A ‘‘cooling bag,’’ commonly used for storing water in hot, arid environments is made of a thin…

A ‘‘cooling bag,’’ commonly used for
storing water in hot, arid environments is made of a thin porous fabric. A
small amount of water diffusesthroughthe fabric and evaporates from the surface
of the bag. The rate of evaporation is controlled by convective mass transfer
from the outer surface of the fabric to the surrounding dry air. The energy for
evaporation is supplied by the surrounding hot air. The evaporation of the
water cools the remaining liquid water within the bag and a temperature driving
force is established. Determine the temperature of the ambient air using
mass-transfer
»

A ‘‘cooling bag,’’ commonly used for
storing water in hot, arid environments is made of a thin porous fabric. A
small amount of water diffusesthroughthe fabric and evaporates from the surface
of the bag. The rate of evaporation is controlled by convective mass transfer
from the outer surface of the fabric to the surrounding dry air. The energy for
evaporation is supplied by the surrounding hot air. The evaporation of the
water cools the remaining liquid water within the bag and a temperature driving
force is established. Determine the temperature of the ambient air using
mass-transfer considerations, if the following values hold:

»

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