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Now, environmental issues are the mostly discussed issue and become a top priority in the world. Whether it’s environmental damage or environmental pollution. The issue of pollution and damage to the environment and ecology in the region, which have an impact on living organisms, both humans, animals and plants. Environmental damage and pollution can occur on land, water, and air. With various forms of damage and pollution, the methods of handling are different. This research will focus on damage and pollution in waters as well as methods of handling and prevention, especially in marine waters. This research focuses on designing a heat exchanger by varying its types, namely shell and tube heat exchanger. From the modification of model, it will be known which one is more effective in performance. Both temperature exchange, pressure drop, flow rates, dimensions and materials are simulated by software. Where these parameters are influenced by the characteristics of the ship’s power of main engine. From 2 model of shell and tube heat exchanger that are one pass-shell and two pass-shell the result for case 1 the effectiveness are 92% &amp; 93%, case 2 are 93% &amp; 94% and case 3 are 94% &amp; 95%.

Design of shell and tube heat exchanger for ballast water treatment applications on ships based on simulation