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

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Antti Uusitalo ()
Juha Honkatukia ()
Sami Nyyssönen ()
Teemu Turunen-Saaresti ()

Abstract:
Modern large-scale reciprocating engines can achieve high electrical efficiencies of up to 47 %. Despite the high efficiency of modern engine power plants, a large amount of energy is wasted in the process in a form of heat. The most significant heat streams in large diesel engine power plants can be identified as high-temperature exhaust gas heat and lower temperature heat streams from the charge air cooler, as well as jacket water and lube oil heat. The most significant efficiency improvement is related to exhaust gas heat, which is mainly utilized by using conventional steam Rankine cycles or high-temperature ORC. In addition, significant amounts of heat could be recovered also from the lower temperature heat streams to boost the electric power output of the system. Modern large-scale reciprocating engines are characterized by high pressure ratio turbochargers. In single-stage compression in a turbocharger compressor, the charge air temperature increases typically to 180-220 oC. This heat could be utilized in additional electricity production by replacing the engine intercooler with an ORC process. This study presents and discusses the technical aspects of designing ORC systems for charge air heat utilization. Different ORC working fluids were compared by evaluating thermodynamic performance of the ORC by means of process simulations. An experimental setup is designed to investigate the performance of this type of engine combined cycle with different ORC working fluids. The experimental results are expected to be available at the end of year 2013. REFERENCES [1] Z.Q. Wang, N.J. Zhou, J. Guo, X.Y. Wang, “Fluid selection and parametric optimization of organic Rankine cycle using low temperature waste heat” Energy, Vol 40, pp. 107-115, (2012). [2] J. Larjola, "Electricity from Industrial Waste Heat Using High-Speed Organic Rankine Cycle (ORC)", Int. J. Production Economics, Vol. 41 pp. 227-235, (1995).