Exhaust temperature: refers to the outlet temperature of the compressed gas of the air compressor (the temperature cooled by the cooler)

Compression ratio:

1. Internal compression ratio (i.e. internal pressure ratio) The ratio of the final pressure (absolute pressure) and the starting pressure (absolute pressure) of the gas after internal compression. 2. External compression ratio (i.e. external pressure ratio) is the ratio of the outlet exhaust pressure (absolute pressure) of the compressor to the inlet suction pressure (absolute pressure). For screw air compressors, the internal compression ratio refers to the pressure ratio (absolute pressure) between the suction and exhaust ports of the screw main engine, and the external compression ratio refers to the pressure ratio (absolute pressure) between the suction and exhaust ports of the air compressor. .

Generally speaking, the compression ratio of an air compressor refers to the external compression ratio, the suction pressure refers to the local atmospheric pressure, and the exhaust pressure refers to the rated working pressure of the air compressor, such as Unitex Air The exhaust pressure of the press UD110-8 is 8bar, and the compression ratio is 9.

For multi-stage compressors, the pressure ratio is also called the total pressure ratio, which refers to the exhaust pressure measured at the last-stage exhaust pipe nozzle and the suction pressure measured at the first-stage air inlet nozzle. pressure ratio. The ratio of the nominal suction and exhaust pressures of corresponding stages is called the pressure ratio of the stage.