Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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The correlation for net power cycle output is of the following form: N e t _ P o w e r = a + a ⋅ T + a ⋅ T 2 + a ⋅ m& + a ⋅ m& 2 + a ⋅ T [A.1] The correlation for net heat transfer fluid output temperature is of the following form: 0 1 HTF,in 2 HTF,in 3 HTF 4 HTF 5 WF,min + a ⋅ T 2 + a ⋅ T ⋅ m& + a ⋅ T ⋅ T + a ⋅ m& ⋅ T 6 WW,min 7 HTF,in HTF 8 HTF,in WF,min 9 HTF WF,min T = b + b ⋅ T + b ⋅ T 2 + b ⋅ m& + b ⋅ m& 2 + b ⋅ T HTF,out 0 1 HTF,in 2 HTF,in 3 HTF 4 HTF 5 WF,min [A.2] The coefficients for each correlation derived for the APS plant are listed as the default + b ⋅ T 2 + b ⋅ T ⋅ m& + b ⋅ T ⋅ T + b ⋅ m& ⋅ T 6 WF,min 7 HTF,in HTF 8 HTF,in WF,min 9 HTF WF,min values in the Parameters table. Maximum and minimum heat transfer fluid flow rates and temperatures are provided as parameters. If heat transfer fluid flow rate or temperature exceeds the maximum values then the power cycle is bypassed. Likewise, the power cycle is bypassed if heat transfer fluid flow or temperature is less than the minimum value. The default maximum and minimum values for the heat transfer fluid are estimated from plant documentation [Price, 2006]. Type 996 is configured to allow simulation of larger powerplants by scaling the performance of the 1-MW design case. To demonstrate this, consider setting the Plant_Size parameter to 5,000 kW (5 times the design size). It follows that the expected heat transfer fluid flow rate would be 5 times larger in order to deliver sufficient thermal energy to the power cycle. To accommodate this larger flow rate with the 1,000 kW model, the heat transfer fluid mass flow rate is scaled linearly with plant size in the following manner: m& = m& H T F , i n [ A . 4 ] 159 HTF ,in (Plant _ Size / Plant _ SizeDEFAULT ) Note that as plant size scales, so too will the cooling load. Thus, in the 5,000 kW case the default plant would require 1,250 kg/s of cooling water rather than 250 kg/s. Parameters Name 1 Plant_Size 2 a0 3 a1 0. a2 5 a3 6 a4 Dimension Power Dimensionless Dimensionless Dimensionless Dimensionless Dimensionless Unit Type [kW] real [-] real [-] real [-] real [-] real [-] real Range [-inf;inf] [-inf;inf] [-inf;inf] [-inf;inf] [-inf;inf] [-inf;inf] Default 1000 479.2416 -4.892304 0.01149868 -63.54109 -1.057854

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