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Experimental investigation on an ORC twin-screw expander with an emphasis on its suction process.

Number: pap. 1145

Author(s) : TIAN Y., WANG C., HU F., et al.

Summary

Organic Rankine Cycle (ORC) is an effective and promising technology to recover low-grade waste heat and output electricity. As a key component in an ORC system, the expander’s performance significantly affects the whole system’s efficiency. Twin-screw expander is widely employed for its compact structure, reliability, two-phase tolerance and high efficiency. To investigate the characteristics of twin-screw expander, a test bench was set up in a laboratory. R245fa was selected as the working fluid. Pressure sensors with high sensitivity and accuracy were installed at appropriate locations in the expander casing to monitor the p-V indicator diagrams. The expander’s p-V indicator diagrams and operating parameters were recorded under different operating conditions. The effects of rotational speed, suction and discharge pressure on the expander’s suction pressure drop and filling factor were studied in this paper. The suction pressure drop is as large as 54.5 kPa, which is 12.3% of the suction pressure at 1500 RPM. And the filling factor is 0.939. Results show that rotational speed and suction pressure affect the suction pressure drop altogether. As rotational speed increases, suction pressure drop increases almost linearly and filling factor decreases. Meanwhile, higher suction pressure leads to large suction pressure drop and lower filling factor. However, discharge pressure has little effect on suction process.

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Details

  • Original title: Experimental investigation on an ORC twin-screw expander with an emphasis on its suction process.
  • Record ID : 30024229
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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