Author: Wang, Guang
Title: Effect of outdoor pedestrian level turbulence on the convective heat transfer coefficient of human body
Degree: M.Eng.
Year: 2022
Subject: Heat -- Convection
Atmospheric turbulence
Hong Kong Polytechnic University -- Dissertations
Department: Department of Building Environment and Energy Engineering
Pages: vii, 87 pages : color illustrations
Language: English
Abstract: In recent years, a lot of research has been done to improve the thermal climate of indoor living spaces, and machines such as air conditioners that can modify the thermal environment of indoor living areas have also been developed to aid in this effort. However, as the pace of urbanization continues to rise, the urban heat island effect increasingly manifests itself, and the temperature outside continues to rise year after year, causing people to pay growing interest to their outdoor thermal comfort and safety. The convective heat transfer coefficient is a good representation of the heat dissipation process that takes place between the human body and the outside world, it is frequently employed as the foundational parameter for evaluating outdoor thermal comfort. In contrast, there are few research on convective heat transfer coefficients in outdoor wind environments in the literature. Unlike real-world wind environments, most of this research is based on artificial environments (wind tunnels) or simulation computations, which cannot accurately reflect the variation in convective heat transfer coefficients caused by wind in an outdoor environment. Furthermore, turbulence is an important characteristic quantity of outdoor wind, and there has been little investigation into the range of tolerable values for this quantity. Because of this, the primary goal of this research is to determine the relationship between turbulence intensity, wind speed, and convective heat transfer coefficient in the conditions of outdoor wind pedestrian levels. Using a thermal manikin instead of a real human, data on skin temperature was collected during a field experiment done on campus, and the preliminary mathematical expressions on the relationship between heat transfer coefficient and turbulence intensity, and wind speed are proposed. When the wind speed is not at a high level, it is found that the strength of turbulence intensity has a stronger impact on the experimental results, and when the wind speed reaches a high level, the influence of turbulence intensity is found to be weakened. Furthermore, the convective heat transfer coefficients are not as expected from previous experiments, both at low and high turbulent intensities. This is true for both low and high turbulent intensities.
Rights: All rights reserved
Access: restricted access

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