Water - rate of evaporation

  • #1

Main Question or Discussion Point

HVAC man here, still tinkering with humidification. Trying to get a baseline on the rate of evaporation of undisturbed water in a full container in a room with a fixed RH & temperature and no air currents. It's a cool (unheated) very small, room in my basement with a door on it. The room has been at a constant 50F & 40% RH. Used a 12 cup (untapered, i.e. perfectly cylindrical) coffee carafe and filled it with water (with no lid on it). It's 5 1/2" in diameter and 4 1/2" deep. In 18 days, the water level has dropped a measly 3/8". So it's kinda like watching grass grow.

I tried to make this as empirically simple as possible to create a "worst-case" scenario for a rate of evaporation, and to see if I could compare it to a simple formula for predicting the rate of evaporation.

Can anyone recommend a formula to compare the results of my current experiment with?
 

Answers and Replies

  • #2
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It is not clear whether the bulk humidity in the room is being maintained at 40%, or whether the air is being allowed to become more saturated.
 

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