few Watts, but they are inefficient and uneconomical for applications with larger power requirements. VAWTs based on the Darrieus rotor principle are potentially more efficient and more economical, but those with fixed pitch blades have hitherto been regarded as unsuitable for stand-alone use due to their lack of starting torque and low speed torque. This starting torque problem can be overcome by using variable pitch blades, but most existing variable pitch VAWTs, variously known as giromills or cycloturbines, need wind direction sensors, microprocessors and servomotors to control the blade pitch, making them impracticable for stand-alone, non-electrical applications. A simpler but less well known concept is passive or self-acting variable pitch in which the blades are free to pitch under the combined action of aerodynamic and inertial forces in such a way that a favourable blade angle of attack is maintained without the complexity of conventional variable pitch systems. Several fonns of self-acting variable pitch VAWTs or SAPVAWTs have been described in the literature, several patents exist for variants on the concept, and at least two companies world-wide have attempted to commercialise their designs. However the aerodynamic behaviour of these devices has been little understood and most designs appear to have been based on nothing more than a qualitative appreciation of the potential advantages of the concept. This thesis assesses the potential of both fixed and passive variable pitch vertical axis wind turbines to provide economical stand-alone power for direct mechanical drive applications. It is shown that the starting torque and low speed torque problems of VAWTs can be overcome either by passive variable pitch or by a combination of suitable blade aerofoil sections, either rigid or flexible, and transmissions which unload the rotor at low speeds so that high starting torque is not necessary. The work done for this thesis is made up of a sequence of stages, each following logically from the previous one: 1. Several tasks have been identified which could be performed effectively by a self-starting vertical axis wind turbine using direct mechanical drive. These include, a. pumping water, b. purifying and/or desalinating water by reverse osmosis, c. heating and cooling using vapour compression heat pumps, d. mixing and aerating water bodies and e. heating water by fluid turbulence. Thus it is apparent that such a system has the potential to make a useful contribution to society. 2. A literature survey of existing VAWT designs has been carried out to assess whether any are suitable for these applications. 3. As no suitable existing design was identified, an improved form of SAPVAWT has been developed and patented. 4. To optimise the performance of the improved SAPVAWT, a mathematical model has been developed in collaboration with Mr Leo Lazauskas of the University of Adelaide (see Kirke and Lazauskas, 1991, Lazauskas and Kirke, 1992). As far as the author of the present thesis is aware, this is the only existing mathematical model able to predict the performance of this particular type of SAPVAWT, and one of only two worldwide which model SAPVAWTs. 5. In order to use the mathematical model to predict the performance of a given SAPVAWT, it is necessary to have lift, drag and moment data for the aerofoil profile to be used, over a wide range of incidence and Reynolds numbers. A literature search has revealed large gaps in the existing data. 6. Wind tunnel testing has been carried out to assess the effect of camber on the performance of one set of NACA sections at low Reynolds number, and performance figures for other sections have been estimated by interpolation from existing data. 7. Using the assembled aerofoil data, both experimental and estimated, the mathematical model has been used to predict the performance of both fixed and variable pitch VAWTs. It has been found to predict correctly the performance of known fixed pitch VAWTs and has then been used to predict the performance of fixed pitch VAWTs with cambered blades using newly developed profiles that exhibit superior characteristics at low Reynolds numbers. Results indicate that fixed pitch VAWTs using these blade sections should self-start reliably. 8. To validate the mathematical model predictions for self-acting variable pitch, a two metre diameter physical model has been built and tested in a wind tunnel, and acceptable agreement has been obtained between predicted and measured performance. 9. To demonstrate the performance of a SAP VA WT under field conditions, a six metre diameter turbine has been designed, fabricated, erected and tested. 10. Because a prime mover such as a wind turbine is of no use unless it drives a toad, particular attention has been paid to the behaviour of complete systems, including the wind turbine, the transmission and the load. It is concluded that VAWTs with the improved self-starting and low speed torque characteristics described in this thesis have considerable potential in stand-alone, direct mechanical drive applications.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
Science, Environment, Engineering and Technology
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Rodriguez-Anderson, Santiago Martin. "Sensible Air to Air Heat Recovery Strategies in a Passive House". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2123.
