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The depletion of natural energy resources provides evidential adverse impacts on world economy functionality. The strong requirement of a sustainable energy supply has escalated intensive research and the discovery of cleaner energy sources, as well as efficient energy management practices. In the context of a circular economy, this research not only targets the optimisation of resources utilisation at different stages but also emphasises the eco-design of products to extend production life spans. Based on this concept, this book discusses the roles of process integration approaches, renewable energy sources utilisation and design modifications in addressing the process energy and exergy efficiency improvement. The primary focus is to enhance the economic and environmental performance through process analysis, modelling and optimisation. The articles mainly show the contribution of each aspect: (a) design and numerical study for innovative energy-efficient technologies, (b) process integration—heat and power, (c) process energy efficiency or emission analysis, and (d) optimisation of renewable energy resources’ supply chain. The articles are based on the latest contribution of this journal’s Special Issues in the 21st conference entitled “Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)”. This book is complemented with an editorial review to highlight the broader state-of-the-art development.

particulate matter --- fine particles --- combustion particles --- nucleation --- particle growth --- data envelopment analysis --- energy efficiency --- food loss and waste --- life-cycle assessment --- welding residual stress --- welding deflection --- T-joint fillet weld --- preheat temperature --- interpass time --- finite element analysis --- water desalination --- water supply --- water shortage --- energy demand --- environmental impacts --- specific energy consumption --- cryogenic energy storage --- air liquefaction --- exergy analysis --- economic analysis --- exergoeconomic analysis --- heat exchanger network --- structural controllability --- structural observability --- operability --- network science --- sensor and actuator placement --- simplified methods --- design procedure --- convection section --- radiant section --- flow distribution --- heat flux distribution --- boiler --- solar collector network --- minimum number of solar collectors --- maximum operating time --- flexible operation --- district heating --- heat accumulation --- pipe --- numerical model --- Modelica language --- Julia language --- performance --- off-grid polygeneration --- micro-hydropower plant --- fuzzy optimization --- mixed-integer linear programming --- dual-turbine --- multi-objective --- heat exchanger network (HEN) --- synthesis --- optimization --- direct heat integration --- indirect heat integration --- piping --- pumping --- impinging jet --- dimple --- Nusselt number --- heat transfer --- heat exchanger --- flow boiling --- surface-enhanced tube --- heat transfer coefficient --- flow pattern --- total site heat integration --- heat recovery loop (HRL) --- heat storage --- Monte Carlo (MC) simulation --- data farming --- gasification --- biomass --- total solid particle --- trigeneration system --- process integration --- pinch analysis --- co-generation --- storage system --- trigeneration system cascade analysis --- energy conservation --- latent heat thermal energy storage --- phase change materials --- passive cooling --- bio-adsorbents --- chitosan microbeads --- nanoparticles --- anaerobic digestion --- biowaste --- life cycle assessment --- smart city --- waste collection --- P-Graph framework --- process network synthesis --- multi-periodic model --- sustainability --- co-firing --- wheat straw --- softwood --- bog peat --- pellets --- thermal decomposition --- combustion --- DC electric field --- computational fluid dynamics --- temperature contour --- cooling system --- mathematical optimization --- machine learning --- flexible control technology --- biomass co-firing --- biomass quality --- network optimization --- goal programming --- mixed integer nonlinear programming --- renewable energy sources --- energy-saving technologies

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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