Jesus D. Ortega
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View article: Thermal Energy Storage: Gaps and Bridges for Concentrating Solar Power Technologies
Thermal Energy Storage: Gaps and Bridges for Concentrating Solar Power Technologies Open
Implementation of thermal energy storage (TES) systems into concentrating solar power (CSP) technologies is paramount, not only to increase their capacity, but also to provide resilience during periods of time without sunlight.While there …
View article: QUANTITATIVE CHARACTERIZATION OF ADVECTIVE LOSSES IN A FALLING PARTICLE RECEIVER
QUANTITATIVE CHARACTERIZATION OF ADVECTIVE LOSSES IN A FALLING PARTICLE RECEIVER Open
Concentrating solar power receivers use a thermal medium for energy storage.For falling particle receivers, ceramic particles are used both as the thermal storage and transfer medium.Inside the receiver described here, a gravity-driven par…
View article: Characterization of Particle and Heat Losses from a High-Temperature Particle Receiver (2<sup>nd</sup> Ed)
Characterization of Particle and Heat Losses from a High-Temperature Particle Receiver (2<sup>nd</sup> Ed) Open
High - temperature particle receivers are being pursued to enable next - generation concentrating solar thermal power (CSP) systems that can achieve higher temperatures (> 700 C) to enable more efficient power cycles, lower overall system …
View article: A simple and fast matlab-based particle size distribution analysis tool
A simple and fast matlab-based particle size distribution analysis tool Open
Particle size distribution is one of the most important physical properties of a particulate sample.Traditional particle-sizing methods to estimate a geometrical particle size distribution employ a sieve analysis (or gradation test), which…
View article: Characterization of Particle and Heat Losses from a High-Temperature Particle Receiver
Characterization of Particle and Heat Losses from a High-Temperature Particle Receiver Open
High-temperature particle receivers are being pursued to enable next-generation concentrating solar thermal power (CSP) systems that can achieve higher temperatures (> 700 °C) to enable more efficient power cycles, lower overall system cos…
View article: Physical applications: fractional Brownian movement applied to the particle dispersion
Physical applications: fractional Brownian movement applied to the particle dispersion Open
Fractional Brownian motion allows you to see the correlation between past data increments in a shift with respect to future increments. Through this important physical property of fractional Brownian motion, it was possible to perform an a…
View article: Fractional Brownian motion and Hurst coefficient in drinking water turbidity analysis
Fractional Brownian motion and Hurst coefficient in drinking water turbidity analysis Open
Brownian motion is a physical phenomenon studied by biologist Robert Brown through which it is possible to describe the random irregular motion of pollen particles suspended in a fluid using the probability of finding a particle at a speci…
View article: Operational modes of a 2.0 MWth chloride molten-salt pilot-scale system
Operational modes of a 2.0 MWth chloride molten-salt pilot-scale system Open
The limit of traditional solar-salt thermal stability is around 600 °C with ambient air as the cover gas. Nitrate molten salt concentrating solar power (CSP) systems are currently deployed globally and are considered to be state-of the art…
View article: On-Sun Tracking Evaluation of a Small-Scale Tensile Ganged Heliostat Prototype
On-Sun Tracking Evaluation of a Small-Scale Tensile Ganged Heliostat Prototype Open
Various ganged heliostat concepts have been proposed in the past. The attractive aspect of ganged heliostat concepts is multiple heliostats are grouped so that pedestals, tracking drives, and other components can be shared, thus reducing t…
View article: Optical Performance Modeling and Analysis of a Tensile Ganged Heliostat Concept
Optical Performance Modeling and Analysis of a Tensile Ganged Heliostat Concept Open
Designs of conventional heliostats have been varied to reduce cost, improve optical performance or both. In one case, reflective mirror area on heliostats has been increased with the goal of reducing the number of pedestals and drives and …
View article: Dynamic load mechanical modelling of a 10 MW tensile ganged heliostat prototype
Dynamic load mechanical modelling of a 10 MW tensile ganged heliostat prototype Open
Heliostat collector fields in central CSP power tower systems comprise approximately 40% of the installed plant cost where primary heliostat components are composed of a pedestal, frame structure, and drives for azimuth and elevation angle…
