Artykuły w czasopismach: „Self-Sufficiency (energy)”

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Basu, Dipak R., Eileen Marshall, Colin Robinson, Richard Bending i Richard Eden. "The Economics of Energy Self-Sufficiency." Economica 53, nr 211 (sierpień 1986): 413. http://dx.doi.org/10.2307/2554152.

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Todeschi, Valeria, Paolo Marocco, Guglielmina Mutani, Andrea Lanzini i Massimo Santarelli. "Towards Energy Self-consumption and Self-sufficiency in Urban Energy Communities". International Journal of Heat and Technology 39, nr 1 (28.02.2021): 1–11. http://dx.doi.org/10.18280/ijht.390101.

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In Europe, 70% of citizens live in urban areas and consume around 75% of the primary energy supply. In order to reduce the impact of energy consumption and improve the competitiveness of local energy systems, Energy Communities may help to address the challenges of urban sustainability and energy security through local energy production and self-consumption. Solar, biomass and wind are the main sources of renewable energy that are generally used in cities. However, not all the sources available in urban environment are usable, due to the limited availability, or other technical or non-technical limits and constraints. In order to promote renewable energy technologies in buildings it is necessary to consider architectural, cultural, energy, technical and economic feasibility. This work defines a methodology for the optimal design of grid connected PV-battery systems in urban environments. The model was applied to two districts located in the city of Turin with the aim of evaluating the technical feasibility of combining multiple residential users at city level. The purpose of this work is to promote self-consumption and self-sufficiency from the network, using the integration of solar energy with PV-battery systems, and to reduce electrical losses in favor of both the single user and the distribution system. Results show that different values of self-sufficiency and self-consumption can be reached depending on the shape and dimension of each building. It was shown that it is possible to satisfy the current requirements to become an Energy Community in an urban environment with good levels of self-sufficiency.

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Gostomczyk, Waldemar. "POSSIBILITIES TO CREATE AUTONOMOUS ENERGY REGIONS USING RENEWABLE ENERGY RESOURCES". Annals of the Polish Association of Agricultural and Agribusiness Economists XX, nr 3 (28.06.2018): 47–52. http://dx.doi.org/10.5604/01.3001.0012.1493.

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The aim of the study is to analyze the level of energy self-sufficiency at the regional and local level. At the level of voivodships, the production of electricity, its relation to the energy consumed, the volume and dynamics of changes in the production of renewable energy in 2010-2016 and its share in total production are presented. Autonomous energy regions have been characterized as structures allowing to strive for energy self-sufficiency. The tests and analyzes used a comparative method and a breakdown of individual categories according to the analyzed values. As a result of the conducted analyzes, it was found that an important role in achieving energy self-sufficiency will be performed by micro and small installations based on local resources.

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Bantacut, T., i M. Romli. "Development of energy self-sufficiency of agroindustry". IOP Conference Series: Earth and Environmental Science 472 (23.06.2020): 012039. http://dx.doi.org/10.1088/1755-1315/472/1/012039.

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Godement, François. "China's Energy Policy: from Self-sufficiency to Energy Efficiency". International Spectator 42, nr 3 (wrzesień 2007): 391–97. http://dx.doi.org/10.1080/03932720701567596.

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TERIHATI, Enxhi. "Energy security in Albania – towards energy self-sufficiency 2030". Jus & Justicia 18, nr 1 (2024): 130–48. http://dx.doi.org/10.58944/fyyz9729.

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The war between Russia and Ukraine has started to have its biggest effects on the most used products by people around the world. The rise in energy prices has been the main headline of this war. In addition to the conventional regional and global security threats due to Russian aggression against Ukraine, the world is facing the unconventional threat of energy security. The energy produced in Russia is used as the main supplier for the economies of many bordering or non-bordering states, turning this product into a lever used by Russia to fuel its war and into a source of conflict among European allies and beyond. In this context, Albania cannot be immune to the skyrocketing energy prices. On the other hand, seeing Albania’s favorable situation in diversifying the necessary energy for the daily activities of families and businesses in our country, the government has undertaken the initiative to turn Albania into a net energy exporter until 2030. This means that Albania will no longer be so energy-dependent on fluctuations in prices on global stock exchanges, or dependent on the use of temporary regional initiatives such as “Open Balkans” to secure supply from other countries in the region but will become a country that achieves energy self-sufficiency in the coming decade. This work aims to highlight the threat to national security from the energy crisis and to use quantitative and qualitative data to understand whether this initiative is achievable in the years to come. Keywords: energy security, sustainable development, green renewable energy, Western Balkans.

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Ramadhikka, Abhinaya, Ofita Purwani i Sri Yuliani. "Strategi Desain Integrasi Rumah Susun dan Fasilitas Pertanian Perkotaan berbasis Self-sufficiency". ARSITEKTURA 21, nr 2 (6.11.2023): 305. http://dx.doi.org/10.20961/arst.v21i2.72916.

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<p><em>This paper focuses on the implementation of the concept of self-sufficiency in energy and food into residential buildings by adding agricultural facilities. There is still no specific literature on the application of self-sufficiency in residential buildings with urban agricultural facilities. Current literature. The current literature discusses self-suffiency in general, or the application of one aspect of self-suffiency in buildings, such as energy. In addition, the scale of discussion on large-scale self-sufficiency and not specific to residential buildings with urban agricultural facilities Therefore, this article can be one of the literature that discusses self-sufficiency specifically in residential buildings with urban agricultural facilities and on a microscale. Using theories from Mahdi, Magdalenna and Suharyanto , we formulate how to apply the self-sufficiency concept to the residential building by calculating the food and energy needed by the residents and how to achieve it. This project is a model of how to achieve self-sufficiency in residential buildings</em></p>

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Kim, Min-Hwi, Youngsub An, Hong-Jin Joo, Dong-Won Lee i Jae-Ho Yun. "Self-Sufficiency and Energy Savings of Renewable Thermal Energy Systems for an Energy-Sharing Community". Energies 14, nr 14 (15.07.2021): 4284. http://dx.doi.org/10.3390/en14144284.

