Abstract
The street thermal environment is important for thermal comfort, urban climate and pollutant dispersion. A 24-h vehicle traverse study was conducted over the Kowloon Peninsula of Hong Kong in summer, with each measurement period consisting of 2–3 full days. The data covered a total of 158 loops in 198 h along the route on sunny days. The measured data were averaged by three methods (direct average, FFT filter and interpolated by the piecewise cubic Hermite interpolation). The average street air temperatures were found to be 1–3 °C higher than those recorded at nearby fixed weather stations. The street warming phenomenon observed in the study has substantial implications as usually urban heat island (UHI) intensity is estimated from measurement at fixed weather stations, and therefore the UHI intensity in the built areas of the city may have been underestimated. This significant difference is of interest for studies on outdoor air temperature, thermal comfort, urban environment and pollutant dispersion. The differences were simulated by an improved one-dimensional temperature model (ZERO-CAT) using different urban morphology parameters. The model can correct the underestimation of street air temperature. Further sensitivity studies show that the building arrangement in the daytime and nighttime plays different roles for air temperature in the street. City designers can choose different parameters based on their purpose.
Highlights
Streets are where life, traffic, and commercial activities mingle together in large cities.Streets represent the immediate thermal environment for buildings, and the heat, moisture, wind, and so on emitted from buildings change the environment in the street
To avoid noise in the measurement, we can extract the main characteristics of the street temperature through the Fast Fourier measurement, we can extract the main characteristics of the street temperature through the Fast transformation (FFT) method (Method 2)
A 24-h vehicle traverse study was conducted over the Kowloon Peninsula of Hong Kong in summer, with each measurement period consisting of 2–3 full days
Summary
Traffic, and commercial activities mingle together in large cities.Streets represent the immediate thermal environment for buildings, and the heat, moisture, wind, and so on emitted from buildings change the environment in the street. Traffic, and commercial activities mingle together in large cities. The street thermal environment determines the thermal comfort of citizens, especially important for outdoor workers [1,2,3]. As climate is warming globally, cities such as Hong Kong will experience greater stress. Accurate information about the street thermal environment is important for the analysis of urban climate and pollutant dispersion. Being high-rise and compact, Hong Kong has had an urban warming rate of 2 ◦ C over the last 100 years, which is much higher than the global warming rate of. The outdoor air temperature is a main factor to determine physiological equivalent temperature, which is important for evaluation of thermal comfort [5].
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