An infection control room in a hospital has dimensions 4m x 6m x 3m. The temperature in the room is 20 C. The relative humidity in the room 80%. Overnight, the temperature of the window surfaces drops to 14 C.
A) what is the moisture content in the room?
B) What is the minimum of water that a dehumidifier must remove such that condensation will not occur on the windows overnight?
(A) Saturation vapour density at 200 C = 17.3 g/m3
Putting the values
80/100 = Actual vapour density/17.3
Actual vapour density (moisture content) = 13.84 g/m3
(B) At 140 C the saturation vapour density = 12.07 g/m3. For the condensation to not occur the minimum excess moisture = 13.84 - 12.07 = 1.77 g/m3 has to be removed from the room.
Hence the minimum water to be removed from the room = 1.77 g/m3 x (4m x 6m x 3m)
= 127.44 g
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