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Hybrid plant at San Vicente geoth. field 7 Nájera et al. steam turbines. CSP plants can be equipped with a heat storage system for electricity generation at night or when it’s cloudy. There are four CSP variants: Parabolic trough, Fresnel reflector, solar tower and solar dish, which differ depending on the design, configuration of mirrors and receivers, heat transfer fluid used and whether or not heat storage is involved (Kalogirou, 2009 and Chen, 2011). Despite of the parabolic trough which is commercially the most developed technology, the solar tower mode with a heat storage system seems to be appropriate to deploy in the San Vicente area mainly because of its adaptability to non-flat terrain, neglected thermal losses, ability to operate at high pressure to heat water and its cost will be competitive by the years 2020-2025 to the conventional power plants. The solar tower configuration, shown in Figure 5, is estimated to consist of 400 heliostats deployed in a circular shape to optimize 1 km2 land size. Because of the terrain topography, the southern semicircle of the solar field will have more heliostats than the northern semicircle. Thus, considering 12m x10m per heliostat size, the total aperture area will be 48,000 m2. Each heliostat will track the sun along the azimuthal and elevation solar position, resulting on continuous solar concentration. At 100 m height, above the center of the heliostat circle, a tubular cylinder type boiler will receive concentrated sunlight to heat deionized water. This boiler or heat receiver should be installed next to the 3HS+ORC hybrid power plant to reduce energy consumption when pumping hot water to the heat exchanger of the hybrid power plant. North The lower elevation land to the north of the San Vicente geothermal production wells could have an annual global irradiation, characteristic of the world solar belt, which according to LaGeo solar monitoring in “15 de Septiembre” hydropower dump, is almost 2000 KWh/m2.year equivalent to 5.0 to 5.5 kWh/m2 day. If design irradiance is taken as 800 W/m2 during 7 hours/day and solar field global efficiency is 44%, the solar power input would reach almost 38 MW and the water flowing into the receiver would gain approximately 17 MWth. These quantities are summarized in Table 4. TABLE 4: Thermal power from the solar field Solar power input, efficiency and thermal power output Value Solar irradiance (W/m2) 800 Solar power input (MW) 38.4 Solar field global efficiency 44% Thermal power absorbed by water (MW) 16.9 Therefore, if the working pressure in the receiver is 20 bar-g, the water mass flow that changes temperature from 140 to 200oC when it has absorbed 17 MWth, results on about 68 kg/s. FIGURE 5: Heliostat solar fieldPDF Image | HYBRID POWER PLANT USING THREE ENERGY RESOURCES
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