Energy Saving Optimization Control for Air-Conditioning System Considering Precision Motor Losses Characteristics and Thermal Comfort

Abstract

Existing optimal control of central air conditioning is difficult to improve the control performance of central air conditioning due to the negative impact of model errors. This study establishes an energy flow model of central air conditioning system considering the detailed loss characteristics of variable frequency motor and analyzes the influence of model accuracy on individual optimization behavior. Then, this study optimizes input number of subsystems, water supply temperature and water supply temperature difference simultaneously to reduce the adjustment time required for cooling. Finally, the temperature difference between indoor air temperature and end outlet temperature of the water system in the air conditioning unit is optimized to meet thermal comfort requirements. The optimization results show that the proposed method saves 16.1%-23.9% of energy compared with traditional model and conventional optimization method. The proposed strategy can provide a reference for energy conservation of the central air-conditioning system in large buildings.

Keywords: Inverter air-conditioners, energy conservation, System optimal control, Motor loss, Large public buildings, Power consumption