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Processes 2020, 8, 216 Processes 2020, 8, x FOR PEER REVIEW Figure 8. T-s diagram of the split-flow expansion cycle. Figure 8. T-s diagram of the split-flow expansion cycle. 3. Thermodynamic Modeling 3. Thermodynamic Modeling Before establishing the mathematical model of this system, some general assumptions should be formulated, as follows: (1) All devices operate at a steady state or nearly at a steady state; the property be formulated, as follows: (1) All devices operate at a steady state or nearly at a steady state; the variations with time are small enough to ignore. (2) The kinetic and potential energies are neglected. property variations with time are small enough to ignore. (2) The kinetic and potential energies are (3) The heat losses in each component and pipe are also neglected. (4) The pressure drop and neglected. (3) The heat losses in each component and pipe are also neglected. (4) The pressure drop 7 of 23 7 of 23 Before establishing the mathematical model of this system, some general assumptions should entropy increase in each component and pipe are ignored for simplicity. The basic thermal physical and entropy increase in each component and pipe are ignored for simplicity. The basic thermal parameters of the cycles, which are based on previous works, are shown in Table 2 [22,23]. According physical parameters of the cycles, which are based on previous works, are shown in Table 2 [22,23]. to those assumptions, the change of working fluid is ideal in turbomachinery, and many losses in According to those assumptions, the change of working fluid is ideal in turbomachinery, and many turbomachinery are ignored so the efficiency of the turbomachinery is kept constant. losses in turbomachinery are ignored so the efficiency of the turbomachinery is kept constant. Table 2. Thermal physical parameters of the cycles. Table 2. Thermal physical parameters of the cycles. Parameter Values Parameter Values TurbiTnuerbininletinpleret spsruesrseure TurbiTnuerbininletintelemt tpeemrpaeturarteure CompCroemssporresisnolreitnplertepssreusrseure PC inPlCetinplreetspsruersesure 21–29MPPaa[2[2,2,32]3] ◦ CompCroemssporresinsolertintlemttpemerpaetruarteure 32–38°CC[2[2,2,32]3] Surrounding temperature 25 °C [22,23] Surrounding temperature 25 C [22,23] 0.88 [22,23] Isentropic efficiency of turbine Isentropic efficiency of turbine Isentropic efficiency of compressor 0.88 [22,23] 0.85 [22,23] Isentropic efficiency of compressor Heat exchanger effectiveness 0.85 [22,23] 0.95 [22,23] Heat exchanger effectiveness The thermal parameters of CO2 can be calculated through two independent parameters, and 0.95 [22,23] The thermal parameters of CO2 can be calculated through two independent parameters, and some 500 °C[2[2,2,32]3] 7–10.5 MPPaa[2[2,2,32]3] 5.6–6.8MPPaa[2[2,2,32]3] ◦ ◦ some parameters at a special state must be decided by iterative calculation. In this study, the parameters at a special state must be decided by iterative calculation. In this study, the thermodynamic thermodynamic calculation model for the recuperation S-CO2 cycle is introduced in detail, as calculation model for the recuperation S-CO2 cycle is introduced in detail, as follows. The set of follows. The set of Equations (1)–(9) correspond to the symbols and states shown in Figure 1 for the Equations (1)–(9) correspond to the symbols and states shown in Figure 1 for the simple S-CO2 simple S-CO2 recuperation cycle. The heat absorption capacity of CO2 is equal to the released heat of ICE exhaust, which is decided recuperation cycle. by: Φ=q (h−h )=q (h−h) (1) mmgginin outout mcom2co21 16 6 The heat absorption capacity of CO2 is equal to the released heat of ICE exhaust, which is decided by: Φq hh q hh (1)PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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