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ACCEPTED MANUSCRIPT 4 Compound CO2 cycles 4.1 High pressure compound cycles With reference to Figure 3.c, as previously observed, the large temperature difference in the simple cycle regeneration process (t4 − t6 = 212 ◦C in the diagram reported) is responsible of a severe entropy production and efficiency loss. To get around this drawback in the regeneration process heat capaci- ties of the cold and of the hot medium can be balanced reducing the mass rate of the condensed gas by compressing, in a mechanical device (without condensation), a fraction of the pre–cooled gas. Figure 8 reports the new cycle configuration and component layout as originally suggested in [7]. As shown in Figure 8.b heat transfer in the cold regenerator becomes much less irreversible (average temperature difference 17 ◦C) with an important gain both in efficiency and in the SPP parameter. As shown in Figure 9 at a top temperature of 600 ◦C, for example, maximum efficiency is 53.3 % (47.5 % for the simple cycle, 46.5 % for the nitrogen Brayton cycle) and maximum SPP is 0.69 MWe/(kg/s) (0.50 for the simple cycle, 0.72 for the nitrogen Brayton cycle). It must be observed, however, that for CO2 in opposition to what happens in the nitrogen cycle, top efficiency and top SPP are reached at different condensation temperatures (-50 ◦C for the best efficiency, 0 ◦C for the best SPP). 16 peer-00573462, version 1 - 4 Mar 2011PDF Image | Class Action Information Notice Ormat Technologies
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