Academic literature on the topic 'Renewable energy not elsewhere classified'
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Journal articles on the topic "Renewable energy not elsewhere classified"
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Bisio, G. "Exergy Analysis of Thermal Energy Storage With Specific Remarks on the Variation of the Environmental Temperature." Journal of Solar Energy Engineering 118, no. 2 (May 1, 1996): 81–88. http://dx.doi.org/10.1115/1.2848020.
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Energy storage is a key technology for many purposes and in particular for air conditioning plants and a successful exploitation of solar energy. Thermal storage devices are usually classified as either variable temperature (“sensible heat”) or constant temperature (“latent heat”) devices. For both models a basic question is to determine the efficiency suitably: Only exergy efficiency appears a proper way. The aim of this paper is to examine exergy efficiency in both variable and constant temperature systems. From a general statement of exergy efficiency by the present author, two types of actual definitions are proposed, depending on the fact that the exergy of the fluid leaving the thermal storage during the charge phase can be either totally lost or utilized elsewhere. In addition, specific remarks are made about the exergy of a system in a periodically varying temperature environment.
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Stefanelli, Robert D., Chad Walker, Derek Kornelsen, Diana Lewis, Debbie H. Martin, Jeff Masuda, Chantelle A. M. Richmond, Emily Root, Hannah Tait Neufeld, and Heather Castleden. "Renewable energy and energy autonomy: how Indigenous peoples in Canada are shaping an energy future." Environmental Reviews 27, no. 1 (March 2019): 95–105. http://dx.doi.org/10.1139/er-2018-0024.
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In 2015, the Liberal Party of Canada formed a majority federal government on a platform that included prioritizing Nation-to-Nation relationships with Indigenous (First Nations, Inuit, and Métis) peoples in the country and re-asserting global leadership in climate change action by moving away from fossil-fuel based extraction and toward renewable energy initiatives. It may be argued that addressing both of these issues, advancing Indigenous–Settler reconciliation, and mitigating climate change, can be done in the same space. Indeed, though Indigenous peoples in Canada and elsewhere have recently moved forward with renewable energy initiatives within their Territories, there has been very little critical analysis on just how such projects have been operationalized and whether renewable energy can or even should be considered a vehicle for reconciliation efforts. In this paper, we present a systematic review of Canadian literature (spanning from 1980 to 2017) concerning Indigenous peoples’ involvement in renewable energy to better understand the stated motivations and desires of Indigenous peoples in Canada taking leadership, partnering in, and (or) participating in the renewable energy sector. Using a series of keyword search strings across three academic databases, two theses databases, and a grey literature search, we retrieved literature (n = 980) that was subjected to four exclusionary forms and then thematically analyzed the included literature (n = 26). Our findings suggest Indigenous peoples’ experiences and motivations are varied, yet many are developing renewable energy in their Territories to: break free of colonial ties, move towards energy autonomy, establish more reliable energy systems, and reap the long-term financial benefits that clean energy can provide. Despite the apparent advantages seen throughout most of the literature reviewed here, we suggest further research in this area is necessary before this kind of positive rhetoric of renewable energy in Indigenous communities builds enough momentum that proponents become blind to possible shortcomings. We conclude with a broader discussion of the interactions between Indigenous–Settler reconciliation in the context of renewable energy projects as well as offering indicators for future research to fill current knowledge gaps.
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Smith, Roy, and Rachel Welton. "Islands in the energy stream: regional cooperation in the Indian Ocean tourism sector." Central European Review of Economics and Management 4, no. 1 (March 15, 2020): 27–52. http://dx.doi.org/10.29015/cerem.831.
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Aim: This article considers the need to move away from a dependency on fossil fuels towards more sustainable renewable sources of energy production. The focus is on the tourism sector in two Indian Ocean destinations, Mauritius and the Seychelles. The broader aim, however, is to highlight the interconnectedness between public and private stakeholders and how lessons learned from these case studies could have broader applicability elsewhere.
Design/research methods: A case study approach has been taken drawing on data supplied by both the private tourism sector in the destinations under consideration and relevant government and regional reports.
Conclusions/findings: Progress has been made in the shift towards decarbonisation policies and practices in these destinations. This has been achieved via a cooperative approach between public and private stakeholders, extending the development of renewable energy infrastructure and supply to include sustainable education policies supported by both governments’ education departments and vocational programmes implemented by the larger hotels in these destinations.
Originality/value of the article: Although there have been other studies conducted on the promotion of renewable energy in small island states, there is a paucity of such research looking specifically at the tourism sector and the role of public/private partnerships in developing broader education for sustainable development programmes.
Implications: The case studies focus on highlighting how governments and tourism businesses can work towards shared goals, in this case decarbonisation and education for sustainability. The implication is that such a model could be applied elsewhere with equally positive results.
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Wolsink, Maarten. "Framing in Renewable Energy Policies: A Glossary." Energies 13, no. 11 (June 4, 2020): 2871. http://dx.doi.org/10.3390/en13112871.
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The transformation of a power supply, a social-technical system suffering from a heavy lock-ins, requires structural adaptations which are extremely complex. All actors in social acceptance processes have either strong vested interests in the current system or are challenging these. In strategies developed by those actors, so-called ‘frames’ play a key role. These are biased problem definitions and mental shortcuts, tools to affect the course of decision-making processes. Examples are “clean coal”, “smart grid”, “base-load”, or “decentralized”. Framing is fundamental to political processes, including those of decision making on renewables. This review presents a glossary of significant frames used in social acceptance processes of renewables’ innovation in power supply systems. The identified frames are classified and presented with, in each entry, one significant frame discussed and analyzed in relation to its most associated frames. Overall, the contrast comes to the fore between the paradigm of the current heavy centralized and hierarchically managed power supply system, on the one hand, and the newly emerging concepts around distributed generation on the other hand. Within these two clusters and in between, certain frames are focused on issues of ownership and control of infrastructures, while others concern allocation of space for establishing infrastructure.
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Li, Yangluxi, and Lei Chen. "Investigation of European modular façade system utilizing renewable energy." International Journal of Low-Carbon Technologies 17 (2022): 279–99. http://dx.doi.org/10.1093/ijlct/ctab101.
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Abstract The purpose of this investigation is to summarize modular façade construction using renewable energy features in different aspects. Researches done so far primarily focusing on building envelop have shown various constructions of building enclosure without energy usage. This paper mainly focuses on modular façade renovation system programmes of European Horizon 2020 [34] and IEA ECBCS Annex 50 Prefabricated Systems for Low Energy Renovation of Residential Buildings in terms of construction, material, installation and thermal performance. Four aspects of construction, material, installation and thermal performance are adopted to evaluate these practices. Related website, paper and report from European commission constitute the database providing for review. Final results illustrate that all modular façade systems mentioned above could be classified into three layers: interior; module and exterior layer, taking charge of disparate functions. Both insulation and energy usage achieve the innovative envelop constructions manufacture. Integrating the renewable energy resources utilization technique into insulated building façade system is the core of this innovative projects achievement.
