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The rising trend in the global energy demand poses new challenges to humankind. The energy and mechanical engineering sectors are called to develop new and more environmentally friendly solutions to harvest residual energy from primary production processes. The Organic Rankine Cycle (ORC) is an emerging energy system for power production and waste heat recovery. In the near future, this technology can play an increasing role within the energy generation sectors and can help achieve the carbon footprint reduction targets of many industrial processes and human activities. This Special Issue focuses on selected research and application cases of ORC-based waste heat recovery solutions. Topics included in this publication cover the following aspects: performance modeling and optimization of ORC systems based on pure and zeotropic mixture working fluids; applications of waste heat recovery via ORC to gas turbines and reciprocating engines; optimal sizing and operation of ORC under combined heat and power and district heating application; the potential of ORC on board ships and related issues; life cycle analysis for biomass application; ORC integration with supercritical CO2 cycle; and the proper design of the main ORC components, including fluid dynamics issues. The current state of the art is considered and some cutting-edge ORC technology research activities are examined in this book.

History of engineering & technology --- organic Rankine cycle system --- zeotropic mixture --- heat exchanger --- low grade heat --- thermodynamic optimization --- method comparison --- micro-ORC --- gear pump --- CFD --- mesh morphing --- pressure pulsation --- cavitation --- dynamic analysis --- energy analysis --- exergy analysis --- organic Rankine cycle --- waste heat recovery --- natural gas engine --- scroll --- opensource CFD --- OpenFOAM --- CoolFOAM --- WOM --- positive displacement machine --- expander --- ORC --- ORC integration technologies --- advanced thermodynamic cycles --- decentralised energy systems --- benzene --- toluene --- cyclopentane --- internal combustion engine --- cogeneration --- district heating --- low sulfur fuels --- regression model --- predictive model --- ship --- techno-economic feasibility --- machinery system optimization --- life cycle assessment --- biomass --- CHP --- carbon footprint of energy production --- Brayton --- environmental impact --- exergy --- life cycle analysis --- performance parameters

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The rising trend in the global energy demand poses new challenges to humankind. The energy and mechanical engineering sectors are called to develop new and more environmentally friendly solutions to harvest residual energy from primary production processes. The Organic Rankine Cycle (ORC) is an emerging energy system for power production and waste heat recovery. In the near future, this technology can play an increasing role within the energy generation sectors and can help achieve the carbon footprint reduction targets of many industrial processes and human activities. This Special Issue focuses on selected research and application cases of ORC-based waste heat recovery solutions. Topics included in this publication cover the following aspects: performance modeling and optimization of ORC systems based on pure and zeotropic mixture working fluids; applications of waste heat recovery via ORC to gas turbines and reciprocating engines; optimal sizing and operation of ORC under combined heat and power and district heating application; the potential of ORC on board ships and related issues; life cycle analysis for biomass application; ORC integration with supercritical CO2 cycle; and the proper design of the main ORC components, including fluid dynamics issues. The current state of the art is considered and some cutting-edge ORC technology research activities are examined in this book.

History of engineering & technology --- organic Rankine cycle system --- zeotropic mixture --- heat exchanger --- low grade heat --- thermodynamic optimization --- method comparison --- micro-ORC --- gear pump --- CFD --- mesh morphing --- pressure pulsation --- cavitation --- dynamic analysis --- energy analysis --- exergy analysis --- organic Rankine cycle --- waste heat recovery --- natural gas engine --- scroll --- opensource CFD --- OpenFOAM --- CoolFOAM --- WOM --- positive displacement machine --- expander --- ORC --- ORC integration technologies --- advanced thermodynamic cycles --- decentralised energy systems --- benzene --- toluene --- cyclopentane --- internal combustion engine --- cogeneration --- district heating --- low sulfur fuels --- regression model --- predictive model --- ship --- techno-economic feasibility --- machinery system optimization --- life cycle assessment --- biomass --- CHP --- carbon footprint of energy production --- Brayton --- environmental impact --- exergy --- life cycle analysis --- performance parameters

