THE EFFECT OF GEOMETRY AND SURFACE MATERIAL ON URBAN CANYON’S THERMAL ENVIRONMENT Case Study: Bandung City Corridor

• Main Author: Miftahul Firdausah, Azzahra
• Format: Theses
• Language: Indonesia
• Subjects: Arsitektur
• Online Access: https://digilib.itb.ac.id/gdl/view/36728
• Institution: Institut Teknologi Bandung

Characteristics of the urban canyon (UC) as one of the hot island formers identified in Bandung trade area. The city of Bandung, Indonesia is classified as a tropical monsoon in a tropical climate with an average annual temperature of 23.8°C and can rise to 29.8°C in the summer. The tropical region with the intensity of the solar throughout the year further decreases the quality of the urban's thermal environment. The orientation of an UC to the solar affects the amount of heat received by the UC. Mitigation potential through modification of physical characters; geometry (H/W) and SVF that can reduce the heat received by the UC surface so as to improve the quality of the thermal environment. The combination of the surface material thermal properties preference that can reduce material temperature and air temperature has the potential to improve thermal environmental conditions. This research focuses on thermal environmental conditions and physical modification of UC, resulting in the formulation of research problems as follows; (1) How UC thermal conditions of AY with H/W = 0.4-0.5, OID with H/W 1.50-1.94, DK with H/W = 0.81-1, and BG with H/W = 1.09- 1.90 and which UC has the highest air temperature to be modified? (2) What factors influence the temperature of UC air so that it can be used for modification UC? (3) What is the most effective geometry among the four UC in Bandung in providing shade and reducing heat input into UC (4) What type and thermal properties of road and sidewalk materials in reducing heat input to the UC surface. Quantitative methods are used to collect existing climatology data in the field and simulation results. There are four processes (stages) of data analysis carried out in this study; field measurements, existing simulation, multivariate regression analysis, and modification simulations. The data analyzed for conclusions are the simulation results of Envi-met for 24 hours. The findings at the existing UC show that in the fourth UC city of Bandung it is not yet in a comfortable thermal condition. UC corridor AY with the northeast-southwest orientation as UC with the highest air temperature, making the thermal conditions worse. Solar radiation plays an important role in the accumulation of air temperature and surface material. Geometry is the main factor that influences the quality of a UC. This is related to the ability of UC's physical form to provide imagery on its surface. The smaller the shadow, the more heat from the radiation absorbed, which increases surface temperature and air temperature. The movement of air inside the UC is not only influenced by geometry, but also by the direction of the wind. Material temperature has been shown to affect air temperature mostly due to the impact of the H / W ratio. Of all climate variables and UC physical variables, only three factors influence the air temperature of a UC. The three biggest factors to small effect are the UC surface temperature, the H / W ratio, ie the UC height value divided by the UC width and SVF or Sky View Factor is the ratio of UC received basic radiation to the measurement point. Material with a large heat capacity can absorb heat but release at night triggers the potential for the formation of a hot island. There are no road or pavement materials that are ideal for improving thermal quality. Conclusion, the greater the H/W ratio, the lower the air temperature and UC surface temperature. UC AY from H / W = 0.5 to 1 can reduce UC air temperature by 1,46 ° C. The material temperature ratio of 0.5 to 1.5 decreased by 2.06 ° C.