Affiliation:
1. School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd., Shanghai 200093, China
Abstract
Source location identification methods are typically applied to steady-state conditions under pure indoor or outdoor environments, but under time-varying wind conditions and coupled indoor and outdoor environments, the applicability is not clear. In this study, we proposed an improved adjoint probability method to identify the pollutant source location with time-varying inflows in street canyons and used scaled outdoor experiment data to verify the accuracy. The change in inflow velocity will affect the airflow structure inside the street canyons. Outdoor wind with a lower temperature will exchange heat with the air with a higher temperature inside the street canyon, taking away part of the heat and reducing the heat of the air inside the street canyons. Moreover, the room opening will produce some air disturbance, which is conducive to the heat exchange between the air near the opening and the outdoor wind. Furthermore, the fluctuations of the upper wind will influence the diffusion of the tracer gas. We conducted three cases to verify the accuracy of the source identification method. The results showed that the conditioned adjoint location probability (CALP) of each case was 0.06, 0.32, and 0.28. It implies that with limited pollutant information, the improved adjoint probability method can successfully identify the source location in the dynamic wind environments under coupled indoor and outdoor conditions.
Funder
National Natural Science Foundation of China
Shanghai Sailing Program
Chen Guang project
Shanghai Municipal Education Commission
Shanghai Education Development Foundation
Subject
Building and Construction,Civil and Structural Engineering,Architecture
Reference50 articles.
1. Zhou, Z., Wang, P., Deng, J., Ouyang, C., Xu, Y., Jiang, W., and Ma, K. (2023). Numerical simulation of street canyon morphology and microclimate in hot summer and cold winter zone. Buildings, 13.
2. Impact factors on airflow and pollutant dispersion in urban street canyons and comprehensive simulations: A review;Zhang;Curr. Pollut. Rep.,2020
3. Effect of window geometry on wind driven single sided ventilation through opening;Albuquerque;Energy Build.,2021
4. Wind tunnel experiment of wind-induced single-sided ventilation under generic shelter urban area;Jiang;Build. Environ.,2023
5. Inter-room pollutant transmission routes in naturally ventilated street canyon buildings;Mohammadi;J. Build. Eng.,2023