The Experts below are selected from a list of 179385 Experts worldwide ranked by ideXlab platform
Nyuk Hien Wong - One of the best experts on this subject based on the ideXlab platform.
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Thermal Environment assessment around bodies of water in urban canyons: A scale model study
Sustainable Cities and Society, 2017Co-Authors: Nedyomukti Imam Syafii, Masayuki Ichinose, Eiko Kumakura, Steve Kardinal Jusuf, Kohei Chigusa, Nyuk Hien WongAbstract:Abstract Bodies of water in urban areas are regarded as potential tools for urban Thermal Environment amelioration, but research interest and planning recommendations remain limited. In this experimental study, by using an outdoor scale model, the influence of various configurations of bodies of water (in the form of artificial ponds) on the urban Thermal Environment was assessed, with particular emphasis on pedestrian comfort. The results of the first experiment conducted in this study indicate that the Thermal Environment inside an urban canyon with a pond is better than that without a pond, particularly during the day. Lower air temperatures were also recorded downwind from the pond. However, this effect is accompanied by an increase in the absolute humidity, which may negatively influence pedestrian comfort. Thus, effective pond design is necessary. The results of the second experiment show that ponds in different configurations have different effects on the surrounding Thermal Environment. Generally, configurations with a larger surface area showed a greater cooling effect, and the mean radiant temperature and physiological equivalent temperature were found to be optimized with ponds oriented parallel to the prevailing winds.
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coupled simulations for naturally ventilated rooms between building simulation bs and computational fluid dynamics cfd for better prediction of indoor Thermal Environment
Building and Environment, 2009Co-Authors: Liping Wang, Nyuk Hien WongAbstract:The coupling strategies for natural ventilation between building simulation (BS) and computational fluid dynamics (CFD) are discussed and coupling methodology for natural ventilation is highlighted. Two single-zone cases have been used to validate coupled simulations with full CFD simulations. The main discrepancy factors have also been analyzed. The comparison results suggest that for coupled simulations taking pressure from BS as inlet boundary conditions can provide more accurate results for indoor CFD simulation than taking velocity from BS as boundary conditions. The validation results indicate that coupled simulations can improve indoor Thermal Environment prediction for natural ventilation taking wind as the major force. With the aids of developed coupling program, coupled simulations between BS and CFD can effectively improve the speed and accuracy in predicting indoor Thermal Environment for natural ventilation studies.
Shinsuke Kato - One of the best experts on this subject based on the ideXlab platform.
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simulation analysis of site design and layout planning to mitigate Thermal Environment of riverside residential development
Building Simulation, 2010Co-Authors: Chunming Hsieh, Hong Chen, Ryozo Ooka, Shinsuke Kato, Jaeock Yoon, Kiyoshi MiishoAbstract:The present study explains the application of a numerical simulation to investigate the Thermal Environment of a new riverside residential development in summer. The case study area consists of more than one hundred two-story detached houses built next to a river near Tokyo, Japan. According to the meteorological data, prevailing wind directions are at an angle to the northbound river flow affecting the microclimate of the study area in terms of surface temperature of land and buildings, air temperature and wind distribution at pedestrian height. These factors have been estimated using the stepwise CFD (computational fluid dynamics) simulation of radiation, conduction and convection. This method leads to an improvement of outdoor Thermal Environment by manipulating the site design and layout planning scenarios. The effect of river, permeable pavements and green space on Thermal Environment is examined by the site design options. Likewise, the impact of building arrangement is evaluated using alternative layout planning scenarios. In total, five scenarios have been simulated for the proposed sustainable development as explained in the paper. Above simulations provided an insight into the mitigation effects of each countermeasure. It is also shown that the management of inflow paths and the creation of wind paths for the interior of the site have the potentials to improve the outdoor Thermal Environment of riverside residential development.
