Strömungstechnisches und thermodynamisches Verhalten von Seitenkanalverdichtern im Vakuumbereich

Because of the lower gas density side channel compressors perform in vacuum operation better fluidic performace than in pressure operation for generating overpressure. The thermal load of the compressors is reduced by the lower final compression temperature. The polytropic expansion of the lower mass flow in the breaker, which removes thermal energy both from the expanding gas and from the housing and therefore causing a cooling of the compressor, contributes especially to the varied thermodynamic performance in vacuum operation. This inner thermodynamic performance of the compressor in the breaker area and the suction area provides together with the lower power absorption an advantageous performance of side channel compressors in vacuum operation at absolute pressures p _S=10 to 40 kPa. These advantages in operation and thermodynamic advantages are as bigger as higher the vacuum and as lower the gas density get. From this a promising development of side channel compressors as vacuum pumps also in a higher vacuum region can be deduced.