Ventilation and air conditioning system design for Baihetan Hydropower Station

The layout of caverns in the underground powerhouse of Baihetan Hydropower Station is complex, the air flow in the caverns is staggered and connected, and there are many electrical equipment in the plant with high calorific value, so the design of ventilation and air conditioning system is particularly important. The ventilation and air conditioning design scheme of the underground powerhouse with mechanical ventilation as the main part and air conditioning and dehumidification as the auxiliary part is confirmed. The air distribution of the underground powerhouse with “four in and five out” is proposed. Combined with the plant layout, the calorific value of electrical equipment and the division of ventilation and air conditioning system, the design scheme and air distribution of ventilation and air conditioning system in each area are improved. The ventilation rate and equipment layout of ventilation and air conditioning system in each area are analysed, and the operation scheme of adjusting fans and air conditioning units according to season is put forward. The ventilation and air conditioning system can meet the temperature, humidity and ventilation requirements of the underground powerhouse.