scholarly journals EFFECTS OF VARIOUS RELAXATION METHODS FOR THE HEAT ISLAND PHENOMENON ON OUTDOOR THERMAL ENVIRONMENT IN THE PRESENT URBAN BLOCKS USING NUMERICAL SIMULATIONS

2008 ◽  
Vol 73 (630) ◽  
pp. 1021-1027 ◽  
Author(s):  
Takashi TSUCHIYA ◽  
Ryozo OOKA ◽  
Hong CHEN ◽  
Hong HUANG
Keyword(s):  
Numerical Simulations ◽  
Thermal Environment ◽  
Heat Island ◽  
Relaxation Methods ◽  
Outdoor Thermal Environment

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.

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.

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>

Green Roof as a Green Material of Building in Mitigating Heat Island Effect in Taipei City

2012 ◽  
Vol 193-194 ◽  
pp. 368-371 ◽  
Author(s):  
Chen Yi Sun ◽  
Yi Jiung Lin ◽  
Wen Pei Sung ◽  
Wen Sheng Ou ◽  
Kang Ming Lu
Keyword(s):  
Green Space ◽  
Thermal Environment ◽  
Green Roof ◽  
Office Building ◽  
Heat Island ◽  
Environmental Benefit ◽  
Island Effect ◽  
Taipei City ◽  
Thermal Influence ◽  
Maximum Cool

A large amount of research has been published in Taiwan on the reduction of the urban temperature for different strategies. The most important strategy for reducing ambient temperature is increasing green space in city. For analyzing the effect of the vegetation on the thermal environment, this paper collects temperature data from one green roof and one normal roof which are belong to a same office building to analyze the thermal influence of vegetation. The result of this research shows that in summer the maximum cool effect of green roof was -1.60 oC and -0.26 oC in average. Therefore, it can also provide useful data to governments for calculating the environmental benefit if they carry out a green roof policy in mitigating heat island effect in the future.

scholarly journals The Thermal Performance of Traditional Residential Buildings in Kathmandu Valley

2014 ◽  
Vol 10 (1) ◽  
pp. 172-183 ◽  
Author(s):  
Sushil B. Bajracharya
Keyword(s):  
Thermal Performance ◽  
Field Data ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Residential Building ◽  
Kathmandu Valley ◽  
Indoor Thermal Environment ◽  
Outdoor Thermal Environment ◽  
Different Seasons ◽  
Better Than

This paper seeks to investigate into the aspects of thermal performance of traditional residential buildings in traditional settlements of Kathmandu valley. This study proceeds to analyze the detailed field data collected, with a view to identify the indoor thermal environment with respect to outdoor thermal environment in different seasons. This paper also compares the thermal performance of traditional buildings with modern residential buildings of traditional settlements of the valley. There is a regression analysis to obtain information about the thermal environment of different traditional and modern residential buildings with different conditions. The paper concludes that, thermal performance of traditional residential building, adapted in various ways to the changing thermal regime for thermal comfort is better than that of contemporary buildings.DOI: http://dx.doi.org/10.3126/jie.v10i1.10898Journal of the Institute of Engineering, Vol. 10, No. 1, 2014,  pp. 172–183

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