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Comparison of Rankine cycle and trilateral flash cycle for power production from low temperature heat sources.

Number: pap. 1286

Author(s) : ROHDE D., HAGEN B. A. L., TRAEDAL S., et al.

Summary

The performance of the Rankine Cycle (RC) and the Trilateral Flash Cycle (TFC) were compared for power production from sensible low temperature heat sources. Air was chosen as heat source fluid with a mass flow of 10 kg/s and temperatures of 100, 150, and 200°C. Water was chosen as heat sink with a temperature of 20°C. Butane, isopentane, and propane were chosen as natural working fluids and were compared to three commonly used HFO/HFCs as benchmark. The power cycles were optimized for maximum net power for a limited total heat exchanger area, and with a variable efficiency for the TFC's two-phase expander. The TFC reached higher maximum power outputs than the RC for the 100°C case. However, the required heat exchanger area and expander outlet volume flow rate were significantly higher for the TFC, indicating a larger and more expensive system. The differences in system size and performance decreased for the higher heat source inlet temperatures. The natural working fluids showed similar performance compared to the benchmark refrigerants.

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  • Original title: Comparison of Rankine cycle and trilateral flash cycle for power production from low temperature heat sources.
  • Record ID : 30023665
  • Languages: English
  • Source: 13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018). Proceedings. Valencia, Spain, June 18-20th 2018.
  • Publication date: 2018/06/18
  • DOI: http://dx.doi.org/10.18462/iir.gl.2018.1286

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