For users who purchase industrial refrigerators for the first time, there will be a small problem. At this time, these principles of selection need to be understood clearly. The selection of industrial refrigeration unit shall be determined based on the use, refrigeration capacity, local power supply, water source, heat source, gas source and other conditions through comprehensive technical and economic comparison of investment, operation cost, energy consumption, environmental impact and other factors. In areas with sufficient power supply, the industrial refrigeration unit driven by the shop should be preferred, generally according to the following principles.