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Hot water is required as utility in a certain bioprocess. 10,000 g/h water at 28oC enters...

Hot water is required as utility in a certain bioprocess. 10,000 g/h water at 28oC enters an open heating tank, where heated up to 80oC. 11% of this water is lost from the system via evaporation.

a. Construct the mass balance in order to calculate how much water is evaporated and how much water is leaving the tank.

b. What must be the rate of heat input to the system at steady-state?

h (liquid water at 28oC) = 117.3 kJ/kg

h (liquid water at 80oC) = 334.9 kJ/kg

h (saturated steam at 80oC) = 2643.8 kJ/kg

Evaporation occurs at 80oC

Engineering   Chemical-Engineering   
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Answer #1

This problem is based on mass and heat balance applied on the tank water. Proceed as follows:

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