Sep 19, 2017

THE ENTROPY OF WATER AT T TP  = 0°C, P TP  = 0.611 KPA, IS ARBITRARILY SET…

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The entropy of water at TTP = 0°C, PTP = 0.611 kPa, is arbitrarily set to equal zero. The subscript TP refers to the triple point. Using this information, determine:

a. s(liquid, 100°C) assuming c = 4.184 kJ kg–1 K–1. Compare your results with values tabulated in the steam tables (Tables A.4).

b. s(sat vapor, 0°C, 0.611 kPa) assuming hfg = 2501.3 kJ–1 kg–1 K–1.

c. The entropy generated if the water at 0°C and 0.611 kPa is mechanically stirred to form vapor at 0°C in an adiabatic blender.

d. s(393 K, 100 kPa) assuming cp,0 = 2.02 kJ kg–1 K–1 and that steam behaves as an ideal gas. For vapor, cp0 = 2.02 kJ/kg K. Compare with steam tables.

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