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Thermodynamic Cycles using Carbon Dioxide

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Thermodynamic Cycles using Carbon Dioxide ( thermodynamic-cycles-using-carbon-dioxide )

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400 350 300 250 200 150 100 50 j 0 -50 -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 s [kJ/kg-K] Figure 2‐5 Carbon dioxide cooling and power combined cycle T‐S chart The corresponding cycle consists of six processes, namely: compression (c‐d), isobaric heat supply (d‐f), expansion (f‐g), isobaric heat rejection (g‐k), throttling (k‐a) and isobaric heat apply (a‐c). After absorbing heat in the evaporator (a‐b), the carbon dioxide will be further heated in the IHX I until it becomes slightly superheated (b‐c). The superheated carbon dioxide vapor will then be compressed by a compressor to a supercritical pressure (c‐d), where supercritical carbon dioxide absorbs the heat firstly from the expansion outlet carbon dioxide in IHX II (d‐e) and then from the heat source in a gas heater (e‐f). After that, the supercritical carbon dioxide will be expanded in an expander (f‐ g) and then cooled by IHX II (g‐h), a gas cooler (h‐j) and IHX I (j‐k) in turn. Finally, it flows though a throttling valve and enters the evaporator (k‐a). In the power part of the combined cycle (d‐f‐g‐i), carbon dioxide will absorb the heat from the low‐ 16 Carbon Dioxide Cooling and Power Combined Cycle T-S Chart f 0,2 k 350 bar 250 bar 100 bar i 40 bar 0,4 a 0,6 0,8 b d c e g h T [°C] 0,0017 0,019 0,034 0,0057 0,01 0,063 m3/kg

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