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Nirmal, Swati, and Tanu Rizvi. "A Review of Renewable Energy Systems for Industrial Applications." International Journal for Research in Applied Science and Engineering Technology 10, no. 9 (September 30, 2022): 1740–45. http://dx.doi.org/10.22214/ijraset.2022.46903.
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Abstract: Integrated renewable energy systems have numerous advantages and benefits compared to conventional energy systems, such as decentralized energy production, environmental impact reduction, and better energy security. Renewable energy systems can be classified under various categories: solar, wind, hydroelectric, biomass, geothermal, and ocean. The integration of these renewable energy resources can bring sustainable solutions and multiple products. The case studies signify the potential integration options of renewable energy systems including energy storage. Non-conventional renewable energy sources and systems (RESS) including but not limited to biomass, biogas, geothermal etc are increasingly playing an important role for electric power distribution and storage. The idea is to develop a resilient energy infrastructure minimizing the cost of remote power and support green and sustainable development efforts. Smart Grids use digital technologies and IOT solutions to intelligently react and adapt to changes in the Grid. Siemens Accelerator for Grids portfolio is the key to exploit the data in the grid. This allows operators to make grid operation more flexible, cost-efficient, more reliable, maintainable, safer and therefore, feasible.
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Ruddat, Michael. "Public acceptance of wind energy – concepts, empirical drivers and some open questions." Wind Energy Science 7, no. 4 (August 11, 2022): 1679–91. http://dx.doi.org/10.5194/wes-7-1679-2022.
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Abstract. The further development of wind energy is of major importance for the success of the energy system transformation in Germany and elsewhere. This transition process is not an easy task. For example, the yearly installed capacity of wind energy onshore in Germany has been declining since 2017. Only relatively few new wind turbines were constructed especially in 2019. Problems are, for example, minimum distance requirements (e.g. residential areas, air safety), the high complexity of planning processes and local protests. Social science research has now dealt with the topic of public wind energy acceptance for quite some time. On the one hand, the specific kind of acceptance (e.g. local acceptance) has been subject to scientific discourse. On the other hand, different empirical drivers (e.g. perceived distributional or procedural fairness, trust in relevant actors of the transformation process, risk–benefit perceptions, participation) have been of special interest. This review deals with central definitions and concepts, as well as qualitative and quantitative empirical findings, of social science research concerning the acceptance of wind energy in Germany and elsewhere. Although there has been already a lot of valuable scientific work done, there are still some open questions left.
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Chou, Cheng-Chih, and Liang-Rui Chen. "An Analysis of Behavioral Models Relating to Renewable Energy in Taiwan." Sustainability 13, no. 13 (June 29, 2021): 7296. http://dx.doi.org/10.3390/su13137296.
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This study sought to understand the behaviors and attitudes of people in Taiwan as they relate to the government’s RE policies by analyzing data from a questionnaire-based telephone survey conducted between 2013 and 2015. Demographic attributes in people’s behavioral models were analyzed for two variables: attention and support. Based on the findings, people’s behavioral models relating to RE were classified into five categories: key promotional group, promotional seed group, support-strengthening group, attention-strengthening group, and non-key promotional group. The attributes of these five segments were also analyzed and their corresponding promotional strategies were formulated. The overarching goal was to improve precision in marketing RE policies to various target groups in order to maximize impact.
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Perane, Pranit B., Swapnil S. Loni, Sanjana U. Chavan, and H. D. Aiwale. "Zero Energy Building." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 172–76. http://dx.doi.org/10.22214/ijraset.2022.42129.
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Abstract: Decarbonizing the building sector is extremely important to mitigating climate change as the sector contributes 40% of the overall energy consumption and 36% of the total greenhouse gas emissions in the world. Net-zero energy buildings are one of the promising decarbonization attempts due to their potential of decreasing the use of energy and increasing the total share of renewable energy. To achieve a net-zero energy building, it is necessary to decrease the energy demand by applying efficiency enhancement measures and using renewable energy sources. Net zero energy buildings can be classified into four models (Net-Zero Site Energy buildings, Net Zero Emissions buildings, Net-Zero Source Energy buildings, and Net-Zero Cost Energy buildings). A variety of technical, financial, and environmental factors should be considered during the decision-making process of net-zero energy building development, justifying the use of multi-criteria decision analysis methods for the design of net-zero energy buildings. This paper also discussed the contributions of renewable energy generation (hydropower, wind energy, solar, heat pumps, and bioenergy) to the development of net-zero energy buildings and reviewed its role in tackling the decarbonization challenge. Costbenefit analysis and life cycle assessment of net-zero energy building designs and their challenges were reviewed to shape the priorities of future development. It is important to develop a universal decision instrument for optimum design and operation of net-zero energy buildings Keywords: Zero Energy Building, Energy Efficiency, Greenhouse gases, Renewable Energy, Grid
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Gan, Jiatian, Jingli Li, Wannian Qi, Aynur Kurban, Yi He, and Su Guo. "A Review on Capacity Optimization of Hybrid Renewable Power System with Energy Storage." E3S Web of Conferences 118 (2019): 02055. http://dx.doi.org/10.1051/e3sconf/201911802055.
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With the rapid development of the global economy, there is a sharp shortage of fossil energy sources. Therefore the development of renewable energy technologies such as wind power and solar power has become a hot issue nowadays. However, due to the randomness, intermittency and instability of renewable energy, it is difficult to provide continuous and stable electricity when it runs independently. Hybrid renewable power systems with energy storage can improve the reliability of power supply. Capacity optimization is the key of hybrid renewable power system design and the basis of optimal scheduling. In this paper, the capacity optimization of hybrid renewable power system with energy storage is summarized and classified. According to the different energy storage modes of the hybrid renewable power systems, the capacity optimization models, optimization methods and the software used are introduced.
Dissertations / Theses on the topic "Renewable energy not elsewhere classified"
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Hsu, Emma. "A Dirty Renewable: How Trash Incineration Became Classified as Renewable Energy." Scholarship @ Claremont, 2020. https://scholarship.claremont.edu/pomona_theses/218.
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Burning trash should not be considered “renewable energy.” However, the federal government and as many as twenty-three states classify waste-to-energy recovery (WTE), or the incineration of garbage, as a renewable energy source that is eligible for a host of financial incentives. This paper discusses how WTE qualifies as an energy source that can be included in a state’s Renewable Portfolio Standard (RPS), or regulations that require energy producers to source a specific percentage of energy production from renewable energy sources, claiming the same benefits as cleaner, more sustainable energy sources such as solar, wind, and geothermal power. Upon evaluating incentives and programs for which WTE is eligible, I will argue that WTE is neither an environmentally nor economically viable energy solution. By analyzing WTE policy in the state of Maryland, I examine how RPSs contribute to the longevity of this unsustainable practice, calling for an elimination of WTE from RPS policy and federal incentive programs.
