Improving the efficiency of microclimate creation systems

The work is devoted to the study of the efficiency of the condenser unit of a refrigeration machine using frequency converters to regulate the rotation speed of fans. The research is aimed at increasing the energy efficiency of the system by optimizing the operating modes of the fans and maintaining a stable temperature of the refrigerant at the outlet of the condenser. The simulation demonstrates that the operation of one fan at the maximum frequency can be comparable in terms of efficiency with the operation of several fans at lower speeds. This result indicates the possibility of reducing energy consumption when using frequency converters to regulate fan operation. The article discusses the principle of operation of an autonomous voltage inverter used to generate a sinusoidal output signal, as well as the implementation features of vector pulse width modulation. The key stages of modeling are described – the formation of control signals, the calculation of time intervals for switching motor windings and the transformation of coordinates from a three-phase system to a two-phase coordinate system α and β. The structure of the sector shaper blocks and the spatial stress vector obtained as a result of the simulation are presented. The simulation results have shown the effectiveness of the proposed methods to increase the quality of the output voltage and improve the performance of ventilation systems. The study is of practical importance for the design and modernization of fan control systems for condensers in refrigeration units, contributing to lower energy consumption and increased equipment reliability. The article was written on the basis of the Center for High Technologies of the Belgorod State Technological University named after V.G. Shukhov.