A drier is to be designed to reduce the water content of copra om 180% to 10%. The available air is at 21.11 degree C (700F) d has an absolute humidity of 0.01 kg water per kg city solid. order to produce the desired drying conditions, the air is ated to 48.8 degreec (1200F) before it enters the drier. The it air will leave at 43.3 degree C(I 10 degree F) with 70% RH. the basis of 1 metric ton ofproduct per hour, calculate the

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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1. A drier is to be designed to reduce the water content of copra
from 180% to 10%. The available air is at 21.11 degree C (700F)
and has an absolute humidity of 0.01 kg water per kg city solid.
In order to produce the desired drying conditions, the air is
heated to 48.8 degreec (1200F) before it enters the drier. The
exit air will leave at 43.3 degree C(I I0 degree F) with 70% RH.
On the basis of 1 metric ton ofproduct per hour, calculate the
following:
A. Cubic meter per kilogram dry air entering the air heater
B. Cubic meter per second of air entering the drier
C. Wattage of the air heater
D. Wattage of the heating coil inside the drier; and
E. Total energy consumption in terms of kJ/kg water
evaporated
Assume negligible heat loss to surrounding and neglect heat
required to heat residual water and bone dry solid.
Transcribed Image Text:1. A drier is to be designed to reduce the water content of copra from 180% to 10%. The available air is at 21.11 degree C (700F) and has an absolute humidity of 0.01 kg water per kg city solid. In order to produce the desired drying conditions, the air is heated to 48.8 degreec (1200F) before it enters the drier. The exit air will leave at 43.3 degree C(I I0 degree F) with 70% RH. On the basis of 1 metric ton ofproduct per hour, calculate the following: A. Cubic meter per kilogram dry air entering the air heater B. Cubic meter per second of air entering the drier C. Wattage of the air heater D. Wattage of the heating coil inside the drier; and E. Total energy consumption in terms of kJ/kg water evaporated Assume negligible heat loss to surrounding and neglect heat required to heat residual water and bone dry solid.
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