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Jarahnejad, Mariam, and Ali Zaidi. "Exploring the Potential of Renewable Energy in Telecommunications Industry." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231344.
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Renewable energy sources have started to substitute traditional energy sources in power sector, heating/cooling sector, and transportation sector. This paper explores the potential of renewable energy (mainly solar and wind) in Information and Communication Technologies (ICT) industry. The focus is on mobile telecommunication infrastructure segment, since it is a prime consumer of energy within the ICT industry. Moving towards solar or wind power sources might bring a major shift in the ICT industry – both on the technological level as well as the service provisioning level. An overview of innovative technological solutions for solar/wind powered telecom networks is provided with a discussion on technological feasibility of innovative standalone solar/wind powered base stations. The market value of these innovative solutions as well as potential power savings are estimated in the total addressable market, the potential market, and the real market. The industry attractiveness of the innovation solutions is assessed using the Porter’s five forces and SWOT frameworks. Furthermore, these innovative solutions are assessed for their potential diffusion likelihood in different scenarios. There are several potential driving forces for the transformation towards solar/wind powered telecom networks. Based on the most important driving forces, plausible scenarios of the future have been identified and analyzed. It is identified that the renewable energy driven transformation in the ICT industry can affect developments in other industries such as automotive, agriculture, healthcare, and transportation industries.
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Thakore, Renuka. "A strategic engagement model for delivering energy efficiency initiatives in the English housing sector." Thesis, University of Central Lancashire, 2016. http://clok.uclan.ac.uk/18647/.
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Housing sectors have particular significance and impact on resource use, deployment and sustainability. Given this, they are inextricably enmeshed in a raft of conjoined issues, ranging from energy, production and consumption, through to effective governance structures and leveraged sustainable transformations. However, the real challenges facing the Housing sectors rest with the supportive societal structures which underpin the operationalisation of these issues. This includes such factors as consultation and engagement, and the identification of critical drivers and proven solutions – which are tangible barriers for sustainable transformations (particularly in the English housing system). This research presents a conceptual model – STRIDES (Strategic Tri-level Relational Interventions for Delivering Energy efficiency and Sustainability), which purposefully addresses the aforementioned barriers, and critically challenges thinking and engagement. STRIDES explicitly captures 5-INs, which embodies interrelated essential conditions needed for successful transformation. This conceptual model was developed using a mixed-method approach, engaging constructivism/interpretivism to guide the development and augmentation of this (to ensure maximum relevance and impact). The English housing system was used as the primary lens – which helped both shape and inform the research methodological approach. STRIDES was developed through: an online survey questionnaire (for systems-knowledge); Delphi questionnaires (for target-knowledge); and focus group discussions (for transformative-knowledge). The theoretical constructs and methods revealed exclusive hidden dialogue of composite correlated multi-perspective stakeholders, which highlighted tri-level influences on interdependent system-components for effective governance of sustainable transformations. Recognising and prioritising relationally responsive emerging strategies arising from STRIDES help stakeholders appreciate subtle nuances and forces across and beyond contexts. This helps positioning, especially to shape/tailor strategic interventions to deliver meaningful objectives of these sustainable transformations.
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Taliotis, Constantinos. "Large scale renewable energy deployment - Insights offered by long-term energy models from selected case studies." Doctoral thesis, KTH, Energisystemanalys, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207364.
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The United Nations’ Sustainable Development Goal 7 (SDG7) of Agenda 2030 calls for an increase in the use of renewable energy sources, among other targets. The percentage of fossil fuel-fired thermal generation for electricity is increasingly being reduced as renewable energy technologies (RET) advance in cost-competitiveness, and as greenhouse gas and industrial air pollutant emission limits become more stringent. In certain cases, renewable energy contributes to energy security by improving a nation’s trade balance, since local resources are harnessed and imports are reduced. RET investments are becoming more frequent gaining a sizeable share in the electric power mix of numerous countries. However, RET is affected by existing fossil fuel-fired electricity generation, especially in countries that have domestic reserves. While coal may be dirty, others such as natural gas provide multiple benefits, presenting a challenge to renewables. Additionally, RET endowment varies for each geographical location. This often does not correspond to the location of major electricity demand centers. Therefore, large scale RET adoption and integration becomes logistically more cumbersome, as it necessitates existence of a developed grid network. Utilizing a series of analyses in two different settings – Africa and Cyprus – this thesis draws insights on RET growth policy and the level of technology representation in long term energy models. In order to capture specific challenges of RET integration, enhancements in traditional long-term energy system models are called for and carried out. The case of Africa is used to assess adoption of RET under various trade scenarios. It is home to some of the world’s greatest RET resource potential and the single largest potential RET project, Grand Inga. While, the island of Cyprus has goals of introducing large percentages of RET into its electric power mix. Each have important idiosyncrasies which are reflected in the analysis. On the one hand, natural gas competes with RET in Cyprus and forms a key transition fuel away from oil. On the other hand, lack of cross-border interconnectors limit RET project development across Africa.QC 20170519
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Azabany, Azad. "Economic analysis and environmental impact of energy usage in microbusinesses in UK and Kurdistan, Iraq." Thesis, University of Central Lancashire, 2014. http://clok.uclan.ac.uk/20475/.
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Over reliance on fossil fuels, rising global population, industrialization, demands for a higher standard of living and transportation have caused alarming damage to the environment. If current trend continues then catastrophic damage to the earth and its environment may not be reversible. There is an urgent need to reduce the use of fossils fuels and substituting it with renewable energy sources such as wind, tidal and hydroelectric. Solar source seems to be the most promising due to its environmental friendly nature, portability and reliability. This source was examined in terms of microbusinesses such as SMEs including hair dressing salon, education centre, fried chicken outlet and printing shop. Small businesses account for a large proportion of the economy. The analysis developed could be applied to small business to show their contribution to the carbon footprint and how this could be reduced using solar energy. The proportions of their current electricity usage that could be substituted with solar cells were calculated. Combined these have a significant impact. These businesses were considered for UK and Iraq with the former being more amenable to solar energy implementation. Analysis of the four SMEs showed that the most energy intensive business was fried chicken take away using a large amount of electricity and the least energy intensive business was the education centre. In the latter in UK 57% of the electricity usage could be replaced by solar energy compared to Kurdistan, which generated a surplus energy that could be fed into the national grid. The gents groom hairdressing and blue apple businesses gave intermediate figures. Parallel conclusions were drawn regarding CO2 emissions released into the atmosphere with education centre being the most environmentally friendly and the fried chicken the least. In addition, a larger public space, an international airport data was analysed and the value of solar replacement demonstrated. The methodology and data analysis approach used may be implemented for other business units and larger public spaces such as hospitals, shopping complexes and football stadiums.
