calcdTNZ: dTNZ, the Distance from the Thermoneutral Zone

In comf: Models and Equations for Human Comfort Research

dTNZ, the Distance from the Thermoneutral Zone

Description

calcdTNZ calculates the distance from the thermoneutral zone, either skin temperature or room air related.

Usage

calcdTNZ(ht, wt, age, gender, clo, vel, tskObs, taObs, met, rh, deltaT =.1, 
fBasMet = "rosa", fSA = "duBois", percCov = 0, TcMin = 36, TcMax = 38, 
plotZone = FALSE)

Arguments

ht	a numeric value presenting body height in [cm]
wt	a numeric value presenting body weight in [kg]
age	a numeric value presenting the age in [years]
gender	a numeric value presenting sex (female = 1, male = 2)
clo	a numeric value presenting clothing insulation level in [clo]
vel	a numeric value presenting air velocity in [m/s]
tskObs	a numeric value presenting actual mean skin temperature in [degree C]
taObs	a numeric value presenting air temperaturein [degree C]
met	a numeric value presenting metabolic rate (activity related) in [met]
rh	a numeric value presenting realtive humidity in [%]
deltaT	a numeric value presenting the resolution of the matrix to be used
fBasMet	a string presenting the method of calculating basal metbolic rate. Needs to be one of "rosa", "harris", "miflin", or "fixed". Fixed will result in the value of 58.2 W/m2.
fSA	a string presenting the method of calculating the surface area. Needs to be one of "duBois" or "mosteller".
percCov	a numeric value between 0 and 1 presenting the percentage of the body covered by clothes in [%]
TcMin	a numeric value presenting the minimum allowed core temperature in [degree C].
TcMax	a numeric value presenting the maximum allowed core temperature in [degree C].
plotZone	a boolean variable TRUE or FALSE stating, wether TNZ should be plotted or not.

Details

The percentage of the body covered by clothes can be estimated e.g. based on ISO 9920 Appendix H (Figure H.1). A typical winter case leads to a value of around .86, in the summer case this goes down to values around .68.

Value

calcdTNZ returns a dataframe with the columns dTNZ, dTNZTs, dTNZTa. Thereby
dTNZ The absolute distance to the centroid of the thermoneutral zone
dTNZTs Relative value of distance assuming skin temperature to be dominant for sensation
dTNZTa Relative value of distance assuming ambient temperature to be dominant for sensation

Note

This function was used in earlier versions of TNZ calculation (see references above). The newest version is calcTNZPDF.In case one of the variables is not given, a standard value will be taken from a list (see createCond for details.

Author(s)

Marcel Schweiker and Boris Kingma

References

Kingma, Schweiker, Wagner & van Marken Lichtenbelt Exploring the potential of a biophysical model to understand thermal sensation Proceedings of 9th Windsor Conference: Making Comfort Relevant Cumberland Lodge, Windsor, UK, 2016. Kingma & van Marken Lichtenbelt (2015) <doi:10.1038/nclimate2741> Kingma, Frijns, Schellen & van Marken Lichtenbelt (2014) <doi:10.4161/temp.29702>

See Also

see also calcTNZPDF and calcComfInd

Examples

## Calculate all values
calcdTNZ(171, 71, 45, 1, .6, .12, 37.8, 25.3, 1.1, 50) 

comf documentation built on May 29, 2024, 8:02 a.m.