Verification by Real Ship Sea Trial

CCS has performed the real ship sea trial for the optimal trim application together with China Shipping Group, whose 4250TEU ship in service was selected as the test ship. Its major parameters are as follows:

During sea trial, this ship is bound for Tianjin Port from Nansha Port, Guangzhou, with the departure draft of 8.7m. The test is performed in the Yellow Sea area at north latitude 34°. To ensure the accuracy of test results, this trial is implemented subject to the international ship and maritime technical standard ISO15016:2002(E). The ship speed, main engine revolution, main engine shaft torque, main engine shaft power and other parameters are respectively measured under three different trim conditions, namely, trim by bow, flat floating and trim by stem. To eliminate the influences from wind wave, the ship takes an S-shaped fore-and-aft movement, and the error of readings is reduced by making average reading. According to the sea trial results, when the ballast water is increased by 1800t and the trim condition is changed to trim by bow of 0.8m, the required main engine power is reduced by 910KW with the speed unchanged, and the total fuel consumption is reduced by 14t with a reduction of fuel cost by 70,000RMB, which is equal to an average reduction by nearly 20,000RMB per day. The energy saving rate is 9.2%.

Based on comprehensive consideration of the ship trim adjustment scope and the all year round operation mode, the adoption of the optimal trim has helped the ship to achieve 5-8% energy-saving potential for its operation during the whole year, with average fuel consumption being reduced by 3.2 ton/day and CO2 emission reduced by 9.96 ton/day. Taken effective operation of the year as 200 days, 640 tons of fuel can be saved effectively for the whole year, and fuel cost per ship/year can be reduced by 3.2m RMB on assumption that fuel costs 5000 RMB per ton. Serial ships and sister ships can achieve scale benefits. Long time use of OTA can effectively change the operation habit of crew, make advance planning to realize optimal trim, lower demand for main engine power, save fuel, reduce carbon emission and achieve long-term benefits.

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