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G. Ding
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Numerical method for shape optimization of standard floor of the high-rise buildings in hot-summer and cold-winter areas under the low energy consumption target—taking the L-shape as an example X.Y. Ying; W.Z. Li; Q. Kan; Z. Zhang; G. Ding
Lowland Technology International Vol 20 No 1, June (2018)
Publisher : International Association of Lowland Technology

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Abstract

Shape is an important consideration in building design due to its significant impact on building performance in energy consumption. This paper presents a methodology to program planes using MATLAB language. Three side length factors were proposed as the design variables for L-shaped layouts, and eighteen kinds of L-shaped layouts were generated by changing those variables individually. An energy consumption simulation software (DesignBuilder) was developed to simulate the energy consumption of these layouts of high-rise buildings as experimental models. The correlativity between the width ratio and depth ratio of all experimental models and their energy consumption was examined when deriving the corresponding polynomial function. The main finding of the study suggested that there were certain critical points for both width ratio and depth ratio of the standard floor of high-rise buildings with Lshaped plane, which was 0.4 for width ratio and 0.67 for depth ratio. The energy consumption increased rapidly beyond the critical point, and there was a slight fluctuation at another interval. Further, this paper provided a range of side length ratio in contour plots which showed the variation of energy consumption of L-shape high-rise buildings with width ratio and depth ratio under the weather condition in Hangzhou, China.
The form of street spatial layout based on a wind environmental perspective X.Y. Ying; Q. Kan; G. Ding
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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With China's rapid urbanization, the construction of central areas in city with numerous buildings and dense population has greatly changed the microclimate. Different street spatial layouts change the internal wind environment, which affect the pedestrian comfort. Computational fluid dynamics (CFD) models are used to study the correlation between the three-main street spatial layout factors, which are near-line rate, street interface density and street aspect ratio, under the simulation of relevant weather conditions. Firstly, the wind speed within the street change with the increase of the near-line rate like a parabola trend, and the wind speed reaches its peak about at a near-line rate of 70%. In that case, it’s conducive to ventilation. Secondly, with the reduction of street interface density the variation of the wind speed of each measuring point in the streets is getting bigger and bigger, and the pedestrian walking in them will feel the change of wind speed which makes the comfort of pedestrian decrease. Thirdly, the average wind speed in urban streets is inversely proportional to the street aspect ratio. These conclusions will provide an important reference and evaluation basis for urban designers at the beginning of design and effectively avoid future wind environment problems.
Co-Authors Q. Kan W.Z. Li X.Y. Ying Z. Zhang