3. In a rolling mill, a 10-tonne steel coil is cooled from 900°K to 625°K by...
3. In a rolling mill, a 10-tonne steel coil is cooled from 900°K
to 625°K by spraying
with water at 32°C which is subsequently all vapourized to steam at
100°C.
a) How much water is theoretically required to effect the
cooling?
b) What is the entropy change of the steel?
c) What is the entropy change of the water?
d) How much entropy is created or destroyed in the total system of
steel plus
water?
e) Are any elements of this process reversible? Explain.
For steel: Cp = 0.75 kJ/kg/°C in the temperature range of
interest
For water: Cp = 4.18 kJ/kg/°C
ΔHv (H2O) = 2258 kJ/kg at 100°C
ΔHm (H2O) = 334 kJ/kg at 0°C
Homework Answers
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