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Due to rising energy costs and concerns about global climate change, high performance buildings are more in demand than ever before. With roughly 20% of the total energy consumption in the United States being devoted to residential use, this sector represents a significant opportunity for future savings. There are many guidelines and standards for reducing building energy consumption. One of the most stringent is the Passive House Standard. The standard requires that that air infiltration is less than or equal to 0.6 air changes per hour at a 50 Pascal pressure difference (ACH 50), annual heating energy is less than or equal to 15kWh/m2, and total annual source energy is less than or equal to 120 kWh/m2. For comparison, the typical West coast US residence has an ACH50 of 5 and annually uses more than 174 kWh/m2 of source energy according to the 2009 Residential Energy Consumption Survey. With these challenging requirements, successful implementation of the Passive House Standard requires effective strategies to substantially reduce energy consumption for all end uses.
Heating and cooling loads are low by necessity in a Passive House. As such this makes end uses like water heating a much larger fraction of total energy use than they would be in a typical building. When air to water heat pumps are employed the energy consumption by water heating is lowered significantly. By employing innovative heat recovery strategies the energy consumption for water heating and HVAC can be reduced even further. This study uses energy modeling and project cost analysis to evaluate three innovative control strategies. Results for a Passive House in Portland Oregon show a savings of about $70 annually with a payback period of 10 years. The same Passive House in Fairbanks Alaska with a different strategy would save $150 annually with a payback period of 5 years.
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Kaspo, Alex. "Sustainable Supplier Management : How can Telia Company develop the Sustainability Performance in their Supply Chain with a Supplier Code of Conduct?" Thesis, KTH, Energisystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298052.
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Sustainability has become a strategic and high priority focus area in today’s society. Responsible Business is an important part of the work towards a sustainable society, and Telia Company is one of the companies that actively works to take that responsibility. What is important when it comes to sustainability work in organizations is to look at a longer perspective than just the internal organization. Telia Company has a complex network of suppliers that extend around the world and influencing their sustainabilitywork is therefore critical in order to be able to take that responsibility.This qualitative study was carried out in collaboration with Telia Company with theaim of investigating how the company’s sustainability work in the supply chain can be developed with a code of conduct for suppliers. Today, Telia Company has a process for responsible sourcing where one of the cornerstones is their Supplier Code of Conduct document with requirements agreed and signed by suppliers and followed up by Telia Company continuously. The study’s questions were answered by performing mainly two analyzes. The first analysis is an Industry Peer Benchmarking. Based on the analysis of their sustainability processes within the supply chain, the results show that Telia Company in comparison has good and responsible sustainability work in place in its operations to manage risks in the supply chain. In the second part, an analysis is performed on a selection of Telia Company’s customers to examine how the company meets their set sustainability requirements. The results show that the company meets customers’ requirements in an overall way and that requirements are also in place to pass on these expectations to subcontractors. Previous research and studies also show a paradigm shift where digitalization and new trends are growing in society and affecting customers’ awareness. Accordingly, the measures that is proposed to Telia Company for further development of its supplier requirements are to perform trend analysis and market analysis continuously to meet the stakeholders’ requirements both today and inthe future.Hållbarhet har blivit en strategisk och högt prioriterad fråga i dagens samhälle. Ansvarsfullt företagande är en viktig del i arbetet mot ett hållbart samhälle, och Telia Company är ett av de företagen som aktivt arbetar med att ta det ansvaret. Det som är viktigt vad gäller hållbarhetsarbete i organisationer är att se till ett längre perspektiv än enbart den interna organisationen. Telia Company har ett komplext nät av leverantörer som sträcker sig världen över, och att påverka deras hållbarhetsarbete är därför kritiskt för att kunna ta sitt ansvar. Denna kvalitativa studie utfördes i samarbete med Telia Company med syftet att undersöka hur bolagets hållbarhetsarbete i försörjningskedjan kan utvecklas med en uppförandekod för leverantörer. Idag har Telia Company en process för ansvarsfulla inköp där en av byggstenarna är deras Supplier Code of Conduct dokument med krav som godkänns och skrivs under av leverantörer och följs upp kontinuerligt av Telia Company. Studiens frågeställningar besvarades genom utförandet av huvudsakligen två analyser. Den första analysen är en Industry Peer Benchmarking. Utifrån analysen av deras hållbarhetsprocesser inom försörjningskedjan visar resultatet att Telia Company i jämförelse har ett bra och ansvarsfullt hållbarhetsarbete på plats i sin verksamhet för att hantera risker i leverantörskedjan. I den andra delen utförs en analys på ett urval av Telia Company’s kunder för att undersöka hur bolaget uppfyller deras ställda hållbarhetskrav. Resultatet visar att bolaget möter kundernas krav på ett övergripande sätt och att krav även finns på plats för att föra vidare dessa förväntningar till underleverantörer. Tidigare studier visar även ett paradigmskifte där digitalisering och nya trender växer i samhället och påverkar kundernas medvetenhet. De åtgärder som därför föreslås till Telia Company för vidareutveckling av sina leverantörskrav är att utföra trendanalyser och marknadsanalyser kontinuerligt för att möta intressenternas krav både idag och i framtiden.
