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Geothermal energy is a renewable, sustainable, and ecologically friendly resource of energy that can be captured with shallow or deep installations, or a combination of both—alone or integrated with other technologies. It can then be employed for a variety of purposes, for example, electricity generation, space heating and cooling, agriculture, and aquaculture. Given the nature/features of this green energy resource—such as being a local, climate-independent, potentially constant, robust, generally available, resilient, almost greenhouse gas-free, and long-lived energy source—geothermal solutions can and should make a more prominent contribution to the future global energy supply mix, in addition to helping lessen humanity’s environmental footprint and enabling it to attain its sustainable development goals. This Special Issue, “New Trends in Enhanced, Hybrid and Integrated Geothermal Systems”, addresses existing knowledge gaps and aids advance deployment of geothermal energy globally. It consists of eight peer-reviewed papers that cover a range of subjects and applications related to geothermal energy.

tri-generation --- off-design analysis --- ammonia-water solution --- geothermal --- flexible demand production --- optimization --- standing column well (SCW) --- thermal response test --- effective thermal conductivity --- bleeding rate --- thermal conductivity --- balancing well --- coefficient of performance (COP) --- ground heat exchanger --- 3D simulation --- finned U-tube --- external fin --- internal fin --- dynamic simulation --- conventional geothermal --- direct heat use --- Western Canadian Sedimentary Basin --- bottomhole temperatures --- Alberta --- well-doublet system --- sustainability --- disequilibrium --- thermomechanical effects --- chemical coupling --- climate change --- heat transfer --- granite fracture --- flow direction --- enhanced geothermal system --- renewable energy --- geothermal energy --- mature oilfield --- abandoned hydrocarbon well --- wellbore heat exchanger --- Pannonian basin --- geothermal cascade use --- energy efficiency --- wellness and spa facilities --- balneology --- bioclimatic architecture --- passive design strategies --- modular building --- n/a

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The ongoing digitalization of the energy sector, which will make a large amount of data available, should not be viewed as a passive ICT application for energy technology or a threat to thermodynamics and fluid dynamics, in the light of the competition triggered by data mining and machine learning techniques. These new technologies must be posed on solid bases for the representation of energy systems and fluid machinery. Therefore, mathematical modelling is still relevant and its importance cannot be underestimated. The aim of this Special Issue was to collect contributions about mathematical modelling of energy systems and fluid machinery in order to build and consolidate the base of this knowledge.

centrifugal pump --- double hidden layer --- Levenberg–Marquardt algorithm --- performance prediction --- thermal energy storage --- stratification --- dynamic simulation --- heating --- double-channel sewage pump --- critical wall roughness --- numerical calculation --- external characteristics --- axial-flow pump --- impeller --- approximation model --- optimization design --- multi-disciplinary --- blade slot --- orthogonal test --- numerical simulation --- Francis turbine --- anti-cavity fins --- draft tube --- vortex rope --- low flow rates --- internal flow characteristics --- unsteady pressure --- energy recovery --- turboexpander --- throttling valves --- CFD --- modelling techniques --- Kaplan turbine --- draft tube optimization --- CFD analysis --- DOE --- response surface --- single-channel pump --- CFD-DEM coupling method --- particle features and behaviors --- solid-liquid two-phase flows --- computational fluid dynamics (CFD) --- artificial neural network (ANN) --- subcooled boiling flows --- uncertainty quantification (UQ) --- Monte Carlo dropout --- deep ensemble --- deep neural network (DNN) --- intake structures --- physical hydraulic model --- free surface flow --- free surface vortices --- vertical pump --- design considerations --- magnetocaloric effect --- coefficient of performance --- refrigeration --- capacity --- mathematical modelling --- energy systems

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The present book contains the 16 papers accepted and published in the Special Issue “Mathematical Modeling and Simulation in Mechanics and Dynamic Systems” of the MDPI “Mathematics” journal, which cover a wide range of topics connected to the theory and applications of Modeling and Simulation of Dynamic Systems in different field. These topics include, among others, methods to model and simulate mechanical system in real engineering. It is hopped that the book will find interest and be useful for those working in the area of Modeling and Simulation of the Dynamic Systems, as well as for those with the proper mathematical background and willing to become familiar with recent advances in Dynamic Systems, which has nowadays entered almost all sectors of human life and activity.

T-stress --- X-FEM --- notch --- pipe --- stress difference method (SDM) --- system of transcendental equation --- computational solutions --- code-based modelling approach --- numerical analysis --- Sine-Gordon equations --- photovoltaics --- thermophotovoltaics --- solar energy --- polymer CNTs systems --- interphase section --- percolation onset --- mechanics --- high temperature proton exchange membrane fuel cell --- exergy analysis --- ecological analysis --- ecological coefficient of performance --- SARS-CoV-2 --- COVID-19 --- SEIRD (Susceptible, Exposed, Infected and Recovered and Death) --- SDL --- Catalonia --- nanowire cantilever --- stochastic model --- double Lorentzian spectrum --- HT-PEMFC --- irreversibility --- finite time thermodynamic optimization --- power density --- thermodynamic efficiency --- geometric analogy --- similarity theory --- dimensional analysis --- model law --- heat transfer --- straight bar --- Deep Learning (DL) --- Computational Fluid Dynamics (CFD) --- Artificial Neural Network (ANN) --- Convolutional Neural Network (CNN) --- turbulent flow --- machine learning --- deep learning --- artificial neural network --- ANN --- PEM fuel cell --- modeling --- control --- differentiability --- fractal hydrodynamic regimes --- fractal Schrödinger regimes --- fractal soliton --- fractal kink --- “holographic implementations” --- cubics --- apolar transport --- harmonic mapping principle --- period doubling scenario --- state probability functions --- partial aging in standby --- Monte Carlo simulation --- qualitative and quantitative verification of simulation model --- Lagrange–d’Alembert principle --- non-conservative dynamical system --- Euler–Poincaré equation --- helicopter model --- Lie group --- extended iso-geometric analysis --- extended finite element method --- crack --- pipeline --- ABAQUS --- harmonic mapping --- complex system dynamics --- SL (2R) group --- hidden symmetries --- computer simulations --- actual systems --- transfer learning --- autonomous feature extraction --- n/a --- fractal Schrödinger regimes --- "holographic implementations" --- Lagrange-d'Alembert principle --- Euler-Poincaré equation

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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.

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