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Taller sobre medición de humedad en gases g

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Introducción<br />

• Presión <strong>de</strong> saturación <strong>de</strong> vapor <strong>de</strong> agua: Ecuaciones <strong>de</strong><br />

aproximación para la fase sólida (hielo)<br />

e(<br />

T<br />

f<br />

)<br />

⎛<br />

⎞<br />

,<br />

6<br />

i 2<br />

= exp⎜∑<br />

aiT<br />

f + a7<br />

lnT<br />

f ⎟<br />

⎝ i 0<br />

⎠<br />

−<br />

⎝ i= 0 ⎠<br />

<strong>en</strong><br />

Pa<br />

Wexler (1976, 1977) Sonntag (1990) Hardy (1998)<br />

a 0 0 0 0<br />

a 1 -5,6745359.10 3 -6,0245282.10 3 -5,8666426.10 3<br />

a 2 6,3925247 2,932707.10 1 2,232870244.10 1<br />

a 3 -9,677843.10 -3 1,0613868.10 -2 1,39387003.10 -2<br />

6 22157 10 7 1 3198825 10 5 3 4262402 10 5<br />

a4 6,22157.10-7 -1,3198825.10-5 -3,4262402.10-5 a 5 2,0747825.10 -9 0 2,7040955.10 -8<br />

a 6 -9,484024.10 -13 0 0<br />

a 4 1635019 4 9382577 10-1 6 7063522 10-1 a7 4,1635019 -4,9382577.10-1 6,7063522.10-1 U r (e(T)) ≤(0,01-0,005.t)%<br />

-100 ºC ≤t ≤ 0,01 ºC<br />

≤0,5%<br />

-100ºC ≤t ≤ 0,01ºC<br />

≤ (0,01-0,005.t)%<br />

-100 ºC ≤t ≤ 0,01 ºC

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