1. 1 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Thermographic IR Flux Measurements in Concentrated Solar Power Fields February 26, 2014

2. 2 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Presentation Outline Technology overview Current projects Flux measurements with thermographic camera

3. 3 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Brightsource Concentrated Solar Power Technologies HELIOSTATS OPTIMIZATION / CONTROL SOFTWARE STORAGE AIR-COOLED CONDENSER AUXILIARY GAS- FIRED BOILER TURBINE SOLAR RECEIVER / BOILER

4. 4 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Presentation Outline Technology overview Current projects Flux measurements with thermographic camera

5. 5 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved.  EOR-Enhanced Oil Recovery  4K HL 29MW Thermal  Operational for 2 years Coalinga

6. 6 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved.  3 Solar Fields.  170K HL 392MW electrical  Operational for 2 months Ivanpah: World’s Largest Solar Thermal Project

7. 7 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved.  1 Solar Field.  50K HL 121MW electrical  Operational within 2.5 years Ashalim

8. 8 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Presentation Outline Technology overview Current projects Flux measurements with thermographic camera

9. 9 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Receiver Radiative Flux Solar Spectrum radiation from Solar Field absorbed by receiver (high absorptivity) Black Body radiation, radiated by receiver (high emissivity)

10. 10 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved.  Emissivity variations.  Changing atmospheric conditions. ( humidity+ visibility)  Camera in outdoor environment. IR accuracies difficulties

11. 11 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Thermodynamic model IR camera (ε, ambient T, wind) Process data Net Heat transfer rate

12. 12 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Thermodynamic model Heat Transfer Coefficient. fluid status dependent Heat Transfer Coefficient. fluid status dependent Known material and geometry Measured offline in a lab

13. 13 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Flux calculation process

14. 14 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. Measured Flux Expected Flux Flux calculation results

15. 15 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved.  the IR camera has a constant view of all the boiler. Can detect process problems Before drum circulation After drum circulation Additional IR uses

16. 16 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. the IR cameras are a critical component in the operation of the Concentrated Solar Power Fields as part of the Flux management of the Solar Field. Conclusion

17. 17 Proprietary & Confidential © 2014 BrightSource Energy, Inc. All rights reserved. brightsourceenergy.com Thanks: SBMS team- Gilad Naor and Ido Segev EO team- Slava Pekarsky Process team- Dr. Joshua Golbert