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components and installation costs. The only existing sCO2 heat engine of appreciable size is the EPS100. The cost models used herein are based on the experience gained in the design and fabrication of this system, and to a lesser extent additional experience developed during pilot-scale system design and fabrication, and the ongoing design of the 1.5 MWe EPS30M system [27]. The system hardware costs are divided into two main categories. The first category constitutes items that represent an essentially fixed cost, such as instrumentation and controls, for which the costs determined in the EPS100 program are used directly. The second category includes items that scale with power output, such as generators, gearboxes, piping and valves. For these items, individual cost models have been c r e a t e d b a s e d o n l i t e𝑖 r a t u r e r e f e r e n c e s , s u p p l i e r q u o t e s , a n d c a t a l o g p r i c i n g a s available. In general, the cost models follow power-law expressions: 𝐶𝐶𝐶𝐶=𝐴+𝑏·𝑃 , where P is the rated output power of the system. The exponent n ranges from 0.6 to 1.0, depending on the component. Installation costs are assumed to follow a similar trend as steam system components, with an “installation cost factor” defined as the total installed cost of the component or subsystem divided by the hardware cost of the item. These cost factors are derived from system design studies using the Thermoflow GT- Pro/PEACE software [2]. Figure 7: Cost/kW vs net power for three sizes of combined cycle plants, normalized to GT-Pro “power- optimized” cases. The open symbols are two example GT-Pro cases using the “cost-optimized” option. RESULTS Comparisons between system performance and cost are shown in Figure 7 for three different general types and sizes of combined cycle plants. The cost/kW and net power 12PDF Image | SUPERCRITICAL CO2 CYCLES FOR GAS TURBINE COMBINED CYCLE
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