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Proceedings Papers

Optical Ray-Tracing Performance Modeling of Quartz Half-Shell Tubes Aperture Cover for Falling Particle Receiver

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Julius Yellowhair, Clifford K. Ho
Proc. ASME. ES2019, ASME 2019 13th International Conference on Energy Sustainability, V001T03A012, July 14–17, 2019
Publisher: American Society of Mechanical Engineers
Paper No: ES2019-3927
https://doi.org/10.1115/ES2019-3927
View Paper titled, Optical Ray-Tracing Performance Modeling of Quartz Half-Shell Tubes Aperture Cover for Falling Particle Receiver
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Topics: Modeling, Particulate matter, Quartz, Ray tracing, Shells
Proceedings Papers

Optical Performance Modeling and Analysis of a Tensile Ganged Heliostat Concept

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Julius Yellowhair, Charles E. Andraka, Kenneth M. Armijo, Jesus D. Ortega, Jim Clair
Proc. ASME. ES2019, ASME 2019 13th International Conference on Energy Sustainability, V001T03A013, July 14–17, 2019
Publisher: American Society of Mechanical Engineers
Paper No: ES2019-3933
https://doi.org/10.1115/ES2019-3933
View Paper titled, Optical Performance Modeling and Analysis of a Tensile Ganged Heliostat Concept
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Topics: Modeling, Cables, Mirrors, Shades and shadows, Motors, Stress, Wind, Design, Gravity (Force), Performance evaluation
Proceedings Papers

On-Sun Tracking Evaluation of a Small-Scale Tensile Ganged Heliostat Prototype

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Julius Yellowhair, Kenneth M. Armijo, Jesus D. Ortega, Jim Clair
Proc. ASME. ES2019, ASME 2019 13th International Conference on Energy Sustainability, V001T03A014, July 14–17, 2019
Publisher: American Society of Mechanical Engineers
Paper No: ES2019-3935
https://doi.org/10.1115/ES2019-3935
View Paper titled, On-Sun Tracking Evaluation of a Small-Scale Tensile Ganged Heliostat Prototype
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Topics: Engineering prototypes, Cables, Degrees of freedom, Rotation, Actuators, Algorithms, Plates (structures), Screws
Proceedings Papers

Mechanical Modal Phenomena of a Ganged Heliostat

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Kenneth M. Armijo, Jesus D. Ortega, Adam Moya, Joshua Christian, Gregory Peacock, Charles Andraka, Julius Yellowhair, Jim Clair
Proc. ASME. ES2017, ASME 2017 11th International Conference on Energy Sustainability, V001T05A014, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ES2017-3635
https://doi.org/10.1115/ES2017-3635
View Paper titled, Mechanical Modal Phenomena of a Ganged Heliostat
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Topics: Actuators, Cables, Computer software, Concentrating solar power, Deformation, Design, Errors, Finite element analysis, Gravity (Force), Mirrors
Journal Articles

Design and Characterization of a 7.2 kW Solar Simulator

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Antoine Boubault, Julius Yellowhair, Clifford K. Ho
Journal: Journal of Solar Energy Engineering
Publisher: ASME
Article Type: Research-Article
J. Sol. Energy Eng. June 2017, 139(3): 031012.
Paper No: SOL-15-1457
https://doi.org/10.1115/1.4036411
Published Online: April 25, 2017
View Articletitled, Design and Characterization of a 7.2 kW Solar Simulator
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Topics: Design, Solar energy, Testing, Metals
Journal Articles

Characterization of Particle Flow in a Free-Falling Solar Particle Receiver

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Clifford K. Ho, Joshua M. Christian, David Romano, Julius Yellowhair, Nathan Siegel, Laura Savoldi, Roberto Zanino
Journal: Journal of Solar Energy Engineering
Publisher: ASME
Article Type: Research-Article
J. Sol. Energy Eng. April 2017, 139(2): 021011.
Paper No: SOL-15-1312
https://doi.org/10.1115/1.4035258
Published Online: December 22, 2016
View Articletitled, Characterization of Particle Flow in a Free-Falling Solar Particle Receiver
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Topics: Particulate matter, Flow (Dynamics)
Proceedings Papers

