Discussion
Evaporating 1 tonne of water requires about 2260 MJ, which is
Answer: A
Correct answer: 628 kWh
One kilowatt hour is 3.6 MJ, so \[ \frac{2260}{3.6} = 628\ \mathrm{kWh}. \] The figure explains why drying is so costly: removing a tonne of water takes more energy than most processes put into a tonne of product, and it is why mechanical dewatering is always preferred to thermal drying where it is possible.
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