World Academy of Science, Engineering and Technology
Published January 23, 2010 | Version 6420
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Efficiency of Compact Organic Rankine Cycle System with Rotary-Vane-Type Expander for Low-Temperature Waste Heat Recovery

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This paper describes the experimental efficiency of a compact organic Rankine cycle (ORC) system with a compact rotary-vane-type expander. The compact ORC system can be used for power generation from low-temperature heat sources such as waste heat from various small-scale heat engines, fuel cells, electric devices, and solar thermal energy. The purpose of this study is to develop an ORC system with a low power output of less than 1 kW with a hot temperature source ranging from 60°C to 100°C and a cold temperature source ranging from 10°C to 30°C. The power output of the system is rather less due to limited heat efficiency. Therefore, the system should have an economically optimal efficiency. In order to realize such a system, an efficient and low-cost expander is indispensable. An experimental ORC system was developed using the rotary-vane-type expander which is one of possible candidates of the expander. The experimental results revealed the expander performance for various rotation speeds, expander efficiencies, and thermal efficiencies. Approximately 30 W of expander power output with 48% expander efficiency and 4% thermal efficiency with a temperature difference between the hot and cold sources of 80°C was achieved.

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References

  • H. Nasu, "Waste heat quantity assumption from overall Japan industries," (in Japanese), Energy Conservation Center of Japan, Press Release, August 12, (1997).
  • T. Yamamoto, T. Furuhata, N. Arai, and K. Mori, "Design and testing of the organic Rankine cycle," Energy, Vol. 26, (2001), pp. 239-251.
  • Free Power, "Introduction to Free Power ORC systems," June, (2005), (http://www.freepower.co.uk). Date of access: April 29, 2009.
  • H. Yamaguchi, X. R. Zhang, K. Fujima, M. Enomoto, and N. Sawada, "Solar energy powered Rankine cycle using supercritical CO2," Applied Thermal Engineering, Vol. 26, (2006), pp. 2345-2354.
  • N. Yamada, A. Hoshi, and Y. Ikegami, "Performance simulation of solar-boosted ocean thermal energy conversion plant," Renewable Energy, Vol. 34, (2009), pp. 1752-1758.
  • N. Inoue, T. Takeuchi, A. Kaneko, T. Uchimura, K. Irie, and H. Watanabe, "Development of electric power units driven by waste heat," Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers (in Japanese), Vol. 22, (2005), pp. 357-368.
  • T. Saitoh, N. Yamada, and S.-I. Wakashima, "Solar Rankine cycle system using scroll expander," Journal of Environment and Engineering, Vol. 2, (2007), pp. 708-719.
  • NIST, "Reference Fluid Thermodynamic and Transport Properties Database (REFPROP) Version 8.0," U.S. Department of Commerce, Maryland, (2007).
  • O. Badr, P. W. O'Callaghan, and S. D. Probert, "Rankine-cycle systems for harnessing power from low-grade energy sources," Applied Energy, Vol. 36, (1990), pp. 263-292.