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Water is necessary to produce energy, and energy is required to pump, treat, and transport water. The energy–water nexus examines the interactions between these two inextricably linked elements. This Special Issue aims to explore a single "system of systems" for the integration of energy systems. This approach considers the relationships between electricity, thermal, and fuel systems; and data and information networks in order to ensure optimal integration and interoperability across the entire spectrum of the energy system. This framework for the integration of energy systems can be adapted to evaluate the interactions between energy and water. This Special Issue focuses on the analysis of water interactions with and dependencies on the dynamics of the electricity sector and the transport sector

History of engineering & technology --- waste heat recovery --- absorption cooling --- water–energy nexus --- steelworks --- TRNSYS --- non-equilibrium molecular dynamics --- deformed carbon nanotubes --- deformed boron nitride nanotubes --- water transport --- diffusion --- Z-distortion --- XY-distortion --- screw distortion --- oil/water separation --- superhydrophilic/underwater-superoleophobic membranes --- opposite properties --- superhydrophobicity/superoleophilicity --- selective wettability --- micro/nanoscale composite structure --- virtual water network --- inter-provincial electricity transmission --- structural decomposition analysis --- electricity-water nexus --- cooling tower --- response surface model --- water --- power plant --- decarbonization --- energy concepts --- long-term energy storage --- power-to-gas --- power-to-X --- wastewater treatment --- anaerobic digestion --- water-energy nexus --- demand response --- energy consumption optimization --- multi-objective model --- urban water system --- local water supply --- electricity demand --- index decomposition analysis

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Marine power systems have been designed to be a safer alternative to stationary plants in order to adhere to the regulations of classification societies. Marine steam boilers recently achieved 10 MPa pressure, in comparison to stationary plants, where a typical boiler pressure of 17 MPa was the standard for years. The latest land-based, ultra-supercritical steam boilers reach 25 MPa pressure and 620 °C temperatures, which increases plant efficiency and reduces fuel consumption. There is little chance that such a plant concept could be applied to ships. The reliability of marine power systems has to be higher due to the lack of available spare parts and services that are available for shore power systems. Some systems are still very expensive and are not able to be widely utilized for commercial merchant fleets such as COGAS, mainly due to the high cost of gas turbines. Submarine vehicles are also part of marine power systems, which have to be reliable and accurate in their operation due to their distant control centers. Materials that are used in marine environments are prone to faster corrosive wear, so special care also should be taken in this regard. The main aim of this Special Issue is to discuss the options and possibilities of utilizing energy in a more economical way, taking into account the reliability of such a system in operation.

atmospheric drain tank --- energy analysis --- exergy analysis --- optimization --- marine propulsion --- propulsion failure --- propulsion failure analysis --- mechanical failure --- LNG tanker --- combined cycle --- propulsion main engine --- marine diesel engine --- split injection --- fuel consumption --- NOx emissions --- exergy destruction --- exergy efficiency --- marine steam turbine --- MLP neural network --- turbine cylinders --- reliability --- fault tree analysis --- failure diagnosis --- diesel engine turbocharger --- maintenance --- underwater vehicle --- isolation --- flexible foundation --- vibration mitigation --- CODLAG --- data-driven modelling --- genetic programming --- decay state coefficients --- submarine cable --- hydraulic jet --- jet parameter --- operation efficiency --- trigeneration energy system --- cogeneration --- absorption cooling --- heating and cooling output --- n/a

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• Reference Manager
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Water is necessary to produce energy, and energy is required to pump, treat, and transport water. The energy–water nexus examines the interactions between these two inextricably linked elements. This Special Issue aims to explore a single "system of systems" for the integration of energy systems. This approach considers the relationships between electricity, thermal, and fuel systems; and data and information networks in order to ensure optimal integration and interoperability across the entire spectrum of the energy system. This framework for the integration of energy systems can be adapted to evaluate the interactions between energy and water. This Special Issue focuses on the analysis of water interactions with and dependencies on the dynamics of the electricity sector and the transport sector

