Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F16%3APU118848" target="_blank" >RIV/00216305:26210/16:PU118848 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.journals.elsevier.com/experimental-thermal-and-fluid-science" target="_blank" >http://www.journals.elsevier.com/experimental-thermal-and-fluid-science</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.expthermflusci.2016.04.015" target="_blank" >10.1016/j.expthermflusci.2016.04.015</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation

Popis výsledku v původním jazyce

A lot of research has been done in order to investigate heat transfer coefficients of human body in various postures, wind speeds and wind directions (e.g., [1-15]). However, there has not been any reference to measurement reproducibility and measurement confidence intervals. The purpose of this study was to determine heat transfer coefficients of a thermal manikin experimentally, while focusing on the repeated determination of the coefficients and statistic data evaluation. The manikin imitates human metabolic heat production; it measures a combined dry heat flux from its surface and also its surface temperature. The major part of the radiative heat flux was eliminated by low-emissivity coating applied to the surface of the nude manikin. The tests were performed across 34 zones that correspond to parts of a human body. Both standing and seated postures were investigated. The tests were conducted at constant air temperature (24°C) and constant wind speed (0.05 m.s-1) environment. Based on three repetitions of each case, the average values of heat transfer coefficients with their confidence intervals were calculated. Next, the results of this paper were compared to the results of similar experimental work of de Dear (de Dear et al. 1997) and Quintela (Quintela et al. 2004). A mismatch of the values is up to 1 W.m-2.K-1, while an extreme was found on the manikin’s seat with a difference of over 1 W.m-2.K-1. The outcomes of this study provide essential information on how to create detailed computational models of thermal environment with regards to thermal comfort where separate values of convective and radiative heat transfer coefficients are required.

Název v anglickém jazyce

Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation

Popis výsledku anglicky

A lot of research has been done in order to investigate heat transfer coefficients of human body in various postures, wind speeds and wind directions (e.g., [1-15]). However, there has not been any reference to measurement reproducibility and measurement confidence intervals. The purpose of this study was to determine heat transfer coefficients of a thermal manikin experimentally, while focusing on the repeated determination of the coefficients and statistic data evaluation. The manikin imitates human metabolic heat production; it measures a combined dry heat flux from its surface and also its surface temperature. The major part of the radiative heat flux was eliminated by low-emissivity coating applied to the surface of the nude manikin. The tests were performed across 34 zones that correspond to parts of a human body. Both standing and seated postures were investigated. The tests were conducted at constant air temperature (24°C) and constant wind speed (0.05 m.s-1) environment. Based on three repetitions of each case, the average values of heat transfer coefficients with their confidence intervals were calculated. Next, the results of this paper were compared to the results of similar experimental work of de Dear (de Dear et al. 1997) and Quintela (Quintela et al. 2004). A mismatch of the values is up to 1 W.m-2.K-1, while an extreme was found on the manikin’s seat with a difference of over 1 W.m-2.K-1. The outcomes of this study provide essential information on how to create detailed computational models of thermal environment with regards to thermal comfort where separate values of convective and radiative heat transfer coefficients are required.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/LO1202" target="_blank" >LO1202: NETME CENTRE PLUS</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

EXPERIMENTAL THERMAL AND FLUID SCIENCE

ISSN

0894-1777

e-ISSN

1879-2286

Svazek periodika

77

Číslo periodika v rámci svazku

2016

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

257-264

Kód UT WoS článku

000377829000023

EID výsledku v databázi Scopus

2-s2.0-84977629589