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An economic development model analyzes the adoption of alternative strategy capable of leveraging the economy, based essentially on RES. The combination of wind turbine, PV installation with new technology battery energy storage, DSM network and RES forecasting algorithms maximizes RES integration in isolated islands. An innovative model of power system (PS) imbalances is presented, which aims to capture various features of the stochastic behavior of imbalances and to reduce in average reserve requirements and PS risk. Deep learning techniques for medium-term wind speed and solar irradiance forecasting are presented, using for first time a specific cloud index. Scalability-replicability of the FLEXITRANSTORE technology innovations integrates hardware-software solutions in all areas of the transmission system and the wholesale markets, promoting increased RES. A deep learning and GIS approach are combined for the optimal positioning of wave energy converters. An innovative methodology to hybridize battery-based energy storage using supercapacitors for smoother power profile, a new control scheme and battery degradation mechanism and their economic viability are presented. An innovative module-level photovoltaic (PV) architecture in parallel configuration is introduced maximizing power extraction under partial shading. A new method for detecting demagnetization faults in axial flux permanent magnet synchronous wind generators is presented. The stochastic operating temperature (OT) optimization integrated with Markov Chain simulation ascertains a more accurate OT for guiding the coal gasification practice.

Technology: general issues --- History of engineering & technology --- entrained flow coal gasification --- ash melting point --- operation temperature --- Markov process --- stochastic optimization model --- genetic algorithm --- gallium nitride --- magnetic-free converters --- module-level converters --- parallel architecture --- partial shading --- photovoltaic systems --- switched capacitor converters --- hybrid energy storage system --- supercapacitor --- lead–acid battery --- energy management system --- battery degradation --- depth of discharge --- techno-economic analysis --- hybrid power station --- green island --- energy storage --- remote community --- reserves --- k-means --- probabilistic dimensioning --- dynamic dimensioning --- balancing --- wave energy converters --- deep neural networks --- renewable energy sources --- spatial planning --- sentinel satellite imagery --- permanent magnet synchronous machines --- generators --- fault detection --- demagnetization --- artificial intelligence --- data mining --- machine learning --- advanced deep learning --- windspeed forecasting --- solar irradiation forecasting --- increased RES penetration --- smart grid --- scalability --- replicability --- FLEXITRANSTORE --- Angolan economy --- diversification --- strategic alternative --- biofuels

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Concerns relating to energy supply and climate change have driven renewable energy targets around the world. Marine renewable energy could make a significant contribution to reducing greenhouse gas emissions and mitigating the consequences of climate change, while providing a high-technology industry. The conversion of wave and tidal energy into electricity has many advantages. Individual tidal and wave energy devices have been installed and proven, with commercial arrays planned throughout the world. The wave and tidal energy industry has developed rapidly in the past few years; therefore, it seems timely to review current research and map future challenges. Methods to improve understanding of the resource and interactions (between energy extraction, the resource and the environment) are considered, such as resource characterisation (including electricity output), design considerations (e.g., extreme and fatigue loadings) and environmental impacts, at all timescales (ranging from turbulence to decadal) and all spatial scales (from device and array scales to shelf sea scales).

tide-surge-wave model --- Taiwanese waters --- sea-state hindcast --- wave power --- wave energy --- unstructured grid model --- resource characterization --- WaveWatch III --- SWAN --- tidal energy --- experimental testing --- acoustic Doppler profiler --- Strangford Lough --- dc-dc bidirectional converter --- finite control set-model predictive control (FCS-MPC) --- oscillating water column (OWC) --- supercapacitor energy storage (SCES) --- wave climate variability --- wavelet analysis --- teleconnection patterns --- marine renewable energy --- ocean energy --- environmental effects --- wave modeling --- wave propagation --- numerical modeling --- sediment dynamics --- risk assessment --- marine current energy --- spiral involute blade --- hydrodynamic analysis --- numerical simulation --- wave energy trends --- reanalysis wave data --- Chilean coast --- renewable energy --- wave energy converters --- annual mean power production --- wave energy converter --- transmission coefficient --- absorption --- surfing amenity --- resource --- impact assessment --- feasibility study --- floating offshore wave farm --- WEC --- IRR --- LCOE --- marine energy --- unmanned ocean device --- multi-type floating bodies --- nonlinear Froude-Krylov force --- energy efficiency

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In the current scenario in which climate change dominates our lives and in which we all need to combat and drastically reduce the emission of greenhouse gases, renewable energies play key roles as present and future energy sources. Renewable energies vary across a wide range, and therefore, there are related studies for each type of energy. This Special Issue is composed of studies integrating the latest research innovations and knowledge focused on all types of renewable energy: onshore and offshore wind, photovoltaic, solar, biomass, geothermal, waves, tides, hydro, etc. Authors were invited submit review and research papers focused on energy resource estimation, all types of TRL converters, civil infrastructure, electrical connection, environmental studies, licensing and development of facilities, construction, operation and maintenance, mechanical and structural analysis, new materials for these facilities, etc. Analyses of a combination of several renewable energies as well as storage systems to progress the development of these sustainable energies were welcomed.

