The implemented simulation model is tested against a number of references as well as an auto generated case. The first validation is against a simple compression model as implemented in DWSIM 8.5.1. applying the CoolProp property package. Validation and justification of DWSIM is outside the scope of the present study and can be found in, e.g., ref. . The validation case is a twostage compression process compressing 100 kg/s of pure CO 2 from 10 to 39 bar with inter-stage cooling to 40 • C and a total pressure drop, dP , of 1 bar. The isentropic efficiency in both compression stages is set to ϵ comp = 0.75. The process is shown in Figure and the results are compared in Table .