One continuously flowing stream of steam is at 2 MPa and 800°C, and another is at 1 MPa and 900°C. Which could, in principle, produce the greatest amount of useful work in a flow process?
Question 4.6-2: One continuously flowing stream of steam is at 2 MPa and 800...
Using the steam tables at 2 MPa and 800^{\circ} C : \hat{H}=4150.3 kJ / kg , \hat{S}=8.1765 kJ / kg · K, so that \hat{ B }=4150.3-298.15 \times 8.1765=1712.5 kJ / kg and at 1 MPa and 900°C
\hat{H}=4392.9 kJ / kg , \hat{S}=8.7118 kJ / kg \cdot K , \text { so that } \hat{ B }=4392.9-298.15 \times 8.7118 = 1795.5 kJ/kg
Therefore, we see that the lower pressure stream has the greater potential to do useful work due to its higher temperature.
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