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Proceedings of the University of Vaasa. Reports 13 lected, based on its thermodynamic properties and profitable cost level. An up to 5 % improvement in engine fuel efficiency is possible by utilizing ORC in their case. 8 Supercritical CO2 Rankine cycle Carbon dioxide CO2 (R-744) is a natural working fluid; inexpensive, non- explosive, non-flammable, and non-toxic. Its critical pressure and temperature are 73.8 bar and 31.1oC, respectively. (Yamaguchi et al. 2006; Wang et al. 2006) Working fluids with relatively low critical temperature and pressure can be com- pressed directly to their supercritical pressures and heated to their supercritical state before expansion. The heating process of a supercritical Rankine cycle does not pass through a distinct two-phase region like a conventional steam Rankine cycle, thus getting a better thermal match in the boiler with less irreversibility. (Chen 2011) A supercritical CO2 power cycle shows high potential for recovering low-grade waste heat. (Wang et al. 2006) Yamaguchi et al. (2006) propose a supercritical CO2 Rankine cycle for solar ener- gy production. The system utilizes evacuated solar collectors to convert CO2 into high temperature supercritical state, used to drive a turbine and thereby produce mechanical energy and hence electricity (Figure 8). Figure 8. The principal diagram of the solar-powered Rankine cycle after (Yamaguchi et al. 2006)PDF Image | Waste Heat Recovery Bottoming Cycle Alternatives
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