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Energies 2014, 7(6), 3684-3694; doi:10.3390/en7063684
Article

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

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Received: 11 April 2014; in revised form: 29 May 2014 / Accepted: 9 June 2014 / Published: 13 June 2014
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Abstract: An organic Rankine cycle system comprised of a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and the operational control strategy. R245fa was used as the working fluid. Under the design conditions, the net power output is 243 kW and the system thermal efficiency is 9.5%. For an off-design heat source flow rate (mW), the operating pressure was controlled to meet the condition that the R245fa reached the liquid and vapor saturation states at the outlet of the preheater and the evaporator, respectively. The analytical results demonstrated that the operating pressure increased with increasing mW; a higher mW yielded better heat transfer performance of the preheater and required a smaller evaporator heat capacity, and the net power output and system thermal efficiency increased with increasing mW. For the range of mW studied here, the net power output increased by 64.0% while the total heat transfer rate increased by only 9.2%. In summary, off-design operation of the system was examined for a heat source flow rate which varied by –39.0% to +78.0% from the designed rate, resulting in –29.2% to +16.0% and –25.3% to +12.6% variations in the net power output and system thermal efficiency, respectively.
Keywords: organic Rankine cycle; off-design conditions; thermal efficiency organic Rankine cycle; off-design conditions; thermal efficiency
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Fu, B.-R.; Hsu, S.-W.; Lee, Y.-R.; Hsieh, J.-C.; Chang, C.-M.; Liu, C.-H. Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions. Energies 2014, 7, 3684-3694.

AMA Style

Fu B-R, Hsu S-W, Lee Y-R, Hsieh J-C, Chang C-M, Liu C-H. Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions. Energies. 2014; 7(6):3684-3694.

Chicago/Turabian Style

Fu, Ben-Ran; Hsu, Sung-Wei; Lee, Yuh-Ren; Hsieh, Jui-Ching; Chang, Chia-Ming; Liu, Chih-Hsi. 2014. "Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions." Energies 7, no. 6: 3684-3694.


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