DRYAIR: Properties of Dry Air

In trenchproject/TrenchR: Tools for Microclimate and Biophysical Ecology

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 \insertCiteList1971;textualTrenchR and code implementation from NicheMapR \insertCiteKearney2017,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)

Arguments

db	numeric dry bulb temperature (C).
bp	numeric barometric pressure (Pa).
alt	numeric altitude (m).

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)

References

\insertAllCited

Examples

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

trenchproject/TrenchR documentation built on Oct. 10, 2023, 10:12 p.m.