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Engberg, Niklas, and Jesper Jolma. "Overcoming barriers to sustainable product-service systems for non-assembled products : A case study within the renewable energy industry." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74463.
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Purpose – The purpose of this study is to increase knowledge regarding sustainable product-service systems (SPSS) barriers and solutions for non-assembled products. To answer this purpose, we developed the following research questions: (1) what barriers do providers face when utilizing SPSS in a non-assembled product context and (2) what solutions can be used to overcome these barriers? Method – This study was conducted as an abductive case study within SPSS in the renewable energy industry. We interviewed a total of 20 respondents from 16 different companies operating in China, Cyprus, and Sweden. Each respondent was chosen based on their experience and knowledge within the area. Findings – The findings are summarized in a framework that links the identified barriers with specific solutions. In brief, finding stakeholders for large and long-term investments was identified as a major barrier while educating stakeholders was suggested as a common solution. Theoretical and practical implications – The results disqualify two of the barriers in the existing literature while suggesting that varying market conditions is a new barrier. Furthermore, the study provides new insights to the existing literature and presents a framework that managers can use to matchmake SPSS-barriers with solutions. Limitations and future research – The study is limited to a case study focused on barriers and solutions for SPSS-providers. As a result, future research is suggested to validate the findings in another context and among other stakeholders.
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(8088254), Ze Wang. "Radiative Passive Cooling for Concentrated Photovoltaics." Thesis, 2019.
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Photovoltaic (PV) cells have become an increasingly ubiquitous technology; however, concentrating photovoltaics (CPV), despite their higher theoretical efficiencies and lower costs, have seen much more limited adoption. Recent literature indicates that thermal management is a key challenge in CPV systems. If not addressed, it can negatively impact efficiency and reliability (lifetime). Traditional cooling methods for CPV use heat sinks, forced air convection or liquid cooling, which can induce an extremely large convection area, or parasite electric consumption. In addition, the moving parts in cooling system usually result in a shorter life time and higher expense for maintenance. Therefore, there is a need for an improved cooling technology that enables significant improvement in CPV systems. As a passive and compact cooling mechanism, radiative cooling utilizes the transparency window of the atmosphere in the long wavelength infrared. It enables direct heat exchange between objects on earth’s surface with outer space. Since radiated power is proportional to the difference of the fourth powers of the temperatures of PV and ambient, significantly greater cooling powers can be realized at high temperatures, compared with convection and conduction. These qualities make radiative cooling a promising method for thermal management of CPV. In this work, experiments show that a temperature drop of 36 degree C have been achieved by radiative cooling, which results in an increase of 0.8 V for open-circuit voltage of GaSb solar cell. The corresponding simulations also reveal the physics behind radiative cooling and give a thorough analysis of the cooling performance.
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(6611708), John A. Biechele-Speziale. "THE EFFECT OF WATER MOLECULES ON HEADGROUP ORIENTATION AND SELF-ASSEMBLY PROPERTIES OF NON-COVALENTLY TEMPLATED PHOSPHOLIPIDS." Thesis, 2019.
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Simulations of various hydration levels of lamellar phase 23:2 Diyne PC were performed, and subsequent, serial docking simulations of a tyrosine monomer were replicated for each system in both hydrated and dehydrated states.The goal was to evaluate how hydration impacts self-assembly and crystallization on the surface, and
whether or not these simulations, when run sequentially, could determine the answer. It was discovered that hydrated and dehydrated surfaces behave differently, and that
headgroup orientation plays a role in the initial docking and self-assembly process of the tyrosine monomer. It was also determined that potential energy as a sole metric
for determining whether or not a specific conformation of intermolecular orientation is not entirely useful, and docking scores are likely useful metrics in discriminating between conformations with identical potential energy values.
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(7041383), Carl J. Olthoff. "Computation of Large Displacement Stability Metrics in DC Power Systems." Thesis, 2019.
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Due to the instabilities that may occur in dc power systems with regulated power electronic loads such as those used in aircraft, ships, as well as terrestrial vehicles, many analysis techniques and design methodologies have been developed to ensure stable operation following small disturbances starting from normal operating conditions. However, these techniques do not necessarily guarantee large-displacement
stability following major disturbances such as faults, regenerative operation, pulsed loads, and/or loss of generating capacity. In this thesis, a formal mathematical definition of large-displacement stability is described and the analytical conditions needed to guarantee large-displacement stability are investigated for a notional dc power system. It is shown possible to guarantee large-displacement stability for any piecewise continuous value of load power provided it is bounded by the peak rating of the dc source.
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(9581096), Olatunji T. Fulani. "A Heterogeneous Multirate Simulation Approach for Wide-bandgap-based Electric Drive Systems." Thesis, 2021.
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Recent developments in semiconductor device technology have seen the advent of wide-bandgap (WBG) based devices that enable operation at high switching frequencies. These devices, such as silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs), are becoming a favored choice in inverters for electric drive systems because of their lower switching losses and higher allowable operating temperature. However, the fast switching of such devices implies increased voltage edge rates (high dv/dt) that give rise to various undesirable effects including large common-mode currents, electromagnetic interference, transient overvoltages, insulation failure due to the overvoltages, and bearing failures due to
microarcs. With increased use of these devices in transportation and industrial applications, it is imperative that accurate models and efficient simulation tools, which can predict these high-frequency effects and accompanying system losses, be established. This research initially focuses on establishing an accurate wideband model of a surface-mount permanent-magnet
ac machine supplied by a WBG-based inverter. A new multirate simulation framework for predicting the transient behavior and estimating the power losses is then set forth. In this approach,
the wideband model is separated into high- and low-frequency models implemented using two different computer programs that are best suited for the respective time scales. Repetitive execution of the high-frequency model yields look-up tables for the switching losses in the semiconductors, electric machine, and interconnecting cable. These look-up tables are then incorporated into the low-frequency model that establishes the conduction
losses. This method is applied to a WBG-based electric drive comprised of a SiC inverter and permanent-magnet ac machine. Comparisons of measured and simulated transients are provided.
Book chapters on the topic "Renewable energy not elsewhere classified"
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Hammed, T. B., and M. K. C. Sridhar. "Green Technology Approaches to Solid Waste Management in the Developing Economies." In African Handbook of Climate Change Adaptation, 1–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42091-8_174-1.
