psychrolib (version 2.5.2)

CalcPsychrometricsFromRelHum: Calculate psychrometric values from relative humidity.

Description

Utility function to calculate humidity ratio, wet-bulb temperature, dew-point temperature, vapour pressure, moist air enthalpy, moist air volume, and degree of saturation of air given dry-bulb temperature, relative humidity and pressure.

Usage

CalcPsychrometricsFromRelHum(TDryBulb, RelHum, Pressure)

Arguments

TDryBulb

A numeric vector of dry-bulb temperature in degreeF [IP] or degreeC [SI]

RelHum

A numeric vector of relative humidity in range [0, 1]

Pressure

A numeric vector of atmospheric pressure in Psi [IP] or Pa [SI]

Value

A list with named components for each psychrometric value computed:

HumRatio

Humidity ratio in lb_H2O lb_Air-1 [IP] or kg_H2O kg_Air-1 [SI]

TWetBulb

Wet-bulb temperature in degreeF [IP] or degreeC [SI]

TDewPoint

Dew-point temperature in degreeF [IP] or degreeC [SI]

VapPres

Partial pressure of water vapor in moist air in Psi [IP] or Pa [SI]

MoistAirEnthalpy

Moist air enthalpy in Btu lb-1 [IP] or J kg-1 [SI]

MoistAirVolume

Specific volume of moist air in ft3 lb-1 [IP] or in m3 kg-1 [SI]

DegreeOfSaturation

Degree of saturation [unitless]

Examples

# NOT RUN {
SetUnitSystem("IP")
CalcPsychrometricsFromRelHum(80:100, 0.13, 14.69)

SetUnitSystem("SI")
CalcPsychrometricsFromRelHum(25:40, 0.5, 101325.0)

# }