Starting with power in Figure (A) it is as expected that case 2 and case 5 have identical power requirement. As the discharge temperature is gradually lowered, so is the power requirement. This is also as expected and in agreement with the findings of Dlamini et al. who observe a 4.5% decrease in compression power by reducing coolant temperature by 10 • C. In the present study, a similar decrease in cooling temperature (from case 5 to case 7) results in a 4.3% decrease in power requirements, which is in good agreement. For case 7 and case 8, the power requirement drops significantly at a pumping pressure of approx. 145 bar and 125 bar, respectively. The reason for this drop is that the applied inter-cooler discharge temperature, 30 • C and 25 • C, respectively, actually leads to liquefaction upstream the last compression stage. The corresponding saturation pressures are 72.1 bar and 64.3 bar, respectively. This effectively makes the last compression stage a pumping stage, and in reality, case 7 and 8 have 2 pumping stages. Due to this "artifact" the power requirement data where this occurs has been omitted from the metrics shown in Table . It is also noticed that the spike in power requirement, just above the critical pressure for case 2, is reduced and diminishes when the discharge temperature is reduced below the critical temperature, making the pumping occur in the dense phase region rather than the supercritical region.