THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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Influence of evaporating rate on two-phase expansion in the piston expander with cyclone separator

ABSTRACT
The Trilateral Flash Cycle shows a greater potentiality in moderate to low grade heat utilization systems due to its potentiality of obtaining high exergy efficiency, compared to the conventional thermodynamic cycles such as the Organic Rankine Cycles and the Kalina Cycle. The main difference between the Trilateral Flash Cycle and the conventional thermodynamic cycles is that the superheated vapor expansion process is replaced by the two-phase expansion process. The two-phase expansion process actually consists of a flashing of the inlet stream into a vapor and a liquid phase. Most simulations assume an equilibrium model with an instantaneous flashing. Yet, the experiments of pool flashing indicate that there is a flash evaporating rate. The mechanism of this process still remains unclear. In this paper, the flash evaporating rate is introduced into the model of the two-phase expansion process in the reciprocating expander with a cyclone separator. As such, the obtained results reveal the influence of evaporating rate on the efficiency of the two-phase expander.
KEYWORDS
PAPER SUBMITTED: 2018-09-03
PAPER REVISED: 2018-11-14
PAPER ACCEPTED: 2018-11-19
PUBLISHED ONLINE: 2018-12-16
DOI REFERENCE: https://doi.org/10.2298/TSCI180903322W
REFERENCES
  1. Pei, G., et al., Construction and dynamic test of a small-scale organic rankine cycle, Energy, 36 (2011), 5, pp. 3215-3223
  2. Tahani, M., et al., A comprehensive study on waste heat recovery from internal combustion engines using organic Rankine cycle, Thermal Science, 17 (2013), 2, pp. 611-624
  3. Barbazza, L., et al., Optimal design of compact organic Rankine cycle units for domestic solar applications, Thermal Science, 18 (2014), 3, pp. 811-822
  4. Zhu, Q., et al., Performance analysis of organic Rankine cycles using different working fluids, Thermal Science, 19 (2015), 1, pp. 179-191
  5. Kang, S.H., Design and preliminary tests of ORC (organic Rankine cycle) with two-stage radial turbine, Energy, 96 (2016), pp. 142-154
  6. Ganesh, S.,T. Srinivas, Processes development for high temperature solar thermal Kalina power station, Thermal Science, 18 (2014), suppl.2, pp. 393-404
  7. Modi, A.,F. Haglind, Performance analysis of a Kalina cycle for a central receiver solar thermal power plant with direct steam generation, Applied Thermal Engineering, 65 (2014), 1-2, pp. 201-208
  8. Wang, E.,Z. Yu, A numerical analysis of a composition-adjustable Kalina cycle power plant for power generation from low-temperature geothermal sources, Applied Energy, 180 (2016), pp. 834-848
  9. Cao, L., et al., Thermodynamic analysis of a Kalina-based combined cooling and power cycle driven by low-grade heat source, Applied Thermal Engineering, 111 (2017), pp. 8-19
  10. Modi, A.,F. Haglind, Thermodynamic optimisation and analysis of four Kalina cycle layouts for high temperature applications, Applied Thermal Engineering, 76 (2015), pp. 196-205
  11. Modi, A., et al., Thermoeconomic optimization of a Kalina cycle for a central receiver concentrating solar power plant, Energy Conversion and Management, 115 (2016), pp. 276-287
  12. Smith I.K., Development of the trilateral flash cycle system Part 1: fundamental considerations, Proceedings of the Institution of Mechanical Engineers Part a-Journal of Power and Energy, 207 (1993), A3, pp. 179-194
  13. Smith I.K., Dasilva R.P.M., Development of the trilateral flash cycle system Part 2: increasing power output with working fluid mixtures, Proceedings of the Institution of Mechanical Engineers Part a-Journal of Power and Energy, 208 (1994), A2, pp. 135-144
  14. Ajimotokan, H.A.,I. Sher, Thermodynamic performance simulation and design optimisation of trilateral-cycle engines for waste heat recovery-to-power generation, Applied Energy, 154 (2015), pp. 26-34
  15. Garcia, R.F., et al., Energy and entropy analysis of closed adiabatic expansion based trilateral cycles, Energy Conversion and Management, 119 (2016), pp. 49-59
  16. Fischer, J., Comparison of trilateral cycles and organic Rankine cycles, Energy, 36 (2011), 10, pp. 6208-6219
  17. Yari, M., et al., Exergoeconomic comparison of TLC (trilateral Rankine cycle), ORC (organic Rankine cycle) and Kalina cycle using a low grade heat source, Energy, 83 (2015), pp. 712-722
  18. Lai, N.A.,J. Fischer, Efficiencies of power flash cycles, Energy, 44 (2012), 1, pp. 1017-1027
  19. Smith I.K., et al., Development of the trilateral flash cycle system Part 3: the design of high-efficiency two-phase screw expanders, Proceedings of the Institution of Mechanical Engineers Part a-Journal of Power and Energy, 210 (1996), 1, pp. 75-93
  20. Bao, J.,L. Zhao, A review of working fluid and expander selections for organic Rankine cycle, Renewable and Sustainable Energy Reviews, 24 (2013), pp. 325-342
  21. Bianchi, G., et al., Development and analysis of a packaged Trilateral Flash Cycle system for low grade heat to power conversion applications, Thermal Science and Engineering Progress, 4 (2017), pp. 113-121
  22. Kanno, H.,N. Shikazono, Modeling study on two-phase adiabatic expansion in a reciprocating expander, International Journal of Heat and Mass Transfer, 104 (2017), pp. 142-148
  23. Bianchi, G., et al., Numerical modeling of a two-phase twin-screw expander for Trilateral Flash Cycle applications, International Journal of Refrigeration, 88 (2018), pp. 248-259
  24. Kanno, H.,N. Shikazono, Experimental and modeling study on adiabatic two-phase expansion in a cylinder, International Journal of Heat and Mass Transfer, 86 (2015), pp. 755-763
  25. Steffen, M., et al., Efficiency of a new Triangle Cycle with flash evaporation in a piston engine, Energy, 57 (2013), pp. 295-307
  26. Miyatake O., et al., An experimental-study of spray flash evaporation, Desalination, 36 (1981), 2, pp. 113-128
  27. Gopalakrishna S., et al., An experimental-study of flash evaporation from liquid pools, Desalination, 65 (1987), 1-3, pp. 139-151
  28. Yan, J.J., et al., Experimental study on static/circulatory flash evaporation, International Journal of Heat and Mass Transfer, 53 (2010), 23-24, pp. 5528-5535
  29. Saury, D., et al., Flash evaporation from a water pool: Influence of the liquid height and of the depressurization rate, International Journal of Thermal Sciences, 44 (2005), 10, pp. 953-965
  30. Saury D., et al., Experimental study of flash evaporation of a water film, International Journal of Heat and Mass Transfer, 45 (2002), 16, pp. 3447-3457
  31. Zhang, D., et al., Study on steam-carrying effect in static flash evaporation, International Journal of Heat and Mass Transfer, 55 (2012), 17-18, pp. 4487-4497
  32. Zhao, B., et al., Experimental study on equilibrium waterfilm concentration in static flash evaporation of aqueous NaCl solution, Desalination, 353 (2014), pp. 109-117
  33. Zhang, D., et al., Experimental study on static flash evaporation of aqueous NaCl solution, International Journal of Heat and Mass Transfer, 55 (2012), 23-24, pp. 7199-7206
  34. Nist standard reference database 23: reference fluid thermodynamic and transport properties-refprop, Version 9.0. National Institute of Standards and Technology, Standard reference data program, Gaithersburg, Maryland, USA, 2010