On-Sun Evaluation of the PHLUX Method for Heliostat Beam Characterization

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Julius Yellowhair, Clifford K. Ho
Proc. ASME. ES2016, Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power; Energy Storage; Environmental, Economic, and Policy Considerations of Advanced Energy Systems; Geothermal, Ocean, and Emerging Energy Technologies; Photovoltaics; Posters; Solar Chemistry; Sustainable Building Energy Systems; Sustainable Infrastructure and Transportation; Thermodynamic Analysis of Energy Systems; Wind Energy Systems and Technologies, V001T04A011, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ES2016-59409
https://doi.org/10.1115/ES2016-59409
View Paper titled, On-Sun Evaluation of the PHLUX Method for Heliostat Beam Characterization
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Topics: Density, Errors, Filters, Gages, Instrumentation, Noise (Sound), Reflectance, Resolution (Optics), Solar energy, Water
Proceedings Papers

Design and Modeling of Light-Trapping Tubular Receiver Panels

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Joshua M. Christian, Jesus D. Ortega, Clifford K. Ho, Julius Yellowhair
Proc. ASME. ES2016, Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power; Energy Storage; Environmental, Economic, and Policy Considerations of Advanced Energy Systems; Geothermal, Ocean, and Emerging Energy Technologies; Photovoltaics; Posters; Solar Chemistry; Sustainable Building Energy Systems; Sustainable Infrastructure and Transportation; Thermodynamic Analysis of Energy Systems; Wind Energy Systems and Technologies, V001T04A005, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ES2016-59158
https://doi.org/10.1115/ES2016-59158
View Paper titled, Design and Modeling of Light-Trapping Tubular Receiver Panels
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Topics: Design, Modeling, Fins, Solar energy, Computational fluid dynamics, Ray tracing, Testing, Cooling, Finite element analysis, Heat losses
Proceedings Papers

Performance Evaluation of a High-Temperature Falling Particle Receiver

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Clifford K. Ho, Joshua M. Christian, Julius Yellowhair, Kenneth Armijo, William J. Kolb, Sheldon Jeter, Matthew Golob, Clayton Nguyen
Proc. ASME. ES2016, Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power; Energy Storage; Environmental, Economic, and Policy Considerations of Advanced Energy Systems; Geothermal, Ocean, and Emerging Energy Technologies; Photovoltaics; Posters; Solar Chemistry; Sustainable Building Energy Systems; Sustainable Infrastructure and Transportation; Thermodynamic Analysis of Energy Systems; Wind Energy Systems and Technologies, V001T04A006, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ES2016-59238
https://doi.org/10.1115/ES2016-59238
View Paper titled, Performance Evaluation of a High-Temperature Falling Particle Receiver
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Topics: High temperature, Particulate matter, Performance evaluation, Flow (Dynamics), Design, Temperature, Thermal efficiency, Currents, Oxidation, Stability
Proceedings Papers

Assessment of Photovoltaic Surface Texturing on Transmittance Effects and Glint/Glare Impacts

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Julius Yellowhair, Clifford K. Ho
Proc. ASME. ES2015, Volume 2: Photovoltaics; Renewable-Non-Renewable Hybrid Power System; Smart Grid, Micro-Grid Concepts; Energy Storage; Solar Chemistry; Solar Heating and Cooling; Sustainable Cities and Communities, Transportation; Symposium on Integrated/Sustainable Building Equipment and Systems; Thermofluid Analysis of Energy Systems Including Exergy and Thermoeconomics; Wind Energy Systems and Technologies, V002T11A003, June 28–July 2, 2015
Publisher: American Society of Mechanical Engineers
Paper No: ES2015-49481
https://doi.org/10.1115/ES2015-49481
View Paper titled, Assessment of Photovoltaic Surface Texturing on Transmittance Effects and Glint/Glare Impacts
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Topics: Air traffic control, Control equipment, Glass, Hazards, Polymers, Reflectance, Solar energy, Sunlight, Surface roughness
Proceedings Papers

