Abstract
The release of non-condensable (NC) gases, especially CO 2 in multiple-effect distiller (MED) for seawater desalination has been barely investigated and has very less publications available in it. NC gases which are carbon dioxide (CO 2), oxygen (O 2) and nitrogen (N 2) notably affect the heat transfer for condensation zone, energy consumption, the performance and material life span of the distillers. The understanding of CO 2 release in MED is very important knowledge for design and better operation of desalination distillers. The present paper describes a model of CO 2 release and the carbonate system in falling film horizontal tube-evaporators, physical properties of seawater and following correlations. The model was applied 5-effects MED, operating at top brine temperature (TBT) of 60–75 °C. The CO 2 release rates as well as depend on the salinity and top brine temperature of the inlet seawater and the specific CO 2 release decreased first to last effect.
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