When inspecting the CAPEX in Figure (B) the first immediate observation is that switching from aircooled heat exchangers to shell and tube heat exchangers leads to higher CAPEX. For case 5-8 which employ shell and tube heat exchangers, the CAPEX is generally reduced as the cooler discharge temperature is lowered, which is easily conceived when looking at the corresponding power requirement and correspondingly less cost of compressors and refrigeration systems (also talking into account that the refrigeration loop becomes more effective when the condenser temperature is lowered i.e., higher COP). The minimum CAPEX for each case generally shifts from a pure compression case (case 2) to a hybrid compression/liquefaction/pumping case and with the minimum CAPEX occuring at gradually lower liquefaction/pumping pressure as the cooler discharge temperature is lowered.