A Design of the Organic Rankine Cycle for the Low Temperature Waste Heat

Authors: K. Fraňa, M. Müller

Abstract:

A presentation of the design of the Organic Rankine cycle (ORC) with heat regeneration and superheating processes is a subject of this paper. The maximum temperature level in the ORC is considered to be 110°C and the maximum pressure varies up to 2.5MPa. The selection process of the appropriate working fluids, thermal design and calculation of the cycle and its components are described. With respect to the safety, toxicity, flammability, price and thermal cycle efficiency, the working fluid selected is R134a. As a particular example, the thermal design of the condenser used for the ORC engine with a theoretical thermal power of 179 kW was introduced. The minimal heat transfer area for a completed condensation was determined to be approximately 520m². 

Keywords: Organic Rankine Cycle, thermal efficiency, working fluids.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1337063

References:

[1] B. Saleh, G. Koglbauer, M. Wenland a J. Fischer, Working Fluids for Low-Temperature Organic Rankine Cycles, Energy 32 (2007), 1210-1221, doi:10.1016/j.energy.2006.07.001
[2] G.J. Zyhowski, A. P. Brown a A. Achaichia, HFC-245fa Working Fluid in Organic Rankine Cycle: A Safe and Economic Way to Generate Electricity from Waste Heat. 2010.
[3] Neil P. Leslie, Ohad Zimron, Richard S. Sweetser, Therese K. Stovall, PE, Recovered Energy Generation Using an Organic Rankine Cycle System.
[4] P.J., Mago, L.M., Chamre and C. Somayaji. Performance Analysis of Different Working Fluids for Use in Organic Rankine Cycles. Proc. IMECHE, Vol. 221, Part A: J. Power and Energy (2007), 255-264. DOI: 10.1243/09576509JPE372.
[5] D. Wei, X. LU, Z. Lu a J. Gu, Performance Analysis and Optimization of Organic Rankine Cycle (ORC) for Waste Heat Recovery. Energy Conversion and Management 48 (2007), 1113–1119. DOI: 10.1016/j.enconman.2006.10.020.
[6] D. K. Detlev, Air-Cooled Heat Exchangers and Cooling Towers: Thermal-Flow Performance Evaluation and Design.
[7] T. Kuppan, Heat Exchanger Design Handbook, CRC Press, 2000.
[8] Traviss, D. P., Rohsenow, W. M., Baron, A.B. Forced-Convection Condensation inside Tubes: A Heat Transfer Equation for Condenser Design. ASHRAE Transactions 1972.
[9] F. P. Incropera, D.P. DeWitt, L. T. Bergman, and A.S. Lavine, Fundamentals of Heat and Mass Transfer, John Wiley & Sons, 6th Edition, 2007.