Libros sobre el tema "Sustainable energy supplies"
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Rao, Ashok D. Sustainable energy conversion for electricity and coproducts: Principles, technologies, and equipment. Hoboken: John Wiley Sons Inc., 2015.
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Materials for sustainable energy: A collection of peer-reviewed research and review articles from Nature Publishing Group. Hackensack, NJ: World Scientific, 2011.
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Minoli, Daniel. Designing green networks and network operations: Saving run-the-engine costs. Boca Raton: Auerbach Pub., 2010.
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Designing green networks and network operations. Boca Raton: Auerbach Pub., 2010.
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American Society of Civil Engineers, American Institute of Chemical Engineers y Minerals, Metals and Materials Society, eds. Engineering solutions for sustainability: Materials and resources ; workshop report and recommendations. Hoboken: Minerals, Metals & Materials Society, 2011.
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Daṿid, Kahen, ed. Fundamentals of materials for energy and environmental sustainability. Cambridge: Cambridge University Press, 2012.
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Droit et intégration des énergies renouvelables: Les règles juridiques relatives au développement et à l'utilisation des énergies renouvelables dans le bâtiment. Paris: Harmattan, 2011.
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The Australian green consumer guide: Choosing products for a healthier home, planet, and bank balance. Sydney: University of New South Wales Press, 2008.
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Evans, John. Elements of a Sustainable World. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198827832.001.0001.
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We have 118 known chemical elements as our palette in our context of sustaining our world. Our context is considered in terms of the four spheres of the ancient world: Earth, Air, Fire and Water. This book shows how chemical principles can be used to understand the pressures on our world spanning from greenhouse emissions through freshwater supplies to energy generation and storage. The supply of the chemical elements is key to their contribution to alleviating these pressures. Most synthetic and radioactive elements are not available in sufficient supply to contribute in this. Some solutions, such as wind turbines, batteries, fuel cells and automotive exhaust remediation pose questions about sustainable supplies of critical elements. With an eye on the target of the IPCC of capping the temperature anomaly to 1.5 oC (RCP2.6), options for carbon capture and storage, and the generation of energy and element supply from the sea are assessed. The consequences of the escape of plastics and pharmaceuticals into the wider environment for water integrity are also considered. This book is designed around providing a one semester course for students who have entered at least the second level of university chemistry. It provides explanations and entries to current environmental issues. For students of environmental science, it provides an understanding of the chemical principles underpinning the causes and possible solutions to these issues. Each chapter has a set appropriate study questions.
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Rao, Ashok. Sustainable Energy Conversion for Electricity and Coproducts: Principles, Technologies, and Equipment. Wiley & Sons, Incorporated, John, 2015.
Buscar texto completoCapítulos de libros sobre el tema "Sustainable energy supplies"
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Hara, Yuji y Kazuaki Tsuchiya. "Feeding Urban Regions: Estimating the Energy Consumption of Domestic Vegetable Supplies for Osaka, Japan". En Science for Sustainable Societies, 141–50. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56445-4_12.
