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 and Chi-Chuan Wang
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Yuh-Ren Lee: Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Chi-Ron Kuo: Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Chih-Hsi Liu: Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Ben-Ran Fu: Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Jui-Ching Hsieh: Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Chi-Chuan Wang: Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan

Energies, 2014, vol. 7, issue 4, 1-13

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.

Keywords: organic Rankine cycle (ORC); evaporator; shell-and-tube heat exchanger; plate heat exchanger (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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