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Due to increased grid problems caused by renewable energy systems being used to realize zero energy buildings and communities, the importance of energy sharing and self-sufficiency of renewable energy also increased. In this study, the energy performance of an energy-sharing community was investigated to improve its energy efficiency and renewable energy self-sufficiency. For a case study, a smart village was selected via detailed simulation. In this study, the thermal energy for cooling, heating, and domestic hot water was produced by ground source heat pumps, which were integrated with thermal energy storage (TES) with solar energy systems. We observed that the ST system integrated with TES showed higher self-sufficiency with grid interaction than the PV and PVT systems. This was due to the heat pump system being connected to thermal energy storage, which was operated as an energy storage system. Consequently, we also found that the ST system had a lower operating energy, CO2 emissions, and operating costs compared with the PV and PVT systems.

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Kim, Dawon, Yonghae Jang i Yosoon Choi. "Comparative Analysis of Estimated and Actual Power Self-Sufficiency Rates in Energy-Sharing Communities with Solar Power Systems". Energies 16, nr 24 (7.12.2023): 7941. http://dx.doi.org/10.3390/en16247941.

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Amid the ongoing climate crisis, the international community is enacting policies to promote low-carbon energy-sharing communities. The primary objective of such communities is to enhance community-level energy self-sufficiency. Accurate energy self-sufficiency assessments are paramount in planning energy-efficient architectural designs, urban landscapes, and communal environments. In this study, the energy self-sufficiency rate of an energy-sharing community was estimated at the design stage and compared with the actual energy self-sufficiency rate calculated based on data collected over the following year (April 2022 to March 2023). The outcomes reveal that the estimated energy self-sufficiency rate is 171%, whereas the realized rate is 133%, underscoring the disparity between the projections and outcomes. An analysis of the seasonal variations in these discrepancies elucidated a correlation between the differences in the insolation levels between standard typical meteorological year (TMY) data that are conventionally used for energy generation projections and the actual meteorological conditions. Moreover, a notable incongruity surface exists between the monthly average electricity consumption of a standard four-person household, as stipulated by the Korean Electric Power Corporation (KEPCO) at 273 kWh, and the empirical power consumption at 430 kWh, resulting in a variance of approximately 157 kWh. This study illuminates the complex relationship between variables affecting energy self-sufficiency in energy-sharing communities. It serves as a crucial step towards informed decision making and precision in sustainable urban energy solutions.

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YASNOLOB, Ilona, Stanislav BOIKO, Oleg GORB, Oleksandr POMAZ, Oleksii ZORIA, Svitlana PYSARENKO, Alla RUDYCH, Tetiana DIADYK, Viktoriia DANYLENKO i Yuliia KOZACHENKO. "Conceptual Bases of Business Activities' Management Grounded on Sustainable Development and Energy Self-Sufficiency of United Territorial Communities in the Context of the European Green Deal Implementation in Ukraine". Journal of Environmental Management and Tourism 12, nr 7 (1.12.2021): 1838. http://dx.doi.org/10.14505/jemt.v12.7(55).09.

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The idea of developing energy self-sufficiency of the united territorial communities was presented in the article from the standpoint of the European Green Deal implementation in Ukraine, taking into account the national interests. The current situation in Ukraine was analyzed in the article, as well as the promising ways of European integration of Ukraine in the context of the European Green Deal, the conceptual foundations of energy self-sufficiency development in united territorial communities were defined, taking into account the existing and implementing new mechanisms to stimulate energy transformation in communities. The structure of basic components’ interrelation in developing and increasing energy self-sufficiency of the united territorial communities was proved. Peculiarities of the ways of Ukrainian united territorial communities’ development in the context of the European Green Deal implementation were investigated. The concept of the model of functioning of the State Agency of Ukraine on Management of Natural Resources for the requirements of developing energy self-sufficiency of the united territorial communities and practical recommendations on increasing energy self-sufficiency of the united territorial communities were worked out.

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Kettunen, Lauri. "Self-sufficiency of agriculture in Finland in 1970—1983". Agricultural and Food Science 58, nr 4 (1.09.1986): 143–50. http://dx.doi.org/10.23986/afsci.72225.

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This study is aimed at considering self-sufficiency and food security in Finland. Self-sufficiency of final products has been over 100 % for a long period. Only self-sufficiency of fruits and vegetables is below 100 % due to the climate. Self-sufficiency of energy, protein and fat of the diet is also examined in this article. A new indicator of total self-sufficiency is developed by dividing the total yield measured in feed units with the total feed requirement of total human consumption, measured also in feed units. According to these calculations total self-sufficiency has been from 105 % to 130%, depending on the quantity of total yield. Itis difficult to make adequate calculations of self-sufficiency of inputs, since the industry producing agricultural inputs is operating under free trade, and tries to benefit from foreign trade. Imports of energy, raw materials, machines and implements lower self-sufficiency. Some estimates are, however, given in the text. The article also discusses the attempts to improve food security by storage. Agricultural research aims to clarify how alternative cultivation methods could lessen the dependence on imports, and thus improve the food security.

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Zhou, Yuan, Hongcheng Liu, Xing Xiong i Xiaojun Li. "Morphology Optimization of Residential Communities towards Maximizing Energy Self-Sufficiency in the Hot Summer Cold Winter Climate Zone of China". Land 13, nr 3 (6.03.2024): 337. http://dx.doi.org/10.3390/land13030337.

