This study presents the potential of ammonia as a working fluid in transcritical Rankine cycle for power generation using both high and low temperature heat sources. Higher heat capacity value and superior heat transfer properties of ammonia compared to water are the motivating factors behind its use as a working fluid. A thermodynamic analysis for the ammonia based transcritical Rankine cycle and its comparison with the water based Rankine cycle is presented. Analyses with several cycle modifications are also presented to study the thermal efficiency augmentation. It is observed that an optimum high side pressure exists for near critical operation. In case of low temperature heat sources such as solar energy or waste heat, where water based systems are not suitable, ammonia based Rankine cycle is applicable with attractive thermal efficiency, although cycle modification is not possible. The results with high temperature heat source such as boiler or nuclear reactor, where the turbine outlet is in superheated zone, show that simple ammonia systems yield lower efficiency than water, although a recompression cycle with regenerative heat exchangers exhibits higher efficiency than water. Significant thermal efficiency improvement can be achieved by increasing the high side cycle pressure. Recompression Rankine cycle can be a potential alternative with proper design measures taken to avoid toxicity and flammability.
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ASME 2008 Power Conference
July 22–24, 2008
Lake Buena Vista, Florida, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4832-9
PROCEEDINGS PAPER
Analysis and Optimization of an Ammonia Based Transcritical Rankine Cycle for Power Generation
Jahar Sarkar,
Jahar Sarkar
Institute of Technology-BHU, Varanasi, India
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Souvik Bhattacharyya
Souvik Bhattacharyya
Indian Institute of Technology - Kharagpur, Kharagpur, India
Search for other works by this author on:
Jahar Sarkar
Institute of Technology-BHU, Varanasi, India
Souvik Bhattacharyya
Indian Institute of Technology - Kharagpur, Kharagpur, India
Paper No:
POWER2008-60097, pp. 673-677; 5 pages
Published Online:
July 8, 2009
Citation
Sarkar, J, & Bhattacharyya, S. "Analysis and Optimization of an Ammonia Based Transcritical Rankine Cycle for Power Generation." Proceedings of the ASME 2008 Power Conference. ASME 2008 Power Conference. Lake Buena Vista, Florida, USA. July 22–24, 2008. pp. 673-677. ASME. https://doi.org/10.1115/POWER2008-60097
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