Simplified method of water cooled exhaust system design and performance assessment

The water cooled exhaust systems are not often used onboard ships. Prime goal is to lower temperature of exhaust gas from main propulsion and auxiliary engines to the defined limit. The design of such systems require detailed analysis of propulsion system operational parameters to meet designer expectations. The paper outlines the cooled exhaust system design problems in specific application. The simplified method of evaluation of expected cooling water flow requirements has been developed. Based on marine diesel engines test bench data, the results of short analysis of cooling water demand for two different diesel engines are presented. A simplified engineering approach may be useful for assessment of exhaust gas cooling system performance in commercial application like rescue vessels wet exhaust design or exhaust gas cleaning systems.