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Further research is needed on the capability of residential communities to achieve energy self-sufficiency under the constraints of current standards of land use, in particular for the Hot Summer and Cold Winter climate zone (HSCW) of China, where the majority of communities are dominated by high floor-area ratios, thus high-rise dwellings, namely less solar potential per unit floor area, while most residents adopt a “part-time, part-space” pattern of intermittent energy use behavior, thus using relatively low energy per unit floor area. This study examines 150 communities in Changsha to identify morphological indicators and develop a prototype model utilizing the Grasshopper platform. Community morphology is simulated and optimized by taking building location, orientation, and number of floors as independent variables and building energy consumption, solar PV generation, and energy self-sufficiency rate as dependent variables. The results reveal that the morphology optimization can achieve a 4.26% decrease in building energy consumption, a 45% increase in PV generation, and a 13.2% enhancement in energy self-sufficiency, with the optimal being 39%. It highlights that energy self-sufficiency cannot be achieved solely through morphology improvements. Moreover, the study underscores the crucial role of community orientation in maximizing energy self-sufficiency, with the south–north orientation identified as the most beneficial. Additionally, a layout characterized by a horizontally closed and staggered pattern and a vertically scattered arrangement emerges as favorable for enhancing energy self-sufficiency. These findings underscore the importance of considering morphological factors, particularly community orientation, in striving towards energy-self-sufficient high-rise residential communities within the HSCW climate zone of China.

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Abdel Galil, Rania. "Sustainability and energy self-sufficiency; overcoming the barriers". Renewable Energy and Sustainable Development 1, nr 2 (31.12.2015): 230. http://dx.doi.org/10.21622/resd.2015.01.2.230.

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Pretzlaf, Jason, Tom Mossinger, Bob Hoffman, Timothy Grillo, Raymond Chau i Richard Pipkin. "Energy Self-Sufficiency at USD Using Fuel Cells". Proceedings of the Water Environment Federation 2009, nr 15 (1.01.2009): 2042–45. http://dx.doi.org/10.2175/193864709793954295.

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Singh, Anirudh. "Biofuels and Fiji’s roadmap to energy self-sufficiency". Biofuels 3, nr 3 (maj 2012): 269–84. http://dx.doi.org/10.4155/bfs.12.21.

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Cho, Choon Young, Wonbin Lee, Byeong Gwan Bhang, Jinho Choi, Sang Hun Lee, Sung Cheol Woo i Hyung Keun Ahn. "Convergence Analysis of Capacities for Photovoltaics and Energy Storage System Considering Energy Self-Sufficiency Rates and Load Patterns of Rural Areas". Applied Sciences 9, nr 24 (6.12.2019): 5323. http://dx.doi.org/10.3390/app9245323.

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This work is a case study of 905 households, to present methods for optimizing the capacity of photovoltaic sytems (PVs)/energy storage systems (ESSs) for household to reach a desired energy self-sufficiency (70% to 90%). In order to calculate the capacity of PV and ESSs that would enhance the energy self-sufficiency of families in rural areas, the solar radiance data of the target area for the last five years and the average monthly power usage in the previous year were collected. Then, households with an average energy consumption of 250 kWh per month were chosen for this research. According to the simulation done using Solar Pro, the optimized capacities of PVs and ESSs are 2.67 kW and 7.15 kW, respectively, in order to achieve 90% energy self-sufficiency. We visualized the change in the optimum capacity of PVs and ESSs for the desired energy self-sufficiency. This study would be the base work for forming a grid-distributed energy network system by expanding the system to a national scale.

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Conway, Arthur. "Self-sufficiency in one country". Energy Policy 15, nr 4 (sierpień 1987): 389–90. http://dx.doi.org/10.1016/0301-4215(87)90031-0.

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Hassan, Qusay, i Marek Jaszczur. "Self-Consumption and Self-Sufficiency Improvement for Photovoltaic System Integrated with Ultra-Supercapacitor". Energies 14, nr 23 (24.11.2021): 7888. http://dx.doi.org/10.3390/en14237888.

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This research study uses a computer simulation based on real input data to examine the impact of a supercapacitor module working as a fast response energy storage unit in renewable energy systems to increase energy self-consumption and self-sufficiency. The evaluated system includes a photovoltaic system with a capacity of 3.0 kWp and between 0 and 5 supercapacitor units with a capacity of 500 F per module. The study was carried out using experimental data for electrical load, solar irradiance, and ambient temperature for the year 2020, with a 1 min temporal resolution. The daily average ambient temperature was 10.7 °C, and the daily average solar irradiance was 3.1 kWh/m2/day. It is assumed that the supercapacitor could only be charged from a photovoltaic system using renewable energy and not from the grid. The simulation results showed that using the supercapacitors to feed the short and large peaks of the electrical load significantly increases energy self-consumption and self-sufficiency. With only five supercapacitor modules, yearly energy self-sufficiency increases from 28.09% to 40.77%.

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Gao, Wei, Mei Zhao i Huihua Li. "Investigation on form and energy use of the rural residences in Beijing and surrounding cold areas under the self-sufficiency perspective". MATEC Web of Conferences 355 (2022): 02072. http://dx.doi.org/10.1051/matecconf/202235502072.

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As a design theory on energy-saving housing, Self-sufficiency house is suited to the environment conditions of cold rural areas in China. Investigation on the rural residence form and energy use is the important foundation to carry out the research and design practice on self-sufficiency house. Taking Beijing and its surrounding rural areas as target, the paper combs current situation and technical requirements of rural residence based on self-sufficiency perspective. After surveying general residential condition and data, it analyzes the form, function, energy use and heating technology of rural residence, which will provide basic data and reference for post-study.

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Khaidir, Usnawiyah, Hendrival, Hafifah, Elvira Sari Dewi, Muhammad Yusuf N i Zurrahmi Wirda. "SORGHUM AS AN BIOENERGY AND FOOD SELF-SUFFICIENCY". Global Science Society: Jurnal Ilmiah Pengabdian Kepada Masyarakat 3, nr 2 (13.07.2021): 151–60. http://dx.doi.org/10.33059/gss.v3i2.3729.