View article: On-Sun Testing of a High Temperature Bladed Solar Receiver and Transient Efficiency Evaluation Using Air
On-Sun Testing of a High Temperature Bladed Solar Receiver and Transient Efficiency Evaluation Using Air Open
Prior research at Sandia National Laboratories showed the potential advantages of using light-trapping features which are not currently used in direct tubular receivers. A horizontal bladed receiver arrangement showed the best potential fo…
View article: Design and Testing of a Novel Bladed Receiver
Design and Testing of a Novel Bladed Receiver Open
Previous research at Sandia National Laboratories showed the potential advantages of using light-trapping features which are not currently used in direct tubular receivers. A horizontal bladed receiver arrangement showed the best potential…
View article: Mechanical Modal Phenomena of a Ganged Heliostat
Mechanical Modal Phenomena of a Ganged Heliostat Open
Ganged-heliostats have the potential for large cost reductions with enhanced solar collector field optimization. Unlike typical heliostats that require dual axis tracking actuators and a base or foundation, ganged-heliostats can share actu…
View article: Optical and thermal performance of bladed receivers
Optical and thermal performance of bladed receivers Open
Bladed receivers use conventional receiver tube-banks rearranged into bladed/finned structures, and offer better light trapping, reduced radiative and convective losses, and reduced tube mass, based on the presented optical and thermal ana…
View article: Fractal-Like Materials Design with Optimized Radiative Properties for High-Efficiency Solar Energy Conversion
Fractal-Like Materials Design with Optimized Radiative Properties for High-Efficiency Solar Energy Conversion Open
Novel designs to increase light trapping and thermal efficiency of concentrating solar receivers at multiple length scales have been conceived, designed, and tested. The fractal-like geometries and features are introduced at both macro (me…
View article: Calorimetric Evaluation of Novel Concentrating Solar Receiver Geometries With Enhanced Effective Solar Absorptance
Calorimetric Evaluation of Novel Concentrating Solar Receiver Geometries With Enhanced Effective Solar Absorptance Open
Direct solar power receivers consist of tubular arrays, or panels, which are typically tubes arranged side by side and connected to an inlet and outlet manifold. The tubes absorb the heat incident on the surface and transfer it to the flui…
View article: Design and Modeling of Light-Trapping Tubular Receiver Panels
Design and Modeling of Light-Trapping Tubular Receiver Panels Open
Multiple receiver designs have been evaluated for improved optics and efficiency gains including flat panel, vertical-finned flat panel, horizontal-finned flat panel, and radially finned. Ray tracing using SolTrace was performed to underst…
View article: Coupled optical-thermal-fluid modeling of a directly heated tubular solar receiver for supercritical co2 brayton cycle.
Coupled optical-thermal-fluid modeling of a directly heated tubular solar receiver for supercritical co2 brayton cycle. Open
Recent studies have evaluated closed-loop supercritical carbon dioxide (s-CO2) Brayton cycles to be a higher energy density system in comparison to conventional superheated steam Rankine systems. At turbine inlet conditions of 923K and 25 …
View article: Sediment Resuspension and Transport in Water Distribution Storage Tanks
Sediment Resuspension and Transport in Water Distribution Storage Tanks Open
Computational and experimental studies were conducted to better understand conditions that affect particle resuspension and movement in water storage tanks. Parameters that were investigated included inlet/outlet (I/O) line location and di…
View article: Magnetic field flow phenomena in a falling particle receiver
Magnetic field flow phenomena in a falling particle receiver Open
Concentrating solar power (CSP) falling particle receivers are being pursued as a desired means for utilizing low-cost, high-absorptance particulate materials that can withstand high concentration ratios (∼1000 suns), operating temperature…
View article: Fractal-like receiver geometries and features for increased light trapping and thermal efficiency
Fractal-like receiver geometries and features for increased light trapping and thermal efficiency Open
Novel designs to increase light trapping and thermal efficiency of concentrating solar receivers at multiple length scales have been conceived and tested. The fractal-like geometries and features are introduced at both macro (meters) and m…