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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

musculoskeletal modeling --- rehabilitation --- neuromechanics --- neurorehabilitation --- neuromusculoskeletal modeling --- assistive devices --- predictive dynamic simulation --- biomechatronics

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This work investigates a real biomass plant for cogenerative applications in a public building. First of all, the dry cooler, the biomass boiler, the heat exchangers, the natural gas boilers, the pumps, the pipes, the ORC and the building are implemented individually. The results of each model are compared with the product data to validate the models. Once the modeling of the whole power plant is done, two different aspects are studied to improve its energy efficiency and its profitability. On the one hand, different control logics are tested. On the other hand, different levels of temperature are investigated. After having determined the optimal control strategy and the optimal working temperature, an economical study is finally made to determine in which situations the power plant has economical benefits. All the results are analyzed in detail and some suggestions are given at the end to have a profitable and energy efficient power plant

ORC --- Biomass --- Control Strategies --- Dry Cooler --- Dynamic Simulation --- Ingénierie, informatique & technologie > Energie

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The aim of the present work is the mathematical modeling of solid bowl centrifuges for the dynamic simulation of separation processes in real time. The developed compartment model couples the residence time behavior with the material properties and thus allows a time and space-resolved simulation for solid bowl centrifuges. The profound insights into the separation process open up not only a better design, but also new fields of application such as the dynamic flowchart simulation.

Systemverhalten --- Solid Bowl Centrifuges --- System Behaviour --- Vollmantelzentrifugen --- Mathematische Modellierung --- Dynamische Simulation --- Solid-Liquid Separation --- Mathematical modelling --- Mechanische Flüssigkeitsabtrennung --- Dynamic Simulation

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La recherche d’efficacité énergétique est au centre des préoccupations de la société actuelle. Les bâtiments d’intérêt architectural de la seconde moitié du XXe siècle constituent une part importante de notre patrimoine immobilier et la question suivante émerge : comment rénover ce patrimoine bâti pour atteindre les performances énergétiques actuelles ? Les enjeux de ce travail consistent donc à proposer des solutions de rénovation pour un bâtiment d’intérêt patrimonial de l’Université de Liège : la Maison Strebelle. Pour développer ces propositions, la méthodologie utilisée se base sur deux approches complémentaires. Une section descriptive souligne l’évolution architecturale du site et de la construction. Une section analytique se base sur la réalisation d’un audit énergétique et thermographique pour créer une modélisation thermique dynamique du bâtiment. Deux scénarios de rénovation sont implémentés et comparés. Des détails constructifs, une analyse sur le confort, un dimensionnement de l’éclairage et du système de chauffage sont dressés et permettent d’estimer les coûts de rénovation des configurations retenues. Les résultats indiquent que les performances de la construction peuvent être largement améliorées et respecter les critères qui définissent un bâtiment passif aujourd’hui. La consommation en énergie primaire peut être réduite de plus de 60 [%], les performances de l’enveloppe peuvent être améliorées de près de 80 [%], pour des coûts relativement faibles. Ce travail ne fournit pas une solution univoque mais bien une méthodologie pouvant amener à une rénovation cohérente. Il est dédié aux architectes et constructeurs, recherchant des solutions pour des bâtiments semblables, construits à la même époque.

Rénovation énergétique --- Audit --- Modélisation --- Simulation --- DesignBuilder --- Sart Tilman --- Architecture moderne --- Audit --- Dynamic Simulation Modelling --- DesignBuilder --- Sart Tilman --- Modern architecture --- Energy efficiency --- Ingénierie, informatique & technologie > Architecture

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A heat pump system can produce an amount of heat energy that is greater than the amount of energy used to run the heat pump system. Thus, a heat pump system is considered to be a machine system that can use energies efficiently, as is the load leveling air-conditioning system utilizing unutilized energies at high levels. Adaptations of gas turbines for industrial, utility, and marine-propulsion applications have long been accepted as means for generating power with high efficiency and ease of maintenance. Cogeneration with gas turbine is frequently defined as the sequential production of useful thermal energy and shaft power from a single energy source. For applications that generate electricity, the power can either be used internally or supplied to the utility grid. This Special Issue intends to provide an overviews of the existing knowledge related with various aspects of “Small-Scale Energy Systems with Gas Turbines and Heat Pumps”, and contributions on, but not limited to the following subjects were encouraged: wake of stator vane to improve sealing effectiveness; gas turbine cycle with external combustion chamber for prosumer and distributed energy systems; computational simulation of gas turbine engine operating with different blends of biodiesel; experimental methodology and facility for the engine performance and emissions evaluation using jet and biodiesel blends; experimental analysis of an air heat pump for heating service; hybrid fuel cell-Brayton cycle for combined heat and power; design analysis of micro gas turbines in closed cycles. Seven papers were published in the Special Issue out of a total of 12 submitted.

History of engineering & technology --- wave-shaped rim seal --- sealing effectiveness --- radial seal --- gas turbine --- computational fluid dynamics --- biofuels --- sustainable power generation --- microturbines --- gas turbine engine --- two-spool turboprop engine --- PT6A engine --- aero-thermal model --- Matlab-Simulink --- bio-diesel --- start-up transient --- biodiesel --- turbojet --- energy performance --- emissions --- aviation --- hardware-in-the-loop --- heat pumps --- dynamic simulation --- experimental performances --- control strategy --- partial loads --- on-off cycles --- building dynamics --- building-heating system coupling --- supercritical CO2 --- combined heat and power --- flame-assisted fuel cells --- carbon sequestration --- solid oxide fuel cell --- closed cycle gas turbine --- different working fluids --- thermodynamic analysis --- design of turbines --- design of compressors