Simulation and optimization analysis of toilet exhaust in public buildings

Effectively removing pollutants from toilets is the key to toilet exhaust. Taking the toilet of a public building as an example, this paper analyses the ammonia concentration in the toilet through numerical simulation, and optimizes the setting position, size and exhaust air volume of the exhaust outlet. The results show that the toilet exhaust outlet should be arranged close to the pollution source. When the lower exhaust outlet is set at the height of 0.3 m, the ammonia concentration in the breathing height areas of the toilet is nearly 80% lower than that of the top exhaust mode of the room. When the lower and top exhaust are used simultaneously in the toilet and the air volume ratio is 9∶1, the ammonia concentration in the room is the lowest. When the optimized exhaust mode is adopted and the ventilation rate reaches more than 10 times per hour, the toilet could obtain an ideal exhaust effect.