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?

Answers: 1

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Wet solids pass through a continuous dryer. Hot dry air enters the dryer at a rate of

40...