Abstract: To study the design parameters of the exhaust air system for CO2 fire extinguishing in Taotan wine warehouse, according to the current national standards, the ventilation frequency, environmental wind speed, and exhaust parameters of the exhaust system after carbon dioxide fire extinguishing in a certain pottery wine cellar were calculated. The gas volume fraction distribution in the downwind direction after carbon dioxide emission was calculated using PHSAT software under three simulated operating conditions. According to the calculation results, when the air exchange rate of the wine cellar is 12 times/h, it is recommended that the wind speed of the exhaust outlet be 14.0 m/s, the exhaust outlet area be 0.13 m2, and the height of the exhaust outlet should be set at a distance of 2.1 m or more from the ground, with a minimum distance of not less than 6.4 m from key areas. The research results can provide effective data support for the design of exhaust systems after carbon dioxide fire extinguishing in wine warehouses, and provide reference for the rescue of wine warehouse fires.

Key words: wine cellar, fire extinguishing, PHAST, carbon dioxide, exhaust system