This is because the work done by or on the system and the heat added to or removed from the system can be visualized on the T-s diagram. It is used in thermodynamics to visualize changes to temperature and specific entropy during a thermodynamic process or cycle. A large number of different properties have been defined, and there are some dependencies between properties.Ī Temperature-entropy diagram ( T-s diagram) is the type of diagram most frequently used to analyze energy transfer system cycles. In general, the phases of a substance and the relationships between its properties are most commonly shown on property diagrams.
Temperature-entropy Diagrams – T-s Diagrams The fact that the absolute value of specific entropy is unknown is not a problem, however, because it is the change in specific entropy (∆s) and not the absolute value that is important in practical problems. For example, the specific entropy of water or steam is given using the reference that the specific entropy of water is zero at 0.01☌ and normal atmospheric pressure, where s = 0.00 kJ/kg. Normally, the entropy of a substance is given with respect to some reference value. In general, specific entropy is a property of a substance, like pressure, temperature, and volume, but it cannot be measured directly. Because entropy tells so much about the usefulness of an amount of heat transferred in performing work, the steam tables include values of specific entropy (s = S/m) as part of the information tabulated. M = mass (kg) T-s diagram of Rankine CycleĮntropy quantifies the energy of a substance that is no longer available to perform useful work.
It equals to the total entropy (S) divided by the total mass (m). The specific entropy (s) of a substance is its entropy per unit mass. Engineers use the specific entropy in thermodynamic analysis more than the entropy itself. The entropy can be made into an intensive, or specific, variable by dividing by the mass.
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