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urban Thermal Environment measurements and numerical simulation for an actual complex urban area covering a large district heating and cooling system in summer
Atmospheric Environment, 2005Co-Authors: Hong Huang, Ryozo Ooka, Shinsuke KatoAbstract:Abstract Urban Thermal situation is thought to have a great influence on the air quality in urban areas. In recent years, the urban Thermal Environment has become worse, such as the days on which the temperature goes above 30 °C, the sultry nights and heat stroke increase due to changes in terrestrial cover and increased anthropogenic heat emission accompanied by urbanization. Therefore, the urban Thermal Environment should be carefully investigated and accurately analyzed for a better study of the air quality. Here, in order to study the urban Thermal Environment in summer, (1) the actual status of an urban Thermal Environment in a complex urban area covering a large district heating and cooling (DHC) system in Tokyo is investigated using field measurements, and (2) a numerical simulation program which can be adapted to complex urban areas coupled with convection, radiation and conduction is developed and used to predict the urban Thermal Environment. Wind velocity, temperature and humidity are obtained from the simulation, which shows good agreement with results of the field measurement. The spatial distribution of the standard effective temperature (SET*), the comprehensive index of human Thermal comfort, is also calculated using the above results, to estimate the Thermal comfort at the pedestrian level. This urban Thermal numerical simulation can be coupled with air pollution dispersion and chemical processes to provide a more precise air quality prediction in complex urban areas.
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study on outdoor Thermal Environment of apartment block in shenzhen china with coupled simulation of convection radiation and conduction
Energy and Buildings, 2004Co-Authors: Hong Chen, Ryozo Ooka, Kazuya Harayama, Shinsuke Kato, Xiaofeng LiAbstract:Abstract Shenzhen City in China is developing rapidly now. Correspondingly, deterioration of the outdoor Environment in phenomena such as heat island has become a serious problem. This aggravation of the Thermal Environment has spoiled urban sustainability. In this paper, (1) in order to predict the outdoors Thermal Environment in summer in an apartment block, unsteady coupled simulation of convection, radiation, and conduction is developed and used. The velocity, temperature, humidity, and MRT in the urban area are obtained from the simulation. In order to estimate the pedestrian level of Thermal comfort in the outdoor Thermal Environment, the spatial distributions of New Standard Effective Temperature (SET ∗ ) is calculated using the above results. (2) The actual situation of the outdoors Thermal Environment in summer in an apartment block in Shenzhen City is investigated by field measurements. (3) The effect of schemes to improve the outdoor Thermal Environment in this apartment block, such as changing building shapes, planting arrangements, etc. are examined using this prediction method.
Ryozo Ooka - One of the best experts on this subject based on the ideXlab platform.
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simulation analysis of site design and layout planning to mitigate Thermal Environment of riverside residential development
Building Simulation, 2010Co-Authors: Chunming Hsieh, Hong Chen, Ryozo Ooka, Shinsuke Kato, Jaeock Yoon, Kiyoshi MiishoAbstract:The present study explains the application of a numerical simulation to investigate the Thermal Environment of a new riverside residential development in summer. The case study area consists of more than one hundred two-story detached houses built next to a river near Tokyo, Japan. According to the meteorological data, prevailing wind directions are at an angle to the northbound river flow affecting the microclimate of the study area in terms of surface temperature of land and buildings, air temperature and wind distribution at pedestrian height. These factors have been estimated using the stepwise CFD (computational fluid dynamics) simulation of radiation, conduction and convection. This method leads to an improvement of outdoor Thermal Environment by manipulating the site design and layout planning scenarios. The effect of river, permeable pavements and green space on Thermal Environment is examined by the site design options. Likewise, the impact of building arrangement is evaluated using alternative layout planning scenarios. In total, five scenarios have been simulated for the proposed sustainable development as explained in the paper. Above simulations provided an insight into the mitigation effects of each countermeasure. It is also shown that the management of inflow paths and the creation of wind paths for the interior of the site have the potentials to improve the outdoor Thermal Environment of riverside residential development.