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AbstractThe severity of extreme weather and climate change impacts around the world has been a public health concern in the last few decades. Apart from greenhouse gas generation, poor waste management exacerbates consequences of global warming such as flooding, lower crop yields, and the epidemic of diseases which can escalate into disastrous situations. The general public in developing economies sees wastes as valueless materials and disposes them through open burning, stream dumping, or as conveniently as possible. Also, the cutting of trees for firewood leads to deforestation and desertification that increase people’s vulnerability to climate change impact. Against this backdrop, there is a need for a paradigm shift toward developing indigenous technologies that convert solid waste to cheap and clean energy. Various innovations use the “green technology approach” in putting trash back into the value chain. Furthermore, the green technology approach has a great potential to enhance adaptation and resilience among climate change-displaced populations where they can set up microenterprise on useful end products. In this chapter, unique features of these technologies at the Renewable Resources Centre of the University of Ibadan, practice-oriented researches, and a case study at Kube-Atenda community Ibadan, Nigeria, are presented. This chapter is therefore set out to showcase examples of waste management initiatives and strategies that have been successfully implemented elsewhere by the authors. It also focuses on how some countries in the continent, with developing economies, may foster their resilience and their capacity to adapt to climate change.
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Hammed, T. B., and M. K. C. Sridhar. "Green Technology Approaches to Solid Waste Management in the Developing Economies." In African Handbook of Climate Change Adaptation, 1293–312. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_174.
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AbstractThe severity of extreme weather and climate change impacts around the world has been a public health concern in the last few decades. Apart from greenhouse gas generation, poor waste management exacerbates consequences of global warming such as flooding, lower crop yields, and the epidemic of diseases which can escalate into disastrous situations. The general public in developing economies sees wastes as valueless materials and disposes them through open burning, stream dumping, or as conveniently as possible. Also, the cutting of trees for firewood leads to deforestation and desertification that increase people’s vulnerability to climate change impact. Against this backdrop, there is a need for a paradigm shift toward developing indigenous technologies that convert solid waste to cheap and clean energy. Various innovations use the “green technology approach” in putting trash back into the value chain. Furthermore, the green technology approach has a great potential to enhance adaptation and resilience among climate change-displaced populations where they can set up microenterprise on useful end products. In this chapter, unique features of these technologies at the Renewable Resources Centre of the University of Ibadan, practice-oriented researches, and a case study at Kube-Atenda community Ibadan, Nigeria, are presented. This chapter is therefore set out to showcase examples of waste management initiatives and strategies that have been successfully implemented elsewhere by the authors. It also focuses on how some countries in the continent, with developing economies, may foster their resilience and their capacity to adapt to climate change.
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"Appendix C ReferencesReferences for Case Studies (In Addition to Sources Listed Elsewhere)." In READy: Renewable Energy Action on Deployment, 211–25. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-12-405519-3.16001-3.
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Obayya, Salah, Nihal Fayez Fahmy Areed, Mohamed Farhat O. Hameed, and Mohamed Hussein Abdelrazik. "Optical Nano-Antennas for Energy Harvesting." In Renewable and Alternative Energy, 161–96. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1671-2.ch006.
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The solar energy is able to supply humanity energy for almost another 1 billion years. Optical nano-antennas (ONAs) are an attractive technology for high efficiency, and low-cost solar cells. These devices can be classified to semiconductor nano-wires and metallic nano-antenna. Extensive studies have been carried out on ONAs to investigate their ability to harvest solar energy. Inspired by these studies, the scope of the chapter is to highlight the latest designs of the two main types of ONAs. The metallic nano-antennas are discussed based on the following points: plasmon, modeling, and performance of antenna designs using different configurations and materials. Moreover, the semiconductor nano-wires are studied thoroughly in terms of photonic crystals, antenna design with different patterns, nano-wire forms and materials. Also, the applications of ONAs and their fabrication aspects such as diode challenges are presented in detail. Finally, three novel designs of ONAs are presented and numerically simulated to maximize the harvesting efficiency.
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Alma, M. Hakkı, and Tufan Salan. "Alternative Fuels." In Energy: Concepts and Applications, 327–446. Turkish Academy of Sciences, 2022. http://dx.doi.org/10.53478/tuba.978-625-8352-00-9.ch06.
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Nowadays, a wide range of value-added fine chemicals, alternative biofuels and eco-friendly polymeric materials can be produced from lignocellulosic biomass sources via thermochemical, biological or catalytic routes in the biorefinery. For the sustainable production of biofuels, abundant, easy accessible and renewable biomass-based feedstock has an important key role to replace petroleum oil in the production of liquid hydrocarbon fuels for the transportation sector with a zero carbon footprint. The biofuel can be defined as the solid, liquid, or gaseous fuels which are predominantly obtained from these biomass based raw materials. However, thepre-treatment, production and purification processes differ greatly based on the feedstock type, used technology and desired fuel type. Thus, to eliminate the contradiction in terms, biofuels are classified from first to fourth generation at the present time. This chapter review the several liquid biofuel type along with production methods, technologies and feedstock types based on that generation classification.
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Sánchez, Caio G., Renata Andrade Figueiredo, Flávio Augusto Bueno Figueiredo, Elisabete Maria Saraiva Sánchez, Jesús Arauzo, Alberto Gonzalo Callejo, and Rolando Zanzi Vigouroux. "Liquid Products Characterization from Pyrolysis and Gasification." In Innovative Solutions in Fluid-Particle Systems and Renewable Energy Management, 167–98. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8711-0.ch006.
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In this chapter there is described a tentative of obtain and characterize pyrolysis liquids from cashew nut shell, using a suggested classification of tars. The large amount of tar definitions and measurement methods, as well as the wide spectrum of organic compounds, makes it almost impossible to capture “tars” with a clear definition. And so, in order to facilitate the study of the evolution of liquid fraction composition, the compounds have been grouped according to their chemical nature, but differently from other works, it was extended the range of compounds in order to evaluate the influence of the reactor parameters in liquid fraction compositions. It is described, as well, the pyrolysis and gasification of cashew nut shell, that has been studied in a laboratory scale reactor. It was quantified and classified the production of liquids (tar) and evaluated the final temperature influence (800, 900 and 1000 °C) and the use of N2 in pyrolysis case, and a mixture of N2 and steam or air in the gasification case. Finally, it is described the identification and quantification of tar compositions, by CG-MS and CG-FID analyzes. Around 50 different compounds have been detected in the liquid fraction obtained, most of them being present at very low concentrations and it is observed that in the pyrolysis and gasification processes, phenol and benzene were the major chemical groups, and this fact agree with others works, presented here in a bibliographic revision.
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McElroy, Michael B. "Power from the Sun Abundant But Expensive." In Energy and Climate. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190490331.003.0015.