Characterization of Particle Flow in a Free-Falling Solar Particle Receiver

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Clifford K. Ho, Joshua M. Christian, David Romano, Julius Yellowhair, Nathan Siegel
Proc. ASME. ES2015, Volume 1: Advances in Solar Buildings and Conservation; Climate Control and the Environment; Alternate Fuels and Infrastructure; ARPA-E; Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power; Economic, Environmental, and Policy Aspects of Alternate Energy; Geothermal Energy, Harvesting, Ocean Energy and Other Emerging Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Micro and Nano Technology Applications and Materials, V001T05A013, June 28–July 2, 2015
Publisher: American Society of Mechanical Engineers
Paper No: ES2015-49421
https://doi.org/10.1115/ES2015-49421
View Paper titled, Characterization of Particle Flow in a Free-Falling Solar Particle Receiver
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Topics: Particle flow, Particulate matter, Solar energy, Ceramics, Computer simulation, Concentrating solar power, Density, Flow (Dynamics), Fluids, Storage
Proceedings Papers

Design and Characterization of a 7.2 KW Solar Simulator

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Antoine Boubault, Julius Yellowhair, Clifford K. Ho
Proc. ASME. ES2015, Volume 1: Advances in Solar Buildings and Conservation; Climate Control and the Environment; Alternate Fuels and Infrastructure; ARPA-E; Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power; Economic, Environmental, and Policy Aspects of Alternate Energy; Geothermal Energy, Harvesting, Ocean Energy and Other Emerging Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Micro and Nano Technology Applications and Materials, V001T05A017, June 28–July 2, 2015
Publisher: American Society of Mechanical Engineers
Paper No: ES2015-49472
https://doi.org/10.1115/ES2015-49472
View Paper titled, Design and Characterization of a 7.2 KW Solar Simulator
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Topics: Design, Solar energy, Computer-aided design, Computer software, Concentrating solar power, Metals, Ray tracing, Shapes, Testing
Proceedings Papers

Optical Modeling of Reflectivity Loss Caused by Dust Deposition on CSP Mirrors and Restoration of Energy Yield by Electrodynamic Dust Removal

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Jeremy Stark, Julius Yellowhair, John N. Hudelson, Mark Horenstein, Malay Mazumder
Proc. ASME. ES2014, Volume 1: Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power, Solar Thermochemistry and Thermal Energy Storage; Geothermal, Ocean, and Emerging Energy Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Photovoltaics; Wind Energy Systems and Technologies, V001T02A031, June 30–July 2, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ES2014-6506
https://doi.org/10.1115/ES2014-6506
View Paper titled, Optical Modeling of Reflectivity Loss Caused by Dust Deposition on CSP Mirrors and Restoration of Energy Yield by Electrodynamic Dust Removal
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Topics: Dust, Dust removal, Mirrors, Modeling, Reflectance, Solar energy, Transparency, Electrodes, Reflection, Climate
Proceedings Papers

Evaluation of Solar Optical Modeling Tools for Modeling Complex Receiver Geometries

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Julius Yellowhair, Joshua M. Christian, Clifford K. Ho
Proc. ASME. ES2014, Volume 1: Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power, Solar Thermochemistry and Thermal Energy Storage; Geothermal, Ocean, and Emerging Energy Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Photovoltaics; Wind Energy Systems and Technologies, V001T02A048, June 30–July 2, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ES2014-6620
https://doi.org/10.1115/ES2014-6620
View Paper titled, Evaluation of Solar Optical Modeling Tools for Modeling Complex Receiver Geometries
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Topics: Modeling, Solar energy, Ray tracing, Computation, Design, Errors, Flat plates, Geometry, Preferences, Test facilities
Proceedings Papers

Self-Cleaning Solar Mirrors Using Electrodynamic Dust Shield: Prospects and Progress

