... seawater for fresh water production, Heat recovery, Heat exchange to air-condition the passengers’ cabins and freight spacesOthers:turbine oil cooler, ... wide temperature difference, e.g. from 10 to 70°C (50 to 158°F), the high steam velocity causes erosion and noise ... when heating water only a few degrees, the PHE has to be oversized to keep the secondary side (water) pressure drop within reasonable ...