Engine cooling systems optimization

By Keith Henderson at June 20, 2010 13:17
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One of the many areas of interest as part of the Danish Greenship Project is reducing the energy consumption of the engine cooling systems. For the investigation, a MAN B&W engine in a 35,000 dwt bulk carrier is used to study both sea water and lubrication oil cooling systems. Project studies indicate that there is an unnecessarily high pressure drop and therefore flow resistance in the sea water cooling circuit resulting in wasteful energy consumption. By specifying a larger capacity heat exchanger the flow resistance would decrease permitting the use of smaller pumps with an energy saving that could be as much as 90 per cent and save 160 tons of CO2 per pump per year! Using a different type of oil pump and / or optimizing the flow through the lubricating oil recirculation system, around five per cent of energy can be saved, equivalent to more than 110 tons of CO2 per annum.

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