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The negative sign indicates that work is defined as work done "by the system." Thus a negative work implies that work is done on the system. Work is defined this way because w e will eventually be using turbines to recover the energy lost during throttling. The energy recovered is then defined as positive, as it is done by the system. If we make the substitution NA = NByo / (1 - yo), we can plot the reversible work done by the system in producing 1 litre of pure species B (1 litre is 0.0409 moles at standard temperature and pressure) from gas with initial mole fraction yo. The equation we are plotting in Figure 2.2 is then: mol In'l^ +ln 1 (2.28) Vm = -RT0{ 0.0409— Reversible Work of Gas Separation yo Figure2.2 ReversibleWorkofGasSeparationDonebytheSystemasaFunctionofyo. 13PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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