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Malay K. Mazumder, Mark N. Horenstein, Jeremy W. Stark, John N. Hudelson, Arash Sayyah, Nitin Joglekar, Julius Yellowhair, Adam Botts
Proc. ASME. ES2014, Volume 1: Combined Energy Cycles, CHP, CCHP, and Smart Grids; Concentrating Solar Power, Solar Thermochemistry and Thermal Energy Storage; Geothermal, Ocean, and Emerging Energy Technologies; Hydrogen Energy Technologies; Low/Zero Emission Power Plants and Carbon Sequestration; Photovoltaics; Wind Energy Systems and Technologies, V001T02A055, June 30–July 2, 2014
Publisher: American Society of Mechanical Engineers
Paper No: ES2014-6696
https://doi.org/10.1115/ES2014-6696
View Paper titled, Self-Cleaning Solar Mirrors Using Electrodynamic Dust Shield: Prospects and Progress
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Topics: Dust, Mirrors, Solar energy, Particulate matter, Reflectance, Energy generation, Parabolic troughs, Particle size, Reflection, Solar collectors
Proceedings Papers

A Cost/Performance Evaluation of Advanced Low-Cost Heliostat Reflective Facets

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Julius Yellowhair, Charles E. Andraka
Proc. ASME. ES2013, ASME 2013 7th International Conference on Energy Sustainability, V001T03A014, July 14–19, 2013
Publisher: American Society of Mechanical Engineers
Paper No: ES2013-18348
https://doi.org/10.1115/ES2013-18348
View Paper titled, A Cost/Performance Evaluation of Advanced Low-Cost Heliostat Reflective Facets
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Topics: Computers, Design, Engineering prototypes, Errors, Glass, Manufacturing, Metals, Mirrors, Modeling, Performance evaluation
Proceedings Papers

Development and Analysis of the Heliostat Focusing and Canting Enhancement Technique for Full Heliostat Alignments

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Kyle Chavez, Evan Sproul, Julius Yellowhair
Proc. ASME. ES2012, ASME 2012 6th International Conference on Energy Sustainability, Parts A and B, 237-246, July 23–26, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ES2012-91039
https://doi.org/10.1115/ES2012-91039
View Paper titled, Development and Analysis of the Heliostat Focusing and Canting Enhancement Technique for Full Heliostat Alignments
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Topics: Computer software, Concentrating solar power, Engineering simulation, Errors, Resolution (Optics), Shapes, Simulation, Solar energy, Test facilities
Proceedings Papers

The Development of the Heliostat Focusing and Canting Enhancement Technique: An Optical Heliostat Alignment Tool for the National Solar Thermal Test Facility

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Evan Sproul, Kyle Chavez, Julius Yellowhair
Proc. ASME. ES2011, ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C, 611-619, August 7–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: ES2011-54268
https://doi.org/10.1115/ES2011-54268
View Paper titled, The Development of the Heliostat Focusing and Canting Enhancement Technique: An Optical Heliostat Alignment Tool for the National Solar Thermal Test Facility
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Topics: Solar energy, Test facilities, Mirrors, Shapes, Algorithms, Computer software, Reflection, Sunlight, Errors, Feedback
Proceedings Papers

Projection of Flat-Plane Fluxmap Images Onto Non-Flat Receiver Surfaces

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Julius Yellowhair, Charles E. Andraka
Proc. ASME. ES2011, ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C, 485-494, August 7–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: ES2011-54153
https://doi.org/10.1115/ES2011-54153
View Paper titled, Projection of Flat-Plane Fluxmap Images Onto Non-Flat Receiver Surfaces
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Topics: Computer software, Design, Engines, Flat plates, Geometry, Product evaluation
Proceedings Papers

AIMFAST: Initial Dish System Alignments Results Using Fringe Reflection Methods

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Charles E. Andraka, Julius Yellowhair, Nolan Finch, Jeff Carlson, Matt Francis, Kirby Hunt, Carl Raffa, Tom Kulaga
Proc. ASME. ES2011, ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C, 695-704, August 7–10, 2011
Publisher: American Society of Mechanical Engineers
Paper No: ES2011-54453
https://doi.org/10.1115/ES2011-54453
View Paper titled, AIMFAST: Initial Dish System Alignments Results Using Fringe Reflection Methods
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Topics: Computer software, Energy / power systems, Engines, Errors, Flux (Metallurgy), Manufacturing systems, Modeling, Reflection, Shapes