Browsing by Author "Fu, Ben-Ran"

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Dynamic Response of a 50 kW Organic Rankine Cycle System in Association with Evaporators
(2014-04-01)
Lee, Yuh-Ren
;
Kuo, Chi-Ron
;
Liu, Chih-Hsi
;
Fu, Ben-Ran
;
Hsieh, Jui-Ching
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 degrees 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 degrees C.
Response of a 50 kW Organic Rankine Cycle System Subject to Influence of Evaporators
(2014-01-01)
Lee, Yuh-Ren
;
Kuo, Chi-Ron
;
Liu, Chih-Hsi
;
Fu, Ben-Ran
;
Wang, Chi-Chuan
The variations of the evaporator on the system responses of a 50 kWe ORC system using R-245fa are investigated. The effect of exit superheat on the ORC system depends of the types of the evaporator. For the plate evaporator, an exit superheat less than 10 degrees C may cause ORC system unstable due to liquid entrainment. For maintaining stable operation, the corresponding Jakob number of the plate heat evaporator must be above 0.07. On the other hand, no unstable oscillation of the ORC system is observed for an exit superheat of 0 similar to 47 degrees C when the shell-and-tube heat exchanger is used as the evaporator. (C) 2014 The Authors. Published by Elsevier Ltd.