04 Apr 2014

SYNERGASIA 2011 ECOMARINE (11SYN-7-665)

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ecomarine

Similar to aircraft applications, the reduction of fuel consumption in marine power systemsis of great importance, because it leads to reduction in CO2, NOx and SO2emissions, in travel costs and so to optimal use of fossil fuels. Moreover, the ship autonomy becomes higher. Ship emissions of NO2, CO, NMVOCs and SO2and primary particles cause problems in coastal areas and harbours with heavy traffic and high pollution levels because of their impacts on human health and materials. Particularly high surface increases of short-lived pollutants like NO2 are found close to the regions with heavy traffic. Absolute increases in surface ozone (O3) due to ship emissions are pronounced during summer months, with large increases found in regions with heavy traffic. Some of these regions already suffer from high ozone levels due to pollution from nearby land sources. These facts are especially relative in the case of Greece, a maritime nation with busy ports and sea routes, boasting the largest fleet in the EU (Greek flag) and even world-wide (Greek-owned). Until now, the most common energy saving solutions, which have been applied in naval power systems, were based on the cogeneration of heat and power scheme (Waste Heat Recovery – WHR systems). Additionally, a recent energy saving concept for marine power systems is based on the introduction of an exhaust gas boiler that supplies steam to a steam turbine, increasing so electrical energy production about 10% (Exhaust Gas Recirculation – EGR systems).

During this project, in order to maximize electricity production by waste heat recovery (WHR) and to simultaneously improve electric power quality, we shall study the introduction of a supplementary thermoelectric energy recovery unit. In more details, the heat of the produced gases can be directly converted to electrical energy with the use of a thermoelectric generator. It is worth mentioning that energy recovery using thermoelectric generators has already been implemented in automotive vehicles, while ITC and its partners work in parallel for its implementation in aircrafts and rotorcrafts. Consequently, with the use of the above energy recovery system, fuel consumption as well as emissions will be decreased, improving so the efficiency of the marine power system. The final system will be tested in the laboratory and in situ to accurately assess its applicability in retrofitting and new shipbuilding operations (www.eco-marine.gr ).

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