Description
Calculate the virtual temperature \(T_v\)(K) from temperature \(T\)(C), pressure \(P\)(mb) and relative humidity \(rh\)(%).
\(E_{sw}(P, T)\) is the Hardy equation for saturation vapor pressure.
Used in Aspen starting with V3.4.5.
Formula
$$
T_v = \frac{T + 273.15}{1 - h2omr * (1 - \eta)}
$$
where:
$$
h2omr = \frac{e}{P - e} \\
e = E_{sw} * (\frac{rh}{100}) \\
\eta = \frac{mh2o}{mdry} \\
mh2o = 18.105 (g) \\
mdry = 28.966 (g) \\
$$
Source
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