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Dynamic Modelling and Simulation of an Organic Rankine Cycle Unit of a Geothermal Power Plant

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Dynamic Modelling and Simulation of an Organic Rankine Cycle Unit of a Geothermal Power Plant ( dynamic-modelling-and-simulation-an-organic-rankine-cycle-un )

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Sohel et al. 6 5 4 3 2 1 0 1 101 201 301 401 501 601 701 801 901 1001 Time [h] 24 per. Mov. Avg. (Modelled ) 24 per. Mov. Avg. (Observed) Figure 16: Electrical power output for 1000 hours of operation with a maximum pentane mass flow of 48.5 kg/s 40 35 30 25 20 15 10 5 0 1 101 201 301 401 501 601 701 801 901 Time [h] 24 per. Mov. Avg. (Observed) 24 per. Mov. Avg. (Modelled) Figure 17: Condenser outlet temperature for 1000 hours 160 150 140 130 120 110 100 1 101 201 301 401 501 601 701 801 901 Time [h] 24 per. Mov. Avg. (Observed) 24 per. Mov. Avg. (Modelled) Figure 18: Brine outlet temperature for 1000 hours operation 2.9 Conclusions Steady state model of geothermal power plants are commonly available in the literature. However, dynamic models are not very common. In this paper a dynamic model of an ORC unit of a geothermal power plant is presented. The model takes into account effect of internal and external parameters, which are necessary to simulate the plant performance with reasonable accuracy. The results of simulation are also presented and compared against the plant performance data. It was found that the developed model is competent to predict the plant performance with reasonably high accuracy. The average percentage error of electric power output remains within 5%. 12 Brine outlet temperature [C] Condenser outlet temperature [C] Electrical power [MW]

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