The parameters sourced from Woods relevant for the present study are summarized in Table along with their applicable ranges. The cost relations are commented in the following. In case the upper limit of the applicable range is exceeded for e.g. heat exchangers, the required heat transfer area is distributed across several units with the same size, with the individual surface areas summing up to the total required surface area. The heat exchanger The applicable power, P , (kW) range in Woods for the cost relations for centrifugal compressors was proposed as [2, 4000] and [8000, 25000]. For the purpose of the present study, the two relations were extrapolated up and down, respectively, in order to cover the gap [4000, 8000] by finding the cross-over point between the two relations.