Raw cut potato strips are dried in a drying oven operating at 60C. The raw potat
ID: 1057244 • Letter: R
Question
Raw cut potato strips are dried in a drying oven operating at 60C. The raw potatoes strips are 60% by weight water and 20kg/min of raw potatoes are fed into the drying oven. HotDryAir is fed into the oven at a rate of 1000 SCFM (standard cubic feet per minute). The HotMoistAir exiting the dryer is saturated with water and has a water content of 3.7 gm of water per cubic foot of dry air. What is the mass flow rate of water and dry potatoes (non-water part of the feed) in the WetPotato stream? What is the water flow rate in the HotMoistAir stream in kg/min? What is the water flow rate in the DryFries stream in kg/min? What is the % water content of the DryFries stream ?Explanation / Answer
a)mass flow rate of water =60% of 20kg/min=0.60*20 kg/min=12kg/min
mass flow rate of dry potatoes=20-12=8kg/min
b)water flow rate of hot moist stream =1000 ft^3 /min *3.7 g/ft^3=3700 g/min=3700/1000 kg/min=3.7 kg/min
c)water flow rate in dry fries stream=12kg/min-3.7 kg/min=8.3kg/min(as 3.7 kg is blown away by hot dry air per minute)
d)% water in dryfries stream=mass of water/total mass=(8.3 /8.3+8 )*100=50.92%
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