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Jiang, Xiang-lan, Zhi-bin Wu y Yao Yang. "A fuzzy DEMATEL method to analyze the criteria for sustainable supplier selection". En Green Building, Environment, Energy and Civil Engineering, 85–92. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315375106-19.
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Castro, Rui M. G. y J. P. Sucena Paiva. "Pricing the Energy Supplied by Renewable Sources: An Assessment of the Portuguese Situation". En New and Renewable Technologies for Sustainable Development, 145–53. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0296-8_11.
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Mazzà, Guglielmo, Marco Pasini, Silvia Ricci, Matthew Matimbwi y Giampietro Pizzo. "Establishing Local Power Markets and Enabling Financial Access to Solar Photovoltaic Technologies: Experiences in Rural Tanzania". En Energiepolitik und Klimaschutz. Energy Policy and Climate Protection, 263–80. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-38215-5_11.
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AbstractEnergy inclusion is a major concern in Tanzania, where rural areas are widely lacking access to both power networks and off-grid systems. Different barriers are slowing the achievement of Sustainable Development Goal 7: universal electrification in the country raises concerns in delays and equity. Financial exclusion adds to the complexity of adopting appropriate technological solutions, particularly for rural communities. Solar photovoltaic solutions represent an opportunity to increase energy access and enable growth. The introduction of new technological products requires to establish local power markets, including demand, financial resources and providers, supply mechanisms and after-sale services. The financing of renewable energy solutions for rural households partially relies on microfinance institutions and community financial groups. Technology suppliers are also providing financial services to expand access to solar and photovoltaic products, applying models mostly enabled by mobile payment systems. The paper assesses the effects of an initiative implemented in Malinyi and Kilombero districts to support the establishment of local solar power markets. The involvement of Village Community Banks to engage communities and develop sustainable financial schemes is evaluated, together with the complexity of combining awareness raising on technological solutions and financial education. Results of the implementation are presented and discussed evaluating the different ingredients of the established markets.
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Evans, John. "Fire". En Elements of a Sustainable World, 178–234. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198827832.003.0005.
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Approaches towards substituting fossil fuel sources of their products, energy and petrochemicals are elaborated. Synthesis gas (CO/H2) provides an intermediate for reconverting waste (from plastics and biomass) as well as carbon fuels into petrochemicals from methanol to petrol to waxes. Energy sources such as nuclear power and photovoltaic cells are explained. Modes of forming hydrogen and avoiding the release of greenhouse gases to afford a green fuel are explained. Electrochemical methods provide secondary energy sources are alternatives are compared: e.g. by powering transport using fuel cells or batteries. The demands of these technologies on the supplies of key elements like lithium and cobalt are discussed to understand whether developments may or may not be sustainable.
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Evans, John. "Water". En Elements of a Sustainable World, 235–72. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198827832.003.0006.
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The physical properties of water provide a framework for many day-to-day experiences: including the energy intrinsic to the melting and boiling of water, and in the increase in vapour density with temperature. The availability of freshwater is sequestered mainly in ice caps and groundwater and most readily acquired water emanates from the rainwater that falls on land. The demands of water for processing (Virtual water) are substantial. Extension fo water supply by desalination of seawater by reverse osmosis is explained. Options for extraction of minerals from seawater are also developed. The challenges posed by heavy elements, pharmaceuticals and plastics on wastewater treatment and drinking water supplies are elaborated
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Pasqualetti, Martin J. "Geopolitics". En The Thread of Energy, 212–45. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780199394807.003.0008.
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Using examples from Crimea, Sudan, the Arctic Ocean, the Persian Gulf, Venezuela, and China, Chapter 8 argues that energy is the most common root cause of political instability. The chapter focuses an intense light on the importance of energy to political decisions as it incorporates the geopolitics of energy into the prospective transition to a more sustainable energy future. It discusses the logic behind the Strategic Petroleum Reserve, both when oil is plentiful and when oil imports are necessary. The geopolitics of energy can lead to war, as it did in the Persian Gulf and as it might trigger in the South China Sea. Chapter 8 explains the role of energy as a motivation for war and continued military engagement. It also describes how concerns about securing sufficient oil supplies have diminished the influence of embargoes as a geopolitical tool.
