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NREL | 1
National Laboratory & Research Institute Panel
National Renewable Energy Lab
Argonne National Lab
Sandia National Labs
Oak Ridge National Lab
Southwest Research Institute
National Energy Technology Lab
Naval Nuclear Lab
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Crescent Dunes Solar Energy Facility, Nevada
sCO2 Power‐Related Research at NREL
Craig TurchiSupercritical CO2 Power Cycles Symposium Pittsburgh, PA March 26‐29, 2018
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NREL | 3
Vision: a secure and sustainable energy future
Recent Wind and PV power purchase agreement (PPA) prices. (These market PPAs reflect the impact of tax credits and other incentives.)
[Wiser, Bolinger, and Seel 2017]
A single Arizona county receives enough solar energy to power the western U.S. interconnect.*
* Cochise County land with < 3% slope, 30% collector area, 16% solar‐to‐electric conversion efficiency
Renewable power prices continue to decline.
The United States has abundant energy resources of many types…
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NREL | 4
Role of CSP: Solar with affordable energy storage
• Multiple hours of energy storage
• Dry cooling• Dispatchable to
grid demandSolarReserve’s Crescent Dunes plant
But, CSP needs greater efficiency to be cost competitive.
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NREL | 5
NREL Activities:sCO2 Cycle Design for CSP
CSP applications require:• Integration with thermal energy
storage (TES) TEScost ∝ mCp∆T
• Dry cooling• Annual performance simulations
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NREL | 6
NREL Activities:Cycle Cooling Options
Alternative cooling options:• Dry cooling• Integration of thermal desalination
for cycle cooling + water productionUsable heat for
thermal desalination
P. Sharan, paper 187
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NREL | 7
NREL Activities:Integration with Molten Salt
TES
CSP/sCO2 Materials:• Characterization of thermal
energy storage materials• Material compatibility and
corrosion in molten salts
PurificationPurification Establish procedures to produce purified salts at commercial scale
Chemical OptimizationChemical
Optimization
CSP CommunityCSP Community
Property DataProperty Data
Handling ProtocolsHandling Protocols
Optimize thermophysical properties for heat transfer and storage efficiency while minimizing corrosion and cost
Validated data in the open literature
For preparation, purification, chemical optimization, and thermophysical properties testing
Balance near‐term CSP industry needs with long‐term objectives to meet SunShot cost targets for Gen3 CSP
High‐temperature Molten Salts
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NREL | 8
NREL Activities:System Value
• Determine CSP value to grid • Optimize CSP dispatch
Black generation profile is a profit‐maximizing dispatch schedule versus a simpler block‐dispatch algorithm
Grid price signal
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NREL | 9
NREL Activities:Gen3 System Development
CSP Gen3 technologies are all designed to mate with sCO2 power
700°C molten salts
Solid particle receivers and thermal storage
Direct‐heated sCO2solar receivers
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www.nrel.gov
NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiencyand Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
Thank you