Development and Application of an Integrated Dew Point and Glass Temperature Sensor

Urbank, Thomas M.; Kelly, Sean; King, Timothy O.; Archibald, Charles A.

doi:10.4271/2001-01-0585

Cited by 13 publications

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“…This temperature was originally referred to as the ''vapor point'' or ''point of condensation,'' but the term ''dewpoint'' came into use shortly thereafter (Howard 1818;Dalton 1824). In the years since, many different analytic expressions have been proposed for the dewpoint in terms of temperature and relative humidity (e.g., Mitchell 1967;Wanielista et al 1997;Sargent 1980;Urbank et al 2001;Lawrence 2005), but only one has been derived theoretically and that one, as we will see, has errors that can exceed 1 K. This short note derives, from first principles, analytic expressions for the dewpoint and frost point that are accurate to within hundredths of a degree.…”

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Accurate Expressions for the Dewpoint and Frost Point Derived from the Rankine–Kirchhoff Approximations

Romps

2021

Journal of the Atmospheric Sciences

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Accurate, explicit, and analytic expressions are derived for the dew point and frost point as functions of temperature and relative humidity. These are derived theoretically in terms of physical constants using the Rankine-Kirchhoff approximations, which assume an ideal gas, fixed heat capacities, and zero specific volume of condensates. Compared to modern laboratory measurements, the expressions are accurate to within a few hundredths of a degree over the full range of Earth-relevant temperatures, from 180 to 273 K for the frost point and 230 to 330 K for the dew point.

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confidence: 99%