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Analysis of Organic Rankine Cycles for a Boiler Station

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Analysis of Organic Rankine Cycles for a Boiler Station ( analysis-organic-rankine-cycles-boiler-station )

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pressure is determined by the exit temperature of the cooling flow through the condenser; a low temperature cooling flow results in a low condenser pressure which is desirable. However, the exit temperature of the cooling flow depends on the thermal power output and the net electric efficiency of the ORC. Therefore an iterative approach is used in order to model and simulate the system. The ORC is modeled with the parameters listed in table 1, and the profitability is determined using the parameters listed in table 2. Table 1 List of parameters of the ORC model Parameter Fluid Expander isentropic efficiency Pump isentropic efficiency Generator electric efficiency Condenser HX TTD Evaporator HX TTD Evaporation temperature Energy losses Piping pressure losses Maximum allowable thermal power input Part load performance Table 2 List of economic parameters Parameter Discount rate Economic lifetime Electricity price Electricity certificate price Electricity distribution cost Power charge fee High load power charge fee Fuel price ORC unit cost Installation cost Operation and maintenance cost Value R1233ZD(E) [C3ClF3H2] 80% 80% 95% 10 °C 10 °C 135 °C Neglected Neglected 10 · PRAT ED Accounted for by correction factor 5% [60] 20 years [4][53][55] 0.45 SEK⁄MWh 0.05 SEK⁄MWh [61] 0.05 SEK/kWh [60] 172 SEK⁄kW [60] 256 SEK⁄kW [60] 0.200 SEK⁄MWh [60] 10-30 kSEK⁄kW [4][53][55] 20% of ORC unit cost 2% of ORC unit cost [4][53][55] v Value

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