alexa Convective Heat Transfer Coefficients of the Human Body
ISSN-2165-7556

Journal of Ergonomics
Open Access

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Research Article

Convective Heat Transfer Coefficients of the Human Body under Forced Convection from Ceiling

Yoshihito Kurazumi1*, Lauris Rezgals2 and Arsen Krikor Melikov3

1School of Life Studies, Sugiyama Jogakuen University, Japan

2Faculty of Civil Engineering, Riga technical University 1 Kalku Street, Riga, LV 1658, Latvia

3International Centre for Indoor Environment and Energy, Technical University of Denmark Nils Koppels Allé, Building 402, 2800 Kongens Lyngby, Denmark

*Corresponding Author:
Yoshihito Kurazumi
17-3 Hoshigaoka-motomachi, Chikusa-ku
Nagoya, Aichi 464-8662, Japan
Tel: +81-52-781-4913
Fax: +81-52-782-7265
E-mail: [email protected]

Received date: February 19, 2014; Accepted date: April 07, 2014; Published date: April 15, 2014

Citation: Kurazumi Y, Rezgals L, Melikov AK (2014) Convective Heat Transfer Coefficients of the Human Body under Forced Convection from Ceiling. J Ergonomics 4:126. doi: 10.4172/2165-7556.1000126

Copyright: © 2014 Kurazumi Y, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

The average convective heat transfer coefficient for a seated human body exposed to downward flow from above was determined. Thermal manikin with complex body shape and size of an average Scandinavian female was used. The surface temperature distribution of the manikin’s body was as the skin temperature distribution of an average person. The measurements were performed in a room with controlled thermal environment. Air temperature was set at 26ºC for cooling and at 20ºC for heating. The radiant temperature asymmetry in horizontal and vertical direction was close to zero, i.e. mean radiant temperature was equal to the air temperature. The air velocity of the isothermal downward flow from the ceiling at height of 1.5 m above the floor (above the top of the head) was set in a range between still air and 0.73 m/s. Based on the analyses of the results relationships for determination of the convective heat transfer coefficient of the whole body (hc [W/(m2•K)]) was proposed: hc=4.088+6.592V1.715 for a seated naked body at 20ºC and hc=2.874+7.427V1.345 for a seated naked body at 26ºC. Differences in the convective heat transfer coefficient of the whole body in low air velocity range, V<0.3 m/s, due to the natural convection were found. The results may be useful during design of air distribution in rooms, e.g. low impulse ventilation, diffuse ventilation, etc.

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