History of engineering & technology --- waste heat recovery --- absorption cooling --- water–energy nexus --- steelworks --- TRNSYS --- non-equilibrium molecular dynamics --- deformed carbon nanotubes --- deformed boron nitride nanotubes --- water transport --- diffusion --- Z-distortion --- XY-distortion --- screw distortion --- oil/water separation --- superhydrophilic/underwater-superoleophobic membranes --- opposite properties --- superhydrophobicity/superoleophilicity --- selective wettability --- micro/nanoscale composite structure --- virtual water network --- inter-provincial electricity transmission --- structural decomposition analysis --- electricity-water nexus --- cooling tower --- response surface model --- water --- power plant --- decarbonization --- energy concepts --- long-term energy storage --- power-to-gas --- power-to-X --- wastewater treatment --- anaerobic digestion --- water-energy nexus --- demand response --- energy consumption optimization --- multi-objective model --- urban water system --- local water supply --- electricity demand --- index decomposition analysis --- waste heat recovery --- absorption cooling --- water–energy nexus --- steelworks --- TRNSYS --- non-equilibrium molecular dynamics --- deformed carbon nanotubes --- deformed boron nitride nanotubes --- water transport --- diffusion --- Z-distortion --- XY-distortion --- screw distortion --- oil/water separation --- superhydrophilic/underwater-superoleophobic membranes --- opposite properties --- superhydrophobicity/superoleophilicity --- selective wettability --- micro/nanoscale composite structure --- virtual water network --- inter-provincial electricity transmission --- structural decomposition analysis --- electricity-water nexus --- cooling tower --- response surface model --- water --- power plant --- decarbonization --- energy concepts --- long-term energy storage --- power-to-gas --- power-to-X --- wastewater treatment --- anaerobic digestion --- water-energy nexus --- demand response --- energy consumption optimization --- multi-objective model --- urban water system --- local water supply --- electricity demand --- index decomposition analysis

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In recent years, the interest of the scientific community towards efficient energy systems has significantly increased. One of the reasons is certainly related to the change in the temperature of the planet, which has increased by 0.76 °C with respect to preindustrial levels, according to the Intergovernmental Panel on Climate Change (IPCC), and is still increasing. The European Union considers it vital to prevent global warming from exceeding 2 °C with respect to pre-industrial levels, as it has been proven that this will result in irreversible and potentially catastrophic changes. These changes in climate are mainly caused by greenhouse gas emissions related to human activities, and can be drastically reduced by employing energy systems for the heating and cooling of buildings, as well as for power production, characterized by high efficiency levels and/or based on renewable energy sources. This Special Issue, published in the Energies journal, includes 13 contributions from across the world, including a wide range of applications such as hybrid residential renewable energy systems, desiccant-based air handling units, heat exchanges for engine WHR, solar chimney systems, and other interesting topics.

visualization --- numerical and experimental studies --- geothermal energy --- modeling --- dynamic simulation --- spirally corrugated pipe --- ancillary services --- electric energy --- renewables --- batch transportation --- energy and environmental analysis --- energy storage --- microgrids --- optimization --- startup --- solar chimney --- bubble absorber --- tapping --- genetic programming --- plate heat exchanger --- computational fluid dynamics --- absorption cooling --- thermosyphon --- two-phase ejector --- desiccant wheel --- genetic algorithms --- radial ventilation duct --- fluid field --- steelmaking --- ground source heat pump --- fast thermal simulation --- Biot number --- turbo-electric generator --- solar heating and cooling --- exhaust steam --- method of calculation --- model predictive control --- R744 --- dynamic simulations --- linear regression --- crude oil pipeline --- thermal storage --- hygroscopic materials --- melting --- refining --- two-phase flow --- phase change --- heat pump --- hybrid systems --- predictive models --- bentonite buffer material --- backflow --- ground-air heat exchanger --- waste heat recovery --- Ca-type bentonite --- consumption --- protracted fin --- single-channel ventilation --- operating state --- refrigeration --- electric arc furnace --- ammonia-lithium nitrate --- drying --- exhaust emissions --- object-oriented modelling --- body-fitted coordinate-based proper orthogonal decomposition reduced-order model (BFC-POD-ROM) --- transport scheme determination --- analytical and experimental solutions --- thermal conductivity --- low-order model --- heat exchanger --- air-cooled steam turbine generator --- air flow