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As discussed in the preceding chapter, wind resources available from nonforested, nonurban, land-based environments in the United States are more than sufficient to meet present and projected future US demand for electricity. Wind resources are comparably abundant elsewhere. As indicated in Table 10.2, a combination of onshore and offshore wind could accommodate prospective demand for electricity for all of the countries classified as top- 10 emitters of CO2. Solar energy reaching the Earth’s surface averages about 200 W m– 2 (Fig. 4.1). If this power source could be converted to electricity with an efficiency of 20%, as little as 0.1% of the land area of the United States (3% of the area of Arizona) could supply the bulk of US demand for electricity. As discussed later in this chapter, the potential source of power from the sun is significant even for sun- deprived countries such as Germany. Wind and solar energy provide potentially complementary sources of electricity in the sense that when the supply from one is low, there is a good chance that it may be offset by a higher contribution from the other. Winds blow strongest typically at night and in winter. The potential supply of energy from the sun, in contrast, is highest during the day and in summer. The source from the sun is better matched thus than wind to respond to the seasonal pattern of demand for electricity, at least for the United States (as indicated in Fig. 10.5).There are two approaches available to convert energy from the sun to electricity. The first involves using photovoltaic (PV) cells, devices in which absorption of radiation results directly in production of electricity. The second is less direct. It requires solar energy to be captured and deployed first to produce heat, with the heat used subsequently to generate steam, the steam applied then to drive a turbine. The sequence in this case is similar to that used to generate electricity in conventional coal, oil, natural gas, and nuclear- powered systems. The difference is that the energy source is light from the sun rather than a carbon- based fossil fuel or fissionable uranium.
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Belay, Tefaye. "Micro-Grid Planning and Resilience Within Bulk System Planning and Operation." In Research Anthology on Smart Grid and Microgrid Development, 217–32. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3666-0.ch011.
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Micro grid is widely used in real worlds for advanced forecasting and demand response of renewable energy source, grid integration, and operations. Micro grid consists of conventional and nonconventional energy source such as wind energy, solar energy, biomass energy, hydro power, diesel power, fuel cell, geothermal power, thermal power, etc. Micro grid is a combination of AC power and DC power such as wind, solar, fuel cell, biomass, and Hydro power, which is mostly used in micro grids. Grid can be operated by grid connected mode or islanding modes. Micro grid is classified into traditional micro grids and smart micro grids.
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Belay, Tefaye. "Micro-Grid Planning and Resilience Within Bulk System Planning and Operation." In Handbook of Research on New Solutions and Technologies in Electrical Distribution Networks, 232–47. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1230-2.ch013.
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Micro grid is widely used in real worlds for advanced forecasting and demand response of renewable energy source, grid integration, and operations. Micro grid consists of conventional and nonconventional energy source such as wind energy, solar energy, biomass energy, hydro power, diesel power, fuel cell, geothermal power, thermal power, etc. Micro grid is a combination of AC power and DC power such as wind, solar, fuel cell, biomass, and Hydro power, which is mostly used in micro grids. Grid can be operated by grid connected mode or islanding modes. Micro grid is classified into traditional micro grids and smart micro grids.
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Majeed Ahmed, Luma. "Bulk and Nanocatalysts Applications in Advanced Oxidation Processes." In Oxidoreductase [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94234.
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Advanced oxidation processes (AOPs) are considered to be vital methods for treating the contaminations produced mainly by the human activations. In present-day, UV light or solar light, bulk and nano- photocatalysts are often used to enhance this technology by creating the highly reactive species such as the hydroxyl radicals. Extreme hydroxyl radical is considered as a key to start the photoreaction. Photoreaction is widely used in treatment of Lab and industrial contaminations, preparation of compounds and produced the renewable energy, so it’s classified as green technique. In order to improve the efficiency of this reaction with fabrication the surface of the used photocatalyst such as metal doped, sensitized and produced a composite as bulk catalyst or nano catalyst.
Conference papers on the topic "Renewable energy not elsewhere classified"
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Stillwell, Ashlynn S., and Michael E. Webber. "Feasibility of Wind Power for Brackish Groundwater Desalination: A Case Study of the Energy-Water Nexus in Texas." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90158.
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With dwindling water supplies and the impacts of climate change, many cities are turning to water sources previously considered unusable. One such source for inland cities is brackish groundwater. With prolonged drought throughout Texas, cities such as El Paso, Lubbock, and San Antonio are desalinating brackish groundwater to supplement existing water sources. Similar projects are under consideration elsewhere in Texas. While brackish groundwater contains fewer total dissolved solids than seawater, desalination of brackish groundwater is still an energy-intensive process. Brackish water desalination using reverse osmosis, the most common desalination membrane treatment process, consumes 20 to 40 times more energy than traditional surface water treatment using local water sources. This additional energy consumption leads to increased carbon emissions when using fossil fuel-generated electricity. As a result of concern over greenhouse gas emissions from additional energy consumption, some desalination plants are powered by wind-generated electricity. West Texas is a prime area for desalination of brackish groundwater using wind power, since both wind and brackish groundwater resources are abundant in the area. Most of the Texas Panhandle and Plains region has wind resource potential classified as Class 3 or higher. Additionally, brackish groundwater is found at depths less than 150 m in most of west Texas. This combination of wind and brackish groundwater resources presents opportunities for the production of alternative drinking water supplies without severe carbon emissions. Additionally, since membrane treatment is not required to operate continuously, desalination matches well with variable wind power. Implementing a brackish groundwater desalination project using wind-generated electricity requires economic feasibility, in addition to the geographic availability of the two resources. Using capital and operating cost data for wind turbines and desalination membranes, we conducted a thermoeconomic analysis for three parameters: 1) transmission and transport, 2) geographic proximity, and 3) aquifer volume. Our first parameter analyzes the cost effectiveness of tradeoffs between building infrastructure to transmit wind-generated electricity to the desalination facility versus pipelines to transport brackish groundwater to the wind turbines. Secondly, we estimate the maximum distance between the wind turbines and brackish groundwater at which desalination using wind power remains economically feasible. Finally, we estimate the minimum available brackish aquifer volume necessary to make such a project profitable. Our analysis illustrates a potential drinking water option for Texas (and other parts of the world with similar conditions) using renewable energy to treat previously unusable water. Harnessing these two resources in an economically efficient manner may help reduce future strain on the energy-water nexus.
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Millrath, Karsten, and Nickolas J. Themelis. "Waste as a Renewable Source of Energy: Current and Future Practices." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55258.
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Municipal Solid Waste (MSW) has been recognized by several states as a renewable source of energy. Worldwide, about 130 million tons of MSW are combusted annually in waste-to-energy facilities that produce electricity and steam for district heating and also recover metals for recycling. While being linked to environmental pollution prior to the implementation of Maximum Available Control Technology (MACT) regulations, Waste-to-Energy (WTE) was recently named one of the cleanest sources of energy by the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy (DOE). However, the WTE industry often faces resistance and preconceptions based on past experience rather than current performance. Due to economic considerations that do not include environmental benefits, most of the U.S. MSW still ends up in landfills despite the fact that for every ton of MSW landfilled greenhouse gas emissions increase by at least 1.2 tons of carbon dioxide. While implemented research and development strategies focused on emissions, there is still a tremendous need for more efficient yet durable combustion technologies including flue gas recirculation and oxygen enrichment, environmentally and economically competitive reuse options for WTE residues, and also public education. The importance of WTE in the universal effort for sustainable development and its need for research and development resources has led to the formation of the Waste-to-Energy Research and Technology Council. Its principal goal is to improve the economic and environmental performance of technologies that can be used to recover materials and energy from solid wastes. This paper provides an overview of the current worldwide WTE practices, predominant technologies, and current research for advancing WTE as a renewable source of energy in the U.S. and elsewhere.
