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Staging Rankine Cycles Using Ammonia for OTEC Power Production

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Staging Rankine Cycles Using Ammonia for OTEC Power Production ( staging-rankine-cycles-using-ammonia-otec-power-production )

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Figure 3 Variation of net power versus ammonia circulation rate Note that the parasitic power used in the system is large, over 30% of the gross electric power generated as shown in Table 2. The quoted pressure losses in Table 1 are consistent with an OTEC system mounted on a floating platform. Over 5 MWe power is used up in pumping the seawaters and circulating ammonia through the system. In case of a shore-based system, the parasitic power used within the plant may reach 40% of the gross power. Temperature-entropy diagram for the single-stage ammonia cycle with proper scales is shown in Figure 4. Note that the warm seawater water leaves the system at 22.62oC and the cold seawater leaves at 10.3oC. There is still substantive potential left in these streams to extract usable energy using multiple stages in the cycle. 5

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