Week10partb

Week10partb - Lecture notes week 10 (part b). Use of...

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1 Lecture notes week 10 (part b). Use of Thermodynamic Tables Properties for saturation, superheat, and compressed states are available for many pure substances. Common property tables available in the back of Thermodynamic texts are for H 2 O, Refrigerants 12, 22 and 124a, and Ammonia. The physical property tables list sets of the p , v , T data as well as the specific internal energy ( u ), enthalpy ( h ) and entropy ( s ) data at convenient intervals of T or p . The intervals are spaced sufficiently close to allow linear interpolation between the listed data sets. For the time being let us focus on the p, v, T data. The first step in the use of this data is to identify a given state so that we can use the appropriate table. Note that: two independent properties are needed to define a state of a pure substance, and that any two such variables are sufficient. in the saturation region (inside the saturation dome) , T and p are not independent . To use these tables effectively, it is helpful to sketch T–v diagram or a p–v diagram with the saturation dome clearly shown, as below: Critical point Saturated vapor curve Saturated liquid curve T v
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2 The p-v diagram: On the T-v diagram, draw an arbitrary constant pressure, p , line. Note the positive slope of the constant pressure line.
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Week10partb - Lecture notes week 10 (part b). Use of...

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