There is a growing interest in the electrical energy storage system, especially for matching intermittent sources of renewable energy with customers＇ demand. Furthermore, it is possible, with these system, to level t...There is a growing interest in the electrical energy storage system, especially for matching intermittent sources of renewable energy with customers＇ demand. Furthermore, it is possible, with these system, to level the absorption peak of the electric network （peak shaving） and the advantage of separating the production phase from the exertion phase （time shift）. CAES （compressed air energy storage systems） are one of the most promising technologies of this field, because they are characterized by a high reliability, low environmental impact and a remarkable energy density. The main disadvantage of big systems is that they depend on geological formations which are necessary to the storage. The micro-CAES system, with a rigid storage vessel, guarantees a high portability of the system and a higher adaptability even with distributed or stand-alone energy productions. This article carries out a thermodynamical and energy analysis of the micro-CAES system, as a result of the mathematical model created in a Matlab/Simulink environment. New ideas will be discussed, as the one concerning the quasi-isothermal compression/expansion, through the exertion of a biphasic mixture, that will increase the total system efficiency and enable a combined production of electric, thermal and refrigeration energies. The exergy analysis of the results provided by the simulation of the model reports that more than one third of the exergy input to the system is lost. This is something promising for the development of an experimental device.展开更多
The presence of roads in high steep agricultural systems is often linked with landslides occurrence.This research aims to model multi-temporal overland flow dynamics in a shallow landslides-prone terraced landscape(no...The presence of roads in high steep agricultural systems is often linked with landslides occurrence.This research aims to model multi-temporal overland flow dynamics in a shallow landslides-prone terraced landscape(northern Italy).The combined use of Remotely Piloted Aircraft Systems(RPAS)and photo-grammetric techniques(e.g.,Structure from Motion-SfM)allowed to elaborate multi-temporal high-resolution Digital Elevation Models(DEMs).Hydrological analyses of water flow's depth alterations due to the road presence were carried out adopting the SIMulated Water Erosion model(SIMWE),focusing on different scenarios considering the presence of the road and assuming its absence through a specific DEM smoothing procedure.The possibility to perform multi-temporal hydrological simulations at a hillslope scale so as to analyse the role played by the road in overland flows alteration is still a challenge to be investigated.Results proved the role played by the road in water flows change above the two observed shallow landslides,with respective maximum water depth values equal to 0.18 m and 0.14 m.On the contrary,no-road simulations not revealed significant water flows deviations towards landslides,with water depth values around 0 m,underlining that the absence of the road would avoid relevant changes in water flow paths toward the collapsed surfaces.This work could be a solid starting point for analyse road impact on runoff dynamics and hillslopes stability also at a wider scale,as well as for planning efficient mitigation intervention so as to reduce the occurrence of similar future scenarios.展开更多
文摘There is a growing interest in the electrical energy storage system, especially for matching intermittent sources of renewable energy with customers＇ demand. Furthermore, it is possible, with these system, to level the absorption peak of the electric network （peak shaving） and the advantage of separating the production phase from the exertion phase （time shift）. CAES （compressed air energy storage systems） are one of the most promising technologies of this field, because they are characterized by a high reliability, low environmental impact and a remarkable energy density. The main disadvantage of big systems is that they depend on geological formations which are necessary to the storage. The micro-CAES system, with a rigid storage vessel, guarantees a high portability of the system and a higher adaptability even with distributed or stand-alone energy productions. This article carries out a thermodynamical and energy analysis of the micro-CAES system, as a result of the mathematical model created in a Matlab/Simulink environment. New ideas will be discussed, as the one concerning the quasi-isothermal compression/expansion, through the exertion of a biphasic mixture, that will increase the total system efficiency and enable a combined production of electric, thermal and refrigeration energies. The exergy analysis of the results provided by the simulation of the model reports that more than one third of the exergy input to the system is lost. This is something promising for the development of an experimental device.
文摘The presence of roads in high steep agricultural systems is often linked with landslides occurrence.This research aims to model multi-temporal overland flow dynamics in a shallow landslides-prone terraced landscape(northern Italy).The combined use of Remotely Piloted Aircraft Systems(RPAS)and photo-grammetric techniques(e.g.,Structure from Motion-SfM)allowed to elaborate multi-temporal high-resolution Digital Elevation Models(DEMs).Hydrological analyses of water flow's depth alterations due to the road presence were carried out adopting the SIMulated Water Erosion model(SIMWE),focusing on different scenarios considering the presence of the road and assuming its absence through a specific DEM smoothing procedure.The possibility to perform multi-temporal hydrological simulations at a hillslope scale so as to analyse the role played by the road in overland flows alteration is still a challenge to be investigated.Results proved the role played by the road in water flows change above the two observed shallow landslides,with respective maximum water depth values equal to 0.18 m and 0.14 m.On the contrary,no-road simulations not revealed significant water flows deviations towards landslides,with water depth values around 0 m,underlining that the absence of the road would avoid relevant changes in water flow paths toward the collapsed surfaces.This work could be a solid starting point for analyse road impact on runoff dynamics and hillslopes stability also at a wider scale,as well as for planning efficient mitigation intervention so as to reduce the occurrence of similar future scenarios.
