Case 5 As case 2, but using shell & tube heat exchangers instead of air cooled heat exchangers. This applies to both compressor inter-stage and discharge coolers as For all cases, it is assumed that the coolant temperature is 13 • C colder that the cooled CO 2 . The results of simulating these cases, including case 2 for comparison, are shown in Figure . Key metrics for minimum power, CAPEX and LCOCC, respectively, and at which liquefaction/pumping pressure they occur, are compiled in Table .