Roberto Grena
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View article: Overcoming Power Limitations of Electric Heating in a Solar Salt Thermal Storage by Microwave Heating
Overcoming Power Limitations of Electric Heating in a Solar Salt Thermal Storage by Microwave Heating Open
The expected increase in energy production from VRE (Variable Renewable Energy) requires a significant increase in energy storage capacity, with thermal storage potentially offering a key contribution. However, heat transfer mechanisms can…
View article: Comparative Techno-Economic Analysis of Parabolic Trough and Linear Fresnel Collectors with Evacuated and Non-Evacuated Receiver Tubes in Different Geographical Regions
Comparative Techno-Economic Analysis of Parabolic Trough and Linear Fresnel Collectors with Evacuated and Non-Evacuated Receiver Tubes in Different Geographical Regions Open
In the context of Concentrated Solar Power (CSP) technology, this paper presents a comparison between the Parabolic Trough Collector (PTC) and the Linear Fresnel Collector (LFC), considering both evacuated and non-evacuated receiver tubes.…
View article: Heat Supply to Industrial Processes via Molten Salt Solar Concentrators
Heat Supply to Industrial Processes via Molten Salt Solar Concentrators Open
About one-third of world energy production is destined to the industrial sector, with process heat accounting for about 70% of this demand; almost half of this quota is required by endothermic processes operating at temperatures above 400 …
View article: Thermal Analysis of Parabolic and Fresnel Linear Solar Collectors Using Compressed Gases as Heat Transfer Fluid in CSP Plants
Thermal Analysis of Parabolic and Fresnel Linear Solar Collectors Using Compressed Gases as Heat Transfer Fluid in CSP Plants Open
This study introduces the use of compressed air as a heat transfer fluid in small-scale, concentrated linear solar collector technology, evaluating its possible advantages over traditional fluids. This work assumes the adoption of readily …
View article: Geometrical Aspects of the Optics of Linear Fresnel Concentrators: A Review
Geometrical Aspects of the Optics of Linear Fresnel Concentrators: A Review Open
Linear Fresnel concentrators (LFR) are widely seen by the scientific community as one of the most promising systems for the production of solar energy via thermal plants or concentrated photovoltaics. The produced energy depends on the opt…
View article: Photo-Thermal Optimization of a Parabolic Trough Collector with Arrayed Selective Coatings
Photo-Thermal Optimization of a Parabolic Trough Collector with Arrayed Selective Coatings Open
This work aims at enhancing the photo-thermal performance of a parabolic trough collector (PTC) system by implementing multiple coatings arrayed along the receiver tube. For this purpose, a lumped-parameter model was developed in the radia…
View article: A Model of Integration between a CSP System and a PV Solar Field Sharing a Solid Particles Two-Tanks Thermal Storage
A Model of Integration between a CSP System and a PV Solar Field Sharing a Solid Particles Two-Tanks Thermal Storage Open
The integration of a CSP tower system with a PV solar field, sharing a thermal energy storage, is modeled and discussed. The tower system uses a new-design solid particle fluidized bed receiver integrated with a thermal storage, where hot …
View article: Ranking nodes in directed networks via continuous-time quantum walks
Ranking nodes in directed networks via continuous-time quantum walks Open
View article: Do we really need a seasonal energy storage? Results for photovoltaic technology in an unfavourable scenario
Do we really need a seasonal energy storage? Results for photovoltaic technology in an unfavourable scenario Open
View article: Ranking nodes in directed networks via continuous-time quantum walks
Ranking nodes in directed networks via continuous-time quantum walks Open
Four new centrality measures for directed networks based on unitary, continuous-time quantum walks (CTQW) in $n$ dimensions -- where $n$ is the number of nodes -- are presented, tested and discussed. The main idea behind these methods cons…
View article: Do We Really Need a Seasonal Energy Storage? Results for Photovoltaic Technology in an Unfavourable Scenario
Do We Really Need a Seasonal Energy Storage? Results for Photovoltaic Technology in an Unfavourable Scenario Open
View article: Quantum hub and authority centrality measures for directed networks based on continuous-time quantum walks
Quantum hub and authority centrality measures for directed networks based on continuous-time quantum walks Open
In this article, we introduce, test and discuss three quantum methods for computing hub and authority centrality scores in directed networks. The methods are based on unitary, continuous-time quantum walks; the construction of a suitable H…
View article: Optimal focal length of primary mirrors in Fresnel linear collectors
Optimal focal length of primary mirrors in Fresnel linear collectors Open
View article: Optimization of the geometry of Fresnel linear collectors
Optimization of the geometry of Fresnel linear collectors Open