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Nájera et al. 8 Hybrid plant at San Vicente geoth. field 8. INTEGRATING THREE HEAT SOURCES AND THE ORC CYCLE (3HS+ORC) From the three previous analysis, the available water mass flow in the hot water/isopentane heat exchanger is around 243 Kg/s, which is the result of 162 kg/s separated geothermal water at 180oC/10 bar, 13 kg/s biomass at 200oC/20 bar and 68 kg/s thermosolar at 200oC/20 bar. Because of heat and pressure losses along the hot water transportation, the 243 kg/s hot water side of the water/isopentane heat exchanger would flow at least at 10 bar and 180oC, respectively. Figure 6 shows a linear correlation (Estevez (2012) among ORC turbine gross power output and both geothermal water at 184oC and isopentane mass flow rates. This linear tendency matches data for a 9 MW binary cycle power plant installed in the Berlin geothermal field. FIGURE 6: ORC turbine gross power output versus mass flow rates (Estevez, 2012) If that approach is conservatively applied not to the available 243 kg/s but to 231 kg/s hot water at 180oC, results presented in Table 5 come close to 10 MWe install capacity. The geothermal hot water flow ensures the highest contribution to the 10 MW ORC gross electrical power, hence, the geothermal portion should be taken as basis source of energy while the rest sources should be on line according they are either naturally available or stored in the synthetic oil, which conveniently can be use later to generate electricity. TABLE 5: Water flow and heat source breakdown for 10 MWe 3HS+ORC hybrid power plant Heat source (3HC) Geothermal Solar Biomass Total Water flow (kg/s) 158 63 10 231 ORC power (MWe) 6.9 2.7 0.4 10.0 The breakdown heat source contribution to generate 10 MWe during sunny and cloudy days is outlined in Figure 7. For days with clear sky or dry season, input thermal energy from 7 to 17 hours will be of the three types of resources, utilizing them for electrical generation and stored heat in the synthetic oil tank. During cloud coverage or wet season, the solar irradiance decreases partially or totally allowing the biomass boiler balances the reduction of hot water mass flow. In both scenarios, from 17 to 21 hours, sensible heat stored in thePDF Image | HYBRID POWER PLANT USING THREE ENERGY RESOURCES
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