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Publication Title | Technoeconomic Study of Solarized Power Cycles

Organic Rankine Cycle

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A joint India-U.S. research consortium funded under the Joint Clean Energy Research & Development Center (JCERDC)

Scientific Achievement:

Performed the first comprehensive technoeconomic analysis of alternative solar- driven supercritical CO2 (s-CO2) power cycles.

Significance and Impact:

Identified trade-offs in cost and performance among components in both concentrating solar power (CSP) and s-CO2 power cycles to determine optimal configuration with lowest cost and greatest performance.

Research Details:

• Higher cycle efficiencies (nearly 50%) resulting from recuperation reduce required thermal input and costs of heliostat field and receiver.

• Lower ∆T across the primary heater (CSP source) resulting from recuperation increased required mass flow rate and costs of heat-transfer/storage media, but resulting cost increase was relatively small.

• Recuperated simple, recompression, and partial cooling s-CO2 cycles yielded the lowest overall costs.

Publication: C. Ho, M. Carlson, P. Garg, and P. Kumar, “Cost and performance tradeoffs of alternative solar-driven supercritical CO2 power cycles,” Proceedings of the ASME 2015 Power and Energy Conversion Conference, San Diego, June 28–July 2, 2015.

Contact: Dr. Cliff Ho, ckho@sandia.gov

Indirect sCO2 Receiver

Hot Storage

Turbine Re- Compressor

HX

Main Compressor

G

Cold Storage

High -T

Low -T

Gas Recuperator Recuperator Cooler

Heliostat Field

Solarized s-CO2 recompression power cycle with thermal storage.

Table of solar and power block costs for alternative s-CO2 power cycles. SCBC = Simple Closed Brayton Cycle; RCBC = Recompression Closed Brayton Cycle; CCBC = Cascaded Closed Brayton Cycle; CBI = Combination Bifurcation with Intercooler

SCBC

Recuperated SCBC

RCBC

CCBC

CBI

Concentrating Solar Costs ($/kWe)

7,210

2,840

2,930

4,170

2,730

Power Block Costs ($/kWe)

1,485

898

1,002

1,583

1,095

Total Costs ($/kWe)

8,690

3,730

3,930

5,750

3,830

Image | Technoeconomic Study of Solarized Power Cycles



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