Dynamic response of a 50 kW organic rankine cycle system in association with evaporators

Yuh Ren Lee, Chi Ron Kuo, Chih Hsi Liu, Ben Ran Fu, Jui Ching Hsieh, Chi-Chuan Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

The influences of various evaporators on the system responses of a 50 kW ORC system using R-245fa are investigated in this study. First the effect of the supplied hot water flowrate into the evaporator is examined and the exit superheat on the system performance between plate and shell-and-tube evaporator is also reported. Test results show that the effect of hot water flowrate on the evaporator imposes a negligible effect on the transient response of the ORC system. These results prevail even for a 3.5-fold increase of the hot water flowrate and the system shows barely any change subject to this drastic hot water flowrate change. The effect of exit superheat on the ORC system depends on the type of the evaporator. For the plate evaporator, an exit superheat less than 10 °C may cause ORC system instability due to considerable liquid entrainment. To maintain a stable operation, the corresponding Jakob number of the plate heat evaporator must be above 0.07. On the other hand, by employing a shell and tube heat evaporator connected to the ORC system, no unstable oscillation of the ORC system is observed for exit superheats ranging from 0 to 17 °C.

Original languageEnglish
Pages (from-to)2436-2448
Number of pages13
JournalEnergies
Volume7
Issue number4
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Evaporator
  • Organic rankine cycle (ORC)
  • Plate heat exchanger
  • Shell-and-tube heat exchanger

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