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study on mitigation measures for outdoor Thermal Environment on present urban blocks in tokyo using coupled simulation
Building and Environment, 2009Co-Authors: Hong Chen, Ryozo Ooka, Hong Huang, Takashi TsuchiyaAbstract:Abstract The heat island phenomenon and degradation of the urban Thermal Environmental have become serious problems in Japan. In order to improve the outdoor Thermal Environment, it is necessary to understand quantitatively the effects of various measures. In this paper, the authors have performed coupled simulations of convection, radiation and conduction to evaluate the outdoor Thermal Environment over different urban blocks – Ōtemachi as representative of a high-rise area and Kyobashi as a mid-rise area in Tokyo, Japan – to compare the effects of measures such as the heat release point and means of air-conditioning, greening, high surface albedo, and traffic volume. The results showed that the effectiveness of moderation countermeasures differed according to the configuration of the urban blocks.
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urban Thermal Environment measurements and numerical simulation for an actual complex urban area covering a large district heating and cooling system in summer
Atmospheric Environment, 2005Co-Authors: Hong Huang, Ryozo Ooka, Shinsuke KatoAbstract:Abstract Urban Thermal situation is thought to have a great influence on the air quality in urban areas. In recent years, the urban Thermal Environment has become worse, such as the days on which the temperature goes above 30 °C, the sultry nights and heat stroke increase due to changes in terrestrial cover and increased anthropogenic heat emission accompanied by urbanization. Therefore, the urban Thermal Environment should be carefully investigated and accurately analyzed for a better study of the air quality. Here, in order to study the urban Thermal Environment in summer, (1) the actual status of an urban Thermal Environment in a complex urban area covering a large district heating and cooling (DHC) system in Tokyo is investigated using field measurements, and (2) a numerical simulation program which can be adapted to complex urban areas coupled with convection, radiation and conduction is developed and used to predict the urban Thermal Environment. Wind velocity, temperature and humidity are obtained from the simulation, which shows good agreement with results of the field measurement. The spatial distribution of the standard effective temperature (SET*), the comprehensive index of human Thermal comfort, is also calculated using the above results, to estimate the Thermal comfort at the pedestrian level. This urban Thermal numerical simulation can be coupled with air pollution dispersion and chemical processes to provide a more precise air quality prediction in complex urban areas.
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study on outdoor Thermal Environment of apartment block in shenzhen china with coupled simulation of convection radiation and conduction
Energy and Buildings, 2004Co-Authors: Hong Chen, Ryozo Ooka, Kazuya Harayama, Shinsuke Kato, Xiaofeng LiAbstract:Abstract Shenzhen City in China is developing rapidly now. Correspondingly, deterioration of the outdoor Environment in phenomena such as heat island has become a serious problem. This aggravation of the Thermal Environment has spoiled urban sustainability. In this paper, (1) in order to predict the outdoors Thermal Environment in summer in an apartment block, unsteady coupled simulation of convection, radiation, and conduction is developed and used. The velocity, temperature, humidity, and MRT in the urban area are obtained from the simulation. In order to estimate the pedestrian level of Thermal comfort in the outdoor Thermal Environment, the spatial distributions of New Standard Effective Temperature (SET ∗ ) is calculated using the above results. (2) The actual situation of the outdoors Thermal Environment in summer in an apartment block in Shenzhen City is investigated by field measurements. (3) The effect of schemes to improve the outdoor Thermal Environment in this apartment block, such as changing building shapes, planting arrangements, etc. are examined using this prediction method.
Hong Chen - One of the best experts on this subject based on the ideXlab platform.
