comf (version 0.1.10)

calcDisc: Predicted Discomfort based on the 2-Node-Model

Description

calcDisc calculates Predicted Discomfort based on the 2-Node-Model by Gagge et al.

Usage

calcDisc(ta, tr, vel, rh, clo = 0.5, met = 1, wme = 0, pb = 760, ltime = 60, 
ht = 171, wt = 70, tu = 40, obj = "set", csw = 170, cdil = 120, cstr = 0.5)

Arguments

ta

a numeric value presenting air temperature in [degree C]

tr

a numeric value presenting mean radiant temperature in [degree C]

vel

a numeric value presenting air velocity in [m/s]

rh

a numeric value presenting relative humidity [%]

clo

a numeric value presenting clothing insulation level in [clo]

met

a numeric value presenting metabolic rate in [met]

wme

a numeric value presenting external work in [met]

pb

a numeric value presenting barometric pressure in [torr] or [mmHg]

ltime

a numeric value presenting exposure time in [minutes]

ht

a numeric value presenting body height in [cm]

wt

a numeric value presenting body weight in [kg]

tu

a numeric value presenting turbulence intensity in [%]

obj

a character element, either "set" or "pmvadj"

csw

a numeric value presenting the driving coefficient for regulatory sweating

cdil

a numeric value presenting the driving coefficient for vasodilation

cstr

a numeric value presenting the driving coefficient for vasoconstriction

Value

calcDisc returns the Predicted Discomfort

Details

All variables must have the same length 1. For the calculation of several values use function calcComfInd. The value of obj defines whether the function will use the version presented in ASHRAE 55-2013 for adjustment of pmv (obj = "pmvadj"), or the original code by Gagge to calculate set (obj = "set"). In the version presented in ASHRAE 55-2013, the lines of code related to self-generated convection is deleted. Therefore, a difference can only be seen at higher values of met.

References

ASHRAE Standard 55-2013. Thermal environmental conditions for human occupancy. American society of heating, Refrigerating and Air-Conditioning Engineering, Atlanta, USA, 2013.

Fountain & Huizenga (1995) A thermal sensation model for use by the engineering profession ASHRAE RP-781 Final report.

Gagge, Fobelets & Berglund (1986) A standard predictive index of human response to the thermal environment, ASHRAE transactions, 92 (2B), 709-731.

See Also

see also calcComfInd

Examples

# NOT RUN {
## Using several rows of data:
ta <- c(20,22,24)
tr <- ta
vel <- rep(.15,3)
rh <- rep(50,3)

maxLength <- max(sapply(list(ta, tr, vel, rh), length))
Disc <- sapply(seq(maxLength), function(x) { calcDisc(ta[x], tr[x], vel[x], rh[x]) } ) 
# }