Study on The Affect of Aspect Building Form and Layout

BETA PARAMITA HIROATSU FUKUDA

KITA KYUSHU UNIVERSITY　1-1 ひびきの若松区北九州市福岡県

Presented at :The 3rd International Conference on Sustainable Future for Human Security, Kyoto University ; 3-5 November 2012

Acknowledgement

Sustainable Use of Water and Resources (SUW) of Kitakyushu University to support the research

Indonesian DGHE (Direktorate General of Higher Education) for the scholarship,

Indonesia University of Education (UPI) where author work.

BACKGROUND

THIS PRESENTATION THEN, IS COMPARING TWO BUILDING GROUPS, WHICH HAVE A DIFFERENT BUILDING LAYOUT

(SIZE, SHAPE AND ORIENTATION) IN THE SAME NEIGHBORHOOD TO SEEK SITE MICROCLIMATE

THESE PHYSICAL ASPECTS INFLUENCE MEAN RADIANT TEMPERATURE AND

WIND SPEED THAT CORRELATE WITH THREE LEVELS OF THERMAL STRESS.

URBAN GEOMETRY CONFIGURES OPEN SPACE AND

CREATES A DISTINCT MICROCLIMATE

Method

The difference of building form and layout, particularly the ratio of

H/W will influence mean radiant temperature

ENVI-met is used to calculate the microclimate and air quality in

urban structure and open space

A comparison of Tmrt building group reveals that time and period of the day during which extreme heat stress occurs on August 7th , 2012 to provide a better building configuration.

A number of simulations are using ENVI-met BETA4, it revealed to be a good tool for the prognosis of the urban microclimate changes within urban areas, and also in the assessment of outdoor comfort through a satisfactory estimation of the mean radiant temperature

Microclimate Simulation

Study Area

building group 1 and 2

A. Yahatanishiku, kitakyushu shi, fukuoka

Study Area

B. Site Selection

building group 1 building group 2

The warm season lasts from June24th to September 21th

with an average daily high temperature above 26°C.

The hottest day of the year is August7th, with an average high of 30°C and low of 26°C

sunrise at 5.30am and sunset at 7.12pm, therefore this simulation conducted on August 7th between 6am – 7pm (13hours)

Meteorology Data

Kitakyushu Area : oceans and seas 41% forests 33% shrublands 15% croplands 6%, and built-up areas 3%.

Results Microclimate at street level

A. Air Temperature

building group 1 building group 2

Results

B. Wind Speed

building group 1 building group 2

Results

C. Mean Radiant Temperature

building group 1 building group 2

Analysis - Building Form and Layout

A1. Ta and Tmrt for as a result of building configuration (G1)

Ta (air temperature) Tmrt (mean radiant temperature)

Analysis - Building Form and Layout

A2. Ta and Tmrt for as a result of building configuration (G2)

Ta (air temperature) Tmrt (mean radiant temperature)

Analysis - Building Form and Layout

B. H/W Ratio for N-S and E-W orientation at 3pm

N-S of G1 Tmrt x-z cut at y=60 N-S of G2 Tmrt x-z cut at y=40

E-W of G1 Tmrt y-z cut at x=80 E-W of G2 Tmrt y-z cut at x=45

Resume of simulation

Both of Ta and Tmrt for G1 are lower than G2 on open space, street and shaded area

The higher building with vegetation around open space provides lower temperature, higher speed of wind, and will influence the mean radiant temperature, which could develop a better urban microclimate.

North orientation is potential to reduce high temperature since its wind direction. Provide active open space such as park, playground with proper vegetation, also proved to deliver the lowest air temperature and mean radiant temperature as well.

Conclusion

Thank you

Terima kasih

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