|Nov21-12, 09:27 AM||#1|
Relative humidity calculations.
This is totally pissing me off, I don't know what the heck am I doing wrong.
Alright, so I was given a temperature of 30°C at 30% relative humidity. I have to get the absolute humidity-
So I used Antoine; log(P)=7.96681-1668.21/(228+30); P = 31.6869mmHg.
0.3 x 31.6869 = 9.41517; 9.41517/(760-9.41517) = 1.25x10^-2.
Apparently the correct answer is 7.86x10^-3; and an air-water psychrometric chart says 0.008. What on earth am I doing wrong?
EDIT: Nevermind, I forgot that I have to multiply y 18/29.
|Nov21-12, 07:35 PM||#2|
|Nov23-12, 01:42 AM||#3|
The Antoine constants you used are also valid from 60C to 150C.
For temps of 0C to 60C, the following constants are used:
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