Application of various cooling schemes for outboard heat exchangers

Abstract

   The purpose of the article is to consider the problems of dual-circuit and single-circuit cooling systems to improve reliability.

   The article discusses the causes of accidents on ships related to flooding of engine rooms due to corrosion damage to pipes and elements in two-circuit cooling systems. It is pointed out that, despite the regulatory requirements of the Register aimed at improving the reliability of such systems, the problems of corrosion wear of pipelines remain relevant and affect the operation of ships. To completely eliminate the dangers of flooding, it is proposed to use single-circuit systems with outboard coolers more widely. The main limitation for the wider use of outboard heat exchangers is noted: a low heat transfer coefficient due to the natural circulation of outboard water in a warm box and restrictions in the Register Rules for the use of keel coolers for ice-class vessels. To expand the use of outboard coolers on ships, it is proposed to introduce a new type of cooler in the Register Rules, the definition of which is proposed to be added to the Register Rules. This will make it possible to apply less stringent requirements to such coolers compared to keel coolers, which will expand their use on ice navigation vessels. To intensify heat exchange in outboard coolers, measures are proposed to optimize the design of thermal and kingston boxes by organizing natural circulation in them or creating forced circulation of outboard water through the cooler using a water jet ejector using a fire protection system.