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Effects of Degree of Superheat on the Running Performance of an Organic Rankine Cycle (ORC) Waste Heat Recovery System for Diesel Engines under Various Operating Conditions
Energies 2014, 7(4), 2436-2448; doi:10.3390/en7042436

Dynamic Response of a 50 kW Organic Rankine Cycle System in Association with Evaporators

1 Green Energy Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan 2 Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
* Author to whom correspondence should be addressed.
Received: 29 January 2014 / Revised: 23 March 2014 / Accepted: 9 April 2014 / Published: 17 April 2014
(This article belongs to the Special Issue Waste Heat Recovery—Strategy and Practice)
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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 organic Rankine cycle (ORC); evaporator; shell-and-tube heat exchanger; plate heat exchanger
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lee, Y.-R.; Kuo, C.-R.; Liu, C.-H.; Fu, B.-R.; Hsieh, J.-C.; Wang, C.-C. Dynamic Response of a 50 kW Organic Rankine Cycle System in Association with Evaporators. Energies 2014, 7, 2436-2448.

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