1 / 25

Organic Rankine Cycle

Organic Rankine Cycle. By John Yee. Introduction. Organic Rankine Cycle ( ORC) Same working principle as Rankine cycle Organic – pentane, propane, ammonia, and coolants Uses for ORC Low-grade heat waste recovery. Introduction.

quennell-poirier
Download Presentation

Organic Rankine Cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Organic Rankine Cycle By John Yee

  2. Introduction • Organic Rankine Cycle (ORC) • Same working principle as Rankine cycle • Organic – pentane, propane, ammonia, and coolants • Uses for ORC • Low-grade heat waste recovery

  3. Introduction • Energy generation is conventionally done using Rankine cycle with steam • Water needs to be superheated to ~600C to prevent condensation during expansion. • Organic fluids • Evaporation at lower temperatures and pressures • Lower temperature of waste heat can be used

  4. Introduction • Energy generation from temperatures as low as 80C to 100C is possible • Carnot efficiency:

  5. Biomass Cogeneration Plant - Analysis • Utilizes wastes (wood shavings, barks, sawing, chips) of a big sawmill • Thermal and electrical energy • Thermal heat and hot water • Nearby schools and hospital

  6. Biomass Cogeneration Plant - Analysis

  7. Biomass Cogeneration Plant - Analysis • Case 1: Max energy production ~5MW • Electrical efficiency: 15.5% • Net electrical + useful thermal: 33% • Case 2: Max thermal load • Electrical efficiency: 9.5% • Net electrical + useful thermal: 71.8% • Similar systems have appeared in the lumber industry

  8. Trigeneration system with ORC • Trigeneration – combined cooling, heating, and energy generation • Heating: Condenser Q,out • Cooling: Single-effect absorption chiller • mixture of lithium-bromide (Li-Br) and water.

  9. Trigeneration system with ORC

  10. Trigeneration system with ORC

  11. Trigeneration system with ORC • ORC working fluid • Octane(C8H18): Boiling point 125C • Overall efficiency: ~76% • Electrical efficiency: 15% • Ratio Electrical:Cooling: ~4 • Ratio Electrical:Heating: ~0.2

  12. Low Temperature Geothermal • Geothermal heat sources vary in temperatures from 50 to 350C. • High-temp >220C are most suitable for commerical production of electricity with dry steam and flash steam systems. • <220C is most commonly available.

  13. Low Temperature Geothermal

  14. Low Temperature Geothermal

  15. Low Temperature Geothermal

  16. Internal Combustion Engine with ORC • Commercial cogeneration using natural gas

  17. Internal Combustion Engine with ORC

  18. Internal Combustion Engine with ORC

  19. Internal Combustion Engine with ORC • Few common working fluids with different characteristics modeled

  20. Internal Combustion Engine with ORC • Overall efficiency increase of ~5% • 41.8% -> 47.1%

  21. Low Temperature Solar with ORC Analysis • Low temperature thermal electric generation • Non-tracking concentrated solar collectors • 180-200C • Working fluid: HCFC-123 • Short half life

  22. Low Temperature Solar with ORC Analysis

  23. Low Temperature Solar with ORC Analysis • Irradiation: 750 W/m2

  24. Low Temperature Solar with ORC Analysis

  25. Bibliography • Al-Sulaiman, Fahad. “Performance comparison of three trigeneration systems using organic rankine cycles”. Energy, vol. 36, pgs. 5741-5754. June 2011. • Guo, Tao, Huaixin Wang and Shengjun Zhang. “Comparative analysis of natural and conventional working fluids for use in transcriticalRankinecycle using low-temperature geothermal source”. Int. J. Energy Res, vol. 35, pgs. 530–544. May 2010. • Pei, Gang, Jing Li, and JieJi. “Analysis of low temperature solar thermal electric generation using regenerative Organic RankineCycle”. Applied Thermal Engineering, vol. 30, issues 8-9, pgs. 998-1004. June 2010. • Stoppato, Anna. “Energetic and economic investigation of the operation management of an Organic RankineCycle cogeneration plant”. Energy, vol. 41, n. 1, pgs. 3-9. May 2012. • Vaja, Iacopo, and AgostinoGambarotta. “Internal Combustion Engine (ICE) bottoming with Organic Rankine Cycles (ORCs)”. Energy, vol. 35, pgs 1084-1093. July 2009.

More Related