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The paper presents the chances of realization the principles of sustainable development into one of the most important components of the economy – road transportation. The article presents legal acts valid in the European Union and Poland in the fi eld of sustainable road transport, determining short-and long-term goals. Taken actions to ensure realization of existing legislation so as possible and necessary solutions, which could reduce harmful infl uence of using cars on environment untill to 2030 were outlined. The article presents a calculation of the difference in the emission of various pollutants from road transport between the conventionally powered vehicles and non-polluting vehicle – an electric cars. Afterwards the external costs resulting from the emissions of these substances were calculated. Moreover data with prices and the anticipated costs of operating vehicles using different types of engines were compared that. On this basis, conclusions concerning the economic efficiency of the purchase and operation an electric vehicle were drawn.
Steam-water injectors are devices in which exchange of mass, momentum and energy between two fluids being in direct contact, occurs.They can operate as pumps, mixers or direct contact heat exchangers. In the last aspect their use as feed-water heaters in Rankine thermal cycle of steam power plants both in land and sea applications (to merchant and naval ships) is very interesting. This paper presents selected results of heat-and-flow investigations of a supercritical steam-water injector, obtained in Institute of Fluid Flow Machinery, Polish Academy of Sciences (IMP PAN). On their basis value of average heat transfer coefficient for mixing chamber was determined; the obtained values were even a few dozens greater than those for classical shell-and-tube heaters. In the theoretical part of this work is presented an original injector model based on balances of mass, momentum and energy, written for control volumes containing separately particular elements of injector. On the basis of the model flow parameters in characteristic cross-sections of injector were determined. The calulations were performed for two different injectors tested in IMP PAN (Gdańsk) and SIET (Piacenza, Italy), and their good compliance with experimental data was achieved
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