Technology: general issues --- RE prospects and challenges --- RE regulations and policy --- RE in Bangladesh --- geothermal energy --- induced seismicity --- fault --- Basel --- poroelasticity --- HEM --- PV sizing --- Load scheduling --- Dijkstra Algorithm --- BPSO --- GA --- optimization --- wind farm --- pumped storage --- isolated systems --- power plant efficiency --- compact pigeon-inspired optimization --- maximum short-term generation --- swarm intelligence --- hydroelectric power station --- strategic planning --- site selection process --- offshore wind farms --- geographic information systems --- portfolio analysis --- Greece --- renewable energy --- photovoltaic generation --- battery storage --- reliability evaluation --- Monte Carlo Simulation --- photovoltaics (PV) --- biomass --- off-grid electrification --- feasibility analysis --- cost analysis --- simple payback period --- CO2 emissions --- residential energy-related CO2 emissions --- less developed regions --- urban and rural regions --- LMDI --- Tapio decoupling --- Jiangxi province --- Hybrid energy system --- wind power --- photovoltaic --- hosting capacity --- distribution system --- integrated system --- floating buoy --- offshore structure --- wave energy converter --- non-negative spring stiffness --- renewable–growth hypothesis --- renewable electricity --- economic growth --- renewable manufacturing --- energy–growth nexus --- inverters --- converters --- distributed generators --- utility grid --- hierarchical control --- PHEV --- NEDC --- WLTP --- energy consumption --- NEV credit regulation --- subsidy policy --- frequency control --- power system stability --- variable renewable energy sources --- wind power plants --- photovoltaic power plants --- wave energy converters --- heaving point absorber --- design and performance --- spatial and temporal variation --- emergy --- emergetic ternary diagrams --- sustainability --- environmental loading --- energy systems assessment --- solar updraft tower --- artificial neural network --- principal component analysis --- wave overtopping rate --- photovoltaic spatial planning --- photovoltaic carrying capacity --- influence factors --- optimization strategies --- carrying capacity distribution --- planning adjustment --- renewable energy resources --- grid integrated solar PV systems --- sustainable power generation --- maximum power point tracking --- grid reliability and voltage source converter

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Preface Several countries have recently realized that the present paradigm of development in environmental and energy fields is unsustainable. As global awareness of environmental issues grows, governments worldwide are promoting policies which aim to limit the harmful effects of human development on the environment. In particular, these novel policies seek to address the rapid increase of the global temperature (especially in the polar regions) as well as to manage human plastic waste accumulating in seas. To resolve these issues will require a number of actions to be implemented; unfortunately, the recent COP 24 Conference was unsuccessful in establishing a global agreement to achieve these actions. In order for the upcoming 2020 COP 26 Conference to be successful in creating such an agreement, the scientific community must support the policymakers’ efforts. Within this framework, it is necessary to show the efforts of countries worldwide as they try to negotiate an agreement to increase the energy efficiency and reduce greenhouse gas (GHG) emissions. In addition, the research reports generated can provide quantitative measures of the necessary actions to be implemented in order to address sustainable and efficient energy use. Among other topics, the papers presented in this issue investigate innovations in novel efficient and environmentally friendly technologies mainly based on renewable energy sources. The study also highlights the different sectors involved in this task, such as energy conversion systems, urban areas, mobility, sustainability, water management, social aspects, etc. In this field, the Sustainable Development of Energy, Water and Environment Systems (SDEWES) conference provides the foremost forum for discussion on these topics. The 13th Sustainable Development of Energy, Water and Environment Systems Conference was held in Palermo, Italy in 2018. This Special Issue of Energies, precisely dedicated to 13th SDEWES Conference, features papers in three main topics: Energy policy and energy efficiency in urban areas, energy efficiency in industry, biomass and other miscellaneous energy systems.