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ABSTRACT Sorghum is a food crop commodity that has important potential as a source of food and renewable energy for food and energy independence during the COVID-19 pandemic. Community service activities regarding processing sorghum into food and energy are very important in dealing with food dependence on rice and fuel energy from crude oil. Through extension activities and training on sorghum processing, it is hoped that it can increase public knowledge about sorghum and its processing. The method used is counseling and training on sorghum processing to the community. Extension and training activities for processing sorghum into alternative food and renewable energy in order to increase community knowledge in Blang Nibong Village, Samudera District, North Aceh Regency have been carried out and can be well received by the community. The community is very enthusiastic about participating in the service activities. The community has knowledge of the processing of sorghum into sorghum flour as an ingredient for processed food products such as steamed brownies, krispi tofu spices, cakes, and nagasari. Partners also have knowledge about other benefits of sorghum, namely as a renewable energy source. Sorghum stalks are known to contain bioethanol as fuel. Programs like this are very important to carry out, especially for people living in rural areas that have the potential for developing sorghum areas so that the program will be sustainable.

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Engelken, Maximilian, Benedikt Römer, Marcus Drescher i Isabell Welpe. "Transforming the energy system: Why municipalities strive for energy self-sufficiency". Energy Policy 98 (listopad 2016): 365–77. http://dx.doi.org/10.1016/j.enpol.2016.07.049.

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Karapidakis, E., S. Apostolakis i N. Vidakis. "An approach of energy self-sufficiency at sports facilities". Journal of Physics: Conference Series 2339, nr 1 (1.09.2022): 012022. http://dx.doi.org/10.1088/1742-6596/2339/1/012022.

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Abstract Sports facilities are special cases of large-scale building complexes that demand large amounts of energy and power. This is due to the specific requirements of the thermal energy and the different kind of several activities that need considerable high load demands in relatively short time. Energy self-sufficiency of a building complex is defined as the ability to fulfil its own energy needs. This paper evaluates the energy consumption of the Olympic Athletic Center of Athens and proposes ways to support and enhance its operation, introducing the self-sufficiency concept, where load demand will be served by energy sources from the internal grid of the sport center, targeting to the highest possible autonomous operation. To achieve the minimum imports from the utility grid, the paper proposes the operation of a CHP unit and the installation of photovoltaics (PV), with the support of battery storage system and the existing gensets of the facility.

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Camprubí, Lino. "Whose self-sufficiency? Energy dependency in Spain from 1939". Energy Policy 125 (luty 2019): 227–34. http://dx.doi.org/10.1016/j.enpol.2018.10.058.

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Nicolini, Elvira. "Energy Self-Sufficiency of Smaller Rural Centers: Experimental Approaches". Buildings 14, nr 6 (19.06.2024): 1862. http://dx.doi.org/10.3390/buildings14061862.

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Inland areas have been affected by demographic and economic decline over the past decades. New economic models, which are more focused on a humane quality of life, encourage a revival of these territories as newer, healthier places for living. This paper focuses on minor centers, rethought as energy communities and how these can sustain themselves and become new places of living. The first part of the research critically analyzes current strategies of SECAPs (Sustainable Energy and Climate Action Plans) in smaller historic urban centers. The second part of the paper starts with the typological, morphological, and technological interscalar analysis of two case studies, testing a repeatable expeditious knowledge collection and an intervention method on them. For urban environments, the hypothesized interventions include the management of energy production from renewable sources that are compatible with the presence and value of urban and built heritage; concerning rural territories, an agro-energy park is proposed. The document aims to provide a repeatable method for planning strategic actions within SECAPs in smaller urban centers with a high historical connotation. The case studies show that energy self-sufficiency can be an opportunity to valorize the urban center while favoring environmental sustainability and local development.

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Unterberger, Eric, Adam Wolf i Gunther Reinhart. "A Comparison of Indicators for Self-Sufficient Energy Systems". Applied Mechanics and Materials 856 (listopad 2016): 11–19. http://dx.doi.org/10.4028/www.scientific.net/amm.856.11.

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Industry is one of the major energy consumers in Germany. In order to fulfil the social responsibility of the energy revolution, companies required to install and to use their own renewable energy. With the increasing set-up of renewable energy systems at the production site, these companies are interested in consuming most of the energy directly on-site. Based on a material flow simulation of the Green Factory Bavaria in Augsburg, this paper compares different indicators for the energy self-sufficiency. Finally the effect of electrical energy storage to increase the energy self-sufficiency is examined.

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Thomasson, Tomi, Kirsikka Kiviranta, Antton Tapani i Matti Tähtinen. "Flexibility from Combined Heat and Power: A Techno-Economic Study for Fully Renewable Åland Islands". Energies 14, nr 19 (8.10.2021): 6423. http://dx.doi.org/10.3390/en14196423.

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As energy systems globally are transitioning into renewable energy, simultaneous targets of high self-sufficiency have led to complex system design proposals. While conventional technology solutions would reduce the complexity in theory, limitations in the potential outcome may exist. To address this dilemma, the work quantified the systemic value provided by a conventional solution; biomass combined heat and power (CHP) production, in terms of economic feasibility, provided flexibility and energy self-sufficiency. The analysis focused on the renewable energy integration of the Åland Islands, where the synergetic island energy system is heavily increasing the wind power capacity. While considering local fuel resource availability, multiple alternative energy system scenarios were constructed. To evaluate the scenarios, the work developed and validated a combined dispatch and investment optimization model. The results showed that the studied conventional approaches limited the achievable self-sufficiency in the power sector (80.6%), however, considerably increasing the value from the present state (18.5%). Second, compared to previous studies, the results indicated a low value from biomass CHP in the wind-based energy system. Instead, the combination of high wind capacity and power-to-heat enabled the best economic feasibility and high self-sufficiency, which could be further improved by lower electricity taxation.

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Sánchez-Jiménez, Jose Luis, Francisco José Muñoz-Rodríguez, Gabino Jiménez-Castillo, Antonio Javier Martinez-Calahorro i Catalina Rus-Casas. "Analysis of Different Scenarios to Include PV Rooftop Systems with Battery Energy Storage Systems in Olive Mills". Energies 17, nr 1 (27.12.2023): 144. http://dx.doi.org/10.3390/en17010144.

