Two streams of water flow into a tank, one at 80ºC flowing with a rate of 2 kg/s and the other at 50ºC flowing with a rate of 4 kg/s. All flows are at the same pressure. The tank is insulated, there is one outlet and the temperature and volume of water in the tank remain constant. The entropy generated is nearest:
A) 0.165 kJ/Ks?s
B) 0.225 kJ/Ks?s
C) 0.375 kJ/Ks?s
D) 0.415 kJ/Ks?s
A) 0.165 kJ/Ks?s
The first law is written as
where the enthalpies are found in Table C-1 since the water is compressed liquid (pressure is of no consequence for a compressed liquid). The exiting temperature is then observed in Table C-1 to be 30ºC. The entropy generated follows:
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