English
The underground environment of the parking lot is closed, the air circulation is poor, and the vehicles circulate frequently. Each car produces a certain amount of harmful gases during the start-stop process, which accumulate into a large amount and cannot be discharged naturally. The main harmful gas is CO. As a colorless and odorless toxic gas, CO is difficult to detect. Once inhaled excessively, it will cause poisoning and even threaten life. If the gas concentration is too high, it will cause fire and explosion.
Underground parking lots The main source of carbon monoxide is when the car engine is idling, gasoline is not fully burned, resulting in exhaust containing a large amount of CO gas. The maximum short-term concentration of CO allowed in an enclosed space is 150 ppm.
Produced by diesel engines; causes respiratory problems. The maximum allowable short-term concentration of NO2 is 15 ppm.
Produced by natural gas-powered cars.
Most of the modern cars still have internal combustion engines that run on petrol or diesel fuel. The products of internal combustion are toxic gases that accumulate in enclosed spaces such as underground car parks. Essential requirement of the safety system for underground parkings and garages is hazardous gases monitoring and ventilation. Acceptable gas concentration levels are established by local regulatory agencies and codes.
In order to ensure safety, a gas detection system is essential. When the concentration of toxic and harmful gases reaches the warning value, the gas detector activates the alarm and uploads the alarm data to the controller. The controller receives the alarm signal, activates the sound and light alarm, and links the fan and other equipment to quickly discharge the harmful gas; at the same time, the alarm data is uploaded to the monitoring center via wired/wireless transmission. Management personnel can receive danger warning messages sent by the supervision center in time, mobilize in time, and nip safety accidents in the bud. The harmful gas monitoring system in the underground garage needs to be comprehensively considered based on the on-site network situation, parking space distribution, fan installation location, overall garage layout, on-site wiring and other dimensions.
