Clifford K. Ho
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View article: A very rare event of sand/dust weather in Hong Kong in late spring in 2025 – observational and forecasting aspects
A very rare event of sand/dust weather in Hong Kong in late spring in 2025 – observational and forecasting aspects Open
View article: Heat transfer coefficients of moving particle beds from flow-dependent thermal conductivity and near-wall resistance
Heat transfer coefficients of moving particle beds from flow-dependent thermal conductivity and near-wall resistance Open
View article: CSP Design Study for Sandia National Laboratories and Kirtland Air Force Base
CSP Design Study for Sandia National Laboratories and Kirtland Air Force Base Open
This report provides a design study to produce 100% carbon-free electricity for Sandia NM and Kirtland Air Force Base (KAFB) using concentrating solar power (CSP). CSP plant designs of 50 MW and 100 MW are assessed to meet the electricity …
View article: Micromechanical origin of heat transfer to granular flow
Micromechanical origin of heat transfer to granular flow Open
Heat transfer across a granular flow is comprised of two resistances in series : near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contri…
View article: Systems and methods for shielding falling particles within a solar thermal falling particle receiver
Systems and methods for shielding falling particles within a solar thermal falling particle receiver Open
Systems and methods for falling particle receivers are disclosed that include shield or deflector structures around the receiver aperture to reduce wind effects and/or heat losses from the falling particles. External and internal structure…
View article: Heat Transfer Coefficients of Moving Particle Beds from Flow-Dependent Particle Bed Thermal Conductivity and Near-Wall Resistance
Heat Transfer Coefficients of Moving Particle Beds from Flow-Dependent Particle Bed Thermal Conductivity and Near-Wall Resistance Open
Determination of heat transfer coefficients for flowing packed particle beds is essential to the design of particle heat exchangers, and other thermal processes. While such dense granular flows fall into the well-known plug-flow regime, th…
View article: Round Robin Test of Absorptance and Emittance of Particles for CSP
Round Robin Test of Absorptance and Emittance of Particles for CSP Open
Precise knowledge of particle optical properties is crucial to the advancement and success of directly-irradiated particle receiver technologies. This work presents the results of a Round Robin Test (RRT) that was conducted between seven l…
View article: Cyclic Thermal and Structural Testing of a Hot Particle Storage Bin
Cyclic Thermal and Structural Testing of a Hot Particle Storage Bin Open
Thermal energy storage is a key element in concentrating solar energy systems. In 2017 a Roadmap toward a third-generation system that could meet the SunSHOT goals of 0.06 $/kWe recommended increasing temperatures to > 700° C for heat tran…
View article: Systems and methods for particle-enhanced dry heat rejection and thermal storage
Systems and methods for particle-enhanced dry heat rejection and thermal storage Open
View article: Particle Receiver Models for Systems Analysis
Particle Receiver Models for Systems Analysis Open
Particle receivers are gaining importance in the field of Concentrating Solar Power (CSP) due to the high temperature that particles can achieve without degradation. Several researchers are studying the potential of this technology by mean…
View article: Seasonal Performance Characterization of a Gen3 Particle-Based Concentrating Solar Plant With a Spatially Resolved Transient Thermal Storage Model
Seasonal Performance Characterization of a Gen3 Particle-Based Concentrating Solar Plant With a Spatially Resolved Transient Thermal Storage Model Open
Particle-based Gen3 Concentrating Solar Power (CSP) can be paired with high-temperature power cycles (>700 °C) and can have built-in long duration (≥10 hours) thermal energy storage if the working particles are stored properly in thermal e…
View article: Computational Fluid Dynamics Modeling of Solar Thermal Dry Reforming of Methane in a Parabolic Trough
Computational Fluid Dynamics Modeling of Solar Thermal Dry Reforming of Methane in a Parabolic Trough Open
Computational fluid dynamics simulations of solar-thermal dry reforming of methane using a parabolic trough configuration were performed. Parametric simulations of different combinations of gas flow rate, receiver tube emissivity, and geom…
View article: Falling particle solar receivers
Falling particle solar receivers Open
Falling particle solar receivers, systems, and methods are disclosed that include one non-linear falling particle curtain or two or more falling particle curtains within a solar receiver that receives incident solar radiation. The particle…
View article: Magnetic field falling particle solar receiver systems and methods
Magnetic field falling particle solar receiver systems and methods Open
Systems and methods that increase the residence time of particles falling through a solar receiver using an induced magnetic field to suspend or slow down and/or alter the flight path of the particles falling through the concentrated beam …
View article: Micromechanical Origin of Heat Transfer to Granular Flow
Micromechanical Origin of Heat Transfer to Granular Flow Open
Heat transfer to a granular flow is comprised of two resistances in series: near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contributio…
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: Radial particle-based terrestrial thermocline for high temperature thermal storage
Radial particle-based terrestrial thermocline for high temperature thermal storage Open
A system or method for thermal storage includes a recess or containment unit having a first storage layer and a second storage layer comprising a permeable filler material. An intermediate layer is disposed between the storage layers. A pr…
View article: Computational Fluid Dynamics Modeling of Solar Thermal Dry Reforming of Methane in a Parabolic Trough (paper).
