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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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1900 180 Evaporator Fluid Condenser 1800 1700 1600 1500 1400 160 1300 1200 1100 1000 175 170 165 155 150 145 900 140 4 6 8 10 12 14 16 18 20 Pev[bar] Figure 7.13 - Variation of the heat exchangers and working fluid costs In Figure 7.14 the cost variation of active components with evaporating pressure is illustrated. If the pressure drop in the evaporator is neglected, the evaporating pressure equals the pump discharge pressure, and the expander inlet pressure. The pump cost increases progressively, reaches a maximum at about 14 bar while the expander cost decreases gradually. The variations observed for both components are due to the density of the fluid at different states. For the same pressure, the pump discharges pressurized liquid while the expander sucks superheated vapour. 8000 700 Expander Pump 7000 6000 5000 680 660 640 620 4000 600 3000 2000 1000 580 560 540 520 0 500 4 6 8 10 12 14 16 18 20 Pev[bar] Figure 7.14 - Variation of the pump and expander costs with the evaporator pressure Page | 181 Cexp[€] Ccd, Cev[€] Cp[€] Cwf[€]

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