Modeling and Testing a Screw Expander Integrated into a Trilateral Flash Cycle

Abstract:

Trilateral Flash Cycle (TFC) is particularly suitable for recovering energy from low-grade heat source. This paper presented a new mathematical model for calculating the performance of a twin screw expander integrated into a TFC working with organic components. The geometric parameters related to the rotation angle of male rotor e.g. groove volume, suction and discharge port area, leakage area etc were used in the model. The combination effects of internal leakage through five paths, oil injection, gas-oil heat transfer and refrigerant property were taken into account. The sensitivity of single parameter was also analyzed. To verify the model and the calculated p-φ indicator diagram, experimental recording of the diagram of twin screw expander was performed. The results of theoretical calculation were in good agreement with the experimental data, which indicated that the model in the present paper could be used as a powerful tool for performance prediction and product development.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 727-733
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.727
• Online since: November 2011
• Authors: Zhi Gang Wang, Shan He, Jian Xin Li, Guo Jun Song
• Keywords: Experimental Verification, Indicator Diagram, Numerical Simulation, Trilateral Flash Cycle, Twin Screw Expander

References

[1] D.L. Margolis, Analytical modeling of helical screw turbines for performance prediction, ASME J. Engineering for Power. vol. 100, pp.482-487, (1978).

DOI: 10.1115/1.3446383

[2] K. Tatushi, H. Naomichi, Study on fundamental performance of helical screw expander, Bulletin of JSME. vol. 243, pp.1970-1977, (1985).

DOI: 10.1299/jsme1958.28.1970

[3] R.F. Steidel, H. Weiss, J.E. Flower, Characteristics of the Lysholm engine as tested for geothermal applications in the imperial valley, J. Engineering for Power. vol. 104, pp.231-240, (1982).

DOI: 10.1115/1.3227255

[4] R.F. Steidel, D.H. Pankow, K.A. Brown, The empirical modeling of a Lysholm screw expander, Proc. Intersociety Energy Conversion Engineering Conference, Orlando, Florida, 1983, pp.286-293.

[5] M.K. Dunbar, Altering the volumetric expansion ratio of a Lysholm helical screw expander, USDOE, DOE/ET/27252-T3. (1984).

DOI: 10.2172/6771079

[6] I.K. Smith, N. Stosic, C.A. Aldis, Development of the trilateral flash cycle system Part 3; The design of high-efficiency two-phase screw expanders, Proc. Institution of Mechanical Engineers, vol. 210, p.75, (1996).

DOI: 10.1243/pime_proc_1996_210_010_02

[7] L.J. Guo, Flow Mechanic of Two-phase and Multi-phase, Xi'an Jiaotong University Press, Xi'An, China (In Chinese), (2002).

[8] K. Kauder and R. Zellermann, Einspritzflussigkeit im Schraubenmotor, " Proc. VDI Tagung Schrauhmaschinen , 94, Dortmund, Germany, pp.153-174, (1994).