Question: A 250 kg.h-1 wet solid with 20 wt% (wet basis) moisture content is fed to a counter current continuous dryer as shown in the diagram

A 250 kg.h-1 wet solid with 20 wt% (wet basis) moisture content is fed to a counter current continuous dryer as shown in the diagram below. The volumetric flowrate of the inlet warm air is 12.5 m3.min-1. The dry bulb temperature of the inlet air is 57 C, and its humidity is 0.02 kg.kg-1. The air exiting the dryer has a humidity of 0.06 kg.kg-1. The whole process takes place at atmospheric pressure (1 atm). Assume ideal gas applies and that R = 8.314 kPa.m3.kmol-1.K-1. Using a psychometric chart (i) Find the relative humidity, wet-bulb temperature and dew point of the inlet air supplied to the dry. (ii) Calculate the moisture content (wt%) of the dried solid leaving the dryer.

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