Recovering Ideal Work from an Expansion Engine - 913 Words

And the ideal work recoverable from an expansion engine as LN2 is evaporated at 77 K Additional potential remains for heat sinking by the cold N2 vapor, then brought up to ambient temperature (To = 300 K)or more, is shown or given by the difference in thermodynamic availability, ï â„¢ = h ï€ ­ sTo, between ambient states and liquid . This reversible work for liquid nitrogen LN2 is Wr = 800 kJ/kg-N2 and the relatively and corresponding sink efficiency is ï  ¢ = 1.78. Thus, for only a small fraction of the reversible work require to be recovered to gives the cryomobile with a driving range commensurate or start with that of battery- operated or powered vehicles of comparable weight. The relative merits of different ZEV technologies must also be evaluated on considerations (must) other than performance such as environmental friendliness(less emission ) and commuting utility. While the specific energy of liquid nitrogen LN2 or batteries is far below that of hydrocarbon fuels, the internal combustion engine cars cannot operate without polluting emissions and this thus should not be compared with ZEVs. ADVANTAGES Studies indicate or shows that liquid nitrogen automobiles will have relavent significant performance and environmental related advantages over an electric vehicles. A liquid nitrogen vehicle or car with a 60-gallon to 70 gallon tank will have a potential(power) range of up to 200 miles, or more than that of a typical electric car performance. One more thing isShow MoreRelatedWhat Are Stirling Engines?1536 Words   |  7 PagesWhat are Stirling Engines? Stirling engines are dynamic heat converters for converting heat energy in to work energy. They operate by the cyclic compression and expansion phases of gases and other fluids at different temperatures in such a way that heat energy is transformed in to mechanical work energy output [1]. 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