Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles

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Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles ( low-grade-heat-conversion-into-power-using-small-scale-organ )

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20 18 16 14 12 10 8 6 4 2 500 5.2 4.8 4.4 4 3.6 3.2 2.8 2.4 2 500 Figure 4.9 - System total irreversibility rate versus turbine inlet pressure for working fluids with (a) low normal boiling points and (b) high normal boiling points at Tc=35 °C. In the second part of the analysis, the temperature of the heat source was kept constant. As shown in Figures 4.10, the system total irreversibility decreases as the turbine inlet pressure increases. As conclusion, small temperature difference between the fluid streams improves the system‘s performance. (a) R407C R717 R290 R134a R152a RC318 1000 1500 Inlet turbine pressure [kPa] 2000 2500 3000 3500 4000 R123 R113 (b) Methanol R718 R141b Ethanol N-Pentane 1000 1500 Inlet turbine pressure [kPa] 2000 2500 3000 Page | 100 Itot [kW] Itot [kW]

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