scope:

Purpose and scope

The purpose of this data is to assemble psychrometric data in chart and equation form in both SI and English units.

Psychrometric charts are presented that give Data for dry bulb temperature ranges of −35 to 600 °F in English units and −10 to 120 °C in SI units.

Many analyses of psychrometric data are made on computers. The equations given in Sections 2 and 3 enable the calculation of all psychrometric data if any two independent psychrometric properties of an air-water vapor mixture are known in addition to the atmospheric pressure. In some cases, iteration procedures are necessary. In some instances, the range of data covered by the equation has been extended beyond that given in the original source. The equations yield results that agree closely with values given by Keenan and Keyes (1936) and existing psychrometric charts.