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Friedman, Barry, Lori Bird, and Galen Barbose. "Energy Savings Certificate Markets: Opportunities and Implementation Barriers." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90036.
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Early experiences with energy savings certificates (ESCs) have revealed their merits and the challenges associated with them. While in the United States ESC markets have yet to gain significant traction, lessons can be drawn from early experiences in the states of Connecticut and New York, as well as from established markets in Italy, France, and elsewhere. The staying power of European examples demonstrates that ESCs can help initiate more efficiency projects. This article compares ESCs with renewable energy certificates (RECs), looks at the unique opportunities and challenges they present, and reviews solutions and best practices demonstrated by early ESC markets. Three major potential ESC market types are also reviewed: compliance, voluntary, and carbon. Additionally, factors that will benefit ESC markets in the United States are examined: new state EEPS policies, public interest in tools to mitigate climate change, and the growing interest in a voluntary market for ESCs.
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Reynolds, Anthony, Philip R. LeGoy, and Aidan Sweeney. "Waste to Energy Strategy and Approach for Ireland." In 10th Annual North American Waste-to-Energy Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/nawtec10-1009.
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Waste to Energy (WTE) is a viable and vital resource to Ireland. Due to its geographic location, strategically located between the U.S. and Europe, Ireland has inherent advantages when it comes to gaining technical knowledge. As an island country with its size it has exaggerated waste elimination problems. Power generation in Ireland is distorted by the size of the island and Irelands recent high-tech business boom has had an affect too. These two items, power and waste, overlap and can be addressed (in part) with one solution. Products not produced in Ireland are imported. The residue of these products is garbage. Therefore the garbage is constantly being imported to the island and never expelled. Landfill space in Ireland is diminishing — rapidly. “Not in my backyard!” is a principal attitude of the public and with good reason. Refuse is a health threat. Landfill tax legislation is changing and the price is rising to €19/tonne and heading for €32/tonne. Converting waste to energy as part of a recycling process garnishes public support because the resource of rubbish is managed in a manner that appeals to common sense. It is a solution that takes into account the public health and providence of the island. If waste is sorted and classified as economically recyclable (i.e. marketable) it is reclaimed and reused. If waste is sorted and classified as economically un-recyclable by conventional methods it is then evaluated for its energy value in power generation and thermal conversion to basic elemental products. The classification process determines the value of waste products, therefore the economic implications of their use either by recycling the waste and thermally eliminating it while generating electricity and/or by producing recycled products. This paper presents a waste recycling/generation project concept that includes waste stream separation, refuse-derived fuels, waste gasification/generation and renewable power resource integration.
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Leighty, William C. "Running the World on Renewables: Hydrogen Transmission Pipelines With Firming Geologic Storage." In ASME 2008 Power Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/power2008-60031.
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The world’s richest renewable energy resources — of large geographic extent and high intensity — are stranded: far from end-users with inadequate or nonexistent gathering and transmission systems to deliver the energy. The energy output of most renewables varies greatly, at time scales of seconds to seasons: the energy capture assets thus operate at inherently low capacity factor (CF); energy delivery to end-users is not “firm”. New electric transmission systems, or fractions thereof, dedicated to renewables, will suffer the same low CF, and represent substantial stranded capital assets, which increases the cost of delivered renewable-source energy. Electric energy storage cannot affordably firm large renewables at annual scale. At gigawatt (GW = 1,000 MW) scale, renewable-source electricity from diverse sources, worldwide, can be converted to hydrogen and oxygen, via high-pressure-output electrolyzers, with the hydrogen pipelined to load centers (cities, refineries, chemical plants) for use as vehicle fuel, combined-heat-and-power generation on the retail side of the customers’ meters, ammonia production, and petroleum refinery feedstock. The oxygen byproduct may be sold to adjacent dry biomass and / or coal gasification plants. Figures 1–3. New, large, solution-mined salt caverns in the southern Great Plains, and probably elsewhere in the world, may economically store enough energy as compressed gaseous hydrogen (GH2) to “firm” renewables at annual scale, adding great market and strategic value to diverse, stranded, rich, renewable resources. Figures 2 and 3. For example, Great Plains, USA, wind energy, if fully harvested and “firmed” and transmitted to markets, could supply the entire energy consumption of USA. If gathered, transmitted, and delivered as hydrogen, about 15,000 new solution-mined salt caverns, of ∼8 million cubic feet (225,000 cubic meters) each, would be required, at an incremental capital cost to the generation-transmission system of ∼5%. We report the results of several studies of the technical and economic feasibility of large-scale renewables — hydrogen systems. Windplants are the lowest-cost new renewable energy sources; we focus on wind, although concentrating solar power (CSP) is probably synergistic and will become attractive in cost. The largest and richest renewable resources in North America, with high average annual windspeed and sunlight, are stranded in the Great Plains: extant electric transmission capacity is insignificant relative to the resource potential. Large, new, electric transmission systems will be costly, difficult to site and permit, and may be difficult to finance, because of public opposition, uncertainties about transmission cost recovery, and inherently low CF in renewables service. The industrial gas companies’ decades of success and safety in operating thousands of km of GH2 pipelines worldwide is encouraging, but these are relatively short, small-diameter pipelines, and operating at low and constant pressure: not subject to the technical demands of renewables-hydrogen service (RHS), nor to the economic challenge of delivering low-volumetric-energy-density GH2 over hundreds or thousands of km to compete with other hydrogen sources at the destination. The salt cavern storage industry is also mature; several GH2 storage caverns have been in service for over twenty years; construction and operating and maintenance (O&M) costs are well understood; O&M costs are low.
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Cerri, Giovanni, Claudio Corgnale, and Coriolano Salvini. "Liquid H2 Storage for Small Size Solar Power Plants." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68038.
