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The economical and efficient recovery of waste heat produced by industrial processes (such as chemical and petrochemical, food, pharmaceutical, energetics) and processes and applications in the municipal sphere (such as waste incinerators, heating plants, laundries, hospitals, server rooms) are priorities and challenges. This Special Issue focuses on heat exchangers as key and essential equipment for the practical realization of these challenges. The purpose of this Special Issue is to outline the latest insights and innovative and/or enhanced solutions from the design, production, operation, and maintenance points of view of heat exchangers in different applications of effective waste heat utilization.

waste heat recovery --- Organic Rankine Cycle --- turbo-compound --- brake specific fuel consumption --- engine thermal efficiency --- shell-and-tube heat exchanger --- disc-and-doughnut baffles --- segmental baffles --- multi-objective configuration optimization --- genetic algorithm --- computational fluid dynamics --- symmetric successive overrelaxation --- preconditioning --- performance --- cylindrical shape heat source --- thermoelectric generator --- radiative heat exchanger --- numerical analysis --- industrial experiment --- annular radiator --- performance calculation --- configuration optimization --- heat transfer unit --- plate-and-fin heat exchanger --- nondominated sorted genetic algorithm-II

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In October 2014, the EU leaders agreed upon three key targets for the year 2030: a reduction by at least 40% in greenhouse gas emissions, savings of at least 27% for renewable energy, and improvements by at least 27% in energy efficiency. The increase in computational power combined with advanced modeling and simulation tools makes it possible to derive new technological solutions that can enhance the energy efficiency of systems and that can reduce the ecological footprint. This book compiles 10 novel research works from a Special Issue that was focused on data-driven approaches, machine learning, or artificial intelligence for the modeling, simulation, and optimization of energy systems.

passive house --- enclosure structure --- heat transfer coefficient --- energy consumption --- turbo-propeller --- regional --- fuel --- weight --- range --- design --- CO2 reduction --- multi-objective combinatorial optimization --- meta-heuristics --- ant colony optimization --- non-intrusive load monitoring --- appliance classification --- appliance feature --- recurrence graph --- weighted recurrence graph --- V–I trajectory --- convolutional neural network --- energy baselines --- machine learning --- clustering --- neural methods --- smart intelligent systems --- building energy consumption --- building load forecasting --- energy efficiency --- thermal improved of buildings --- anti-icing --- heat and mass transfer --- heating power distribution --- heat load reduction --- optimization method --- experimental validation --- big data process --- predictive maintenance --- fracturing roofs to maintain entry (FRME) --- field measurement --- numerical simulation --- side abutment pressure --- strata movement --- energy --- manufacturing --- prediction --- forecasting --- modelling --- n/a --- V-I trajectory

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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

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Electrical machines are one of the most important components of the industrial world. They are at the heart of the new industrial revolution, brought forth by the development of electromobility and renewable energy systems. Electric motors must meet the most stringent requirements of reliability, availability, and high efficiency in order, among other things, to match the useful lifetime of power electronics in complex system applications and compete in the market under ever-increasing pressure to deliver the highest performance criteria. Today, thanks to the application of highly efficient numerical algorithms running on high-performance computers, it is possible to design electric machines and very complex drive systems faster and at a lower cost. At the same time, progress in the field of material science and technology enables the development of increasingly complex motor designs and topologies. The purpose of this Special Issue is to contribute to this development of electric machines. The publication of this collection of scientific articles, dedicated to the topic of electric machine design and application, contributes to the dissemination of the above information among professionals dealing with electrical machines.

electric AWD tractor --- SOC level --- simulation model --- load measurement system --- driving test --- brushless direct current motor with permanent magnet (BLDCM) --- winding configurations --- star --- delta --- star–delta --- fault states --- open circuit (OC) --- FFT --- neutral-point voltage --- electrical machine --- hydro generator --- faulty synchronization --- finite element method --- field-circuit modeling --- permanent magnet machines --- hybrid excitation --- electric vehicles --- wind power generator --- finite element methods --- variable speed machines --- synchronous generator --- permanent magnets --- demagnetization --- motor control --- switched reluctance motor --- MATLAB --- simulation --- wheel hub motor --- electric drive --- permanent magnet synchronous motor --- electrical machines --- thermal modeling --- preformed coils --- insulation systems --- pre-shaped conductor --- system model --- structural dynamics --- multibody simulation --- transient electrical machine model --- permanent magnet synchronous machine --- induction machine --- dynamic gear forces --- planetary gear --- synchronous condenser --- different materials --- magnetic flux leakage in the end --- eddy current loss --- fluid–solid coupling --- finite element analysis (FEA) --- interior PM synchronous motor --- surface PM synchronous motor --- traction applications --- finite element analysis --- flux switching machine --- flux bridge --- magnetic flux leakage --- variable flux machine --- axial flux generator --- spatial harmonic interaction --- harmonic balance method --- turbo-generator --- eddy current losses --- data driven --- support vector regression --- multi-layer perceptron --- vane pump --- electric motor --- integrated motor-pump assembly (IMPA) --- balanced vane pump --- fluid power drives --- brushless DC electric motor --- permanent magnet machine --- measurements --- high-speed motor --- electromagnetic analysis --- mechanical analysis --- thermal analysis --- electromechanical convertor --- drive system component --- electromagnetic calculation --- MR fluids --- MR multi-disc clutch --- clutch design --- electric train --- hybrid excited linear flux switching machine --- rope-less elevator --- n/a --- star-delta --- fluid-solid coupling