Research & information: general --- sewage sludge --- torrefaction --- steam gasification --- tars --- water recycling --- wastewater treatment --- environmental and energy performance --- life cycle assessment (LCA) --- crude oil refining --- high-efficiency cogeneration --- primary energy saving --- electricity from cogeneration --- paper industry --- GateCycle --- CO2 emissions avoided --- sinter --- porous media --- local thermal non-equilibrium --- exergy destruction minimization --- BP neural network --- genetic algorithm --- urban simulation --- photovoltaics --- heat pump --- co-generation --- heat demand analysis --- low-temperature district heating --- district cooling --- energy storage --- linear programming --- tropical climate --- integrated energy modelling --- energy system optimization --- temporal resolution --- energy planning --- variable renewable energy sources --- Discrete Element Model --- gas–solid flow --- heat transfer enhancement --- entransy dissipation --- numerical simulation --- optimization --- control strategy --- peak-shaving --- mCHP --- Stirling engine --- renewable energy --- energy consumption profile --- heavy truck traffic --- road transport --- liquefied natural gas (LNG) --- alternative fuels --- hydrogen --- hydrogen pipelines --- hydrogen transmission --- pipeline transmission --- pressure drop --- pinch analysis --- heat exchanger network (HEN) design --- plus-minus principle --- supply temperature --- disturbances --- maximum energy recovery --- bypass --- economic evaluation --- two-phase flow regime --- airlift pump --- void fraction --- image analysis --- efficiency optimization --- energy microgrids --- energy system integration --- smart building clusters --- hybrid renewable systems --- heat pumps --- district heating --- cogeneration --- natural gas --- natural gas regulation station --- turboexpander --- pressure regulator --- energy recovery --- energy conversion --- energy system analysis --- flue gas heat recovery --- exergy --- coefficient of performance --- thermoelectric generator --- organic rankine cycle --- district energy systems --- anaerobic digestion and composting --- circular economy --- energy return on investment --- hydrogen bioenergy --- food waste hierarchy --- biofuel --- CI engine --- combustion --- emission --- greenhouse gas --- jatropha biodiesel --- nanoparticle --- performance --- Covenant of Mayors --- indirect emission allocation --- local energy generation --- geoenergetics --- ground source heat pumps --- borehole heat exchangers --- thermal response test --- borehole thermal energy storage --- bioelectricity --- carbon capture --- negative emissions --- sugarcane --- biomass --- climate change --- wave energy converters --- Power Take Off --- EP4 --- latching --- wave flume --- floating --- moorings --- renewable electricity generation systems --- SDEWES 2018 --- chicken manure --- proximate and ultimate analysis --- energy potential --- sustainable smart city --- mathematical optimisation --- urban design --- bilevel modelling --- location theory --- traffic assignment --- infrastructure expansion --- building location --- sustainable development --- energy efficiency in industry --- sewage sludge --- torrefaction --- steam gasification --- tars --- water recycling --- wastewater treatment --- environmental and energy performance --- life cycle assessment (LCA) --- crude oil refining --- high-efficiency cogeneration --- primary energy saving --- electricity from cogeneration --- paper industry --- GateCycle --- CO2 emissions avoided --- sinter --- porous media --- local thermal non-equilibrium --- exergy destruction minimization --- BP neural network --- genetic algorithm --- urban simulation --- photovoltaics --- heat pump --- co-generation --- heat demand analysis --- low-temperature district heating --- district cooling --- energy storage --- linear programming --- tropical climate --- integrated energy modelling --- energy system optimization --- temporal resolution --- energy planning --- variable renewable energy sources --- Discrete Element Model --- gas–solid flow --- heat transfer enhancement --- entransy dissipation --- numerical simulation --- optimization --- control strategy --- peak-shaving --- mCHP --- Stirling engine --- renewable energy --- energy consumption profile --- heavy truck traffic --- road transport --- liquefied natural gas (LNG) --- alternative fuels --- hydrogen --- hydrogen pipelines --- hydrogen transmission --- pipeline transmission --- pressure drop --- pinch analysis --- heat exchanger network (HEN) design --- plus-minus principle --- supply temperature --- disturbances --- maximum energy recovery --- bypass --- economic evaluation --- two-phase flow regime --- airlift pump --- void fraction --- image analysis --- efficiency optimization --- energy microgrids --- energy system integration --- smart building clusters --- hybrid renewable systems --- heat pumps --- district heating --- cogeneration --- natural gas --- natural gas regulation station --- turboexpander --- pressure regulator --- energy recovery --- energy conversion --- energy system analysis --- flue gas heat recovery --- exergy --- coefficient of performance --- thermoelectric generator --- organic rankine cycle --- district energy systems --- anaerobic digestion and composting --- circular economy --- energy return on investment --- hydrogen bioenergy --- food waste hierarchy --- biofuel --- CI engine --- combustion --- emission --- greenhouse gas --- jatropha biodiesel --- nanoparticle --- performance --- Covenant of Mayors --- indirect emission allocation --- local energy generation --- geoenergetics --- ground source heat pumps --- borehole heat exchangers --- thermal response test --- borehole thermal energy storage --- bioelectricity --- carbon capture --- negative emissions --- sugarcane --- biomass --- climate change --- wave energy converters --- Power Take Off --- EP4 --- latching --- wave flume --- floating --- moorings --- renewable electricity generation systems --- SDEWES 2018 --- chicken manure --- proximate and ultimate analysis --- energy potential --- sustainable smart city --- mathematical optimisation --- urban design --- bilevel modelling --- location theory --- traffic assignment --- infrastructure expansion --- building location --- sustainable development --- energy efficiency in industry

