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14 Proceedings of the University of Vaasa. Reports A solar collector is used to heat the CO2 contained in the heating channels. This heat transfer process results in the trans-critical cycle, i.e. with subcritical low- side and supercritical high-side pressure. The supercritical CO2 drives the turbine, and hence, the connected electrical generator. After leaving the high- and low- temperature heat recovery system, the CO2 is cooled to a liquid state and pumped back into the higher pressure condition. (Yamaguchi et al. 2006) Because of the high temperature in the solar collector, this CO2-based Rankine cycle would have to operate in the transcritical cycle most of the time, i.e. with heat absorption above the critical temperature and supercritical high-side pres- sure. However, the low-side conditions would remain subcritical (Figure 9). (Ya- maguchi et al. 2006) Figure 9. The cycle studied by Yamaguchi et al. (2006) in the p–h (a) and T–s (b) diagrams, after (Yamaguchi et al. 2006) An experimental prototype has been designed, constructed and tested under typi- cal summer conditions in Kyoto, Japan. The experimental results showed that the solar energy powered Rankine cycle using CO2 works stably in a transcritical region. The time-averaged power generation efficiency was found to be 25 %. In a previous theoretical study, the annual averaged power generation efficiency was calculated to be 22 %. A comparison shows that the theoretical predictions are close to the measurement values. (Yamaguchi et al. 2006)PDF Image | Waste Heat Recovery Bottoming Cycle Alternatives
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