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Energies 2020, 13, x 25 of 31 Energies 2020, 13, 370 25 of 31 Table 10. Breakdown of the exergy losses/destructions for the three advanced s-CO2 power cycles for WHR. All values are in kW. Table 10. Breakdown of the exergy losses/destructions for the three advanced s-CO2 power cycles for WHR. All values are in kW. Partial Heating Dual Recuperated Recuperator 153.7 153.3 331.4 331.4 164.7(HTR)/166.7(LTR) 188.6 188.6 115.7 Heater Heater Turbine Turbine 166(HEATER1)/ Cooler 46.8(HTT)/83.2(LTT) 185.6 197.5 65.5(HTT)/50.3(LTT) 178.7 Cooler 185.6 197.5 178.7 Mixer 0.03 0.04 0.24 Mixer 0.03 0.04 0.24 Meecch//Electr 779.95.5 808.20.2 76.1 Stack 96.7 99.7 366.5 Stack 96.7 99.7 366.5 Total 1010 1073 1312 Total 1010 1073 1312 Single Flow Split with Compressor Dual Expansion Single Flow Split with 63.1 64.8 55.3 Dual Expansion Partial Heating Dual Recuperated Compressor Recuperator 63.1 64.8 15334.3.3 55.3 67.4(HTR)/86.3(LTR) 153.7 67.4(HTR)/86.3(LTR) 302.0 302.0 130.0 164.7(HTR)/166.7(LTR) 130.0 177.3(HEATER2) 134.3 134.3 115.7 46.8(HTT)/83.2(LTT) 65.5(HTT)/50.3(LTT) 343.3 16767(.H3(EHAETEART1E)/R2) Fiigurre 1166. . Exergy llosses//desttructiions iin pllantt ccomponentts fforr tthheess-C-CO2 powerr ccycclless:: Single flflow 2 split with dual expansion (blue bars), partial heating (orange), and dual recuperated (green). split with dual expansion (blue bars), partial heating (orange), and dual recuperated (green). The thermal profiles in the heaters (Figure 17) of the three s-CO power cycles contain the 2 The thermal profiles in the heaters (Figure 17) of the three s-CO2 power cycles contain the information about the exergy destruction in the heat transfer between the external heat source and information about the exergy destruction in the heat transfer between the external heat source and the high-pressure supercritical CO and about the exergy loss in the stack. The dual recuperated 2 the high-pressure supercritical CO2 and about the exergy loss in the stack. The dual recuperated cycle cycleshowstheminimumaveragetemperaturedifferencebetweensupercriticalCO andwasteheat shows the minimum average temperature difference between supercritical CO22and waste heat source, which, however, leave the heater at the highest temperature (Figure 17c). The high specific heat source, which, however, leave the heater at the highest temperature (Figure 17c). The high specific ofthehigh-pressuresupercriticalCO attemperatureslowerthan150◦Cimpliesanincreaseofthe 2 heat of the high-pressure supercritical CO2 at temperatures lower than 150 °C implies an increase of temperature difference within the heater of the single flow split with a dual expansion cycle compared the temperature difference within the heater of the single flow split with a dual expansion cycle to the minimum of 50 ◦C reached at the two ends (Figure 17a). In the partial heating cycle, the staging compared to the minimum of 50 °C reached at the two ends (Figure 17a). In the partial heating cycle, of the heater improves the thermal match at lower temperatures (heater 1), but the moderate optimum the staging of the heater improves the thermal match at lower temperatures (heater 1), but the turbine inlet temperature implies a divergence of the two thermal profiles at higher temperatures moderate optimum turbine inlet temperature implies a divergence of the two thermal profiles at (heater 2) (Figure 17b). higher temperatures (heater 2) (Figure 17b).PDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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