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 5 Two-stage Rankine cycle power plant showing details of the streams The two stages produce a combined gross shaft power of 24.4 MW or electrical power of nearly 23 MWe. This gross power is substantially greater than that for the single stage. Parasitic power for the system also increases on account of the two heat exchangers through which the seawaters must flow. Despite increased parasitic power, we calculate the net power for the two stage system to be 16.17 MWe. This is substantially greater than that for the single stage system. We also note that the warm seawater leaves the system colder and the cold seawater warmer, than the single-stage system. Heat exchanger requirements are also indicated in Table 2 in the form of an overall heat-transfer coefficient times the heat exchanger area product, or the (UA) product. Heat exchange area required for the two stage system is greater than that for the single stage. We conducted a similar set of analyses for a three-stage and four-stage Rankine power cycles for OTEC. We summarize the results in accompanying Table 2. 7

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