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The industrial sector is not the one with the highest energy consumption but, together with, it represents the most, together with the transport sector, the most polluting ones. Photovoltaic Rooftop systems and battery energy storage systems are very strong candidates to include renewable energy, allowing greater grid autonomy and greenhouse gas mitigation. Therefore, this paper aims to outline it will be provided a methodology based on monitored data to analyze the potential of photovoltaic Rooftops with battery energy storage systems regarding self-consumption and self-sufficiency indices in the industrial sector. Direct self-consumption and self-sufficiency indices, either with or without storage, will be analyzed. In addition, the iso self-consumption and iso self-sufficiency curves are used, which allow us to evaluate the matching between the generation and consumption profiles considering either direct self-consumption or the use of batteries. In this sense, a large, medium, and small olive mill were selected in order to cover the entire spectrum of these industries. Olive mills are suitable candidates for the incorporation of photovoltaic systems since generation profiles match the consumption profiles. However, the size of these systems is highly dependent on the period of consumption to be faced. Regarding batteries, both during the harvest and off-harvest periods, the impact on self-sufficiency becomes significant, reaching increases of up to 10%, depending on the battery capacity used.

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Kim, Yeweon, i Ki-Hyung Yu. "Constructing a Database of Reference Hydrothermal Sources for a Zero-Energy Building Certification Rating in South Korea and Analyzing the Renewable Energy Self-Sufficiency Rate Achieved by Water-Source Heat Pumps". Energies 16, nr 1 (3.01.2023): 543. http://dx.doi.org/10.3390/en16010543.

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This study aims to institutionalize an evaluation methodology to assess water-source heat pumps (WSHPs) when designing a zero-energy building. Thus, regions where zero-energy buildings were designed were subdivided into 66 sub-regions, thereby standardizing the temperatures on the source side of WSHPs using river water and pipeline water. Based on these data, ground-source and water-source heat pump system-based simulation (new and renewable energy self-sufficiency rate compared to building energy consumption) values were derived for cases whose condition (region or heat source) was different among the buildings certified as zero-energy buildings. The application of the standard meteorological data and reference hydrothermal data to the ECO2 program and outcome evaluation led to the following findings: in all cases (reference: Seoul), ground-source heat pumps (GSHPs) showed a higher self-sufficiency rate than WSHPs (ground source > pipeline water > river water). The self-sufficiency rate of GSHPs was 11–33% higher than that of WSHPs. In a regional comparison among the cold (Jeongseon), central (Seoul), and southern (Jeju Island) regions, WSHPs exhibited higher energy self-sufficiency rates than GSHPs under the conditions of higher water temperatures in winter and lower water temperatures in summer, as in the southern region.

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Mulyo, Jangkung Handoyo, Sugiyarto Sugiyarto i Arif Wahyu Widada. "KETAHANAN DAN KEMANDIRIAN PANGAN RUMAH TANGGA TANI DAERAH MARGINAL DI KABUPATEN BOJONEGORO". Agro Ekonomi 26, nr 2 (21.12.2016): 121. http://dx.doi.org/10.22146/agroekonomi.17265.

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Food security and food self-sufficiency at household level are much determined by their farm production. Meanwhile, some areas considered as the marginal area are constrained by limited support of natural resources. Thus, many households lived in marginal area will face food insecurity. This study aimed to understand the households’ food security level, both measured by using the Energy Sufficiency Score (AKE) and the Food Expenditure Share (PPP). Furthermore, this study also tries to identify the food self-sufficiency level among rural marginal household in Bojonegoro Regency. The result of study shows that there is a wide disparity among rural household in the food/energy intake, this is shown by the average level of food/energy intake level that is considered high (87%), meanwhile there is 53% of the households categorized as the food insecure household. Based on the Food Expenditure Share level, most of the households are categorized as food secure households. The food self-sufficiency, particularly rice, have been attained.

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Willcox, P. J. "PRINCIPAL ADDRESS: SELF-SUFFICIENCY - STILL A WORTHWHILE GOAL". APPEA Journal 28, nr 2 (1988): 30. http://dx.doi.org/10.1071/aj87039.

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Idrissi Kaitouni, Samir, Mohamed Bakhouya, Mohammed Ahachad i Jamal Brigui. "Comparison Study and Assessment of Thermal Performance and Energy Self-sufficiency of Nearly Zero Energy Building (nZEB) in Two Different Climates". E3S Web of Conferences 433 (2023): 03005. http://dx.doi.org/10.1051/e3sconf/202343303005.

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The paper presents a comparative study of a nearly zero-energy office building with respect to two different cities located in two different climate zones: a humid continental climate with dry winter, represented by the city of Seoul and a hot semi-arid climate, represented by the city of Benguerir. Obviously, climate is one of the most influential factors affecting indoor thermal comfort, energy demand and energy self-sufficiency of nZEBs. In this study, we first assess the impact of regional climate on the thermal performance, and we explore the influence of the local natural energy sources on the Solar BIPV and PV outputs in the two different cities: Benguerir and Seoul, respectively. And then, we explore the overall energy self-sufficiency of the nZEB for the respective climates. The differences in thermal need and energy self-sufficiency responses were statistically significant. With respect to Benguerir, the thermal energy needs for cooling amount to 71.5 kWh/m²/year, with almost no heating thermal needs and the Energy Balance (EB) reaches 0.88. On the other side, these metrics are around 52.56 kWh/m²/year for the total thermal needs with a share of 43% for heating thermal needs and a yearly EB equals to 0.6 for the nZEB in Seoul. Finally, it is important to mention that the BIPV output share out of the total solar energy output amounts to 57% and 61% for the cities of Seoul and Benguerir, respectively, which highlight the important role of BIPV in reaching advanced levels of energy self-sufficiency.

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Simic, Katarina, Klaas Thiers, Hugo Montyne, Jan Desmet i Michel De Paepe. "Numerical assessment of self-sufficiency of residential buildings in Belgium by using heat pumps, photovoltaic panels and energy storages". Journal of Physics: Conference Series 2069, nr 1 (1.11.2021): 012115. http://dx.doi.org/10.1088/1742-6596/2069/1/012115.

