Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

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Novel Supercritical CO2 Power Cycles for Waste Heat Recovery ( novel-supercritical-co2-power-cycles-waste-heat-recovery )

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Eneerrgiieess 2020,, 13,, x370 Energies 2020, 13, x 2266ooff3311 26 of 31 (a) (a) (b) (b) (c) (c) Figure 17. Temperature–heat load diagram in the heater/s of the s-CO2 power cycles: (a) Single flow Figure 17. Temperature–heat load diagram in the heater/s of the s-CO2 power cycles: (a) Single flow Figure 17. Temperature–heat load diagram in the heater/s of the s-CO2 power cycles: (a) Single flow split with dual expansion; (b) partial heating; (c) dual recuperated. split with dual expansion; (b) partial heating; (c) dual recuperated. split with dual expansion; (b) partial heating; (c) dual recuperated. The thermal profiles in the recuperators are shown in Figure 18. There is a high mismatch in The thermal profifiles in the recuperators are shown in Figure 18. There is a high mismatch in both recuperators of the dual recuperated cycle due to the difference in the heat capacity flowrates both recuperators of the dual recuperated cycle due to the difffference in the heat capacity flflowrates between the hot and cold side, which is more pronounced in the LTR (Figure 18c). The thermal match between the hot and cold side, which is more pronounced in the LTR (Figure 18c). The thermal match is improved in the recuperator of the partial heating cycle (Figure 18b) and in the LTR of the single is improved in the recuperator of the partial heating cycle (Figure 18b) and in the LTR of the single flow split with a dual expansion cycle (Figure 18a), where the entire mass flow rate of CO2 on the hot flflow splitwiitthaduuaalleexxppaannsisoionncycyclcele(F(iFgiugruere181a8)a,)w, whehrertehtehenetinrteirmeamssasflsoflworwatreaotef CoOf C2 oOn tohne hthoet 2 side compensates for the lower specific heat. It is noteworthy that in all layouts, the heat of CO2 at hsiodtescidoemcpoemnspaetnesaftoerstfhoertlhoewleorwseprescpifeicihfiecaht.eIatt.isItniostnewotoerwthoyrththyathiantainllalallyloauytosu,tsh,etheahteaotfoCfOC2Oat 2 the turbine/s exhaust is completely recovered so that the exergy loss in the cooler is minimized. This athtethtuertbuirnbei/nse/xsheaxuhsatuistciosmcopmletpeleyterleycorveceorevderseodthsoattthhaetethxeregxyelrogsyslionstshienctohoelecroioslmerinisimiizneidm.iTzheids. demonstrates that the heat recovery from the waste heat source at low temperatures does not Tdhemisodnesmtroantesstrtahteast thaeththeeathereactorveecoryvefryomfrotmhethweawstaestheehaetastosuorucreceatatlolowwtteempeerraattuurreessdoesnot jeopardize the internal (regenerative) heat transfer and, ultimately, the thermal efficiency of these jeopardize the internal (regenerative) heat transfer and, ultimately, the thermal effifficiency of these advanced cycles. advanced cycles. (a) (a) (b) (b) Figure 18. Cont.

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