![]() ![]() ![]() ![]() Note: In this calculation we are neglecting changes in kinetic and potential energies. af: Availability (exergy) of a flowing stream (or specific flowability) s: Entropy. Although this result was obtained for a particular case, its validity can be shown to be far more general: There is no net change in the entropy of a system undergoing any complete reversible cyclic process. Now let’s discuss the second law efficiency for turbine and compressor. There is no net change in the entropy of the Carnot engine over a complete cycle. Problem - Calculate the entropy of 1 mole of helium at standard temperature pressure, assume that all the atoms. A summary of these three relations is provided in Table 19.4.1. However, we know that for a Carnot engine, These results lead to a profound statement regarding the relation between entropy and spontaneity known as the second law of thermodynamics: all spontaneous changes cause an increase in the entropy of the universe. ![]()
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