The air containing water vapor is called humid air. The air in nature is essentially moist air, but the humidity is different. From the nature of the moist air, it is known that at the same temperature and pressure, the density of the moist air is lower than the density of the dry air, and the higher the humidity, the lower the density. The coefficient that takes into account air humidity to reduce the displacement of the compressor is called the humidity coefficient.

The actual duty cycle of a vane compressor is affected by factors such as gap volume, suction and exhaust resistance, intake temperature, air leak and air humidity. In addition to the air gap volume, all other factors increase the circulation function of the air compressor, and all factors reduce the amount of exhaust gas. Their effect on displacement can be expressed by the exhaust coefficient.

In addition, during the operation of the vane compressor, there is always a temperature difference between the gas and the cylinder wall. Therefore, the gas absorbs heat from the high temperature cylinder wall at the initial stage of compression, and becomes an endothermic compression. After the air is compressed to a certain extent, heat is released to the cylinder wall and becomes exothermic compression. Therefore, during compression, the variable index is a variable.


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