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CO2 Mixtures as Working Fluid for High-Temperature Heat Recovery

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CO2 Mixtures as Working Fluid for High-Temperature Heat Recovery ( co2-mixtures-as-working-fluid-high-temperature-heat-recovery )

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Energies 2020, 13, 4014 4 of 18 In the following, we assumed a minimum pressure P1 equal to 100 bar for carbon dioxide cycles, taking advantage of the cycle efficiency of the real gas effects in the compression phase [25]. Figure 3 presents the thermodynamic cycle efficiency and the total efficiency of simple recuperative carbondioxidecycles.ThetemperatureTH1 ofthefluegaswasassumedtobeequalto450◦C(according to Table 1). Figure 1. The reference plant scheme generally assumed for the calculations. The pump and the compressor are interchangeable depending on whether there is condensation. In some cases (according to the working fluid), the recuperator may not be necessary. Figure 2. Simple recuperative carbon dioxide cycles in the T–S thermodynamic plane. As the optimal maximum cycle temperature T3 is equal to 350 ◦C, in the following, we assumed for simplicity the same value for all the considered working fluids and for all the discussed cases. In Figure 4 cycle (a) of Figure 2 is reported in a plane of temperature–transferred power. In this plane, the relations between the thermodynamic cycle and the heat sources are shown. The maximum pressure of this cycle (350 bar) is not feasible in practical applications, although these conditions

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