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Session: System design and optimization VI
Session starts: Tuesday 08 October, 15:40
Presentation starts: 16:00
Room: Ruys & Rijckenvorsel Zaal

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Thomas Tartière (Enertime)
Benoit Obert (Enertime)
Laurent Sanchez (Enertime)

Abstract:
Recent studies underline the great potential of using trans-critical Organic Rankine Cycles (ORC) in order to increase the thermal efficiency of electricity production from low-temperature heat sources. However, the choice of a supercritical high pressure in the system has significant consequences on the costs and performances of its subcomponents. This work develops a method intended for assessing the thermo-economic potential of trans-critical cycles for various fluids and heat source temperatures in the range 80-150°C. Effects on heat exchanger areas are analyzed using plate heat exchanger models. Axial turbine preliminary design is carried out. Then, cost functions are built for every components of the system, leading to an estimation of the specific investment cost (SIC). Multi-parameters optimization is carried out for heat source temperatures between 80°C and 150°C, with SIC as objective function. Results are described and analyzed for different fluids, showing that the choice of a supercritical high pressure does not necessarily lead to an economic optimum. REFERENCES [1] S. Quoilin, S. Declaye, B. Tchanche, V. Lemort, “Thermo-economic optimization of waste heat recovery Organic Rankine Cycles”, Applied Thermal Engineering, Vol. 31, pp. 2885-2893, (2011) [2] S. Zhang, H. Wang, G. Tao, “Performance comparison and parametric optimization of subcritical Organic Rankine Cycle (ORC) and transcritical power cycle system for low-temperature geothermal power generation”, Applied Energy, Vol. 88, pp. 2740-2754, (2011) [3] G. Tao, H. Wang, S. Zhang, “Comparative analysis of natural and conventional working fluids for use in transcritical Rankine cyle using low temperature geothermal source”, International Journal of Energy Research, Vol. 35, pp. 530-544, (2011) [4] S. Karellas, A. Schuster, A.D. Leontaritis, “Influence of supercritical ORC parameters on plate heat exchanger design”, Applied Thermal Engineering, Vol. 33-34, pp. 70-76, (2012) ACKNOWLEDGMENT The investigations presented in the paper have been partially funded by the French Environment and Energy Management Agency (ADEME).