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Abstract Residential buildings claim a significant share of the total energy use worldwide. In order to have more realistic energy performance predictions, increased attention is paid to the analysis of the building’s energy use through comprehensive, transient detailed numerical simulations. In this article, the self-consumption and self-sufficiency values of three detached residential buildings are assessed through numerical models made in the programming language Modelica and software tool Dymola. The three buildings have the same structure and different space heating energy demands of 15 kWh/m2year, 30 kWh/m2year and 45 kWh/m2year. The energy use of the buildings coincides with the occupancy profile where domestic hot water use dominates over the space heating demand provided by an air to water heat pump. The discrepancy between renewable energy production and energy consumption is mitigated by means of thermal load shifting and electrical energy storage. In this research, the self-consumption and self-sufficiency of the studied buildings have been analysed as a function of the economically favourable energy storage sizing. For the use of an electrical battery with the installed capacity of 2.5 kWh and thermal energy storage of 250 l, the self-sufficiency results to be 40%, 38.5% and 37% for the three buildings respectively at the specific simulated energy demand conditions.

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Reis, Inês F. G., Ivo Gonçalves, Marta A. R. Lopes i Carlos Henggeler Antunes. "Assessing the Influence of Different Goals in Energy Communities’ Self-Sufficiency—An Optimized Multiagent Approach". Energies 14, nr 4 (13.02.2021): 989. http://dx.doi.org/10.3390/en14040989.

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Understanding to what extent the emergence of prosumers and prosumagers organized in energy communities can impact the organization and operation of power grids has been one of the major recent research avenues at the European level. In renewable-based communities aiming to reach some level of energy self-sufficiency, a key issue to be addressed is assessing how the presence of end-users playing different roles in the system (self-consuming, producing and trading, performing demand management, etc.) can influence the overall system performance. In this setting, this paper combines Distributed Artificial Intelligence and optimization approaches to assess how prosumagers and consumers pursuing different goals can influence the energy self-sufficiency of a local energy community. The residential demand is accurately modeled, and the agents’ preferences are considered in the modeling to represent a smart community. The results show that although energy community members may have conflicting individual goals, the overall system self-sufficiency can be maximized with economic benefits for all stakeholders, thus illustrating the advantages of energy communities.

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Moon, Hyodong, Hyoeun Lee, Boram Kim i Yunsung Kim. "Urban Hydrogen Production Model Using Environmental Infrastructures to Achieve the Net Zero Goal". Energies 15, nr 24 (7.12.2022): 9293. http://dx.doi.org/10.3390/en15249293.

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Land available for energy production is limited in cities owing to high population density. To reach the net zero goal, cities contributing 70% of overall greenhouse gas emissions need to dramatically reduce emissions and increase self-sufficiency in energy production. Environmental infrastructures such as sewage treatment and incineration plants can be used as energy production facilities in cities. This study attempted to examine the effect of using environmental infrastructure such as energy production facilities to contribute toward the carbon neutrality goal through urban energy systems. In particular, since the facilities are suitable for hydrogen supply in cities, the analysis was conducted focusing on the possibility of hydrogen production. First, the current status of energy supply and demand, and additional energy production potential in sewage treatment and incineration plants in Seoul, were analyzed. Then, the role of these environmental infrastructures toward energy self-sufficiency in the urban system was examined. This study confirmed that the facilities can contribute to the city’s energy self-sufficiency and the achievement of its net-zero goal.

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Kong, Xue, Hailin Mu, Hongye Wang, Nan Li i Xiaoyu Liu. "Two-Layer Optimization Method for Sharing Energy Storage and Energy considering Subjectivity". International Journal of Energy Research 2024 (27.04.2024): 1–26. http://dx.doi.org/10.1155/2024/4638185.

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The high level of integration of distributed generation systems (DGSs), especially distributed wind and solar, significantly affects the flexibility and controllability of the power system. Aggregating local DGSs and shared energy storage systems (ESSs) within an energy community offers an economically and environmentally viable solution. However, the coupling of shared ESSs with the energy community, while considering subjectivity, is often overlooked. Therefore, this study introduces a two-layer optimization framework that enables DGSs to trade energy freely, voluntarily, and independently and to share ESSs within the energy community, considering participants’ subjectivity. The upper layer optimizes the size of shared ESSs, while the lower layer, structured as a two-layer model, simulates participant interactions. The numerical case shows that, compared to DGSs operating individually, the shared ESS case indicates that community self-sufficiency and self-consumption rates increase by 16.22% and 21.98%, respectively. Additionally, the annual operating cost is reduced by approximately 27.10%, and CO2 emissions are decreased by about 33.24%. Considering DGS’ subjectivity, the self-sufficiency and self-consumption rates are 3.04% lower, and the total operating costs and CO2 emissions are 3.26% and 6.86% higher, respectively.

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Martínez-Calahorro, Antonio Javier, Gabino Jiménez-Castillo, Catalina Rus-Casas, Pedro Gómez-Vidal i Francisco José Muñoz-Rodríguez. "Photovoltaic Self-Consumption in Industrial Cooling and Refrigeration". Electronics 9, nr 12 (21.12.2020): 2204. http://dx.doi.org/10.3390/electronics9122204.

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The industrial sector has a great opportunity to reduce its energy costs through distributed generation. In this sense, the potential of photovoltaic self-consumption systems in the industrial cooling and refrigeration sector is shown. Two industries with photovoltaic self-consumption installations are shown and the electricity consumption profile of this type of industry which has a remarkable basal electricity consumption during daytime is analyzed. The matching between consumption and photovoltaic generation profiles is provided through the self-consumption and self-sufficiency curves considering different reporting periods (monthly and annual). Moreover, a new index is presented: self-sufficiency index for sunshine hours, φSS,SH. This index evaluates the performance of the photovoltaic self-consumption system when facing the consumption only during sunshine hours. This index may complement the self-sufficiency index and may improve the analysis of this type of systems in the industrial sector. Self-consumption indices of 90% may be provided. Moreover, self-sufficiency indices for total (24 h) and for sunshine hours of 25% and 50%, respectively, for industry A, and 26% and 45% for industry B have been obtained. During daytime, half the load consumption in this type of industry may be covered by photovoltaics while achieving high levels of use of the photovoltaic energy generated.

