Simulation of Radiation Heat Flux Effect in Buildings on Human Thermal Comfort Under Transient Conditions

Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 6)

Abstract

The purpose of this study is to investigate the effect of radiation heat flux from lighting lamps in buildings on human thermal comfort. In order to obtain the thermal responses of human body exposed to radiation heat flux from lighting lamps, a mathematical model based on Gagge model with some modifications were developed and the effect of radiation heat flux from lighting lamps on human thermal comfort was examined under transient conditions. The human body was divided into 16 sedentary segments and the variation of sensible, latent heat losses, and skin wettedness were calculated under radiation effect in buildings.

Keywords

Radiation Thermal comfort Heat loss Skin wittedness 

Nomenclature

A

Surface area, m2

AD

DuBois surface area, m2

C

Convective heat transfer, W/m2

Cres

Sensible heat loss due to respiration, W/m2

cp,b

Constant pressure specific heat of body tissue, kJ/kgK

cp,bl

Constant pressure specific heat of blood, kJ/kgK

[CSIG]cr

Cold signal from the core, dimensionless

[CSIG]sk

Cold signal from the skin, dimensionless

(C+R)t

Total sensible heat transfer, W/m2

Emax

Maximum possible evaporative heat loss, W/m2

Eres

Evaporative heat loss due to respiration, W/m2

Ersw

Evaporative heat loss due to regulatory sweating, W/m2

Esk

Total evaporative heat loss from skin, W/m2

hc

Convection heat transfer coefficient, W/m2K

hfg

Heat of vaporization of water, kJ/kg

hr

Radiation heat transfer coefficient, W/m2K

i

Body segment number, dimensionless

j

Air or fabric layers number, dimensionless

k

Thermal conductivity of the air, mm W/m2 ℃

K

Effective conductance between core and skin, W/m2 K

l

Body height, m

LR

Lewis ratio, ℃/kPa

M

Total rate of body heat production, W/m2

Mmet

Metabolic heat production W/m2

Mshiv

Shivering heat production W/m2

m

Body mass, kg

mbl

Blood circulation between core and skin, kg/m2 s

mrsw

Rate of regulatory sweat generation, kg/m2 s

nl

Number of layers covering segment, dimensionless

Pa

Water vapor pressure in ambient air, kPa

Psk,s

Water vapor pressure saturated at skin temperature, kPa

Qcr,sk

Heat flow from core to skin, W/m2

Qr,sk

Radiation heat flux from lighting lamps to skin, W/m2

R

Radiative heat transfer, W/m2

r

Radius, m

Ra

Thermal resistance of outer air layer, m2 ℃/W

Ral

Thermal resistance of air layer, m2 ℃/W

Re,a

Evaporative resistance of outer air layer, m2 kPa/W

Re,al

Evaporative resistance of air layer, m2 kPa/W

Re,f

Evaporative resistance of fabrics, m2 kPa/W

Re,t

Total evaporative resistance, m2 kPa/W

Rf

Thermal resistance of fabrics, m2 ℃/W

Rt

Total thermal resistance, m2 ℃/W

Scr

Heat storage in core compartment, W/m2

Ssk

Heat storage in skin compartment, W/m2

X

Air layer thickness, mm

ta

Ambient air temperature, ℃

tb,m

Average of the body temperature, ℃

tcr

Core temperature, ℃

tcr,m

Mean core temperature, ℃

to

Operative temperature, ℃

tr

Mean radiant temperature, ℃

tsk

Skin temperature, ℃

tsk,m

Mean skin temperature, ℃

w

Skin wettedness, dimensionless

W

External work accomplished, W/m2

wrsw

Required to evaporate regulatory sweat, dimensionless

[WSIG]b

Warm signal from the body, dimensionless

[WSIG]cr

Warm signal from the core, dimensionless

[WSIG]sk

Warm signal from the skin, dimensionless

α

Fraction of total body mass concentrated in skin compartment, dimensionless

θ

Time, s

Notes

Acknowledgements

The authors wish to thank the Scientific and Technological Research Council of Turkey (TUBITAK) for supporting this research under the project number 213M661.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Faculty of Engineering, Mechanical Engineering DepartmentUludag UniversityBursaTurkey

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