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Experimental study on an open-drive scroll expander integrated into an ORC (Organic Rankine Cycle) system with R245fa as working fluid

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  • Declaye, Sébastien
  • Quoilin, Sylvain
  • Guillaume, Ludovic
  • Lemort, Vincent

Abstract

The present paper focuses on the experimental characterization of an open-drive scroll expander integrated into an Organic Rankine cycle using R245fa as working fluid. The expander is a commercially available air compressor that was modified to operate in expander mode. The ORC (Organic Rankine Cycle) system is designed for a nominal heat input of 20 kW and a nominal net power output of 1.8 kW. A total of 74 steady-state operating points are measured to evaluate the expander performance over a wide range of conditions. The operating parameters that are varied include the inlet pressure (from 9 to 12 bar), outlet pressure (from 1.5 to 4 bar) and rotational speed (from 2000 to 3500 rpm). The maximum isentropic efficiency and shaft power are, respectively, 75.7% and 2.1 kW. A maximum cycle efficiency of 8.5% is reached for evaporating and condensing temperatures of 97.5 °C and 26.6 °C respectively. For most of the tests, hot water is produced in the condenser and the system therefore behaves as a CHP (combined heat and power). Depending on the water temperature requirement, a power to heat ratio varying between 1.9% and 11.8% is obtained. Water over 50 °C can be produced with a power to heat ratio higher than 8%.

Suggested Citation

  • Declaye, Sébastien & Quoilin, Sylvain & Guillaume, Ludovic & Lemort, Vincent, 2013. "Experimental study on an open-drive scroll expander integrated into an ORC (Organic Rankine Cycle) system with R245fa as working fluid," Energy, Elsevier, vol. 55(C), pages 173-183.
    • Handle: RePEc:eee:energy:v:55:y:2013:i:c:p:173-183
    DOI: 10.1016/j.energy.2013.04.003
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    References listed on IDEAS

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    1. Clemente, Stefano & Micheli, Diego & Reini, Mauro & Taccani, Rodolfo, 2012. "Energy efficiency analysis of Organic Rankine Cycles with scroll expanders for cogenerative applications," Applied Energy, Elsevier, vol. 97(C), pages 792-801.
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    3. Manolakos, D. & Kosmadakis, G. & Kyritsis, S. & Papadakis, G., 2009. "Identification of behaviour and evaluation of performance of small scale, low-temperature Organic Rankine Cycle system coupled with a RO desalination unit," Energy, Elsevier, vol. 34(6), pages 767-774.
    4. Badr, O. & O'Callaghan, P.W. & Probert, S.D., 1985. "Multi-vane expanders: Geometry and vane kinematics," Applied Energy, Elsevier, vol. 19(3), pages 159-182.
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