Radiative and convective heat transfer coefficients of the human body in natural convection

Kurazumi, Yoshihito; Tsuchikawa, Tadahiro; Ishii, Jin; Fukagawa, Kenta; Yamato, Yoshiaki; Matsubara, Naoki

doi:10.1016/j.buildenv.2007.12.012

Cited by 118 publications

(58 citation statements)

References 42 publications

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“…From the diagrams in Figure 5, the side openings introduced on the upper floors greatly improved the wind situation on the ground floor where the velocity goes up to 2.1 m/s. An air velocity of approximately 1.8 m/s was also noted at test points (9) and (10) in Figure 3. This indicates that the center of the atrium is well-ventilated.…”

Section: Providing Cross Ventilation In the Circulation Zones Of Typimentioning

confidence: 92%

“…Several studies have shown that users are able to tolerate high thermal temperatures under certain conditions by elevated air velocities [7][8][9][10][11][12][13]. In particular, a study by Fountain and Arens [7] is a comprehensive review that outlines research investigating the impact of moving air on thermal sensation and the comfort limits of air velocity, which is crucial for avoiding drafts.…”

Section: Introductionmentioning

confidence: 99%

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Improving Natural Ventilation Conditions on Semi-Outdoor and Indoor Levels in Warm–Humid Climates

Bayoumi¹

2018

Buildings

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Building form and facade development for energy saving and generation are of great importance. Further development for natural ventilation purposes is also imperative as it is related to many issues that affect the quality of the living and working environment inside and around the buildings in outdoor and semi-outdoor spaces. In rapidly developing regions experiencing a warm and humid climate, like Saudi Arabia, mechanical cooling and ventilation are commonly used in residential and non-residential buildings. However, this was not the case in traditional structures, like the massive coral buildings of Jeddah, where cooling essentially depended on cross ventilation and heat storage in thermal mass. Further, the building forms in the traditional oriental city were optimized for natural ventilation on the macro-and micro-urban and room scales, respectively. Owing to the advancement in air-conditioning technology, conventional building design approaches tend to encourage sealed indoor spaces that rarely interact with the outdoor environment. Even in such harsh climates, during many months in a year, the outdoor temperature is remarkably low, allowing the utilization of natural ventilation within the rooms, as well as between building complexes and the surrounding spaces. This optimization process requires the integrated planning of many aspects, such as the facade, building form, as well as the intermediate threshold spaces between the indoor and outdoor spaces. Non-residential buildings in Saudi Arabia require a large amount of energy for operation. This is mainly due to the relatively high cooling demand caused by internal loads. A hybrid cooling system that incorporates mechanical and natural cooling and ventilation can be implemented for low-temperature days and nights. This paper presents a method for saving energy in a university faculty building, which is located in Jeddah. Models of the proposed solutions were analyzed using a computational fluid dynamics simulation tools, as well as the dynamic building simulation tool IDA-Indoor Climate and Energy (IDA-ICE) to assess user comfort and the level of reduction in energy demand.

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Section: Providing Cross Ventilation In the Circulation Zones Of Typimentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Improving Natural Ventilation Conditions on Semi-Outdoor and Indoor Levels in Warm–Humid Climates

Bayoumi¹

2018

Buildings

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“…The heat transfer coefficient is assumed to be linearly relatied to heat flux and to temperature difference (Najjaran, 2012;Kurazumi et al, 2008).…”

Section: Numerical Simulationmentioning

confidence: 99%

Balancing Comfort and Energy Use for Sustainable Buildings: Thermal Comfort Modeling using a Space-variant Manikin

Ogedengbe

Seidu

Rosen

2018

European Journal of Sustainable Development Research

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To help balance comfort and energy use in residential, institutional and commercial buildings in order to make them more sustainable, a thermal comfort model is coupled with a computational fluid dynamic approach. The developed tool provides an effective tool for demand side management of energy use in buildings. The asymmetrical thermal environment in a university cafeteria building is modeled, and a two dimensional numerical simulation is prepared separately of the thermal sensation in the cafeteria. A finite volume formulation is used to provide the temperature distribution around a space-variant manikin, which is in turn utilized to determine the convective heat transfer coefficients for the simulation of thermal sensation around the manikin.

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“…Laser serves as an energy source, and the energy that entered into the skin tissue is converted to thermal energy by heat transfer coefficient, which increases the temperature in the body and transmits the heat to the surrounding tissue. As the heat is accumulated and increased in body, biological transformation takes place [3][4][5]. The effect of heat when laser is irradiated to a biological tissue has been studied.…”

Section: Introductionmentioning

confidence: 99%

Responses of human sensory characteristics to 532 nm pulse laser stimuli

Kim

et al. 2016

THC

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Abstract.BACKGROUND: Lasers are advantageous in some applications to stimulate a small target area and is used in various fields such as optogenetic, photoimmunological and neurophysiological studies. OBJECTIVE: This study aims to implement a non-contact sense of touch without damaging biological tissues using laser. METHODS: Various laser parameters were utilized in safety range to induce a sense of touch and investigate the human responses. With heat distribution simulation, the amount of changes in the temperature and the tendency in laser parameters of sensory stimulation were analyzed. RESULTS:The results showed the identified tactile responses in safety range with various laser parameters and temperature distribution for the laser stimulus was obtained through the simulation. CONCLUSIONS: This study can be applied to the areas of sensory receptor stimulation, neurophysiology and clinical medicine.

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Radiative and convective heat transfer coefficients of the human body in natural convection

Cited by 118 publications

References 42 publications

Improving Natural Ventilation Conditions on Semi-Outdoor and Indoor Levels in Warm–Humid Climates

Improving Natural Ventilation Conditions on Semi-Outdoor and Indoor Levels in Warm–Humid Climates

Balancing Comfort and Energy Use for Sustainable Buildings: Thermal Comfort Modeling using a Space-variant Manikin

Responses of human sensory characteristics to 532 nm pulse laser stimuli

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