Computational Fluid Dynamics Modeling of Solar Thermal Dry Reforming of Methane in a Parabolic Trough (paper). Open
View article: Experimental testing and computational modeling of a radial packed bed for thermal energy storage
Experimental testing and computational modeling of a radial packed bed for thermal energy storage Open
View article: Falling particle receiver systems with mass flow control
Falling particle receiver systems with mass flow control Open
The present disclosure is directed to systems and methods to control particle mass flow rate in solar receivers and associated heat exchangers based on feedback from one or more temperatures of particles in the system.
View article: Computational Fluid Dynamics Simulations to Assess Spatial Variability and Optimal Ventilation Scenarios for Biological Laboratory Exposures
Computational Fluid Dynamics Simulations to Assess Spatial Variability and Optimal Ventilation Scenarios for Biological Laboratory Exposures Open
Designing a BSL-2 room with ventilation and airflow patterns that maximize through-flow conditions to the return/exhaust vents and minimize dispersion and mixing throughout the room is, therefore, recommended. CFD simulations can also be u…
View article: Benchmark and analysis of a particle receiver 1D model
Benchmark and analysis of a particle receiver 1D model Open
This study presents a one-dimensional (1D) model for free-falling particle receivers able to be integrated into system models thanks to its simplicity and agreement with high fidelity simulations. The receiver thermal efficiencies calculat…
View article: Alignment and focus of mirrored facets of a heliosat
Alignment and focus of mirrored facets of a heliosat Open
Various technologies pertaining to aligning and focusing mirrored facets of a heliostat are described herein. Updating alignment and/or focus of mirrored facets is undertaken through generation of a theoretical image, wherein the theoretic…
View article: Multi-stage falling particle receivers
Multi-stage falling particle receivers Open
The present disclosure is directed to multi-stage falling particle receivers and methods of falling particle heating. As the particles fall through the receiver, the particles are periodically collected and released by flow retarding devic…
View article: Long range heliostat target using array of normal incidence pyranometers to evaluate a beam of solar radiation
Long range heliostat target using array of normal incidence pyranometers to evaluate a beam of solar radiation Open
Various technologies described herein pertain to evaluating a beam reflected by a heliostat. A portable target that has an array of sensors mounted thereupon is configured to capture the beam reflected by the heliostat. The sensors in the …
View article: Bladed solar thermal receivers for concentrating solar power
Bladed solar thermal receivers for concentrating solar power Open
A bladed solar thermal receiver for absorbing concentrated sunlight is disclosed. The receiver includes a plurality of panels arranged in a bladed configuration for absorbing sunlight. The bladed configurations can be radial or planar. The…
View article: Portable vapor diffusion coefficient meter
Portable vapor diffusion coefficient meter Open
An apparatus for measuring the effective vapor diffusion coefficient of a test vapor diffusing through a sample of porous media contained within a test chamber. A chemical sensor measures the time-varying concentration of vapor that has di…
View article: Solar glare hazard analysis tool on account of determined points of time
Solar glare hazard analysis tool on account of determined points of time Open
Technologies pertaining to determining when glare will be perceived by a hypothetical observer from a glare source and the intensity of glare that will be perceived by the hypothetical observer from the glare source are described herein. A…
View article: Airfoil-shaped micro-mixers for reducing fouling on membrane surfaces
Airfoil-shaped micro-mixers for reducing fouling on membrane surfaces Open
An array of airfoil-shaped micro-mixers that enhances fluid mixing within permeable membrane channels, such as used in reverse-osmosis filtration units, while minimizing additional pressure drop. The enhanced mixing reduces fouling of the …
View article: Circular chemiresistors for microchemical sensors
Circular chemiresistors for microchemical sensors Open
A circular chemiresistor for use in microchemical sensors. A pair of electrodes is fabricated on an electrically insulating substrate. The pattern of electrodes is arranged in a circle-filling geometry, such as a concentric, dual-track spi…