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Kaplan. 6 HSDUDWRU 3 U R G X F WL R Q Z H O O 3 UHKHDWHU Steam inlet temperature (°C): Steam flow rate (t/h): Brine inlet temperature (°C): Brine flow rate (t/h): Geothermal fluid outlet temperature (°C): Plant net power (MW): Dead state temperature (°C): 151 74.86 161.3 346.74 87 10,500 22 Figure 4 2 UJDQLF ) OXLG 7XUELQH * 5 HFXSHUDWRU &RQGHQVHU Figure 4 is the process flow diagram of the recuperated two-phase cycle. The recuperated two-phase process is used by Ormat in many geothermal projects all over the world, such as the 20 MW Zunil project in Guatemala (Figure 6), 14 MW Ribeira Grande I and II in San Miguel in the Azores, 1.8 MW Oserian and 13 MW OlkariaIII in Kenya, 6.5 MW Rotokawa Extension and 12 MW Ngawha in New Zealand, and 2.2 MW Hatchobaru in Japan. Figure 7 Operating conditions of the Pico-Vermelho project are as follows: 6 WH D P %ULQH , Q MH F WL R Q Z H O O 9 DSRUL] HU Figure 5 Figure 6 In the last quarter of 2006, the 11.5 MW Pico-Vermelho project was commissioned on the island of Sao Miguel in the Azores Islands. This project represents the third stage of development of the geothermal resources of the island, bringing the total installed geothermal power capacity to 24 MW. The project is based on the recuperated two-phase cycle and achieves high utilization efficiency of the heat source. o: marcom/papers/EGC/4547 3 April 16, 2007 Applying the exergy equations on the recuperated two- phase cycle of the Pico-Vermelho project results in the following: η = ex 10,500 kW 117.11 kg/sec x 219.64 kJ/kg e = m = 219 64 kJ/kg 117.11 kg/sec 10,500 kW Wnet = and the exergetic efficiency is = 0.408 which is very high compared to any alternative power conversion cycle for similar heating fluid conditions. Table 1 shows a comparison of processes and geothermal power plants prepared by Prof. DiPippo to which the Pico- Vermelho ORC cycle was added in italics.PDF Image | Organic Rankine Cycle Configurations
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