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Preface Several countries have recently realized that the present paradigm of development in environmental and energy fields is unsustainable. As global awareness of environmental issues grows, governments worldwide are promoting policies which aim to limit the harmful effects of human development on the environment. In particular, these novel policies seek to address the rapid increase of the global temperature (especially in the polar regions) as well as to manage human plastic waste accumulating in seas. To resolve these issues will require a number of actions to be implemented; unfortunately, the recent COP 24 Conference was unsuccessful in establishing a global agreement to achieve these actions. In order for the upcoming 2020 COP 26 Conference to be successful in creating such an agreement, the scientific community must support the policymakers’ efforts. Within this framework, it is necessary to show the efforts of countries worldwide as they try to negotiate an agreement to increase the energy efficiency and reduce greenhouse gas (GHG) emissions. In addition, the research reports generated can provide quantitative measures of the necessary actions to be implemented in order to address sustainable and efficient energy use. Among other topics, the papers presented in this issue investigate innovations in novel efficient and environmentally friendly technologies mainly based on renewable energy sources. The study also highlights the different sectors involved in this task, such as energy conversion systems, urban areas, mobility, sustainability, water management, social aspects, etc. In this field, the Sustainable Development of Energy, Water and Environment Systems (SDEWES) conference provides the foremost forum for discussion on these topics. The 13th Sustainable Development of Energy, Water and Environment Systems Conference was held in Palermo, Italy in 2018. This Special Issue of Energies, precisely dedicated to 13th SDEWES Conference, features papers in three main topics: Energy policy and energy efficiency in urban areas, energy efficiency in industry, biomass and other miscellaneous energy systems.

Research & information: general --- sewage sludge --- torrefaction --- steam gasification --- tars --- water recycling --- wastewater treatment --- environmental and energy performance --- life cycle assessment (LCA) --- crude oil refining --- high-efficiency cogeneration --- primary energy saving --- electricity from cogeneration --- paper industry --- GateCycle --- CO2 emissions avoided --- sinter --- porous media --- local thermal non-equilibrium --- exergy destruction minimization --- BP neural network --- genetic algorithm --- urban simulation --- photovoltaics --- heat pump --- co-generation --- heat demand analysis --- low-temperature district heating --- district cooling --- energy storage --- linear programming --- tropical climate --- integrated energy modelling --- energy system optimization --- temporal resolution --- energy planning --- variable renewable energy sources --- Discrete Element Model --- gas–solid flow --- heat transfer enhancement --- entransy dissipation --- numerical simulation --- optimization --- control strategy --- peak-shaving --- mCHP --- Stirling engine --- renewable energy --- energy consumption profile --- heavy truck traffic --- road transport --- liquefied natural gas (LNG) --- alternative fuels --- hydrogen --- hydrogen pipelines --- hydrogen transmission --- pipeline transmission --- pressure drop --- pinch analysis --- heat exchanger network (HEN) design --- plus-minus principle --- supply temperature --- disturbances --- maximum energy recovery --- bypass --- economic evaluation --- two-phase flow regime --- airlift pump --- void fraction --- image analysis --- efficiency optimization --- energy microgrids --- energy system integration --- smart building clusters --- hybrid renewable systems --- heat pumps --- district heating --- cogeneration --- natural gas --- natural gas regulation station --- turboexpander --- pressure regulator --- energy recovery --- energy conversion --- energy system analysis --- flue gas heat recovery --- exergy --- coefficient of performance --- thermoelectric generator --- organic rankine cycle --- district energy systems --- anaerobic digestion and composting --- circular economy --- energy return on investment --- hydrogen bioenergy --- food waste hierarchy --- biofuel --- CI engine --- combustion --- emission --- greenhouse gas --- jatropha biodiesel --- nanoparticle --- performance --- Covenant of Mayors --- indirect emission allocation --- local energy generation --- geoenergetics --- ground source heat pumps --- borehole heat exchangers --- thermal response test --- borehole thermal energy storage --- bioelectricity --- carbon capture --- negative emissions --- sugarcane --- biomass --- climate change --- wave energy converters --- Power Take Off --- EP4 --- latching --- wave flume --- floating --- moorings --- renewable electricity generation systems --- SDEWES 2018 --- chicken manure --- proximate and ultimate analysis --- energy potential --- sustainable smart city --- mathematical optimisation --- urban design --- bilevel modelling --- location theory --- traffic assignment --- infrastructure expansion --- building location --- sustainable development --- energy efficiency in industry