Simulation Test of Bolting-Mesh Support Used in Coal Roadways

The variable voltage-variable frequency (VVVF) technology, the usage of VVVF inverter and its features are described. The principle of energy saving and control of VVVF applied in air condition system is also discussed. Compared with the valve control, the effect of energy saving of VVVF is analyzed, and the approximate calculation method is given. Finally, to take a pump used in air condition system for example, the effect of energy saving of valve control is compared to that one of VVVF control. The results indicate that the rate of energy saving can be 74.1% in air condition system of a large commercial building with VVVF inverter. This fact proves that the application of VVVF to air condition system is necessary and available.