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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Experiments to curtail CO2 emissions

By Keith Henderson at June 06, 2010 13:12
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Projects running with NYK Line ships under the Japanese Ministry of Land, Infrastructure, Transport and Tourism are investigating technological developments to curtail CO2 emissions from marine vessels. In the main project, two NYK ships, are equipped with an air blower to supply air to the vessel's bottom to reduce frictional resistance. Mitsubishi Heavy Industries supplied the engines and is also participating in the experiment. It was decided that, a module carrier, would be best type of vessel for this experiment. she has a wide, shallow-draft hull minimizing the energy required by the electrically blower supplying air to the vessel's bottom and should better retain the supplied air under the vessel's bottom.
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