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Lee, Ooi Beng, Thein Chung Ket, Yew Chun Keat y A. Rashid A. Aziz. "Applications of Vibration-Based Energy Harvesting (VEH) Devices". En Renewable and Alternative Energy, 989–1014. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1671-2.ch031.
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This chapter reviews present usage of vibration-based energy harvesting (VEH) devices and applications. The evolution of energy resources and advance in electronic technologies has resulting the need of self-sustainable wireless/portable electronic devices in current modern society. Batteries are non-beneficial in the miniaturization process of electronic designing and alternative power supplies are desperately needed to fill in the falling behind technologies gap to drive the advance of the wireless/portable development further. VEH mechanism is suggested in this chapter as the solution for the bottleneck. Various consideration of creating an optimal vibration energy harvester are suggested through an analytical model of a mechanical transducer. Useful applications and usages of VEH are presented and some suggestion for improvement are also given. Lastly, the trend of energy harvesting is annotated and commented in-line with the demand of electronic sensors market.
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Baum, Fran. "Creating an Ecologically Sustainable World to Support Environmental and Human Health". En Governing for Health, 123–40. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190258948.003.0008.
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This chapter explains the impact of environmental threats on human health, considers the urgency for action in a context of disputed politics, argues the need for an ecosystems perspective, and assesses policy action in the areas of global warming (climate change), renewable energy, sustainable food and water, and the need for humans to reconnect to nature and land. It argues that the earth’s ecosystem is greatly threatened by human activity and that industrialization has ravaged the natural environment to the point that soon it may no longer support human life. Consequently, the case is made for radical change toward an ecosystems view to maintain a safe operating space for humanity. The importance of renewable energy, sustainable food and water supplies, restoring nature, and protecting biodiversity are seen as vital to human health.
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Hallur, Sudhakar, Roopa Kulkarni, Prashant P. Patavardhan y Vishweshkumar Aithal. "Integration Strategies, Challenges, and Merits of Renewable Resources in Electric Vehicles". En Electric Vehicles and the Future of Energy Efficient Transportation, 75–103. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7626-7.ch004.
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A non-sustainable wellspring of energy is for the most part non-plentiful in nature and can be utilized until they exist in plenitude. As and when the acknowledgment of the decrease of the bountiful assets and natural risks hit, an auxiliary idea of use of non-pollutable-sustainable power sources shows up into place. Different vulnerabilities as for the plan and supplies of a vehicle emerge with less or weakened association of the sustainable assets. A few vulnerabilities will emerge from the capital venture part and extents from the general population and private segments. Another challenge is the contribution of the innovation to travel the flow ordinary vehicles to electrical vehicles (EV) and to coordinate the renewable energy sources (RES), for example, wind-vitality, sunlight-based photovoltaics, and differing assortments of bio-energies to constantly work according to the prerequisite to reduce greenhouse gas (GHG). This chapter deals with the integration and charging challenges and strategies, coordination of vehicles, demand integration, and solutions to them.
Actas de conferencias sobre el tema "Sustainable energy supplies"
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Bhatia, Deepika, Manisha Bhatti y Sheetal. "Sustainable energy as power supplies at our houses". En ADVANCEMENTS IN CIVIL ENGINEERING: COSMEC-2021. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0120670.
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Rajani, G. N. "Emerging trends in Uninterrupted Power Supplies: Patents view". En 2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE). IEEE, 2016. http://dx.doi.org/10.1109/pestse.2016.7516515.
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Kumar, Saurabh, Tejprakash Verma, Ankita Dwivedi y R. K. Srivastava. "Fabrication and comparison of linear power supplies for low-moderate voltage applications". En 2014 Power and Energy Systems Conference: Towards Sustainable Energy (PESTSE). IEEE, 2014. http://dx.doi.org/10.1109/pestse.2014.6805312.
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Loh, P. C., Y. Tang, F. Blaabjerg y P. Wang. "Performance evaluation of time-delay control schemes for uninterruptible power supplies". En 2008 IEEE International Conference on Sustainable Energy Technologies (ICSET). IEEE, 2008. http://dx.doi.org/10.1109/icset.2008.4747133.
