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Journal Articles

High Temperature Industrial-Scale CO 2 Heat Pumps: Thermodynamic Analysis and Pilot-Scale Testing

Accepted Manuscript
Timothy Held, Jason Miller, Jason Mallinak, Luke Magyar
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1703
https://doi.org/10.1115/1.4068029
Published Online: March 1, 2025
View Article titled, High Temperature Industrial-Scale CO 2 Heat Pumps: Thermodynamic Analysis and Pilot-Scale Testing
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Topics: Carbon dioxide, Heat pumps, High temperature, Testing, Refrigerants, Temperature, Architecture, Cycles, Heat, Heating
Journal Articles

Compressor Development for CO 2 -Based Pumped Thermal Energy Storage Systems

Timothy J. Held, Jason Miller, Kyle Sedlacko, Joshua Cameron, Scott Morris, Jeongseek Kang, Mark Turner
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. September 2025, 147(9): 091014.
Paper No: GTP-24-1701
https://doi.org/10.1115/1.4067449
Published Online: January 29, 2025
View Article titled, Compressor Development for CO 2 -Based Pumped Thermal Energy Storage Systems
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Topics: Carbon dioxide, Compressors, Design, Pressure, Temperature, Reservoirs, Cycles
Proceedings Papers

Pilot-Scale Testing of a Transcritical CO 2 -Based Pumped Thermal Energy Storage (PTES) System

Timothy J. Held, Jason Miller, Jason Mallinak, Vamshi Avadhanula, Luke Magyar
Proc. ASME. GT2024, Volume 6: Education; Electric Power; Energy Storage; Fans and Blowers, V006T09A016, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-129211
https://doi.org/10.1115/GT2024-129211
View Paper titled, Pilot-Scale Testing of a Transcritical CO 2 -Based Pumped Thermal Energy Storage (PTES) System
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Topics: Carbon dioxide, Testing, Thermal energy storage, Reservoirs, Cycles, Low temperature, Thermal energy, Fluids, Heat engines, Heat pumps
Proceedings Papers

Performance and Control of the Primary Heat Exchanger in a Closed-Loop sCO 2 Brayton Cycle With Solid Fuel Combustion

Brian Schooff, Rajarshi Roy, Fletcher Smith, Daniel Tree, Brian D. Iverson, Andrew Chiodo, Timothy J. Held, Jason Miller, Brett Bowan, Kyle Sedlacko, Michael Johnson, Scott Montgomery, Andrew Fry
Proc. ASME. GT2024, Volume 11: Supercritical CO2, V011T28A020, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-126013
https://doi.org/10.1115/GT2024-126013
View Paper titled, Performance and Control of the Primary Heat Exchanger in a Closed-Loop sCO 2 Brayton Cycle With Solid Fuel Combustion
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Topics: Brayton cycle, Combustion, Fuels, Heat exchangers
Proceedings Papers

Compressor Development for CO 2 -Based Pumped Thermal Energy Storage (PTES) Systems

Timothy J. Held, Jason Miller, Kyle Sedlacko, Joshua Cameron, Scott Morris, Jeongseek Kang, Mark Turner
Proc. ASME. GT2024, Volume 11: Supercritical CO2, V011T28A013, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-124070
https://doi.org/10.1115/GT2024-124070
View Paper titled, Compressor Development for CO 2 -Based Pumped Thermal Energy Storage (PTES) Systems
Open the PDF for Compressor Development for CO 2 -Based Pumped Thermal Energy Storage (PTES) Systems in another window
Topics: Carbon dioxide, Compressors, Thermal energy storage, Cycles, Design, Conceptual design, Pressure, Reservoirs, Engines, Fluid density