TrenchR (version 1.1.1)

DRYAIR: Properties of Dry Air

Description

The function calculates several properties of dry air and related characteristics shown as output variables below. The program is based on equations from List1971;textualTrenchR and code implementation from NicheMapR Kearney2017,Kearney2020TrenchR.

The user must supply values for the input variables db, bp, and alt. If alt is known (-1000 < alt < 20000) but not BP, then set bp = 0.

Usage

DRYAIR(db, bp = 0, alt = 0)

Value

Named list with elements

• patmos: numeric standard atmospheric pressure (Pa)

• density: numeric density (kg m^-3)

• visdyn: numeric dynamic viscosity (kg m^-1 s^-1)

• viskin: numeric kinematic viscosity (m² s^-1)

• difvpr: numeric diffusivity of water vapor in air (m² s^-1)

• thcond: numeric thermal conductivity (W K^-1 m^-1)

• htovpr: numeric latent heat of vaporization of water (J kg^-1)

• tcoeff: numeric temperature coefficient of volume expansion (K^-1)

• ggroup: numeric group of variables in Grashof number (m^-3 K^-1)

• bbemit: numeric black body emittance (W m^-2)

• emtmax: numeric wave length of maximum emittance (m)

Arguments

db

numeric dry bulb temperature (C).

bp

numeric barometric pressure (Pa).

alt

numeric altitude (m).

References

Examples

  DRYAIR(db = 30, 
         bp = 100*1000, 
         alt = 0)