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Piper, Leigh y Sumedha Rajakaruna. "Comparison of performance of diesel and fuel cell based submarine power supplies". En 2010 IEEE International Conference on Sustainable Energy Technologies (ICSET). IEEE, 2010. http://dx.doi.org/10.1109/icset.2010.5684460.
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Hawley, John y Manthos Economou. "Trends in energy efficiency regulations and initiatives for consumer external power supplies". En 2010 IEEE International Symposium on Sustainable Systems and Technology (ISSST). IEEE, 2010. http://dx.doi.org/10.1109/issst.2010.5507733.
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Melton, Lyndel W. y Jim Heitzman. "Sustainable Water Supply Development with Use of Brackish Supplies and Carbon Neutral Energy". En World Environmental and Water Resources Congress 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41114(371)420.
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Sheldon, Seth y Ory Zik. "Water Scarcity: An Energy Problem". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88241.
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Using the connection between water and energy as a case study, we present a model that uses the effects of geospatial and temporal context on embedded energy to approximate resource sustainability for water. First, the basic steps of calculating the energy intensity for a given location are discussed. Intensity is presented in units of energy per volume of water. In the case of supplying fresh water, energy intensity depends upon the quality of the original resource, its location relative to the end use location, and the type of technology in use to move and treat the water. Pumping, and conveyance, purification, distribution, wastewater treatment, and system inefficiencies (e.g. evaporative losses, leaks) increase the total energy investment, while water recycling decreases the total investment. Lift and purification are typically the greatest contributors to the overall energy intensity of a fresh water supply, but system inefficiencies can have a substantial impact as well. Over time, growing cities tend to progress from using their least energy intensive water resources (e.g. untreated surface water) to their most energy intensive (e.g. long distance transfers, desalinated water lifted to high elevations) as water demands begin to outstrip supplies. As a function of water availability, we assign each location an intensity value that approaches the intensity of its next “best” (i.e., least energy intensive) source of water. Hence, an area which is depleting its available surface and groundwater may have desalinated surface or groundwater as its next (and last) resort. The area would be characterized as undergoing water stress, and relatively less sustainable than areas which use their local fresh water supplies with no perceivable negative impact. An operating principle of this research is that with enough energy, it is possible to supply any location with fresh water. Desalinated ocean water, moved over long distances and lifted to great heights represents that upper limit. Working backwards from this extreme scenario, it is possible to not only move away from the paradigm of unitless or vague sustainability indices, but to quantify resource scarcity in a way that is both intuitive and actionable. The model is also self-correcting: areas may reduce the energy intensity of a sustainable water supply through better management of existing fresh water resources or through technological innovations that produce fresh water from degraded sources in an energy efficient manner. A major conclusion of this research is that the amount of energy necessary to maintain a reliable supply of fresh water greatly varies by location and technology choice. Further, many areas of the country overuse their local fresh water sources. To create a durable water supply, such areas can 1) reduce their use of local fresh water to sustainable levels and invest in alternative water sources—at a high financial and energy cost, or 2) aggressively pursue water efficiency measures so that they can both reduce their reliance on local fresh water sources and avoid the high costs associated with alternative water supplies. Additionally, by converting water use to energy consumption as a function of scarcity, it is possible to weigh the relative importance of water use efficiency to conservation in other areas (e.g. electricity, direct heating, waste disposal).
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Short, T. D. y R. Oldach. "Solar Powered Water Pumps: The Past, the Present — and the Future?" En ASME Solar 2002: International Solar Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/sed2002-1058.
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Solar (photovoltaic) powered water pumps could be a real instrument for the alleviation of water related deaths and illnesses in developing countries through the provision of clean water. However, despite the benefits that access to sustainable potable water supplies can bring, solar powered water pumps have a long way to go before they even begin to meet the needs of those who could use them. This paper addresses some of the complex, inter-related social and technical issues that have prevented solar powered water pumping from reaching its full potential and shows how future efforts should be directed in order to respond to these issues.
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Kreider, Jan F. y Peter S. Curtiss. "Comprehensive Evaluation of Impacts From Potential, Future Automotive Fuel Replacements". En ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36234.
