Calculation of Tunnel Ventilation in Shallow Subways

A review on available energy saving strategies for heating, ventilation and air conditioning in underground metro stations

“…When using this solution, the electricity consumption of the ventilation system was reduced by 10-20% in cooling seasons, compared to normal ventilation conditions. Similarly, in Nobosibirsk, Russia, Krasyuk [65] mentioned that the piston effect allowed effective ventilation of shallow stations without switching on fans when the outdoor air temperature was lower than 8ºC. The mechanical fresh air supply control using piston wind to reduce the energy consumption of the mechanical ventilation system is easy to implement and can bring reliable energy-saving benefits.…”

Review of Passive Strategies for Ventilation and Air-Conditioning Energy Saving in Underground Metro Stations

“…Under the proposed condition, electricity consumption of the VAC systems in cooling season could be declined by 10%-20% compared with the normal operation condition. Similarly, Krasyuk [17] calculated the tunnel fan capacity of shallow subways and revealed that the piston effect allowed effective ventilation of subways without switching on the fans at the outdoor air temperature lower than 8 ºC in Russia.…”

A Review of the Piston Effect in Subway Stations

“…By comprehensively considering factors such as traffic, grid density, and personnel area, Krasyuk put forward a method for calculating the tunnel fan capacity to confirm that the subway piston wind can be used as a part of the air-conditioning and ventilation air volume. The experimental data and calculated results suggested that the piston wind can actually reduce the air conditioning load [25]. To calculate the degree of influence of the air conditioning energy consumption of the piston wind, Deng et al proposed a practical simulation method that used the underground mixing coefficient to evaluate how the piston affected the thermal environment.…”