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compared to 5 kPa as expected. However, the energy consumption increases for 10 kPa compared to that of 7 kPa. For each case, the energy consumption was calculated for compressor efficiency 80%. The higher PL (i.e. lower π) is not sufficient enough to effectively regenerate the bed during the CnD and LR steps which lowers the CO2 recovery in the HP. Therefore, a higher PL means less work done by the compressor (kJ), the energy consumed (kJ/mol of CO2 produced) is high due to low CO2 recovery in the heavy product. Figure 4.9 shows the effect of energy consumption (kJ/mol of CO2 captured) for three different temperatures 25, 70 and 100 °C. The energy consumption increases by increasing temperature. From equation (12), it can be seen that the energy consumption is directly proportional to the operating temperature, which explains the increase in energy for increasing temperature. 25 20 15 10 20 40 60 80 100 Temperature [°C] Energy Figure 4.9 Effect of temperature on energy consumption 35 Energy [kJ/mol CO2]PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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