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In modern society, everything from transportation to commerce to food supply is heavily dependent on the availability of cheap and plentiful energy supplies. In the past few years many have realized that the traditional sources of energy — oil and gas — are in limited supply and that we need to prepare for the approaching production maxima. It is in the interest of national economic security to investigate alternative sources of transportation energy before the extraction of existing supplies becomes prohibitively expensive. This meta-study investigates a number of potential fuels and their sources, including: • agricultural solutions - ethanol (corn and cellulosic), • agricultural solutions - biodiesel, • unconventional refining techniques such as coal-to-liquid, • oil shale retorting and tar sand processing, • traditional petroleum sources. The concentration in the current study is on transportation needs, although it is recognized that building space conditioning and electricity consumption are also significant demands for energy. The results are reported for land use, water use, input-to-output energy ratio, and carbon emissions for each fuel cycle and source. Data are given for the cases of 10, 25, and 50 percent displacements of the 2012 predicted transportation energy needs (i.e., the equivalent of 430 million gallons of gasoline per day). Cradle to grave findings indicate that some novel fuels cannot substitute for conventional fuels without consuming more water or land and emitting more greenhouse gases than fuels in use today. The most sustainable direction for the US transportation fuels sector is suggested.
Informes sobre el tema "Sustainable energy supplies"
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Petit, Vincent. Road to a rapid transition to sustainable energy security in Europe. Schneider Electric Sustainability Research Institute, octubre de 2022. http://dx.doi.org/10.58284/se.sri.bcap9655.
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Decarbonization and energy security in Europe are two faces of the same coin. They are both related to the large dependency of the European Union economy on fossil fuels, which today represent around 70% of the total supply of energy. The bulk of these energy resources are imported, with Russia being the largest supplier, accounting for 40% of natural gas and 27% of oil imports. However, fossil fuels are also the primary root cause of greenhouse gas emissions, and the European Union is committed to reduce those by 55% by 2030 (versus 1990). This report is based on the landmark research from the Joint Research Center of the European Commission, the “Integrated Database of the European Energy Sector”, which for the first time mapped actual energy uses for each country within the European Union, across 17 sectors of activity, with data granularity at the level of each process step (or end-use) of each of these sectors. Our approach here has been to systematically review these process steps (or end-uses) and qualify the extent to which they could be electrified, effectively removing the demand for fossil fuels as a result. We have focused only on those process steps where technology was already widely available and for which we evaluated the switch to be relatively easy (or attractive). In other words, we estimated the impact of rapid electrification of “easy to abate” activities. The conclusion of this evaluation is that the share of electricity demand in the final energy mix could jump from around 20% today to 50%, which would drive a reduction in emissions at end-use of around 1,300 MtCO2 /y, as well as a drop in natural gas and oil supply of around 50%. As a result of such transformation, electricity demand would nearly double, with the bulk of that growth materializing in the building sector. Short-term, the challenge of addressing climate targets while providing for energy security is thus intimately connected to buildings. While such transition would certainly require major infrastructure upgrades, which may prove a roadblock to rapid deployment, we find that the combination of energy efficiency measures (notably digital) and distributed generation penetration (rooftop solar) could significantly tame the issue, and hence help accelerate the move away from fossil fuels, with energy spend savings as high as 80% across some building types; a major driver of change. Beyond this, further potential exists for electrification. Other measures on the demand-side will include deeper renovations of the industrial stock (notably in the automotive, machinery, paper, and petrochemical industries for which our current assessment may be underestimated) and further electrification of mobility (trucks). The transition of the power system away from coal (and ultimately natural gas) will then also play a key role, followed ultimately by feedstocks substitution in industry. Some of these transitions are already on the way and will likely bring further improvements. The key message, however, is that a significant opportunity revolves around buildings to both quickly decarbonize and reduce energy dependencies in Europe. Rapid transformation of the energy system may be more feasible than we think. We notably estimate that, by 2030, an ambitious and focused effort could help displace 15% to 25% of natural gas and oil supply and reduce emissions by around 500 MtCO2 /y (note that these savings would come on top of additional measures regarding energy efficiency and flexibility, which are not the object of this study). For this to happen, approximately 100 million buildings will need renovating, and a similar number of electric vehicles would need to hit the road.