Ventilation design optimization of new deep well vertical garages

In view of the characteristics of unmanned driving vehicles and no pollutant emission of deep well vertical garages compared with ordinary garages, a new ventilation design principle suitable for deep well vertical garages is explored to meet the requirements of safe ventilation. Firstly, two ventilation design principles (CO release from conventional garages and non-fire accident maintenance ventilation of deep well vertical garages) and their judgement criteria are put forward. Then, taking a deep well vertical garage as a prototype, the optimal ventilation air change rates under the two ventilation design principles are determined by numerical simulation, and the influence of fuel vehicle ratio on air change rates under the design principle of CO release from conventional garages is explored. The results show that with the CO release from conventional garages as the ventilation principle, when all the vehicles in the deep well vertical garage are fuel vehicles, the optimal ventilation air change rate of the garage is 3 h-1, and when the ventilation air change rate of the deep well vertical garage is 2, 1 and 0 h-1, the proportion of fuel vehicles in the garage is 70%, 50% and 40%, respectively. When the ventilation is based on the principle of non-fire accident maintenance ventilation, the optimal air change rate in the deep well vertical garage is 4 h-1.