calcHbExSteady: Calculates Human Body Exergy Consumption Rate Using Steady...

Description Usage Arguments Value Note Author(s) References See Also Examples

View source: R/fctHBxStSt.r

Description

calcHbExSteady calculates the human body exergy consumption rate in W/m2 using steady state method based on a set of environmental variables.

Usage

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calcHbExSteady(ta, tr, rh, vel, clo, met, tao, rho, frad = 0.7, eps = 0.95, ic = 1.085, 
ht = 171, wt = 70, tcr = 37, tsk = 36, basMet = 58.2, warmUp = 60, cdil = 100, 
sigmatr = 0.25)

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]

tao

a numeric value presenting outdoor air temperature in [degree C]

rho

a numeric value presenting outdoor relative humidity [%]

frad

a numeric value presenting the fraction of body exposed to radiation 0.7(for seating), 0.73(for standing) [-]

eps

a numeric value presenting emissivity [-]

ic

a numeric value presenting permeability of clothing: 1.084 (average permeability), 0.4 (low permeability)

ht

a numeric value presenting body height in [cm]

wt

a numeric value presenting body weight in [kg]

tcr

a numeric value presenting initial value for core temperature in [degree C]

tsk

a numeric value presenting initial value for skin temperature in [degree C]

basMet

a numeric value presenting basal metabolic rate in [met]

warmUp

a numeric value presenting length of warm up period, i.e. number of times, loop is running for HBx calculation

cdil

a numeric value presenting value for cdil in 2-node model of Gagge

sigmatr

a numeric value presenting value for cdil in 2-node model of Gagge

Value

Returns a data.frame with the following columns

Exergy input

xInmets

Exergy input through metabolism

xInmetwcs

Label warm/ cold for exergy input through metabolism

xInAIRwcs

Exergy input through inhaled humid air

xInAIRwcwcs

Label warm/ cold for exergy input through inhaled humid air

xInAIRwds

Exergy input through inhaled dry air

xInAIRwdwds

Label wet/ dry for exergy input through inhaled dry air

xInLUNGwcs

Exergy input through water lung

xInLUNGwcwcs

Label warm/ cold for exergy input through water lung

xInLUNGwds

Exergy input through water lung

xInLUNGwdwds

Label wet/ dry for exergy input through water lung

xInsheLLwcs

Exergy input through water from sweat

xInsheLLwcwcs

Label warm/ cold for exergy input through water from sweat

xInsheLLwds

Exergy input through water from sweat

xInsheLLwdwds

Label wet/ dry for exergy input through water from sweat

xInraDs

Exergy input through radiation

xInraDwcs

Label warm/ cold for exergy input through radiation

xIntotaLs

total exergy input

Exergy output

xoutstorecores

Exergy stored in core

xoutstoreshels

Exergy stored in shell

xoutaIRwcs

Exergy output through exhaled humid air

xoutaIRwcwcs

Label warm/ cold for exergy output through exhaled humid air

xoutaIRwds

Exergy output through exhaled dry air

xoutaIRwdwds

Label wet/ dry for exergy output through exhaled dry air

xoutswEATwcs

Exergy output through water vapour from sweat

xoutswEATwcwcs

Label warm/ cold for exergy output through water vapour from sweat

xoutswEATwds

Exergy output through water vapour from sweat

xoutswEATwdwds

Label wet/ dry for exergy output through water vapour from sweat

xoutraDs

Exergy output through radiation

xoutraDwcs

Label warm/ cold for exergy output through radiation

xoutCONVs

Exergy output through convection

xoutCONVwcs

Label warm/ cold for exergy output through convection

xouttotaLs

total exergy output

Exergy balance

xconss

total exergy consumption

xConsumption

total exergy consumption

Additional values

tsks

Calculated skin temperature

tcrs

Calculated core temperature

ws

Calculated skin wettedness

Note

According to Gagge's paper (1973), the value of 'cdil' may vary between 75 and 225 and 'sigma-tr' between 0.25 and 0.75. There is a note in the appendix of his paper saying two things: 1) whatever the values taken for cdil and sigma-tr, there must be no significant change in resulting thermal equilibrium. But, the values taken for cdil and sigmaTr do affect time to equilibrium. According to the analysis of schweiker et al. (2015), the values of 100 and .25 lead to the best fit of calculated and observed skin temperature.

Author(s)

This function is based on a VBA code developed by Masanori Shukuya. transformation of VBA-code and Excel procedures into R syntax by Marcel Schweiker.

References

Schweiker, M., Kolarik, J., Dovjak, M. and Shukuya, M. Unsteady-state human-body exergy consumption rate and its relation to subjective assessment of dynamic thermal environments, Energy and Buildings , 2016, 116, 164 - 180

Shukuya, M. Calculation of human body-core and skin-layer temperatures under unsteady-state conditions-for unsteady-state human-body exergy analysis-, internal report of exergy-research group, Tech. rep., KIT/TCU, 2015.

See Also

see also calcComfInd, calcHbExUnsteady

Examples

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## Calculation of human body exergy consumption rate
calcHbExSteady(22, 24, 50, .1, .8, 1.2, 5, 80)

## Calculation of multiple values
dfData <- data.frame(ta=c(20:25), tr=c(20:25))
dfResult <- calcHbExSteady(22, 24, 50, .1, .8, 1.2, 5, 80) 
for(i in 1:nrow(dfData)){
dfResult[i,] <- calcHbExSteady(dfData$ta[i], dfData$tr[i], 50, .1, .5, 1.1, 5, 80)
}

marcelschweiker/comf documentation built on May 21, 2017, 6:41 p.m.