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simulation analysis of site design and layout planning to mitigate Thermal Environment of riverside residential development
Building Simulation, 2010Co-Authors: Chunming Hsieh, Hong Chen, Ryozo Ooka, Shinsuke Kato, Jaeock Yoon, Kiyoshi MiishoAbstract:The present study explains the application of a numerical simulation to investigate the Thermal Environment of a new riverside residential development in summer. The case study area consists of more than one hundred two-story detached houses built next to a river near Tokyo, Japan. According to the meteorological data, prevailing wind directions are at an angle to the northbound river flow affecting the microclimate of the study area in terms of surface temperature of land and buildings, air temperature and wind distribution at pedestrian height. These factors have been estimated using the stepwise CFD (computational fluid dynamics) simulation of radiation, conduction and convection. This method leads to an improvement of outdoor Thermal Environment by manipulating the site design and layout planning scenarios. The effect of river, permeable pavements and green space on Thermal Environment is examined by the site design options. Likewise, the impact of building arrangement is evaluated using alternative layout planning scenarios. In total, five scenarios have been simulated for the proposed sustainable development as explained in the paper. Above simulations provided an insight into the mitigation effects of each countermeasure. It is also shown that the management of inflow paths and the creation of wind paths for the interior of the site have the potentials to improve the outdoor Thermal Environment of riverside residential development.
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study on mitigation measures for outdoor Thermal Environment on present urban blocks in tokyo using coupled simulation
Building and Environment, 2009Co-Authors: Hong Chen, Ryozo Ooka, Hong Huang, Takashi TsuchiyaAbstract:Abstract The heat island phenomenon and degradation of the urban Thermal Environmental have become serious problems in Japan. In order to improve the outdoor Thermal Environment, it is necessary to understand quantitatively the effects of various measures. In this paper, the authors have performed coupled simulations of convection, radiation and conduction to evaluate the outdoor Thermal Environment over different urban blocks – Ōtemachi as representative of a high-rise area and Kyobashi as a mid-rise area in Tokyo, Japan – to compare the effects of measures such as the heat release point and means of air-conditioning, greening, high surface albedo, and traffic volume. The results showed that the effectiveness of moderation countermeasures differed according to the configuration of the urban blocks.
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study on outdoor Thermal Environment of apartment block in shenzhen china with coupled simulation of convection radiation and conduction
Energy and Buildings, 2004Co-Authors: Hong Chen, Ryozo Ooka, Kazuya Harayama, Shinsuke Kato, Xiaofeng LiAbstract:Abstract Shenzhen City in China is developing rapidly now. Correspondingly, deterioration of the outdoor Environment in phenomena such as heat island has become a serious problem. This aggravation of the Thermal Environment has spoiled urban sustainability. In this paper, (1) in order to predict the outdoors Thermal Environment in summer in an apartment block, unsteady coupled simulation of convection, radiation, and conduction is developed and used. The velocity, temperature, humidity, and MRT in the urban area are obtained from the simulation. In order to estimate the pedestrian level of Thermal comfort in the outdoor Thermal Environment, the spatial distributions of New Standard Effective Temperature (SET ∗ ) is calculated using the above results. (2) The actual situation of the outdoors Thermal Environment in summer in an apartment block in Shenzhen City is investigated by field measurements. (3) The effect of schemes to improve the outdoor Thermal Environment in this apartment block, such as changing building shapes, planting arrangements, etc. are examined using this prediction method.
Yi Jiang - One of the best experts on this subject based on the ideXlab platform.
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research on a dynamic simulation method of atrium Thermal Environment based on neural network
Building and Environment, 2012Co-Authors: Rong Qin, Da Yan, Xin Zhou, Yi JiangAbstract:As a widely used interior building space, atriums usually have a large volume and a large-scale glass curtain wall which make designing and organizing the indoor Thermal Environment much more complex than a normal building space. Methods of traditional air conditioning design can hardly meet all the requirements. The goal of this research is to find a new simulation method based on an artificial neural network. The artificial neural network is used to describe the annual dynamic process with detailed parameter data and a reasonable amount of calculation time. Computational Fluid Dynamics (CFD) enables the prediction of indoor Thermal data for buildings, and energy simulation model provides a whole building energy analysis, the artificial neural network (ANN) is used as an integrating tool to couple the energy simulation model and CFD model. The ANN model is iterative with the energy simulation model (DeST software), and can reasonably predict reasonable dynamic energy consumption and Thermal Environment parameters.
