Limited by multiple factors, such as land use planning, landscape coordination and environmental standards, the ventilation conditions of urban highway tunnels are insufficient, therefore joint control purification becomes a necessary solution. In this study, effect number, location decentralized equipment, tunnel rate on pollution in studied using one-dimensional calculation. The results show ...

The paper presents the aerodynamic performance of an axial reversible fan for high air temperatures, obtained by applying similarity theory and numerical flow simulations. This analysis was performed possibility installing existing structure impeller a in jet longitudinal ventilation tunnel. direction forced tunnels changes, it is always towards low atmospheric pressure, i.e. natural flow. Thes...

Train-induced unsteady airflow (TIUA) has a great effect on the ventilation and thermal environment of subway line. Track area, connecting tunnel with station, is source TIUA acting station. Exploring characteristics track area contributes to utilizing for improving station environment. In this study, 1D numerical model according an actual line was established by IDA Tunnel software, analyse ra...

Experience from occurrences of fires in road tunnels shows that victims are usually found within a few hundred metres of the scene of the incident. The fatal consequences of a fire in a tunnel measuring only a few hundred metres can be comparable to those resulting from a fire in a long tunnel. In tunnels with considerable slope the hazard for tunnel users increases due to rapid smoke dispersio...

article utilizes CFD software to investigate the smoke control system of the safety reliability for the underground Mass Rapid Transit (MRT) system. The purpose of this research is to simulate the fire occurring in the tunnel region where the smoke control system designs are corresponding to the National Federation of Paralegal Associations 130 (NFPA130). The smoke control mode of the tunnel in...

We used flow-switching type differential mobility particle sizer in a diameter range of 6–1000 nm and vehicle counting detectors with a time resolution of 10 min for 15 days in July 2010 in the Castle District Tunnel, Budapest. The total particle number concentrations varied from 5.1 ¥ 103 to 465 ¥ 103 cm–3 with a median of 143 ¥ 103 cm–3. The median was greater by a factor of 12 than that for ...

The data presented in this article were the basis for the study reported in the research articles entitled 'Climate responsive behaviour heat pipe technology for enhanced passive airside cooling' by Chaudhry and Hughes [10] which presents the passive airside cooling capability of heat pipes in response to gradually varying external temperatures and related to the research article "CFD and wind ...