Simulation Analysis on Effect of Shading Types on Outdoor Thermal Environment

2011 ◽  
Vol 374-377 ◽  
pp. 1147-1150
Author(s):  
Sha Lu ◽  
Lei Zhang ◽  
Qing Lin Meng
Keyword(s):  
Solar Radiation ◽  
Time Constant ◽  
Simulation Analysis ◽  
Thermal Environment ◽  
Tree Canopy ◽  
Thermal Time ◽  
Heat Island ◽  
Average Heat ◽  
Coverage Ratio ◽  
Outdoor Thermal Environment

Simulating the summer outdoor thermal environment of Exhibition Center in Taizhou with the improved CTTC (cluster thermal time constant) model to quantitatively analyze the effect of shading types on the heat island intensity. The results show that the effect of tree canopy is the most obvious. When the shading coverage ratio is less than 20%, the variations of average heat island intensity with the increased of solar radiation transmissivity is little, and the cooling effect is not significant.

Study on Building Engineering with Simulation and Analysis of Outdoor Thermal Environment for a Residential Subdistrict in Hot Summer/Cold Winter Region

2013 ◽  
Vol 700 ◽  
pp. 235-238
Author(s):  
Liu Zhang ◽  
Yong Hong Huang ◽  
Lian Yang
Keyword(s):  
Thermal Environment ◽  
Wall Material ◽  
Heat Island ◽  
Cold Winter ◽  
Simulation Data ◽  
High Rise ◽  
The North ◽  
Outdoor Thermal Environment ◽  
Air Circulation ◽  
Building Engineering

Thermal environmental problems in urban high-rise buildings are prevalent. To analyze the phenomenon, the thermal environment of a typical urban residential subdistrict is simulated by using CFD techniques considering the affects of different type of wall material. The simulation data are carefully analyzed. Some useful results are thus obtained. The direction of the buildings affects air circulation greatly with the north-south orientation having the best effects. Temperature in the subdistrict is about 3~5°C higher than its surroundings because of heat island effects which could be weakened if greening rate of the sbudistrict is increased. Finally, simulation results show that wall materials affect the environment considerably.

Numerical Simulation on Cooling Effects of Greening for Alleviating Urban Heat Island Effect in North China

2014 ◽  
Vol 675-677 ◽  
pp. 1227-1233 ◽  
Author(s):  
Cheng Chen ◽  
Yu Yue ◽  
Wen Jiang
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Urban Heat Island ◽  
North China ◽  
Thermal Environment ◽  
Heat Island ◽  
Island Effect ◽  
Outdoor Thermal Environment ◽  
Urban Heat ◽  
Cooling Effects

As the climate warming up, the effects of the urban heat island have been an insurmountable issue in the urban development. In this paper, taking Tianjin for example, the research combined computer simulation with on-site measurement to evaluate the effects of different greening ratios on outdoor thermal environment. Besides, the accuracy of the simulation model has been verified by calibration. Research results determined that the increase of the greening ratio in the existing environment could improve the outdoor thermal environment in summer. But the limitations of green cooling was also pointed out, namely that the air temperature would infinitely close to a certain value with further increasing greening ratio.

Research on the Indoor and Outdoor Wind Environment of University Apartment in the Hot in Summer and Cold in Winter Area

2013 ◽  
Vol 671-674 ◽  
pp. 2240-2244
Author(s):  
Xiang Duan ◽  
Wei Qi Xu ◽  
Ke Xin He
Keyword(s):  
Natural Ventilation ◽  
Simulation Analysis ◽  
Thermal Environment ◽  
High Humidity ◽  
Climatic Region ◽  
Meteorological Element ◽  
Wind Environment ◽  
Outdoor Thermal Environment ◽  
Natural Wind ◽  
Indoor And Outdoor

Wuhan,which is hot in summer and cold in winner climatic region,lies in the east of Jianghan Plain.High temperature and high humidity is characteristics of the city.Thus,it’s vital to strength the natural ventilation of building.Simulation for the situation of wind in Wuhan a certain university in this paper,which take average meteorological element for many years in Wuhan to be initial condition.Selecting Fluent Airpak to conduct flow field Simulation Analysis in the process of calculation.posing problem which exist natural ventilation design universally,according to experimental data,and give tactics to solve it,aiming at utilizing natural wind more effectively and more rationally,and creating comfortable indoor and outdoor thermal environment.

