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NaΜjera et al. 4 Hybrid plant at San Vicente geoth. field π‘π‘ππππ ππ=ππ π π πππΆπΆ (2) π‘π‘ππ As shown in Table 1, all the quantities in the above equations are in IS units. Besides, area (A), thickness (h), porosity (Ο) and reservoir temperature (Ti) are considered here as random variables with triangle and normal log probability distributions. Some properties as density (Οr) and heat capacity (Cr) of the reservoir rocks are taken as uniform or constant distributions. Additional properties like abandonment temperature (Tf), recovery factor (Rf), conversion efficiency (Ce), economic life in years (t) of the project and power plant factor (Pf) are of a reasonable constant value. TABLE 1: Values and probability distributions for the variables of the volumetric method Variable Symbol SI units Min Most likely Max Probability distribution Area A km2 Thickness h m Temperature Ti Β°C Abandonment temperature Tf Β°C Porosity Ο Rock specific heat Cr kJ/kg Β°C Water specific heat Cw kJ/kg Β°C Rock density Οr kg/m3 Water density Οw kg/m3 Recovery factor Rf Conversion efficiency Ce Plant factor Pf Economic life Years 4 700 230 6 12 1500 2000 240 250 180 0.06 0.85 4.6 2500 806 0.20 0.12 0.95 30 Triangle Triangle Triangle Constant Normal Log SD=0.02 Constant Constant Constant Constant Constant Constant Constant Constant Figure 3 shows the results of 100,000 iterations using the Monte Carlo simulation. The available geothermal potential, with 90% of certainty, is between 21 and 58 MWe. The cumulative probability curve indicates that there is 80 to 90% of probability for extracting about 27 MWe of reserves existing in the San Vicente geothermal area. If 27 MWe are going to be developed in a single flash power plant, the total steam consumption would reach 54 kg/s and therefore hot separated water at 180 oC available for the 3HS+ORC hybrid power plant would be 162 kg/s. 6. FORESTRY BIOMASS The thermal energy that will be the second portion to drive the 3HS+ORC hybrid power plant, would be heat obtained through water, while both native Gliricidia Sepium (locally known as Madre Cacao) and imported Eucaliptus Camaldulensis trees will be used to burn into a conventional boiler. The chemical energy (Bridwater, A., 1996 and NogueΜs et al., 2010) contained in this biomass forestry type depends on their chemical constituents and moisture present in these trees. Table 2 summarizes the chemical composition of each tree as well as their higher heating value (HHV) dry base and lower heating value (LHV), with 30% wet base. Those heating values are related with the following equation and the plot in the Figure 4 indicating that the LHV decreases linearly with the moisture content. πΏπΏπΏπΏπΏπΏ =πΏπΏπΏπΏπΏπΏ οΏ½1β π€π€ οΏ½β24.49(π€π€+9πΏπΏ)οΏ½1β π€π€ οΏ½ (3) (π€π€πππ‘π‘) (ππππππ) 100 100 where w and H are the moisture ratio and dry base hydrogen fraction, respectively.PDF Image | HYBRID POWER PLANT USING THREE ENERGY RESOURCES
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