International Journal of Advances in Science, Engineering and Technology(IJASEAT)
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Volume-7,Issue-2, Spl. Iss-2  ( Jun, 2019 )
Statistics report
Aug
Submitted Papers : 80
Accepted Papers : 10
Rejected Papers : 70
Acc. Perc : 12%
  Journal Paper

Paper Title
Surveying the Thermal Properties of an Urban Heat Island Vertical Structure Influenced by Subtropical Solar Radiation

Abstract
Man-made structures and paved surfaces in urbanized areas create a situation where heat from solar radiation does not readily dissipate and instead accumulates, causing the urban heat island effect. Much past research has investigated how features of the earth’s surface play a role in the urban heat island effect, yet most of this research focuses only on the surface of the urban area. This study analyses collected data for climatic factors and visualized data of an urban vertical structure in order to explore the relationship between thermal energy distribution in a subtropical urban vertical environment and environmental factors. In order to understand the flow and location of thermal energy in an urban vertical environment and influencing factors, this study uses a remote-controlled drone Phantom 4 Pro to measure an urban thermal environment’s vertical space structure. It then creates distribution figures for temperature, humidity, and enthalpy of an urban thermal environment’s vertical structure. The research results indicate that parameter distribution for the two profiles of an urban vertical structure and the earth’s surface properties are closely related. Apart from human influences, the main source for an urban heat island is an increase in thermal capacity. Vegetation can mitigate enthalpy of dry air yet is unable to effectively reduce enthalpy of moist air. Home to a subtropical climate with high humidity, Taiwan must consider issues related to latent heat, as the enthalpy of moist air impacts the comfort of those who live on the island. How much urban wind fields can mitigate an urban heat island depends on topography, the area’s size, buildings, and vegetation. Heat in urban areas caused by a heat island can be driven out with ventilation from wind power and thermal buoyancy. Improved remote sensing technology has allowed us to garner more precise measurement data, and, in the future, we will be able to predict urban heat island heat distribution flow and influencing factors, which will be the basis for methods dealing with heat dissipation in an urban climate’s vertical space. Index Terms - Urban heat island, thermal capacity, enthalpy, temperature gradient, air convection


Author - Hsin-Hua Tsai, Chih-Hong Huang

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