Due to growing concern about the environment, the IMO (International Maritime
Organization), through MARPOL (International Convention for the Prevention of
Pollution from Ships), has developed the first mandatory regulation of the area
about the energy efficiency of ships aiming the reduction of greenhouse gases
emissions and costs related to energy consumption. This dissertation proposes a
methodology of energy efficiency measures in a patrol ship of the Navy of Brazil.
The analyzed ship, the P-49 or Guarujá, is a 19 years old vessel just as almost all
its equipments. The Guarujá is electrically a isolated propulsion system from the
power generation, then the target of this research were those systems with the
highest electricity demand: the lighting system, cooling, electric power generation,
saving and cold storages. However, the information available above those
systems have proven scarce, thus it was exploited only the bulbs and some
compressors and fan motors. The actions proposed to equipment available
verification were 1. the exchange of the reference case bulbs with LED lamps; and
2. replacing the engines with similar specimens of higher yield. They were
analyzed financially and environmentally by RETScreen software, an important
tool for energy efficiency and renewable sources studies developed by the
Government of Canada; with the aid of PROCEL simulator, BD Motor, promoting
greater focus on the engines due to its complexity and significance in the optimal
functioning of the ship's systems. The actions proved viable, with the total
turnaround time of two years, reducing emissions by 164 tCO2 in 20 years and
saving about R$ 352,974.80 at the end of the project time, thus justifying their
implementation.
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