The Effect of Anthropogenic Heat on Local Heat Island Intensity and the Performance of Air Conditioning Systems

2011 ◽  
Vol 250-253 ◽  
pp. 2975-2978 ◽  
Author(s):  
Jing Liu ◽  
Fei Ma ◽  
Ying Li
Keyword(s):  
Air Conditioning ◽  
Thermal Environment ◽  
Local Heat ◽  
Office Building ◽  
Anthropogenic Heat ◽  
Heat Island ◽  
Outdoor Thermal Environment ◽  
Air Conditioning Systems ◽  
Heat Released

Anthropogenic heat released from air conditioning systems is one of the most important factors contributing to the heat island in summer. A model to predicted heat island intensity is built. Using this model, a typical office building cluster is simulated, and the effect of heat released by air condition on outdoor thermal environment and heat island intensity is discussed. Furthermore, the reaction of heat island intensity rising on the performance of air conditioning systems is also investigated.

scholarly journals OUTDOOR THERMAL PERFORMANCE COMPARISON OF SEVERAL GLAZING TYPES

2019 ◽  
Vol 4 (1) ◽  
pp. 22
Author(s):  
Rizki Fitria Madina
Keyword(s):  
Air Temperature ◽  
Thermal Performance ◽  
Thermal Environment ◽  
Performance Comparison ◽  
Heat Island ◽  
Outdoor Air ◽  
Urban Geometry ◽  
Outdoor Thermal Environment ◽  
Study Results ◽  
Urban Heat

<p>ABSTRACT</p><p>Recently, urban air temperature has been increasing, which can be attributed to the vast development, land cover changes, urban geometry, and surface material. Several strategies can be applied to mitigate the urban heat island intensity, one of which is the use of a cool and reflective material to avoid solar heat gain. In this study, we simulate a simplified model of the Asia-Afrika region in Bandung and conduct a comparative analysis to determine the thermal performance of glass in the outdoor thermal environment. The study results demonstrate that the shading coefficient value of glass has a negative correlation with the outdoor air temperature.</p><p>Keywords: glass; shading coefficient; outdoor thermal environment</p>

scholarly journals Effect of the Environmental Stimuli upon the Human Body in Winter Outdoor Thermal Environment

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Yoshihito Kurazumi ◽  
Emi Kondo ◽  
Jin Ishii ◽  
Tomonori Sakoi ◽  
Kenta Fukagawa ◽  
...  
Keyword(s):  
Heat Conduction ◽  
Solar Radiation ◽  
Human Body ◽  
Thermal Environment ◽  
Short Wave ◽  
Psychological Responses ◽  
Long Wave ◽  
Environment Variables ◽  
Outdoor Thermal Environment ◽  
The Relationship

In order to manage the outdoor thermal environment with regard to human health and the environmental impact of waste heat, quantitative evaluations are indispensable. It is necessary to use a thermal environment evaluation index. The purpose of this paper is to clarify the relationship between the psychological thermal responses of the human body and winter outdoor thermal environment variables. Subjective experiments were conducted in the winter outdoor environment. Environmental factors and human psychological responses were measured. The relationship between the psychological thermal responses of the human body and the outdoor thermal environment index ETFe (enhanced conduction-corrected modified effective temperature) in winter was shown. The variables which influence the thermal sensation vote of the human body are air temperature, long-wave thermal radiation and short-wave solar radiation. The variables that influence the thermal comfort vote of the human body are air temperature, humidity, short-wave solar radiation, long-wave thermal radiation, and heat conduction. Short-wave solar radiation, and heat conduction are among the winter outdoor thermal environment variables that affect psychological responses to heat. The use of thermal environment evaluation indices that comprise short-wave solar radiation and heat conduction in winter outdoor spaces is a valid approach.

Evaluating the Impact of Solar Radiation on Outdoor Thermal Comfort by the Development and Validation of a Simple Urban Climatic Model

Solar Energy ◽  
2006 ◽  
Author(s):  
Yuemei Zhu ◽  
Jing Liu ◽  
Yang Yao ◽  
Zuiliang Ma ◽  
Aya Hagishima ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Thermal Comfort ◽  
Air Temperature ◽  
Thermal Environment ◽  
Thermal Conditions ◽  
Outdoor Thermal Comfort ◽  
Outdoor Thermal Environment ◽  
Development And Validation ◽  
The Impact ◽  
Canopy Model

In this paper, in order to predict the outdoor thermal environment, a simple multi-layer canopy model coupled with calculation of outdoor thermal comfort was developed. SET* value was used to estimate the pedestrian level of thermal comfort in the outdoor thermal environment. Preliminary verification of this model using observational data on the outdoor thermal conditions showed good results. In addition, the results show that outdoor thermal comfort is significantly different with air temperature. Except for air temperature, both solar radiation and humidity play important roles on outdoor thermal comfort.

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