Research on a technology of reducing energy consumption of circulating water pumps in four-pipe air conditioning systems

Aiming at the four-pipe air conditioning system, this paper presents a technology to reduce the energy consumption of circulating water pumps. Only analysing summer operation conditions, the hot water supply and return pipes that do not work in summer in the four-pipe air conditioning system is taken as the chilled water loop of the air conditioning system by using the bypass pipe added in the water supply and return mains of the cold and hot manifold. Part of the cold water supply to the end hot coil is taken as the first stage cooling section（surface air cooler 1）, and the end cold coil is taken as the second stage cooling section（surface air cooler 2）. The influence of the technical scheme on the system resistance and pump lift is analysed. The results show that the technical scheme changes the hydraulic characteristics of the original air conditioning pipe network, reduces the flow rate of the pipe network, saves the energy consumption of the chilled water pump, and realizes the purpose of energy saving.