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Ekici, Berk, Okan F. S. F. Turkcan, Michela Turrin, Ikbal Sevil Sariyildiz i Mehmet Fatih Tasgetiren. "Optimising High-Rise Buildings for Self-Sufficiency in Energy Consumption and Food Production Using Artificial Intelligence: Case of Europoint Complex in Rotterdam". Energies 15, nr 2 (17.01.2022): 660. http://dx.doi.org/10.3390/en15020660.

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The increase in global population, which negatively affects energy consumption, CO2 emissions, and arable land, necessitates designing sustainable habitation alternatives. Self-sufficient high-rise buildings, which integrate (electricity) generation and efficient usage of resources with dense habitation, can be a sustainable solution for future urbanisation. This paper focuses on transforming Europoint Towers in Rotterdam into self-sufficient buildings considering energy consumption and food production (lettuce crops) using artificial intelligence. Design parameters consist of the number of farming floors, shape, and the properties of the proposed façade skin that includes shading devices. Nine thousand samples are collected from various floor levels to predict self-sufficiency criteria using artificial neural networks (ANN). Optimisation problems with 117 decision variables are formulated using 45 ANN models that have very high prediction accuracies. 13 optimisation algorithms are used for an in-detail investigation of self-sufficiency at the building scale, and potential sufficiency at the neighbourhood scale. Results indicate that 100% and 43.7% self-sufficiencies could be reached for lettuce crops and electricity, respectively, for three buildings with 1800 residents. At the neighbourhood scale, lettuce production could be sufficient for 27,000 people with a decrease of self-sufficiency in terms of energy use of up to 11.6%. Consequently, this paper discusses the potentials and the improvements for self-sufficient high-rise buildings.

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38

Gale, S. "The premium for self-sufficiency in liquid fuels". Energy 12, nr 1 (styczeń 1987): 45–52. http://dx.doi.org/10.1016/0360-5442(87)90018-1.

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Leonardi, Salvatore, Giuseppe Marco Tina i Natalia Distefano. "Photovoltaic Roundabouts for Enhancement of Self-Sufficiency and Resiliency". Applied System Innovation 5, nr 3 (29.04.2022): 46. http://dx.doi.org/10.3390/asi5030046.

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Roundabouts have become a common type of intersection design in many countries. The area of the center island can be used to install a photovoltaic system to power local loads such as lighting systems. The objective of this study is to evaluate the degree of self-sufficiency that a roundabout can achieve depending on the availability of the area for the installation of a photovoltaic system and the energy demand for lighting. The methodology is divided into five steps aimed at calculating the parameters required to characterize the roundabouts from the point of view of the electricity that can be generated by the photovoltaic systems installed, and then to evaluate the energy consumption required to operate the different system solutions for lighting. The mini roundabouts are not considered as a location for the photovoltaic system; in fact, the minimum diameter must be between 29 and 34 m. Considering the available irradiance in Italy, systems with monocrystalline silicon modules are sufficient to ensure energy self-sufficiency at diameters of 24 m or more. Systems with polycrystalline silicon modules are suitable to ensure energy self-sufficiency at diameters of 25/26 m or more. Photovoltaic (PV) technology continues to make progress in increasing efficiency, such as bifacial PV modules. This means that even smaller roundabouts could be eligible for a PV system sized to meet local electricity needs.

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Noorollahi, Younes, Hamed Janalizadeh, Hossein Yousefi i Mohammad Hossein Jahangir. "Biofuel for energy self-sufficiency in agricultural sector of Iran". Sustainable Energy Technologies and Assessments 44 (kwiecień 2021): 101069. http://dx.doi.org/10.1016/j.seta.2021.101069.

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Jensterle, Urban. "Energy self-sufficiency of mountain huts in Triglav National Park". Dela, nr 40 (31.12.2013): 215. http://dx.doi.org/10.4312/dela.40.12.215-231.

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Ohimain, Elijah I., i Sylvester C. Izah. "Energy self-sufficiency of smallholder oil palm processing in Nigeria". Renewable Energy 63 (marzec 2014): 426–31. http://dx.doi.org/10.1016/j.renene.2013.10.007.

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43

Kim, Jong-Jin. "Energy self-sufficiency of office buildings in four Asian cities". Advances in Energy Research 2, nr 1 (25.03.2014): 11–20. http://dx.doi.org/10.12989/eri.2014.2.1.011.

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Ramos, V., R. Carballo, M. Álvarez, M. Sánchez i G. Iglesias. "A port towards energy self-sufficiency using tidal stream power". Energy 71 (lipiec 2014): 432–44. http://dx.doi.org/10.1016/j.energy.2014.04.098.

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45

Ayala-Gilardón, Alejandro, José Sánchez-Pacheco, Mariano Sidrach-de-Cardona i Llanos Mora-López. "Analysis of self-sufficiency and self-consumption for PV installations for different locations". WEENTECH Proceedings in Energy 4, nr 2 (10.01.2019): 203–10. http://dx.doi.org/10.32438/wpe.5418.

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In this paper the performances of self-consumption facilities for different locations are evaluated. The four cities that have been analysed are Berlin, Madrid, Paris and Rome. The consumption profile corresponds to a residential consumption of 20 kWh/day. We propose to use two parameters to this evaluation: the percentage of self-consumption (PV directly consumed / total PV produced) and the percentage of self-sufficiency (PV directly consumed / total consumption). Several hypotheses have been checked attending to the size of the installation and the availability of solar resource. The size corresponding to a zero energy building has been proposed as reference power; for this reference size, the energy supplied by the PV system is approximately equal to the consumption for a one-year period of time. Using this size as a reference, several different PV sizes ranging from 0.5 to 3 times this reference size have been analyzed. For all of them, the self-sufficiency and self-consumption factors have been estimated. We have found that the values of peak power necessary to get ZEB range from 4.8 to 7.2 kW and that the self-consumption and self-sufficiency factors are of 40 and 36 % respectively. For each location it has been analyzed the best PV size depending on the applying regulation, basically depending on whether it is possible to do net metering or it is possible to sell the energy injected to the grid.

