Wet solids pass through a continuous dryer. Hot dry air enters the dryer at a rate of
40...
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Engineering, 07.04.2020 16:25 jcarver2494
Wet solids pass through a continuous dryer. Hot dry air enters the dryer at a rate of
400 kg/min and picks up the water that evaporates from the solids. Humid air leaves
the dryer at 50°C containing 2.44 wt% water vapor and passes through a condenser in
which it is cooled to 10°C. The pressure is constant at 1 atm throughout the system.
a) Draw a diagram of the process.
b) At what rate (kg/min) is water evaporating in the dryer?
c) Use the psychrometric chart to estimate the wet-bulb temperature, relative
humidity, dew point, and specific enthalpy of the air leaving the dryer.
d) Use the psychrometric chart to estimate the absolute humidity and specific
enthalpy of the air leaving the condenser.
e) Use the results from part (b) and (c) to calculate the rate of condensation of
water (kg/min) and the rate at which heat must be transferred from the
condenser (kW).
f) If the dryer operates adiabatically, what can you conclude about the
temperature of the entering air? Briefly explain your reasoning. What
additional information if any would you need to calculate this temperature?
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