Research on automatic optimization control strategy for variable-speed water-cooled direct cooling air conditioning units

The ventilation and air conditioning systems in the subway stations need to consume huge amount of electricity to maintain a comfortable internal environment, and how to reduce their energy consumption has become a critical issue. This paper proposes an automatic optimization control strategy for variable-speed water-cooled direct cooling air conditioning units by optimizing the frequency of the variable-speed compressor and fan, and maximizes the energy efficiency ratio (EER) of the units under the premise of meeting different load demand and air supply temperature range, so that the units operate at the lowest power consumption. The simulation results show that compared with the control strategy of fixed supply air temperature, the EER of the air conditioning unit can be improved by 6.9% after adopting the automatic optimization control strategy.