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Ship Energy Efficiency Performance Estimation Using Normal Daily Report Operational Data

Rajendra Prasad Sinha and Pragasen T Kunjambo

A ship is designed to consume ceratin amount of fuel to meet its business objective. But as operating hours build up the state of machinery and surface condition of underwater hull change resulting in increased fuel consumption and rising operating cost. This calls for close monitoring and regular energy efficiency analysis of the ship’s energy systems. A true comprehensive energy analysis of the ship requires taking into consideration energy flow across each major power producing and consuming components of the energy systems including those originating from environmental and human factors such as hull fouling, wind, wave, current, ship’s draft, and sea temperature. The overall impact of all these factors on ship’s energy demand is extremely complex and have been rarely ever correctly assessed. The most effective approach so far to ship energy performance analysis/monitoring has been to quantify the contribution of each energy element by removing the effects of remaining. The authors in this paper conduct heat balance analysis of the steam power plant and apply filtering technique to the data from ship’s daily report to assess the effects of external factors such as hull fouling trim and wind resistance on fuel consumption to estimate the overall energy efficiency performance (EEP) of an LNG ship.