 The trade-off between pre-dearation of the seawater and expulsion of non-condensable gases from the condenser is dependent on the gas evolution dynamics, deaerator efficiency, head loss, vent compressor efficiency and parasitic power.Experimental results indicate vertical spout condensers perform some 30% better than falling jet types.Because raw seawater must pass through the heat exchanger, care must be taken to maintain good thermal conductivity.