Abstract: “Desalination plant in marine transportation consumes large amount of fresh water for a single trip. The plant is also widely used in regions where very low rainfall but near to the sea. The most important component of a desalination plant is the evaporator. An effective and efficient evaporator will enhance the collection of condensate water which can reduce the occupied space of the plant especially for marine transportation. In this study a horizontal aluminum evaporator with varying outer roughness was used under different feeder water load. The performance of each evaporator was evaluated based on the collected amount of condensate water. In parallel with the experimental works, correlation of variables were derived based on the film wise condensation Nusselt’s equation, heat transfer equation and falling film equation. The mathematical correlation which was non-linear equation was solved using Maple software and the theoretical results were then compared to the experimental result”

Keywords: desalination, evaporator, heat transfer, condensation