Discussion
Drying efficiency of a hot air dryer is usually expressed as
Answer: C
Correct answer: Heat used in evaporation over heat supplied
Drying efficiency is the fraction of the heat supplied that actually goes into evaporating water:
\[ \eta = \frac{m_w h_{fg}}{Q_{supplied}} \times 100 \]
The remainder is lost in the exhaust air as sensible heat, in heating the product itself, and through the structure. Typical hot air dryers achieve somewhere between 40 and 60 per cent, which is why exhaust recirculation and heat recovery are worth doing. Moisture removed over moisture present is a measure of drying extent, not of energy use.
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