Anthropogenic Vehicular Heat and Its Influence on Urban Planning

Anthropogenic heat (QF) is one of the parameters that contributes to the urban heat island (UHI) phenomenon. Usually, this variable is studied holistically, among other anthropogenic flux such as industrial, vehicular, buildings, and human metabolism, due to the complexity of data collection through field measurements. The aim of this paper was to weigh vehicular anthropogenic heat and its impact on the thermal profile of an urban canyon. A total of 108 simulations were carried out, using the ANSYS Fluent (R) software, incorporating variables such as the number of vehicles, wind speed, urban canyon orientation, and urban canyon aspect ratio. The results were compared with a database of 61 American cities in 2015 and showed that orientation is the main factor of alteration in vehicular heat flow, increasing it in a range of 2 degrees C to 6.5 degrees C, followed by the wind speed (1.2 to 2.2 m/s), which allows for decreases of 1 to 3.8 degrees C. The exploration of these variables and their weighing in the definition of urban street canyon temperature profiles at the canopy level of urban structures provides valuable information on the hygrothermal comfort of its inhabitants; its appropriate quantification can be an example of many urban energy balances altering processes.

Automated summary

This study examines the impact of vehicular anthropogenic heat on the thermal profile of an urban canyon. The results show that the orientation of the canyon is the main factor influencing the heat flow, followed by wind speed.