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Many significant features lead to consider hydrogen as an interesting energy carrier. Hydrogen can be burned with pure oxygen thus the production of CO2 and NOx is avoided. Since molecular hydrogen does not exist on the earth it has to be produced from fossil fuels or from renewable energy sources. Energy from fossil fuels can be transferred into hydrogen and released elsewhere. So relevant reduction of emission of pollutant can be achieved in critical zones at the centres of large cities. Nevertheless the losses occurring during production, distribution and storage of hydrogen lead to an increased consumption of the primary energy source (fossil fuels) and to increased emission levels (CO2 and others). Hydrogen can be obtained from renewable sources such as the solar energy and used in situ for power generation. In this case hydrogen can act as an energy carrier which allows a local energy storage. In such a way the time dependent availability of the solar energy and the production level of the power plant can be decoupled. In a distributed generation context a small size solar power plant equipped with a hydrogen storage system has been studied. Different storage options have been investigated and compared. Finally a liquid hydrogen storage system is proposed. The peculiarities of the selected system allow a reduction of losses, size of machinery and energy requirements. The paper presents an analysis of the more relevant issues related to the different hydrogen storage options suitable for the present application. After the characterization of the solar field in terms of energy availability and the specifications of both the hydrogen production system and the power generation unit, the design of a liquid hydrogen storage system is presented and widely discussed. This method is particularly useful in the plants management (for example nuclear or coal plants), where it’s impossible or very difficult to modify power level, as well. So, such a static system would be useful in order to allow power modulation by H2 plant. In order to do this, a research for individuating high volumic (and mass) specific capacity systems should be driven.
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Singh, Manan, and Ryan Sharston. "Direct Air Capture Technology: An Investigation of Net Carbon Impacts." In 2020 ACSA Fall Conference. ACSA Press, 2020. http://dx.doi.org/10.35483/acsa.aia.fallintercarbon.20.17.
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In recent years, Direct Air Capture (DAC) has been emerging as a promising negative emission technology, primarily due to its flexibility of location and capability to absorb CO2, generated from non-localized sources. This study evaluates the two variants of DAC i.e. DAC-1 utilizing liquid solvents and DAC-2 using solid sorbents, in terms of overall emissions generated as a result of the process of CO2 removal from atmosphere. It was found that majority of overall emissions generated during the life cycle of DAC, may be attributed to the operational phase. The operational emissions were then classified into three major steps i.e. CO2 capture, CO2 separation and compression. The impact of the choice of energy source on generated emissions was then analyzed in the cases of both DAC-1 and DAC-2, separately for the three classifications. Both the variants were found to be reasonably efficient in terms of net CO2 removed from atmosphere, provided the energy requirements are sourced from renewable energy resources. Additionally, we analyzed the secondary impacts in terms of land use requirements and water loss during the process.
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Wei, Yan, Penghua Guo, Ben Xu, Thomas Rodriguez, Luis Escobar, and Hermes Chirino. "A Theoretical Study of Saline Droplet Evaporation in Solar-Thermal Driven Full Separation Multi Effect Distillation (FS-MED) System." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69508.
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The significant changes of population, environment and climate have led to the increased need for freshwater. However, the shortage of naturally available freshwater is becoming more frequent than ever. Desalination, removal of salt and other minerals from seawater, brackish water, and wastewater, is a promising solution to provide the increasing need of freshwater. Multi stage flashing (MSF) and multi effect distillation (MED) can be classified as conventional thermal-driven desalination technologies. Nevertheless, the disposal of high concentrated brine is a big environmental concern. Despite the tremendous improvements in conventional desalination technology, the desalination process is very energy consuming. Due to high expenses of the conventional energy resources, renewable energy sources can provide alternatives. Considering the fact that Concentrated Solar Power (CSP) has been significantly developed during the past two decades, inorganic salts are the perfect candidates as Heat Transfer Fluid (HTF) for high temperature applications in solar thermal energy storage, fully separating water and salts in the desalination process arises naturally, since the leftover salts can be collected instead of disposing them to the environment. A full separation multi effect distillation (FSMED) system was proposed by other researchers, where the air fed to the full separation tank (FST) is preheated by a heat source, and the highly concentrated brine from the last effect is sprayed in the FST, so that the brine droplets can be completely evaporated by leaving behind inorganic salts. Obviously, the full separation process of salts and water involves multiphase heat and mass transfer. However, a key question is the characterization of the lifetime of brine droplets inside the FST during its entire evaporation process, and the effects from the internal circulation to droplet evaporation. If the droplet has strong internal circulation, the definition of two stages of evaporation becomes inaccurate, it has to be corrected based on the detailed calculation of time scale at each stage. In the current study, a 1D quasi-steady evaporation model was developed to characterize the effects from internal circulation to the life cycle of droplets in the FST, compared with the results using the dynamic evaporation model. To simplify the analysis, water droplet with impurity particles was considered, and a case study was also provided to compare the life cycle of water droplets without internal circulation. Finally, a correction to the definition of two-stage of water droplet evaporation was provided. It is expected that the computation results will be beneficial for thermal driven desalination community.
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Kremensas, Arūnas, Agnė Kairytė Kairytė, Saulius Vaitkus, Sigitas Vėjelis, Giedrius Balčiūnas, Anna Strąkowska, and Sylwia Członka. "Mechanical performance of biodegradable hemp shivs and corn starch-based biocomposite boards." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.132.
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For the production of traditional building materials, excavated natural resources are used. The production process of such materials requires high-energy demands, wherefore, high amounts of CO2 gases, which have a great impact on climate change, are emitted. Only a small part of such materials is effectively recycled and reused. Generally, they are transported to landfills, which rapidly expand and may pollute the soil, groundwater and air. Currently, a great attention is paid to the production of novel building materials. The aim is to use as less excavated materials as possible and replace them by natural renewable resources. Therefore, the recycling and utilisation at the end of life cycle of such materials would be easier and generation of waste would reduce. This way, the efforts of switching to circular economy are being put. One of the approaches – wider application of vegetable-based raw materials (cultivated and uncultivated agricultural plants). The usage of fibre hemp shives (HS) as an aggregate and corn stach (CS) as a binding material allows development of biocomposite boards (WPCs) which could contribute to the solution of the before mentioned problems. Bio-sourced materials combined with a polymer matrix offer an interesting alternative to traditional building materials. To contribute to their wider acceptance and application, an investigation into the use of wood-polymer composite boards is presented. In this study, biocomposite boards for the building industry are reported. WPCa are fabricated using a dry incorporation method of corn starch and HS treatment with water at 100 °C. The amount of CS and the size of the HS fraction are evaluated by means of compressive, bending and tensile strength, as well as microstructure. The results show that the rational amount of CS, independently on HS fraction, is 10 wt.%. The obtained WPCs have compressive stress at 10% of deformation in the range of (2.4–3.0) MPa, bending of (4.4–6.3) MPa and tensile strength of (0.23– 0.45) MPa. Additionally, the microstructural analysis shows that 10 wt.% of CS forms a sufficient amount of contact zones that strengthen the final product. The obtained average density (~319–408 kg/m3) indicate that, according to European normative document EN 316, WPCs can be classified as softboards and used as self-bearing structural material for building industry. Based on the requirements, WPCs can be applied in dry and humid conditions for the internal and external uses without loading (EN 622-4, section 4.2) or as load-bearing boards in dry and humid conditions for instantaneous or short-term load duration (EN 622-4, section 4.3).