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Koke, Johannes, André Schippmann, Jingchun Shen, Xingxing Zhang, Peter Kaufmann i Stefan Krause. "Strategies of Design Concepts and Energy Systems for Nearly Zero-Energy Container Buildings (NZECBs) in Different Climates". Buildings 11, nr 8 (18.08.2021): 364. http://dx.doi.org/10.3390/buildings11080364.

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Container-based lightweight buildings offer a high ecologic and economic potential when they are designed as nearly zero-energy container buildings (NZECBs). Thus, they are relevant to energy transition in achieving an almost climate-neutral building stock. This paper describes and applies design strategies for suitable building concepts and energy systems to be used in NZECBs for different climates. Therefore, different applications in representative climatic zones were selected. Initially, the global climate zones were characterized and analyzed with regard to their potential for self-sufficiency and renewable energies in buildings. The design strategies were further developed and demonstrated for three cases: a single-family house in Sweden, a multi-family house in Germany, and a small school building in rural Ethiopia. For each case, design guidelines were derived and building concepts were developed. On the basis of these input data, various energy concepts were developed in which solar and wind energy, as well as biomass, were integrated as renewable energy sources. All the concepts were simulated and analyzed with the Polysun® software. The various approaches were compared and evaluated, particularly with regard to energy self-sufficiency. Self-sufficiency rates up to 80% were achieved. Finally, the influence of different climate zones on the energy efficiency of the single-family house was studied as well as the influence of the size of battery storage and insulation.

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Jiménez-Castillo, Gabino, Francisco José Muñoz-Rodríguez, Antonio Javier Martinez-Calahorro, Giuseppe Marco Tina i Catalina Rus-Casas. "Impacts of Array Orientation and Tilt Angles for Photovoltaic Self-Sufficiency and Self-Consumption Indices in Olive Mills in Spain". Electronics 9, nr 2 (18.02.2020): 348. http://dx.doi.org/10.3390/electronics9020348.

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Olive mills are extensive in the Mediterranean Basin, and Spain constitutes approximately 45% of global production. The industrial sector faces a new energetic paradigm where distributed generation provided by small renewable energy sources may reduce the dependence from fossil energy sources as well as avoid energy distribution losses. Photovoltaic self-consumption systems can play an important role in confronting this challenge due to their modularity and their decreasing cost. Most of self-sufficiency energy studies are focused on building sector and discussions about the idiosyncrasy of industrial load profiles, and their matching capability with photovoltaic generation profiles can be scarcely found. This work analyzes the potential of photovoltaic self-consumption systems as a function of the array power, array tilt, and orientation angles to face the electric consumption in olive mills. Different recording intervals and reporting periods are considered. Results show that a self-sufficiency index of 40% may be achieved on olive harvest basis. Moreover, due to the load profile particularities, percentage error lower than 1.6% has been found when considering a recording interval of 60 min when matching the olive load consumption and photovoltaic generation profiles. Chosen array tilt and orientation angles may be key parameters to maximize the self-sufficiency index.

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Vincent, Lenouvel, Lafforgue Michel, Chevauché Catherine i Rhétoré Pauline. "The energy cost of water independence: the case of Singapore". Water Science and Technology 70, nr 5 (26.06.2014): 787–94. http://dx.doi.org/10.2166/wst.2014.290.

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Finding alternative resources to secure or increase water availability is a key issue in most urban areas. This makes the research of alternative and local water resources of increasing importance. In the context of political tension with its main water provider (Malaysia), Singapore has been implementing a comprehensive water policy for some decades, which relies on water demand management and local water resource mobilisation in order to reach water self-sufficiency by 2060. The production of water from alternative resources through seawater desalination or water reclamation implies energy consumptive technologies such as reverse osmosis. In the context of increasing energy costs and high primary energy dependency, this water self-sufficiency objective is likely to be an important challenge for Singapore. The aim of this paper is to quantify the long-term impact of Singapore's water policy on the national electricity bill and to investigate the impact of Singapore's projects to reduce its water energy footprint. We estimate that 2.0% of the Singaporean electricity demand is already dedicated to water and wastewater treatment processes. If its water-energy footprint dramatically increases in the coming decades, ambitious research projects may buffer the energy cost of water self-sufficiency.

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Barva, Akash V., i Siddharth Joshi. "Empowering hybrid renewable energy systems with BESS for self-consumption and self-sufficiency". Journal of Energy Storage 82 (marzec 2024): 110561. http://dx.doi.org/10.1016/j.est.2024.110561.

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Słotwiński, Szymon. "Building Energy Self-Sufficiency of Municipalities on the Basis of National Legal Conditions in the Theoretical Perspective of the Polish Legal Experiences". Energies 15, nr 9 (20.04.2022): 3000. http://dx.doi.org/10.3390/en15093000.

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In today’s social, economic, and political reality, it cannot be overlooked that the energy self-sufficiency of municipalities not only optimizes the lives of the inhabitants of the municipality but also, in a broader perspective, the services provided by the municipality. The sustainable development of a municipality will therefore depend on its degree of self-reliance and self-sufficiency. Economic and technological considerations are not sufficient for the municipality to achieve optimal energy independence without normative conditions. The current (2021/2022) trends in electricity prices and in the development of national and international policies and strategies for electricity generation from renewable energy sources also make the change in the energy market structure toward distributed generation. The main objective of this paper is a theoretical analysis of the legal solutions in force in Poland that allow building energy self-sufficiency in municipalities and their adequacy to the current economic, technological, and political conditions. The scientific discussion will focus here on research problems related to the impact of the national regulations on the gradual assumption of control by municipalities over the generation and distribution of electricity with regard to energy produced in RES installations and the independence of municipalities from the national energy management and supply system.

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