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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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Rising pollution, climate change and the depletion of fossil fuels are leading many countries to focus on renewable-based energy conversion systems. In particular, recently introduced energy policies are giving high priority to increasing the use of renewable energy sources, the improvement of energy systems’ security, the minimization of greenhouse gas effect, and social and economic cohesion. Renewable energies’ availability varies during the day and the seasons and so their use must be accurately predicted in conjunction with the management strategies based on load shifting and energy storage. Thus, in order to reduce the criticalities of this uncertainty, the exploitation of more flexible and stable renewable energies, such as the geothermal one, is necessary. Geothermal energy is an abundant renewable source with significant potential in direct use applications, such as in district heating systems, in indirect use ones to produce electricity, and in cogeneration and polygeneration systems for the combined production of power, heating, and cooling energy. This Special Issue includes geothermal energy utilization and the technologies used for its exploitation considering both the direct and indirect use applications.

geothermal power production --- abandoned oil reservoirs --- in situ combustion --- organic Rankine cycle (ORC) --- plunger pump --- centrifugal pump --- pressure drop --- temperature utilization rate --- system generating efficiency --- carbonate geothermal reservoirs --- sustainable geothermal energy exploitation --- southern Italy --- numerical simulation --- dual-loop ORC --- mixture working fluids --- entropy generation --- entransy loss --- exergy loss --- Ground source heat pump --- oval cross-section --- groundwater --- borehole heat exchanger --- CFD --- Sandtank --- granite --- physical characteristics --- cyclic --- thermal treatment --- water cooling --- hybrid renewable polygeneration plant --- micro organic Rankine cycle --- evacuated solar thermal collectors --- photovoltaic panels --- plastic heat exchanger --- Organic Rankine Cycle --- geothermal energy --- shell and tube heat exchanger --- fouling resistance --- mobile thermal energy storage (M-TES) --- phase change material (PCM) --- LCOH --- heat transport --- renewable energy source --- household hybrid system --- dynamic simulation --- economic analysis --- TRNSYS software --- heating and cooling network --- polygeneration system --- geothermal energy community --- ORC --- energy district --- heat pump --- R1234ze --- CO2 --- geothermal --- renewable energy --- historic building --- energy saving --- earth-to-air --- horizontal pipe --- 2D model --- air conditioning --- renewable energy sources --- thermal performances --- energy efficiency --- parametric study --- geothermal resource --- Monte Carlo simulation --- assessment --- thermal reservoir --- North Jiangsu Basin

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The world’s energy demand is still growing, partly due to the rising population, partly to increasing personal needs. This growing demand has to be met without increasing (or preferably, by decreasing) the environmental impact. One of the ways to do so is the use of existing low-temperature heat sources for producing electricity, such as using power plants based on the organic Rankine cycle (ORC) . In ORC power plants, instead of the traditional steam, the vapor of organic materials (with low boiling points) is used to turn heat to work and subsequently to electricity. These units are usually less efficient than steam-based plants; therefore, they should be optimized to be technically and economically feasible. The selection of working fluid for a given heat source is crucial; a particular working fluid might be suitable to harvest energy from a 90 ℃ geothermal well but would show disappointing performance for well with a 80 ℃ head temperature. The ORC working fluid for a given heat source is usually selected from a handful of existing fluids by trial-and-error methods; in this collection, we demonstrate a more systematic method based on physical and chemical criteria.

History of engineering & technology --- adiabatic expansion --- isentropic expansion --- T-s diagram --- working fluid classification --- optimization --- single-screw expander --- vapor–liquid two-phase expansion --- thermal efficiency --- net work output --- heat exchange load of condenser --- cis-butene --- HFO-1234ze(E) --- ORC working fluids --- temperature–entropy saturation curve --- saturation properties --- wet and dry fluids --- ideal-gas heat capacity --- Rankine cycle --- ORC --- biomass --- fluid mixtures --- hydrocarbons --- working fluid --- selection method --- volumetric expander --- thermodynamic analysis --- wet zeotropic mixture --- single screw expander --- organic Rankine cycle --- R441A --- R436B --- R432A --- T–s diagram --- molecular degree of freedom