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CO2 flow at the outlet of the compressor (state 2) is split into two streams. The first stream (m1) is heated to the maximum cycle temperature (state 3) in the heater and expanded in the high temperature turbine, HTT (3–4). The second stream (m2) is heated to the inlet temperature of the low temperature turbine, LTT (state 7), in two recuperators (LTR and HTR) in sequence. The CO2 flow Elenaervginesg20t2h0e, 1H3,T37T0is cooled in the HTR (4–5) and mixed with the exhaust from LTT. The total CO29folof w31 is cooled in the LTR (9–10) and cooler (10–1) down to the desired compressor inlet state. Energies 2020, 13, x 9 of 31 This highly integrated system can be thought of as being composed of two partially superimposed elementary Brayton cycles: A topping non-recuperated cycle (Figure 2a) and a bottoming recuperated cycle (Figure 2b). The two elementary thermodynamic cycles share the cooler and the compressor and interact through the HTR and LTR. In the topping cycle, CO2 is heated from the compressor outlet to the inlet of the HTT by the external heat source. In the bottoming cycle, CO2 is heated from the compressor outlet to the inlet of the LTT primarily by recovering the exhaust heat from the HTT (in HTR and LTR) and, partially, by recovering the exhaust heat from the LTT (in LTR). Thus, the LTR has a double function: Not only does it recover the low temperature exhaust heat from the topping cycle but it also recovers internally the exhaust heat within the bottoming cycle. Figure 1. Single flow split with dual expansion s-CO2 cycle [36]. Figure 1. Single flow split with dual expansion s-CO2 cycle [36]. (a) (b) Figure 2. Decomposition of the single flow split with a dual expansion s-CO2 cycle into two Figure 2. Decomposition of the single flow split with a dual expansion s-CO2 cycle into two elementary elementary thermodynamic cycles: (a) First elementary cycle (topping); (b) Second elementary cycle thermodynamic cycles: (a) First elementary cycle (topping); (b) Second elementary cycle (bottoming). (bottoming). In the schematic representation of the elementary cycles in Figure 2, the thermodynamic processes In the schematic representation of the elementary cycles in Figure 2, the thermodynamic are drawn using different colors. The red color refers to the heat input from the external heat source, processes are drawn using different colors. The red color refers to the heat input from the external the blue to the heat rejection to the environment, the green to the regenerative heat transfer within each heat source, the blue to the heat rejection to the environment, the green to the regenerative heat elementary thermodynamic cycle, and the violet to the heat transfer from the topping to the bottoming transfer within each elementary thermodynamic cycle, and the violet to the heat transfer from the elementary cycle. topping to the bottoming elementary cycle. 2.1.2. Partial Heating s-CO2 Power Cycle 2.1.2. Partial Heating s-CO2 Power Cycle Figure 3 shows the layout of the partial heating s-CO2 cycle. The total CO2 flow at the outlet of thecFoimgupres3soshroiswssptlhiteinlatyootuwtofstrheeampasrthiaalthaeraetihnegatse-CdOin2 cpyacrlael.leTlhteotaontailnCteOrm2 felodwiataetttehmepoeurtaletutroef. tThheecfiormstpsrtersesaomr i(sms1p)list ihnetaotetwd otosstrteaatem3sbthyatthaerexhteranteadl hineapt asroaullrecletionahneainteterr1m, wedhiaerteatsemthpeesreactuonred. Tsthreafmirs(tmst2r)eiasmhe(mat1e)distohesattaetde 4toinstathte3rebcyuptheeraetxotrerbnyalrehceoavtesroinugrceinitnerhneaaltlyert1h,ewhheearteatstthetsuercboinde setxrheaumst(.mA2)fteisr hmeiaxtiendg (tostasteat5e),4thine ttohtealrCecOu2pfleroawtoirs bhyeartecdobvyertihnegeixntterrnaallhlyeatht seohueracet iant the htuearbteirne2 e(5x–h6a)uspt.tAoftheertmuirxbiinge(instlaetete5m),ptheeratoutrael.CTOhe2 ftluorwbiniseheexahtaeudstbyistchoeoleexdteirnntahlehreeactuspoeurracteorin(7t–h8e)haneadteinr 2th(e5–c6o)oulepr t(o8–t1h)eitnusrebqinuenincletdtoewmnpteoratthuered.eTsihredtucrobminperexsshoaruisntliestcsotaotle.d in the recuperator (7–8) and in the cooler (8–1) in sequence down to the desired compressor inlet state.PDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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